Union-wide
Inter- and Transdisciplinary Sessions
Disciplinary sessions AS–GM
Disciplinary sessions GMPV–TS

Session programme

NH

NH – Natural Hazards

Programme group chair: Ira Didenkulova

DM14

Public information:
The NH division business meeting is the place for our community to discuss matters related to EGU's Division. During the meeting we will present and discuss:

1. Approval of the Agenda
2. Sharing Geoscience Online
3. President and Division President Elections 2019
4. NH Division Science Officers (2019/20 and 2020/21)
5. Awarding of 2020 OECS and OSPP from EGU 2019
6. 2020 MEDALS & Nominations Call for 2021
7. EGU & NH Meetings
8. EGU & NH Statistics
9. NHESS and NHESSD
10. Call for Programme for EGU 2020
11. Natural hazards ECS Team
12. Communication activities
13. Code of conduct
14. Other GA activities
15. EGU Governance Review
16. Other business

Please send any questions/comments/further suggestions to nh@egu.eu

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Convener: Ira Didenkulova
Tue, 05 May, 12:45–13:45 (CEST)

NH1 – Hydro-Meteorological Hazards

Programme group scientific officer: Antonio Parodi

NH1.1

Predicting current and future flood risk continues to be a major challenge for climatologists, hydrologists and hydraulicians. The complex nature of flood risk challenges established risk assessment methodologies and their modelling components, such as hydrologic and hydraulic simulation. Further, flood risk assessment is characterised by considerable uncertainty, which needs to be evaluated and clearly communicated to decision-makers.
This session aims to review state-of-the-art flood hazard, damage, and risk assessment methodologies on different scales from the building scale to the global level, as well as experiences of recent flood events, the physical processes occurring during flood flows, and uncertainties in measurement data and modelling. We welcome submissions in the areas of flood plain and urban risk assessment and uncertainty analysis, flood management including new approaches to hydraulic modelling, model calibration and validation and flood damage estimation.
Also, we are interested in contributions that show what kind of information is particularly helpful for reducing uncertainty, as well as measures for flood mitigation and the cost effectiveness of these measures. Abstracts are sought from those involved in both the theoretical and practical aspects related to these topics.

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Convener: Giuseppe Tito Aronica | Co-conveners: Heiko Apel, Viet Dung Nguyen, Guy J.-P. Schumann
Displays
| Attendance Wed, 06 May, 08:30–10:15 (CEST)
NH1.2

Worldwide, the frequency and magnitude of extreme flooding are steadily increasing, causing considerable losses of life and property. It hampers well-being and economic growth in many countries, so that flood forecasting and flood risk assessment have become of upmost importance. New and rapidly developing techniques are becoming widespread, such as unmanned aerial vehicles (UAV), synthetic-aperture radar (SAR) or satellite-based systems. Combined with fit-for-purpose hydrodynamic models, these techniques pave the way for breakthroughs in flood assessment and flood risk management. This provides a unique platform for the scientific community to explore the driving mechanisms of flood risk and to build up efficient strategies for flood mitigation and enhancing flood resilience.
This session invites presentations on research based on high-resolution aerial and satellite techniques like UAV, SAR, Altimeter, SCATSAT-1, etc. for flood monitoring, including mapping of inundation extent, flow depths, velocity fields, flood-induced morphodynamics, debris transport. It also invites the presentation of innovative modelling techniques of flood hydrodynamics, flood hazard, damage and risk assessment, as well as flood relief prioritization, dam and dike(levees) break floods, and flood mitigation strategies. Studies dealing with the modelling uncertainties and modern techniques for model calibration and validation are particularly welcome.
Furthermore, real-time flood inundation mapping is critical aspect for the evacuation of people from low-lying areas and to reduce casualties. Acquisition of real-time data gained through UAV-based flood inundation mapping and modelling, as well as assessment of uncertainties in real-time aerial surveying are welcome in this session.

Invited speaker:
Frederik Kratzert.
Mr Kratzert holds a MSc in environmental engineering with focus on hydrology and is now doing a PhD in Machine Learning at the Johannes Kepler University, Linz, Austria under the supervision of Sepp Hochreiter. His research is focused around the use of the LSTM neural network for hydrological/environmental modeling and his PhD is funded by Google AI.

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Co-organized by HS13
Convener: Dhruvesh Patel | Co-conveners: Cristina Prieto, Benjamin Dewals, Dawei Han
Displays
| Attendance Mon, 04 May, 08:30–10:15 (CEST)
NH1.3

Lightning is the energetic manifestation of electrical breakdown, occurring after charge separation processes operating on micro and macro-scales, leading to strong electric fields within thunderstorms. Lightning is associated with severe weather, torrential rains and flash floods. It has significant effects on various atmospheric layers and drives the fair-weather electric field. It is a strong indicator of convective processes on regional and global scales, potentially associated with climate change. Thunderstorms and lightning are also associated to the production of energetic radiation up to tens of MeV on time scales from sub-millisecond (Terrestrial Gamma-ray Flashes) to tens of seconds (gamma-ray glows).

This session seeks contributions from research in atmospheric electricity on:

Atmospheric electricity in fair weather and the global electrical circuit
Atmospheric chemical effects of lightning and Lightning-produced NOx
Middle atmospheric Transient Luminous Events
Energetic radiation from thunderstorms and lightning
Remote sensing of lightning from space and by lightning detection networks
Results from the Atmosphere-Space Interaction Monitor (ASIM) mission.
Thunderstorms, flash floods and severe weather
Lightning and electrical phenomena on other planets
Lightning, tropical storms and climate
Modeling of thunderstorms and lightning
Now-casting and forecasting of thunderstorms
Laboratory investigation of lightning discharge physics processes

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Co-organized by AS1
Convener: Yoav Yair | Co-conveners: Sonja BehnkeECSECS, Martino Marisaldi, Keri NicollECSECS, Serge Soula
Displays
| Attendance Tue, 05 May, 08:30–12:30 (CEST), Attendance Tue, 05 May, 14:00–15:45 (CEST)
NH1.4

In many parts of the world, weather represents one of the major uncertainties affecting performance and management of agricultural systems. Due to global climate changes the climatic variability and the occurrence of extreme weather events is likely to increase leading to substantial increase in agricultural risk and destabilisation of farm incomes. This issue is not only important for farm managers but also for policy makers, since income stabilisation in agriculture is frequently considered as a governmental task.

The aim of this session is to discuss the state of the art research in the area of analysis and management of weather-related risks in agriculture. Both structural and non-structural measures can be used to reduce the impact of climate variability including extreme weather on crop production. While the structural measures include strategies such as irrigation, water harvesting, windbreaks etc., the non-structural measures include the use of the medium-range weather forecast and crop insurance.

The topic is at the borderline of different disciplines, in particular agricultural and financial economics, meteorology, modelling and agronomy. Thus, the session offers a platform to exchange ideas and views on weather-related risks across these disciplines with the focus on quantifying the impact of extreme weather on agricultural production including impacts of climate change, analysis of financial instruments that allow reducing or sharing weather-related risks, evaluation of risk management strategies on the farm level, development of the theory of risk management and to exchange practical experiences with the different types of weather insurance.

This session has been promoted by:
• Natural hazard Early career scientists Team (NhET, https://blogs.egu.eu/divisions/nh/tag/early-career-scientists/)
• Boosting Agricultural Insurance based on Earth Observation data (BEACON, https://beacon-h2020.com/)
• Research Center for the Management of Agriculutral and Environmental Risks (CEIGRAM, http://www.ceigram.upm.es/ingles/)

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Co-organized by SSS9
Convener: Ana Maria Tarquis | Co-conveners: Anne Gobin, Stefanos Mystakidis, Jonathan RizziECSECS, Wenwu Zhao, Luigi Lombardo
Displays
| Attendance Thu, 07 May, 08:30–10:15 (CEST)
NH1.5

Severe hydro-meteorological phenomena (i.e. extreme weather in terms of precipitation, heat waves and wind storms) on land and sea have a high impact globally as well as in European territories. The increasing frequency and severity of hydro-meteorological events such as hurricanes, intense cyclones, or destructive thunderstorms appear to be associated with climate change and an increasing number of people is exposed to climate-related hazards each year – particularly the most vulnerable. The science behind these phenomena is complex, but advancement in evidence-based knowledge, together with progress in technology and data-driven measurement systems, allow more detailed monitoring and forecasting capability to target interventions at the appropriate time-scale. The employment of nature-based solutions (NBS) to mitigate the impact of hydro-meteorological phenomena could be a viable approach requiring coordinated efforts.
The session intends to stimulate the international scientific community across several fields to demonstrate how nature-based solutions (NBSs) could contribute to disaster risk reduction in line with the EU Roadmap for achieving the goals of the Sendai Framework. It aims to promote and share experience with the best available science and knowledge to establish a coherent approach towards risk mitigation. Results from the EU H2020 projects NAIAD, OPERANDUM, PHUSICOS and RECONECT are encouraged as well as contributions discussing the main drivers and barriers for NBSs implementation . Also contributions documenting how NBS can be beneficial in land use planning, risk assessment, climate change impact, disaster prevention are welcome.
Specific topics are related to the following questions
- How can we mainstream the adoption of innovative, systemic and locally-attuned nature-based solutions for hydro-meteorological risk reduction at watershed/landscape scale? - What are the required features of comprehensive framework for comparing green and blue/grey/hybrid hydro-meteorological risk prevention and reduction solutions? - What is the evidence on the effectiveness of these solutions? How can we capture the potential (insurance) value of ecosystems?
Additional topics are
- Methods for NBS co-designing and co-development - Methods for the identification and assessment of barriers related to social and cultural acceptance and in regulatory frameworks that hinder the adoption of NBS.

Public information:
Dear Authors,

you are kindly invited to upload material by May 3, 2020. All accepted abstracts will be discussed. We reccommend 3-5 sharp slides with aim - methods - main results and conclusions. We are very excited to hear about your work and findings.
Best regards,
Silvana, Amy, Elena and Zoran

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Convener: Silvana Di Sabatino | Co-conveners: Elena Lopez-Gunn, Amy Oen, Zoran Vojinovic
Displays
| Attendance Mon, 04 May, 14:00–18:00 (CEST)
NH1.6

Today, it is almost certain that global climate change will affect the frequency and severity of extreme meteorological and hydrological events. It is necessary to develop models and methodologies for the better understanding, forecasting, hazard prevention of weather induced extreme events and assessment of disaster risk. This session considers extreme events that lead to disastrous hazards induced by severe weather and climate change. These can, e.g., be tropical or extratropical rain- and wind-storms, hail, tornadoes or lightning events, but also floods, long-lasting periods of drought, periods of extremely high or of extremely low temperatures, etc. Papers are sought which contribute to the understanding of their occurrence (conditions and meteorological development), to assessment of their risk and their future changes, to the ability of models to reproduce them and methods to forecast them or produce early warnings, to proactive planning focusing to damage prevention and damage reduction. Papers are also encouraged that look at complex extreme events produced by combinations of factors that are not extreme by themselves. The session serves as a forum for the interdisciplinary exchange of research approaches and results, involving meteorology, hydrology, hazard management and/or applications like insurance issues.

Public information:
NH1.6/AS1.5/HS13.10

Extreme meteorological and hydrological events induced by severe weather and climate change
Display presentations Monday, 04 May, 08:30–12:30

The presentation of Displays during the chat will be made in the following order:

Severe storms/precipitation (8:30-10:15): D1932, D1933, D1934, D1936, D1938, D1940, D1942, D1943, D1944, D1951, D1952, D1953, D1955, D1956, D1957, D1958, D1960, D1962, D1963 (not presented), D1964, D1965, D1966, D1967, D1969, D1974, D1977, D1982

Floods (10:45-11:05): D1935, D1937, D1939, D1941, D1954, D1959

Droughts and other extreme weather events (11:05-12:30): D1945, D1946, D1947, D1948, D1949, D1950, D1961, D1968 (not presented), D1970, D1971, D1972, D1973 (not presented), D1975, D1976, D1977, D1978, D1979, D1980, D1981, D1983, D1984, D1985

Information (video and text) how to use the chats could be found at https://egu2020.eu/sharing_geoscience_online/how_to_use_the_chats.html

The chairpersons will handle and organize the questions and replies of the presentations, following the above line of presentations. Each author is asked for an introduction (please prepare). Then, we will take questions.

Conveners, co-conveners, and chairpersons of the sessions reserve the right to ban participants showing abusive behaviour or violating EGU's Code of Conduct.

The conveners of the session
Athanasios Loukas
Maria Carmen Llasat
Uwe Ulbrich

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Co-organized by AS1/HS13
Convener: Athanasios Loukas | Co-conveners: Maria-Carmen Llasat, Uwe Ulbrich
Displays
| Attendance Mon, 04 May, 08:30–12:30 (CEST)
HS4.1

Heavy precipitation events in small and medium size catchments can trigger flash floods, which are characterized by very short response times and high specific peak discharges, and often occur in ungauged basins. Under appropriate geomorphological conditions, such rainstorms also cause debris flows or shallow landslides mobilizing large amounts of unconsolidated material. Although significant progress has been made in the management of these different hazards and related risks, they remain poorly understood and their predictability is affected by large uncertainties, due to the fast evolution of triggering rainfall events, the lack of appropriate observations, the high variabilities and non-linearities in the physical processes, and the high variability and complexity of societal vulnerability.

This session aims to illustrate current advances in monitoring, understanding, modelling, and forecasting flash floods and associated geomorphic processes, and documenting and anticipating the societal impacts and social responses.

Contributions on the following scientific themes are more specifically expected:
- Development of new measurement techniques adapted to flash floods monitoring (including remote sensing data, weather radar, and lightning), and quantification of the associated uncertainties,
- Identification of processes leading to flash flood events and/or rainfall-induced geomorphic hazards from data analysis and/or modelling, and of their characteristic space-time scales
- Possible evolutions in hazard characteristics and frequency related to climate change.
- Development of short-range (0-6h) rainfall forecasting techniques adapted to heavy precipitation events, and representation of associated uncertainties
- Development of hydro-meteorological forecasting chains for predicting flash floods and/or rainfall-induced geomorphic hazards in gauged and ungauged basins
- Development of inundation mapping approaches specifically designed for an integration in flash floods forecasting chains.
- Use of new criteria such as specific “hydrological signatures” for model and forecast evaluation
- Observation, understanding and prediction of the societal vulnerability and social responses to flash floods and/or associated hydro-geomorphic hazards.

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Co-organized by NH1
Convener: Olivier Payrastre | Co-conveners: Jonathan Gourley, Marcel Hürlimann, Pierre Javelle, Massimiliano Zappa
Displays
| Attendance Wed, 06 May, 16:15–18:00 (CEST)
HS3.1

Hydroinformatics has emerged over the last decades to become a recognised and established field of independent research within the hydrological sciences. Hydroinformatics is concerned with the development and hydrological application of mathematical modelling, information technology, systems science and computational intelligence tools. We also have to face the challenges of Big Data: large data sets, both in size and complexity. Methods and technologies for data handling, visualization and knowledge acquisition are more and more often referred to as Data Science.

The aim of this session is to provide an active forum in which to demonstrate and discuss the integration and appropriate application of emergent computational technologies in a hydrological modelling context. Topics of interest are expected to cover a broad spectrum of theoretical and practical activities that would be of interest to hydro-scientists and water-engineers. The main topics will address the following classes of methods and technologies:

* Predictive and analytical models based on the methods of statistics, computational intelligence, machine learning and data science: neural networks, fuzzy systems, genetic programming, cellular automata, chaos theory, etc.
* Methods for the analysis of complex data sets, including remote sensing data: principal and independent component analysis, time series analysis, information theory, etc.
* Specific concepts and methods of Big Data and Data Science
* Optimisation methods associated with heuristic search procedures: various types of genetic and evolutionary algorithms, randomised and adaptive search, etc.
* Applications of systems analysis and optimisation in water resources
* Hybrid modelling involving different types of models both process-based and data-driven, combination of models (multi-models), etc.
* Data assimilation and model reduction in integrated modelling
* Novel methods of analysing model uncertainty and sensitivity
* Software architectures for linking different types of models and data sources

Applications could belong to any area of hydrology or water resources: rainfall-runoff modelling, flow forecasting, sedimentation modelling, analysis of meteorological and hydrologic data sets, linkages between numerical weather prediction and hydrologic models, model calibration, model uncertainty, optimisation of water resources, etc.

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Co-organized by NH1/NP1
Convener: Dimitri Solomatine | Co-conveners: Ghada El Serafy, Amin Elshorbagy, Dawei Han, Adrian Pedrozo-Acuña
Displays
| Attendance Tue, 05 May, 08:30–12:30 (CEST)
HS7.1

The hydrological response to precipitation at the catchment scale is the result of the interplay between the space-time variability of precipitation, the catchment geomorphological / pedological / ecological characteristics and antecedent hydrological conditions. Therefore, (1) accurate measurement and prediction of the spatial and temporal distribution of precipitation over a catchment and (2) the efficient and appropriate description of the catchment properties are important issues in hydrology. This session focuses on the following aspects of the space-time variability of precipitation:
- Novel techniques for measuring liquid and solid precipitation at hydrologically relevant space and time scales, from in situ measurements to remote sensing techniques, and from ground-based devices to spaceborne platforms.
- Novel approaches to better identify, understand and simulate the dominant microphysical processes at work in liquid and solid precipitation.
- Applications of measured and/or modelled precipitation fields in catchment hydrological models for the purpose of process understanding or predicting hydrological response.

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Co-organized by AS5/NH1/NP3
Convener: Alexis Berne | Co-conveners: Hidde Leijnse, Taha Ouarda, Eric Wood (deceased)(deceased)
Displays
| Attendance Tue, 05 May, 10:45–12:30 (CEST)
HS7.10

Hydro-meteorological extremes such as floods, droughts, storms, or heatwaves often affect large regions therefore causing large damages and costs. Hazard and risk assessments, aiming at reducing the negative consequences of such extreme events, are often performed with a focus on one location despite the spatial nature of extreme events. While spatial extremes receive a lot of attention by the media, little is known about their driving factors and it remains challenging to assess their risk by modelling approaches. Key challenges in advancing our understanding of spatial extremes and in developing new modeling approaches include the definition of multivariate events, the quantification of spatial dependence, the dealing with large dimensions, the introduction of flexible dependence structures, the estimation of their probability of occurrence, the identification of potential drivers for spatial dependence, and linking different spatial scales. This session invites contributions which help to better understand processes governing spatial extremes and/or propose new ways of describing and modeling spatial extremes at different spatial scales.

Target audience: hydrologists, climatologists, statisticians, machine learners, and researchers interested in spatial risk assessments.

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Co-organized by NH1, co-sponsored by IAHS-ICSH
Convener: Manuela Irene BrunnerECSECS | Co-conveners: A.B. Bardossy, Philippe Naveau, Simon Michael PapalexiouECSECS, Elena Volpi
Displays
| Attendance Tue, 05 May, 16:15–18:00 (CEST)
HS7.2

The assessment of precipitation variability and uncertainty is crucial in a variety of applications, such as flood risk forecasting, water resource assessments, evaluation of the hydrological impacts of climate change, determination of design floods, and hydrological modelling in general. Within this framework, this session aims to gather contributions on research, advanced applications, and future needs in the understanding and modelling of precipitation variability, and its sources of uncertainty.
Specifically, contributions focusing on one or more of the following issues are particularly welcome:
- Novel studies aimed at the assessment and representation of different sources of uncertainty versus natural variability of precipitation.
- Methods to account for different accuracy in precipitation time series, e.g. due to change and improvement of observation networks.
- Uncertainty and variability in spatially and temporally heterogeneous multi-source precipitation products.
- Estimation of precipitation variability and uncertainty at ungauged sites.
- Precipitation data assimilation.
- Process conceptualization and modelling approaches at different spatial and temporal scales, including model parameter identification and calibration, and sensitivity analyses to parameterization and scales of process representation.
- Modelling approaches based on ensemble simulations and methods for synthetic representation of precipitation variability and uncertainty.
- Scaling and scale invariance properties of precipitation fields in space and/or in time.
- Physically and statistically based approaches to downscale information from meteorological and climate models to spatial and temporal scales useful for hydrological modelling and applications.

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Co-organized by AS1/CL2/NH1/NP3
Convener: Simone Fatichi | Co-conveners: Alin Andrei Carsteanu, Roberto Deidda, Andreas Langousis, Chris Onof
Displays
| Attendance Fri, 08 May, 14:00–15:45 (CEST)
HS7.8

Urban hydrological processes are characterized by high spatial variability and short response times resulting from a high degree of imperviousness. Therefore, urban catchments are especially sensitive to space-time variability of precipitation at small scales. High-resolution precipitation measurements in cities are crucial to properly describe and analyses urban hydrological response. At the same time, urban landscapes pose specific challenges to obtaining representative precipitation and hydrological observations.

This session focuses on high-resolution precipitation and hydrological measurements in cities and on approaches to improve modeling of urban hydrological response, including:

- Novel techniques for high-resolution precipitation measurement in cities and for multi-sensor data merging to improve the representation of urban precipitation fields.
- Novel approaches to hydrological field measurements in cities, including data obtained from citizen observatories.
- Precipitation modeling for urban applications, including convective permitting models and stochastic rainfall generators.
- Novel approaches to modeling urban catchment properties and hydrological response, from physics-based, conceptual and data-driven models to stochastic and statistical conceptualization.
- Applications of measured precipitation fields to urban hydrological models to improve hydrological prediction at different time horizons to ultimately enable improved management of urban drainage systems (including catchment strategy development, flood forecasting and management, real-time control and proactive protection strategies aimed at preventing flooding and pollution).
- Strategies to deal with upcoming challenges, including climate change and rapid urbanization.

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Co-organized by NH1
Convener: Nadav Peleg | Co-conveners: Elena Cristiano, Lotte de VosECSECS, Hannes Müller-Thomy, Susana Ochoa RodriguezECSECS
Displays
| Attendance Mon, 04 May, 14:00–15:45 (CEST)
HS2.2.2

Earth Systems Models aim at describing the full water- and energy cycles, i.e. from the deep ocean or groundwater across the sea or land surface to the top of the atmosphere. The objective of the session is to create a valuable opportunity for interdisciplinary exchange of ideas and experiences among members of the Earth System modeling community and especially atmospheric-hydrological modelers.
Contributions are invited dealing with approaches how to capture the complex fluxes and interactions between surface water, groundwater, land surface processes, oceans and regional climate. This includes the development and application of one-way or fully-coupled hydrometeorological prediction systems for e.g. floods, droughts and water resources at various scales. We are interested in model systems that make use of innovative upscaling and downscaling schemes for predictions across various spatial- and temporal scales. Contributions on novel one-way and fully-coupled modeling systems and combined dynamical-statistical approaches are encouraged. A particular focus of the session is on weakly and strongly coupled data assimilation across the different compartments of the Earth system for the improved prediction of states and fluxes of water and energy. Merging of different observation types and observations at different length scales is addressed as well as different data assimilation approaches for the atmosphere-land system, the land surface-subsurface system and the atmosphere-ocean system. The value of different measurement types for the predictions of states and fluxes, and the additional value of measurements to update states across compartments is of high interest to the session. We also encourage contributions on use of field experiments and testbeds equipped with complex sensors and measurement systems allowing compartment-crossing and multi-variable validation of Earth System Models.

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Co-organized by AS2/BG2/NH1/NP5/OS4
Convener: Harald Kunstmann | Co-conveners: Harrie-Jan Hendricks Franssen, Alfonso Senatore, Gabriëlle De Lannoy, Martin Drews, Lars Nerger, Stefan Kollet, Insa Neuweiler
Displays
| Attendance Tue, 05 May, 10:45–12:30 (CEST)
HS1.1.4

River monitoring remains a challenge for hydrologists and environmental agencies. The expansion of the human population, urbanisation, technological advancements and a changing global climate have put forward an ongoing water management agenda. River streamflow is one of the most crucial hydrological variables in terms of 'basin health' description (from an ecological point of view), and for flood risk management and modelling. However, despite significant efforts on river flow monitoring, long-term, spatially dense monitoring networks remain scarce, stressing the need for innovative solutions dealing with the twin challenges of a changing climate. Emerging innovative methods should be tested and benchmarked under different flow conditions to ensure accurate and consistent results and well-understood measurement uncertainties. Furthermore, these methods must be harmonised for promoting good practices and dissemination over the globe. In this context, this session focuses on:

1) The use of remote sensing approaches for hydrological and morphological monitoring;
2) Real-time acquisition of hydrological variables;
3) Innovative methodologies for measuring/modelling/estimating river stream flows;
4) Measuring the extremes of high and low flows associated with a changing climate;
5) Strategies to quantify and describe hydro-morphological evolution of rivers;
6) New methods to cope with data-scarce environments;
7) Inter-comparison of innovative and classical models and approaches;
8) Quantification of uncertainties; and,
9) Guidelines for hydro-morphological streamflow monitoring.

Contributions are welcome with emphasis on image-velocimetry or other velocity measurement techniques, wetted cross-section retrieval from digital surface models (e.g. computed with multi-media photogrammetry/structure-from-motion, or other bathymetric techniques), and quantification of stream flows and related uncertainties. Additionally, presentations of case studies using innovative sensors, Unmanned Aerial Systems (UASs) and Unmanned Surface Vehicles (USVs), airborne or satellite-based approaches, and traditional in-situ measurements are encouraged. This session is sponsored by the COST Action CA16219, Harmonisation of UAS techniques for agricultural and natural ecosystems monitoring (HARMONIOUS).
Note: This session is complemented by a field-based short-course, SC2.9, offering attendees the opportunity to experience some of these tools and techniques in a river environment.

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Co-organized by GM2/NH1
Convener: Alonso PizarroECSECS | Co-conveners: Filippo BandiniECSECS, Silvano F. Dal SassoECSECS, Nick Everard, Alexandre Hauet, Ida Westerberg, Anette EltnerECSECS, Mark Randall
Displays
| Attendance Mon, 04 May, 10:45–12:30 (CEST)
HS8.2.6

Karst environments are characterized by distinctive landforms and unique hydrologic behaviors. Karst systems are commonly extremely complex, heterogeneous, and very difficult to manage because their formation and evolution are controlled by a wide range of geological, hydrological, geochemical and biological processes. Further, karst systems are extremely vulnerable due to the direct connection between the surface and subsurface compartments through conduit networks. The great variability and unique connectivity may result in serious engineering problems: on one hand, karst groundwater resources are readily contaminated by pollution because of the rapidity of conduit flow; on the other hand, the presence of karst conduits that weakens the strength of the rock mass may lead to serious natural and human-induced hazards. The plan and development of engineering projects in karst environments thus require: 1) an enhanced understanding of natural processes that govern the initiation and
evolution of karst systems through both field and modelling approaches, and 2) specific interdisciplinary approaches aiming at better assessing the associated uncertainties and minimizing the detrimental effects of hazardous processes and environmental problems.
This session calls for abstracts on research related to geomorphology, hydrogeology, engineering geology, and/or hazard mitigation in karst environments in the context of climate change and increased human disturbance. It also aims to discuss various characterization and modelling methods applied in each specific
research domain, with their consequences on the understanding of the whole process of karst genesis and functioning.

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Co-organized by GM13/NH1
Convener: Hervé Jourde | Co-conveners: Joanna DoummarECSECS, Mario Parise, Natasa Ravbar, Xiaoguang WangECSECS
Displays
| Attendance Fri, 08 May, 14:00–15:45 (CEST)
HS7.6

This PICO session addresses three sub-topics :

Precipitation variability: from drop scale to lot scale:
The understanding of small scale (sec – drop scale to min -km) spatio-temporal variability of precipitation is essential for larger scale studies, especially in highly heterogeneous areas (mountains, cities). Nevertheless grasping this variability remains an open challenge. An illustration of the range of scales involved is the ratio between the effective sampling areas of point measurement devices (rain gauges and disdrometers) and weather radars, which is greater than 10^7! This session aims at bridging this scale gap and improving the understanding of small scale precipitation variability, both liquid and solid, as well as its hydro-meteorological consequences at larger scales.

Hydroclimatic and hydrometeorologic stochastics: Extremes, scales, probabilities:
The departure of statistical properties of hydrometeorological processes from the classical statistical prototype has been established. This session aims at presenting the latest developments on:
- Coupling stochastic approaches with deterministic hydrometeorological predictions;
- Stochastic-dynamic approaches;
- Variability at climatic scales and its interplay with the ergodicity of space-time probabilities;
- Linking underlying physics and scaling stochastics of hydrometeorological extremes;
- Development of parsimonious representations of probability distributions of hydrometeorological extremes over a wide range of scales and states; as well as their applications in risk analysis and hazard predictions
The session is co-sponsored by the ICSH-IAHS, former STAHY.

The atmospheric water cycle under change: feedbacks, land use, hydrological changes and implications :
Traditionally, hydrologists have always considered precipitation and temperature as input to their models and evaporation as a loss. However, more than half of the evaporation globally comes back as precipitation on land. Anthropogenic pressure through land-use changes (and greenhouse gasses) alter, not only, the local hydrology, but through atmospheric water and energy feedbacks also effect the water cycle in remote locations. This session aims to:
- investigate the remote and local atmospheric feedbacks from human interventions, based on observations and coupled modelling approaches.
- explore the implications of atmospheric feedbacks on the hydrologic cycle for land and water management (ex. changing land cover)

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Co-organized by AS4/CL2/NH1/NP3
Convener: Auguste Gires | Co-conveners: Jose Luis Salinas Illarena, Ruud van der Ent, Hannes Müller-Thomy, Lan Wang-Erlandsson, Remko Uijlenhoet, Katharina Lengfeld
Displays
| Attendance Wed, 06 May, 08:30–10:15 (CEST)
HS3.7

Geostatistics is commonly applied in the Water, Earth and Environmental sciences to quantify spatial variation, produce interpolated maps with quantified uncertainty and optimize spatial sampling designs. Extensions to the space-time domain are also a topic of current interest. Due to technological advances and abundance of new data sources from remote and proximal sensing and a multitude of environmental sensor networks, big data analysis and data fusion techniques have become a major topic of research. Furthermore, methodological advances, such as hierarchical Bayesian modeling and machine learning, have enriched the modelling approaches typically used in geostatistics.

Earth-science data have spatial and temporal features that contain important information about the underlying processes. The development and application of innovative space-time geostatistical methods helps to better understand and quantify the relationship between the magnitude and the probability of occurrence of these events.

This session aims to provide a platform for geostatisticians, soil scientists, hydrologists, earth and environmental scientists to present and discuss innovative geostatistical methods to study and solve major problems in the Water, Earth and Environmental sciences. In addition to methodological innovations, we also encourage contributions on real-world applications of state-of-the-art geostatistical methods.

Given the broad scope of this session, the topics of interest include the following non-exclusive list of subjects:
1. Advanced parametric and non-parametric spatial estimation and prediction techniques
2. Big spatial data: analysis and visualization
3. Optimisation of spatial sampling frameworks and space-time monitoring designs
4. Algorithms and applications on Earth Observation Systems
5. Data Fusion, mining and information analysis
6. Integration of geostatistics with optimization and machine learning approaches
7. Application of covariance functions and copulas in the identification of spatio-temporal relationships
8. Geostatistical characterization of uncertainties and error propagation
9. Bayesian geostatistical analysis and hierarchical modelling
10. Functional data analysis approaches to geostatistics
11. Geostatistical analysis of spatial compositional data
12. Multiple point geostatistics
13. Upscaling and downscaling techniques
14. Ontological framework for characterizing environmental processes

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Co-organized by ESSI1/GI6/NH1/SSS10
Convener: Emmanouil Varouchakis | Co-conveners: Gerard Heuvelink, Dionissios Hristopulos, R. Murray Lark, Alessandra MenafoglioECSECS
Displays
| Attendance Wed, 06 May, 08:30–10:15 (CEST)
HS2.4.6

In the current context of global change, assessing the impact of climate variability and changes on hydrological systems and water resources is increasingly crucial for society to better-adapt to future shifts in water resources as well as extreme conditions (floods and droughts). However, hitherto, important sources of uncertainties have been neglected in forecasting climate impacts on hydrological systems, especially uncertainties associated with internal/natural climate variability, whose contribution to near-future changes could be as important as forced anthropogenic climate changes at the regional scales. Internal climate modes of variability (e.g. ENSO, NAO, AMO) and their impact on the continent are not properly reproduced in the current global climate models, leading to large underestimations of decadal climate and hydroclimatic variability at the global scale. At the same time, hydrological response strongly depends on catchment properties, whose interactions with climate variability are little understood at the decadal timescales. These factors altogether reduce significantly our ability to understand long-term hydrological variability and to improve projection and reconstruction of future and past hydrological changes on which improvement of adaption scenarios depends.
We welcome abstracts capturing recent insights for understanding past or future impacts of large-scale climate variability on hydrological systems and water resources as well as newly developed projection and reconstruction scenarios. Results from model intercomparison studies are encouraged.

Public information:
Dear all,

We hope that you are all well, and ready to participate to the EGU 2020 “sharing geoscience online”.
Our session "HS2.4.6/CL2.29/NH1.21: Understanding the links between hydrological variability and internal/natural climate variability" is scheduled tomorrow (Thursday 07) at 10:45-12:30 (CET time).
As you might have noticed in the last days, chairing the online chat requires some managements. With the convener team, we therefore agreed on an organisation plan to enable everyone to present their displays, and discuss it smoothly with the session participants.

First, we would appreciate if you could upload your presentation materials as soon as possible. Because there is not much time per presentation in the chats, participants are reviewing materials in advance of the scheduled sessions, in order to maximise discussion time.

If the first author of your display will not be available, we request that you let us know in advance, who is attending, so we can be sure all expected presenters are online.

When posting your questions, as well as replying, we recommend you begin your questions/answers with @1stAuthorName (e.g. in my case @Bastien). This will make sure that the question/answer is addressed to the right correspondent.

Below are some information on the conduct of our session:

i) We will go through ONLY the presentations which have uploaded materials for displays, and we will follow the order provided on the session programme;

ii) After a brief introduction, we will give 10 minutes to all participants to look through the different displays;

iii) We will then call each author, who will have 2-3 minutes to tell us about their work. As this is not that easy, we strongly recommend you to prepare few highlights (context + bullet points; max. 6 sentences) in advance. So, you can just paste it at the time.

iv) We then will allow 2-3 minutes for questions to each author. Again, we recommend you to prepare any questions for the other authors in advance.

v) Finally, we will thank all the participants, and call for online comments on the website.
We hope to “see” you tomorrow morning, and we hope this will be a nice experience for everyone.

To help with this, we would appreciate if you could upload your material as soon as you can. Bear in mind that it can be updated at anytime.

Note that the time allocated to the presentation and questions might have to be adjusted tomorrow, depending on the final number of displays

Best Regards,
Bastien, Jean-Philippe, Katie and Nicolas

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Co-organized by CL2/NH1
Convener: Bastien Dieppois | Co-conveners: Nicolas Massei, Katie Facer-ChildsECSECS, Jean-Philippe Vidal
Displays
| Attendance Thu, 07 May, 10:45–12:30 (CEST)
CL4.17

Mountains cover approximately one quarter of the total land surface on the planet, and a significant fraction of the world’s population lives in their vicinity. Orography critically affects weather and climate processes at all scales and, in connection with factors such as land-cover heterogeneity, is responsible for high spatial variability in mountain weather and climate.

Due to this high complexity, monitoring and modeling the atmosphere and the other components of the climate system in mountain regions is challenging both at short (meteorological) and long (climatological) time-scales. This session is devoted to the better understanding of weather and climate processes in mountain and high-elevation areas around the globe, as well as their modification induced by global environmental change.

We welcome contributions describing the influence of mountains on the atmosphere on meteorological time-scales, including terrain-induced airflow, orographic precipitation, land-atmosphere exchange over mountains, forecasting and predictability of mountain weather. Furthermore we invite studies that investigate climate processes and climate change in mountain areas and its impacts on dependent systems, based on monitoring and modeling activities. Particularly welcome are contributions that merge various sources of information and reach across disciplinary borders (atmospheric, hydrological, cryospheric, ecological and social sciences). In this respect the session invites also contributions on outcomes of the WMO "High Mountain Summit" taking place in October 2019.

Public information:
Online survey (including questions about a possible follow-up webinar): https://form.jotformeu.com/83462227858365

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Co-organized by AS1/CR7/NH1
Convener: Wolfgang Schöner | Co-conveners: Carolina Adler, Maria Vittoria Guarino, Elisa Palazzi, Stefano Serafin
Displays
| Attendance Mon, 04 May, 14:00–15:45 (CEST)
AS1.22

The understanding of tropical phenomena and their representation in numerical models still raise important scientific and technical questions, particularly in the coupling between the dynamics and diabatic processes. Among these phenomena, tropical cyclones (TC) are of critical interest because of their societal impacts and because of uncertainties in how their characteristics (cyclogenesis processes, occurrence, intensity, latitudinal extension, translation speed) will change in the framework of global climate change. The monitoring of TCs, their forecasts at short to medium ranges, and the prediction of TC activity at extended range (15-30 days) and seasonal range are also of great societal interest.

The aim of the session is to promote discussions between scientists focusing on the physics and dynamics of tropical phenomena. This session is thus open to contributions on all aspects of tropical meteorology between the convective and planetary scale, such as:

- Tropical cyclones,
- Convective organisation,
- Diurnal variations,
- Local circulations (i.e. island, see-breeze, etc.),
- Monsoon depressions,
- Equatorial waves and other synoptic waves (African easterly waves, etc.),
- The Madden-Julian oscillation,
- etc.

We especially encourage contributions of observational analyses and modelling studies of tropical cyclones and other synoptic-scale tropical disturbances including the physics and dynamics of their formation, structure, and intensity, and mechanisms of variability of these disturbances on intraseasonal to interannual and climate time scales.

Findings from recent field campaigns such as YMC and PISTON are also encouraged.

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Co-organized by CL2/NH1
Convener: Jean Philippe Duvel | Co-conveners: Eric Maloney, Kevin Reed, Enrico Scoccimarro, Allison WingECSECS
Displays
| Attendance Wed, 06 May, 14:00–18:00 (CEST)
AS1.23

This session investigates mid-latitude cyclones and storms on both hemispheres. We invite studies considering cyclones in different stages of their life cycles from the initial development, to large- and synoptic-scale conditions influencing their growth to a severe storm, up to their dissipation and related socioeconomic impacts.
Papers are welcome, which focus also on the diagnostic of observed past and recent trends, as well as on future storm development under changed climate conditions. This will include storm predictability studies on different scales. Finally, the session will also invite studies investigating impacts related to storms: Papers are welcome dealing with vulnerability, diagnostics of sensitive social and infrastructural categories and affected areas of risk for property damages. Which risk transfer mechanisms are currently used, depending on insured and economic losses? Which mechanisms (e.g. new reinsurance products) are already implemented or will be developed in order to adapt to future loss expectations?

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Co-organized by CL4/NH1/OS1
Convener: Gregor C. Leckebusch | Co-conveners: Joaquim G. Pinto, Uwe Ulbrich
Displays
| Attendance Mon, 04 May, 16:15–18:00 (CEST)
AS5.4

As the societal impacts of hazardous weather and other environmental pressures grow, the need for integrated predictions which can represent the numerous feedbacks and linkages between physical and chemical atmospheric processes is greater than ever. This has led to development of a new generation of high resolution multi-scale coupled prediction tools to represent the two-way interactions between aerosols, chemical composition, meteorological processes such as radiation and cloud microphysics.
Contributions are invited on different aspects of integrated model and data assimilation development, evaluation and understanding. A number of application areas of new integrated modelling developments are expected to be considered, including:
i) improved numerical weather prediction and chemical weather forecasting with feedbacks between aerosols, chemistry and meteorology,
ii) two-way interactions between atmospheric composition and climate variability.
This session aims to share experience and best practice in integrated prediction, including:
a) strategy and framework for online integrated meteorology-chemistry modelling;
b) progress on design and development of seamless coupled prediction systems;
c) improved parameterisation of weather-composition feedbacks;
d) data assimilation developments;
e) evaluation, validation, and applications of integrated systems.
This Section is organised in cooperation with the Copernicus Atmosphere Monitoring Service (CAMS) and the WMO Global Atmosphere Watch (GAW) Programme.
This year session is dedicated to the Global Air Quality Forecasting and Information Systems (GAFIS) - a new initiative of WMO and several international organizations - to enable and provide science-based air quality forecasting and information services in a globally harmonized and standardized way tailored to the needs of society.

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Co-organized by NH1, co-sponsored by WMO and CAMS
Convener: Alexander Baklanov | Co-conveners: Johannes Flemming, Georg Grell
Displays
| Attendance Tue, 05 May, 16:15–18:00 (CEST)
AS1.30

In recent years, attention was paid to the detection and monitoring of volcanic ash clouds as their impact on the air traffic control system was unprecedented. Volcanic clouds are dangerous for the aviation as they can cause damage of the aircraft systems and engines not only close to active volcanoes but also at large distance from the eruption.
The intensity of the extreme convective events is supposed to increase worldwide due to the climate change and they can also cause large damages and affect air safety.

The recent Anak Krakatau, Raikoke and Ulawun eruptions highlighted the issue on different techniques to distinguish volcanic ash clouds from convective clouds, and the unsolved problem to understand if the cloud top is tropospheric or stratospheric.

The “extreme clouds” detection and estimation of their physical parameters is a highly multidisciplinary and challenging topic since the same techniques and instruments can be used for meteorology, volcanic monitoring, atmospheric physics and climate purposes. There is an urgent need to develop new techniques and instruments for monitoring, detecting and modeling “extreme clouds” to develop early warning systems and to support users, decision makers and policy makers.

This session solicits the latest studies from the spectrum of:
- Volcanic and Convective Clouds (CVC) remote sensing, detection, monitoring, modeling, forecasting and nowcasting
- understanding of CVC structure, including overshooting and ice clouds
- understanding the impact of CVC on climate changes and air safety
- proposal of new products or services focused on the end-users prospective (air traffic management and air safety)
- discussion on the recent Anak Krakatau, Raikoke and Ulawun eruptions

By considering studies over this range of topics we aim to identify new methods, detail current challenges, understand common techniques/methods and identify common discussions within the communities of atmospheric physicists, meteorologists, modelers, air traffic managers, pilots sensors engineers and engines manufacturers.

We particularly welcome and encourage contributions connecting different fields such as:
- forecasting tools to support air traffic management improving the limits of the present science and new products/tools providing better services to the end-users,
- extreme clouds remote sensing with novel techniques and new sensors,
- novel techniques to detect overshooting and their impact on climate.

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Co-organized by GMPV9/NH1
Convener: Riccardo Biondi | Co-conveners: Elisa Carboni, Stefano Corradini, Isabelle TaylorECSECS
Displays
| Attendance Mon, 04 May, 08:30–10:15 (CEST)
NP6.3

The multitude of processes of various scales occurring simultaneously under strong winds in the air and sea boundary layers presents a true challenge for nonlinear science. We want to understand the physics of these processes, their specific role, their interactions and how they can be probed remotely, how these processes differ from their counterparts under moderate/weak winds. We welcome theoretical, experimental and numerical works on all aspects of processes in turbulent boundary layers above and below the ocean surface. Although we are particularly interested in the processes and phenomena occurring under strong wind conditions, the works concerned with similar processes under weaker winds which might provide an insight for rough seas are also welcomed. We are also very interested in works on remote sensing of these processes.
The areas of interest include the processes at and in the vicinity of the interface (nonlinear dynamics of surface water, wave-turbulence interactions, wave breaking, generation and dynamics of spray and air bubbles, thermodynamics of the processes in the boundary layers, heat and gas exchange), all the processes above and below the aIr/water interface, as long as they are relevant for strong wind conditions (such as, e.g. inertial waves generated by changing winds). Relevant nonlinear biological phenomena are also welcomed.
The main aims of the session is to initiate discussion of the multitude of processes active under strong winds across the narrow specializations as a step towards creating an integrated picture. Theoretical, numerical, experimental and observational works are welcomed.

Geophysical Fluid Dynamics (GFD) is a truly interdisciplinary field, including different topics dealing with rotating stratified fluids. It emerges in the late 50s, when scientists from meteorology, oceanography, astrophysics, geological fluid dynamics, and applied mathematics began to mathematically model complex flows and thereby unify these fields. Since then many new aspects were added and deeper insight into many problems has been achieved. New mathematical and statistical tools were developed, standard techniques were refined, classical problems were varied. In this session we primarily focus on contributions from dynamic meteorology and physical oceanography that model flows by mathematical analysis. However, it is also a forum for experimental GFD and for astrophysical and geological aspects of GFD as well.

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Co-organized by AS2/NH1/OS4
Convener: Yuliya Troitskaya | Co-conveners: Uwe Harlander, Vladimir Kudryavtsev, Victor Shrira, Wu-ting Tsai, Claudia Cherubini, Michael Kurgansky, Andreas Will
Displays
| Attendance Fri, 08 May, 10:45–12:30 (CEST), Attendance Fri, 08 May, 14:00–15:45 (CEST)
NP2.1

Recent years have seen a substantial progress in the understanding of the nonlinear and stochastic processes responsible for important dynamical aspects of the complex Earth system. The Earth system is a complex system with a multitude of spatial and temporal scales which interact nonlinearly with each other. For understanding this complex system new methods from dynamical systems, complex systems theory, complex network theory, statistics and climate and Earth sciences are needed.

In this context the session is open to contributions on all aspects of the nonlinear and stochastic dynamics of the Earth system, including the atmosphere, the ocean and the climate system. Communications based on theoretical and modeling studies, as well as on experimental investigations are welcome. Studies that span the range of model hierarchy from idealized models to complex Earth System Models (ESM), data driven models, use observational data and also theoretical studies are particularly encouraged.

Invited Speaker: Anna von der Heydt (Utrecht University)

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Co-organized by AS4/CL4/NH1/OS4
Convener: Christian Franzke | Co-conveners: Hannah Christensen, Balasubramanya Nadiga, Paul Williams, Naiming Yuan, François G. Schmitt, Guillaume Charria, Véronique Garçon
Displays
| Attendance Wed, 06 May, 14:00–15:45 (CEST)
NP1.1

Taking inspiration from the Mathematics of Planet Earth 2013 initiative, this session aims at bringing together contributions from the growing interface between the geophysical, the mathematical, and the theoretical physical communities. Specific topics include: PDEs, numerical methods, extreme events, statistical mechanics, pattern formation and emergence, (random and non-autonomous ) dynamical systems, large deviation theory, response theory, tipping points, model reduction techniques, coarse graining, stochastic processes, parametrizations, data assimilation, and thermodynamics. We invite talks and poster both related to specific applications as well as more speculative and theoretical investigations. We particularly encourage early career researchers to present their interdisciplinary work in this session.

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Co-organized by AS4/CL4/NH1
Convener: Valerio Lucarini | Co-conveners: Peter Ashwin, Niklas Boers, Vera Melinda Galfi, Michel Crucifix, Hansjoerg Seybold, Piotr Szymczak
Displays
| Attendance Mon, 04 May, 14:00–18:00 (CEST)
NH1.32

Heat extremes are already one of the deadliest meteorological events and they are projected to increase in intensity and frequency due to rising CO2 emissions. The hazard these events pose to society may therefore increase dramatically, and society will need to adapt if the worst impacts are to be avoided. This session therefore welcomes a broad range of new research addressing the challenge of extreme heat. Suitable contributions may: (i) assess the drivers and underlying processes of extreme heat in observations and/or models; (ii) explore the diverse socio-economic impacts of extreme heat events (for example, on aspects relating to human health or economic productivity); (iii) address forecasting of extreme heat at seasonal to sub-seasonal time scales; (iv) focus on societal adaptation to extreme heat, including (but not limited to) the implementation of Heat-Health Early Warning Systems.

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Convener: Tom Matthews | Co-conveners: Ana Casanueva, Martha Marie Vogel
Displays
| Attendance Tue, 05 May, 10:45–12:30 (CEST)

NH2 – Volcanic Hazards

Programme group scientific officer: Paraskevi Nomikou

NH2.1

Volcanic islands are built from the sea floor at depths ranging from shallow coastal zones to the deep ocean. They occur in island arc, hotspot and rift zone settings. Submarine volcanic activity with associated magma-water interaction commonly precedes island formation. Recent unrest at oceanic islands and submarine volcanoes exposes the need for further identifications of risk posed to local communities. Many parameters of submarine to emergent volcanic activity are under active investigation, including the relationship between water depth and explosive activity, magma properties and magma composition, and the evolving material properties of their pyroclastic deposits and their influences on fluid, heat and solute fluxes and the initiation and development of authigenic minerals and microbial life. The aim of this session is to bring together experts from diverse disciplines to explore eruption mechanisms, island structure, island stability, hazards posed to coastal communities by unrest and eruption and the long term chemical and physical influences of submarine to emergent volcanic islands on oceanic processes.

The session will include presentations that integrate innovative and emerging technologies to enable focused and multi-disciplinary studies of recent and ancient eruptions and their products, as well as breakthrough developments in understanding the impacts of disastrous submarine volcanic hazards on present and past societies.

We especially welcome abstracts in the following areas:
- Submarine volcanic hazards such as explosive eruptions, volcanic earthquakes, submarine landslides, hydrothermal emissions and volcanogenic tsunamis.
- Mechanics of submarine and emergent volcanic eruptions and formation of oceanic islands.
- Optimal monitoring technologies and state of the art methods that explore submarine to emergent volcanoes, which host hydrothermal systems, mineral deposits and biomediated processes.
- Recommendations for volcanic crisis management, public awareness and preparedness through improved understanding of the hazards and impacts of submarine to emergent volcanoes.

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Co-organized by GMPV10
Convener: Magnus Tumi Gudmundsson | Co-conveners: Marie Dolores Jackson, Paraskevi Nomikou
Displays
| Attendance Tue, 05 May, 16:15–18:00 (CEST)
GMPV9.7

Over the past few years, major technological advances allowed to significantly increase both the spatial coverage and frequency bandwidth of multi-disciplinary observations at active volcanoes. Networks of instruments for the quantitative measurement of many parameters now permit an unprecedented, multi-parameter vision of the surface manifestations of mass transport beneath volcanoes. Furthermore, new models and processing techniques have led to innovative paradigms for inverting observational data to image the structures and interpret the dynamics of volcanoes. Within this context, this session aims at bringing together a multidisciplinary audience to discuss the most recent innovations in volcano imaging and monitoring, and to present observations, methods and models that increase our understanding of volcanic processes.
We welcome contributions (1) related to methodological and instrumental advances in geophysical, geological and geochemical imaging of volcanoes, and (2) to explore new knowledge provided by these studies on the internal structure and physical processes of volcanic systems.
We invite contributors from all geophysical, geological and geochemical disciplines such as seismology, electromagnetics, geoelectrics, gravimetry, magnetics, muon tomography, volatile measurements and analysis; from in-situ monitoring networks to high resolution remote sensing and innovative processing methods, applied to volcanic systems ranging from near-surface hydrothermal activity to magmatic processes at depth.

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Co-organized by NH2/SM6
Convener: Jurgen Neuberg | Co-conveners: Benoît SmetsECSECS, Luca De Siena, Thomas R. Walter, Rachel Whitty, Hugues Brenot, Nicolas d'Oreye, Gaetana Ganci
Displays
| Attendance Tue, 05 May, 08:30–12:30 (CEST)
GMPV8.3

Magmatic processes occurring at depth within volcanic plumbing systems are complex and play a fundamental role in controlling the tempo and style of volcanic activity. To unravel the structural complexity and temporal evolution of plumbing systems a multidisciplinary approach is necessary. This session aims to bring together scientists working on the understanding of the structural, chemical and temporal evolution of magmatic systems using, for example, fieldwork, petrology, geochemistry, geophysics, geodesy, experiments or numerical modelling to diffuse the boundaries between disciplines and lead to a comprehensive understanding of the inner workings of Volcanic and Igneous Plumbing Systems (VIPS).

This session is sponsored by the IAVCEI Commission on Volcanic and Igneous Plumbing Systems.

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Co-organized by NH2, co-sponsored by AGU and IAVCEI
Convener: Fabio Arzilli | Co-conveners: Flavio Di StefanoECSECS, Olivier Galland, Pier Paolo Giacomoni, Maurizio Petrelli, Tobias SchmiedelECSECS, Gregor WeberECSECS
Displays
| Attendance Tue, 05 May, 14:00–18:00 (CEST)
GMPV1.6

Natural fluids mainly escape from the Earth interior in volcanoes and active seismic regions. New attention is recently posed to the quiescent volcanoes since multidisciplinary investigations showed that magma accumulations at depth coupled to high degassing of volatiles still occurs after long time from the last activity highlighting a risk of reactivation after long phases of inactivity. Furthermore, magma accumulations in regions far from volcanism have an active role in seismicity, in fact magma and its volatiles can lubricate faults and generate overpressure in crustal layers.
Fluids have a key role in processes that generate volcanic activity and earthquakes; they transfer messages to the surface about how the natural systems work. The geochemical monitoring allows recognizing these natural processes and their evolution over time. Recently geochemical observations are supported by the advances of technology that also permit to measure at high frequency geochemical parameters in site. Furthermore new experimental works are producing constrains about the origin and migration of fluids and their behavior during rock deformation.
We are approaching an interesting phase where the geochemistry can actively interact in a multidisciplinary context for investigating natural processes. Great interest is towards the use of the new technologies and methods to solve for complex analytical challenges in geochemical investigations and monitoring of volcanoes and seismic regions. Their use coupled to the basic models of rock-fluids interactions and experiments of fluids generation/migration is contributing to improve the understanding of these natural processes, providing fundamental constrains for monitoring.
We welcome abstracts from various backgrounds, including researchers using traditional and non-traditional geochemical tracers, noble gases, stable isotopes and water chemistry. We wish that this session will be of broad interest to researchers studying hydro-geochemistry, isotope geochemistry, volcanic degassing etc. This will lead to a session that reflects a cross-section of researchers who apply these tracers to the monitoring of volcanoes and seismic activity. We hope in this way to highlight the potential scientific advances available through the combination of these complementary areas of study and specific techniques, and to encourage future collaborative efforts to resolve the many outstanding questions in volcanic and seismically active systems.

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Co-organized by NH2, co-sponsored by EAG
Convener: Antonio Caracausi | Co-conveners: Kyriaki DaskalopoulouECSECS, Emilie Roulleau, Yuji Sano, Sheng Xu, Artur IonescuECSECS, Brendan McCormick KilbrideECSECS
Displays
| Attendance Fri, 08 May, 08:30–10:15 (CEST)
GMPV8.4

Snapshots of magma chemistry recorded in magmas and crystal cargoes reflect combinations of processes that operate in the magma source (e.g. metasomatism and tapping of various mantle components) and during differentiation in the crust (e.g. fractional crystallization, crustal assimilation, mixing/mingling, replenishment of magma reservoirs and chambers, and crustal melting). The fundamental questions addressed by this session concern the principal controls on primary, parental and derivative magma compositions as witnessed by the crystalline components of magmas, isotopic records, and experiments that replicate natural systems. We therefore welcome contributions focusing on the generation and differentiation of magmas in the mantle and crust with particular emphasis on crystal-scale studies, experimental petrology, thermodynamic and geochemical modelling, and layered intrusions.

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Co-organized by NH2
Convener: Frances DeeganECSECS | Co-conveners: Ben Ellis, Carmela Freda, Valentin Troll, Ilya Veksler
Displays
| Attendance Mon, 04 May, 08:30–12:30 (CEST)
SSP2.14

We are presently facing the 6th mass extinction, what can be learnt from the past ?
The session will focus on the six major Phanerozoic mass extinctions including the Anthropocene one, but contributions from other environmental crises (e.g. OAEs, PETM) are also welcome.

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Co-organized by GMPV10/NH2
Convener: Thierry Adatte | Co-conveners: David Bond, Alicia FantasiaECSECS, Nicolas Thibault
Displays
| Attendance Wed, 06 May, 16:15–18:00 (CEST)
SM6.5

Seismology is fundamental for monitoring and investigating volcanic systems.
Volcanoes are complex systems comprising both time-varying processes and structural heterogeneity. This combination of wide-ranging complex processes, extreme geomechanical heterogeneity, frequently rapid changes in time, leads to challenges in interpreting seismic observations in terms of physical processes at depth. In addition, the link between the variety of physical processes beneath volcanoes and their seismic response (or lack of) is often poorly understood, making it difficult to develop a detailed understanding of the physical processes at work in volcanic systems.
To address these challenges, this session aims to bring together seismologists, volcano and geothermal seismologists, and wave propagation and source modellers working on different aspects of volcano seismology including but not limited to: (i) seismicity catalogues (statistics & spatio-temporal evolution of seismicity), (ii) innovative methods for source locations (iii) source inversions (iv) seismic wave propagation & scattering, (v) small scale deformation studies, (vi) new developments in volcano imagery, (vii) time-lapse studies – including the use of noise, multiplets and high-rate GPS. Studies on geothermal systems in volcanic environments are also welcome.
By considering interrelationships between these complementary seismological areas, we aim to develop a coherent picture of the latest advances, successful applications and outstanding challenges in volcano seismology.

Public information:
SCHEDULE

16:15 Start of the session
Introduction

16:20 Guardo et al.: “Space-weighted seismic attenuation multi-frequency tomography at Deception Island volcano (Antartica)” (EGU2020-9986)

16:25 Eibl et al.: “Rotational sensor on a volcano: New insights from Etna, Italy” (EGU2020-18862)

16:30 Gabrielli et al.: “Geomorphological controls on seismic recordings in volcanic areas” (EGU2020-511)

16:35 Metaxian et al.: “Towards real-time monitoring with a seismic antenna at Merapi volcano” (EGU2020-19068)

16:40 Falcin et al.: “Automatic classification of seismo-volcanic signals at La Soufrière of Guadeloupe” (EGU2020-10234)

16:45 Lamb et al.: “Identifying icequakes at ice-covered volcanoes in Southern Chile” (EGU2020-851)

16:50 Battaglia et al.: “Discriminating icequakes from volcanic seismicity at Cotopaxi volcano (Ecuador) “ (EGU2020-11749)

16:55 Garza-Giron et al.: “Hidden earthquakes unveil the dynamic evolution of a large-scale explosive eruption “ (EGU2020-14124)

17:00 Shapiro et al.: "Degassing of volatile-reach basaltic magmas: source of deep long period volcanic earthquakes" (EGU2020-8251)

17:05 Cesca et al.: “The seismic sound of deep volcanic processes”, (EGU2020-6813)

17:10 Sadeghi and Suzuki: “The 11 November 2018 Mayotte event was observed at the Iranian Broadband seismic stations” (EGU2020-9767)

17:15 Ikegaya and Yamamoto: “Spatio-temporal characteristics and focal mechanisms of deep low-frequency earthquakes beneath Zao volcano, Japan”, (EGU2020-12533)

17:20 Möllhoff et al.: “Recent microseismicity observed at Hekla volcano and first velocity inversion results” (EGU2020-18954)

17:25 Bjarnasson et al. (presenting Revathy Parameswaran): “Interseismic stress field variations in Hjalli-Ölfus, SW Iceland” (EGU2020-8521)

17:30 Eibl et al.: “Seismic Eruption Catalog of Strokkur Geyser, Iceland“ (EGU2020-16535)

17:35 Thorbjarnardóttir et al.: “The Great Geysir and tectonic interactions in South Iceland”, (EGU2020-16388)

17:40 Nooshiri et al.: “Source mechanisms of seismic events during the 2018 eruption of Sierra Negra Volcano (Galapagos) determined by using polarization properties of complete (near-field and far-field) body waves”, (EGU2020-11297)

17:45 Longobardi,et al.: “Multiplet Based Time Lapse Velocity Changes Prior to the 2018 Eruption of Sierra Negra Volcano, Galapagos Island Observed with Coda Wave Interferometry” (EGU2020-18213)

17:50 Ka Lok Li et al.: “Different mechanisms of the pre- and co-eruptive tremor during the 2018 eruption at Sierra Negra volcano, Galapagos” (EGU2020-18975)

17:55 Dehghanniri and Jellinek: “An Experimental Study of Volcanic Tremor Driven by Magma Wagging” (EGU2020-11365)



FORMAT OF THE SESSION: Each author will present her/his work by highlighting the main points (ideally copy/paste). Please do it in a short summary. This will be followed by questions and discussion. The length of the individual slot (including questions) is 5 minutes.

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Co-organized by GMPV9/NH2
Convener: Ivan Lokmer | Co-conveners: Chris Bean, Vala Hjörleifsdóttir, Kristín Jónsdóttir, Diana Roman
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| Attendance Thu, 07 May, 16:15–18:00 (CEST)
GMPV9.5

The session deals with the documentation and modelling of the tectonic, deformation, and geodetic features of any type of volcanic area, on Earth and in the Solar System. The focus is on advancing our understanding on any type of deformation of active and non-active volcanoes, on the associated behaviours, and the implications for hazards. We welcome contributions based on results from fieldwork, remote-sensing studies, geodetic and geophysical measurements, analytical, analogue and numerical simulations, and laboratory studies of volcanic rocks. We also welcome multidisciplinary studies, especially those that integrate data collected at different scales (e.g. laboratory and field data).
Studies may be focused at the regional scale, investigating the tectonic setting responsible for and controlling volcanic activity, both along divergent and convergent plate boundaries, as well in intraplate settings. At a more local scale, all types of surface deformation in volcanic areas are of interest, such as elastic inflation and deflation, or anelastic processes, including caldera and flank collapses. Deeper, sub-volcanic deformation studies, concerning the emplacement of intrusions, as sills, dikes, and laccoliths, are most welcome.
We also particularly welcome geophysical data aimed at understanding magmatic processes during volcano unrest. These include geodetic studies obtained mainly through GPS and InSAR, as well as studies that model these data to image sources.


The session includes, but is not restricted to, the following topics:
• volcanism and regional tectonics;
• formation of magma chambers, laccoliths, and other intrusions;
• dyke and sill propagation, emplacement, and arrest;
• earthquakes and eruptions;
• caldera collapse, resurgence, and unrest;
• flank collapse;
• volcano deformation monitoring;
• volcano deformation and hazard mitigation;
• volcano unrest;
• mechanical properties of rocks in volcanic areas.

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Co-organized by GD4/NH2/TS13
Convener: Valerio Acocella | Co-conveners: Agust Gudmundsson, Michael Heap, Sigurjon Jonsson, Virginie Pinel
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| Attendance Fri, 08 May, 14:00–15:45 (CEST), Attendance Fri, 08 May, 16:15–18:00 (CEST)

NH3 – Landslide Hazards

Programme group scientific officer: Michel Jaboyedoff

NH3.1

Large slope instabilities have been recognised in mountainous areas in different lithological and geological domains, and on other planets. Slow to extremely fast moving, complex mass movements have been recognized and sometimes described as strongly interrelated. Many types of slope instabilities can be grouped within this broad class, each presenting different types of hazard and risk. Some major aspects of these slope instabilities are still debated:
- regional distribution and relevance;
- presence, distribution and significance of phenomena on other planets;
- triggering and controlling factors;
- dating of initial movements and reactivation episodes;
- style and state of past and present activity;
- passive and/or active control by structural-tectonic elements;
- hydrological boundary conditions;
- possible evolution and modelling;
- assessment of related hazard;
- influence of anthropogenic factors and effects on structures;
- role on the erosional and sediment yield regime in drainage catchments and mountain belts;
- technologies for monitoring and warning systems, and the interpretation of monitoring data.
Study of these instabilities involves geology, geomorphology, geomechanics, hydro-geochemistry, and geophysics. For landslides on other planets a few of these approaches can be adopted making more difficult the interpretation of the phenomena, the identification of triggerings and controlling factors.
Trenching and drilling can be used for material characterization, recognition of activity episodes, which can be combined with monitoring data for establishing of warning thresholds and systems.
Geophysical survey methods can describe both the geometrical and geomechanical characteristics of the unstable mass. Dating techniques can be applied to determine the age of movements. Modelling can be applied to evaluate instability and failure, triggering (rainfall, seismicity, volcanic eruption, deglaciation), failure propagation, collapse (rock avalanches, debris avalanches and flows), and secondary failures (rockfall, debris flows).
Different hydraulic and hydrologic boundary conditions and hydrochemistry are involved, both at failure and during reactivations. The impacts of such instabilities on structures and human activities can be substantial and of a variety of forms. Furthermore, the local and regional sediment yield could be influenced by the landsliding activity and different landslides (e.g. type, size) can play different roles.

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Co-organized by GM4
Convener: Giovanni Crosta | Co-conveners: Federico Agliardi, Masahiro Chigira, Fabio Vittorio De BlasioECSECS
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| Attendance Tue, 05 May, 14:00–18:00 (CEST)
NH3.2

Rockfalls, rockslides and rock avalanches are fundamental modes of erosion on steep hillslopes, and among the primary hazards in steep alpine terrain. To better understand the processes driving rock slope degradation, mechanisms contributing to the triggering, transport, and deposition of resulting rock slope instabilities, and mitigation measures for associated hazards, we must develop insight into both the physics of intact and rock mass failure and the dynamics of transport processes. This session aims to bring together state-of-the-art methods for predicting, assessing, quantifying, and protecting against rock slope hazards. We seek innovative contributions from investigators dealing with all stages of rock slope hazards, from weathering and/or damage accumulation, through detachment, transport and deposition, and finally to the development of protection and mitigation measures. In particular, we seek studies presenting new theoretical, numerical or probabilistic modelling approaches, novel data sets derived from laboratory, in situ, or remote sensing applications, and state-of-the-art approaches to social, structural, or natural protection measures.

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Co-organized by GM4
Convener: Michael Krautblatter | Co-conveners: Axel Volkwein, Anne Voigtländer, Matthew Westoby, Andreas EwaldECSECS
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| Attendance Thu, 07 May, 14:00–15:45 (CEST)
NH3.4

This session aims to discuss precipitation-induced hydrological and geomorphological processes such as different types of landslides on local and regional scale in natural and human-modified landscapes. Landslides and mobilized in-stream sediment represent an important source of hazard for economic activities, infrastructures and population living on the slopes and in adjacent lowland areas.
Precipitation-induced hydro-geomorphological processes can deliver large volumes of sediment to the stream network and are often associated with the occurrence of shallow landslides and channelized debris flows. Water circulation within a catchment and the resultant transient changes in both shallow and deep hydrological systems is the most common controlling and triggering factor of slope movements and debris flows. However, incorporation of hydrological process knowledge in these processes, such as water-rock interaction, water storage, dynamic preferential flows or the influence of frost conditions to name a few, still lags behind. Detailed monitoring, analysis and modelling of hydro-geomorphological processes are required to improve our understanding and prediction of the spatio-temporal patterns of the hydro-geomorphological processes.
The purpose of this session is to gather contributions aimed at understanding the influence of environmental and anthropic factors on the hydro-geomorphological response of natural and human-modified slopes and catchments. We invite research ranging from unsaturated zone, hillslope processes and regional hydrology which are applied to landslide research in a broad sense: ranging from soil slips, debris flows and to large scale deep-seated slope deformation. The session wishes to represent an opportunity for sharing and exchanging knowledge, approaches and achievements between experts and young scientists that may be useful in scheduling proper landslide risk prevention and mitigation strategies in human-modified catchments.

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Co-organized by HS13
Convener: Thom Bogaard | Co-conveners: Giacomo PepeECSECS, Massimiliano BordoniECSECS, Stella Moreiras, Roberto Greco
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| Attendance Thu, 07 May, 16:15–18:00 (CEST)
NH3.5

Debris flows are among the most dangerous natural hazards that threaten people and infrastructures in both mountainous and volcanic areas. The study of the initiation and of the dynamics of debris flows, along with the characterization of the associated erosion/deposition processes, is of paramount importance for hazard assessment, land-use planning and design of mitigation measures, including early warning systems.
A growing number of scientists with diverse backgrounds are studying debris flows and lahars. The difficulties in measuring parameters related to their initiation and propagation have progressively prompted research into a wide variety of laboratory experiments and monitoring studies. However, there is a need of improving the quality of instrumental observations that would provide knowledge for more accurate hazards maps and modeling. Nowadays, the combination of distributed sensor networks and remote sensing techniques represents a unique opportunity to gather direct observations of debris flows to better constrain their physical properties.
Scientists working in the field of debris flows are invited to present their recent advancements. In addition, contributions from practitioners and decision makers are also welcome. Topics of the session include: field studies and documentation, mechanics of debris-flow initiation and propagation, laboratory experiments, modeling, monitoring, hazard and risk assessment and mapping, early warning, and alarm systems.

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Co-organized by GM3/HS13
Convener: Marcel Hürlimann | Co-conveners: Velio Coviello (deceased)(deceased), Xiaojun Guo, Roland Kaitna
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| Attendance Tue, 05 May, 14:00–18:00 (CEST)
NH3.7

Landslides are ubiquitous geomorphological phenomena with potentially catastrophic consequences. In several countries, landslide mortality can be higher than that of any other natural hazard. Predicting landslides is a difficult task that is of both scientific interest and societal relevance that may help save lives and protect individual properties and collective resources. The session focuses on innovative methods and techniques to predict landslide occurrence, including the location, time, size, destructiveness of individual and multiple slope failures. All landslide types are considered, from fast rockfalls to rapid debris flows, from slow slides to very rapid rock avalanches. All geographical scales are considered, from the local to the global scale. Of interest are contributions investigating theoretical aspects of natural hazard prediction, with emphasis on landslide forecasting, including conceptual, mathematical, physical, statistical, numerical and computational problems, and applied contributions demonstrating, with examples, the possibility or the lack of a possibility to predict individual or multiple landslides, or specific landslide characteristics. Of particular interest are contributions aimed at: the evaluation of the quality of landslide forecasts; the comparison of the performance of different forecasting models; the use of landslide forecasts in operational systems; and investigations of the potential for the exploitation of new or emerging technologies e.g., monitoring, computational, Earth observation technologies, in order to improve our ability to predict landslides. We anticipate that the most relevant contributions will be collected in the special issue of an international journal.

Public information:
EGU Session NH3.7

Welcome to the Session NH3.7 on Space and Time Forecast of Landslides

The chat session will proceed by maintaining the original order provided by the session program. However, only the presentations with actually uploaded material will be listed in the session chat list.

Authors will be introduced In groups of 3 and will have 1-2 minutes each, in sequence, to briefly introduce their work by copy-pasting some brief sentences that summarise the research

Afterwards, there will be 5-6 minutes devoted to questions by the audience to the 3 authors. Since Q&A will concern 3 different presentations at the same time, we ask both presenters and questioners to always state who is the recipient of each question and each answer, to avoid confusion.
For example, a correct question style could be: “@MarkSmith: could you please say something more on the landslide database?”

Conveners, acting as session chairs and moderators, will signal when question time is over. They will also collect and resubmit possible questions that have gone unanswered during the chat, if possible.

After each round of 3 author presentations and Q&A, the conveners will introduce the next three speakers.

At the end of the list, if additional time remains, the conveners will open a final discussion on the general topics of the session and on integrated questions transversal to 2 or more presentations.

We remember that participants are encouraged to keep discussing mutual interests on research topics also after the Session, by emailing each other.
Please note that in the Session Displays page, each abstract has a link icon where it is possible to directly email the abstract main author.

Best
FC, XF, FG, BT

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Co-organized by GM4
Convener: Filippo Catani | Co-conveners: Xuanmei Fan, Fausto Guzzetti, Binod Tiwari