HS – Hydrological Sciences

Programme Group Chair: Alberto Viglione

Inter- and transdisciplinary sessions led by HS

Session short summary:
This session integrates natural and social sciences with policy and practice to address climate resilience. It combines climate science, hydrology, agriculture, governance, local knowledge and capacity development, bringing together researchers, practitioners and policymakers to co-create locally relevant solutions through equitable African–European partnerships.
Keywords: Africa, Climate change - adaptation
Inter- and Transdisciplinary Sessions suggestion led by: HS | Hydrological Sciences
Co-organization suggestions:
CL | Climate: Past, Present & Future
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Disciplinary sessions of HS

HS1 –  General Hydrology

Sub-Programme Group Scientific Officers: Alberto Viglione, Ilias Pechlivanidis

Proposals are marked in red.

Session short summary:
This session focuses on the small-scale transport processes of macro-, micro- and nano-plastics across aquatic environments. Presentations will showcase laboratory, field and modelling efforts to understand plastic transport, considering particle physical properties (size, shape, density), environmental factors (flow, turbulence and salinity) and bio-chemical processes (biofouling and aggregation)
Keywords: Groundwater, Microplastic, Plastic, River processes, Sediment transport
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Session short summary:
Hydrological systems are driven by climate change and human activity, yet key interactions within the terrestrial water cycle remain uncertain. This session invites submissions on observing, modeling, and projecting hydrological processes, extremes, and human impacts across scales.
Keywords: Catchment hydrology - surface, Climate change - hydrologic impact, Climate extremes, Ecohydrology, Water cycle
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Session short summary:
This session provides a platform to discuss which gaps remain between current and recommended modelling practices in hydrology, and how such gaps may be bridged. We invite abstracts that focus on the theoretical, technical, social aspects of model application, and those that look toward the future to answer the question: “Where are we today, and where do we want to be tomorrow?”
Keywords: Model uncertainty, Model validation, Model verification, Modelling - Hydrology
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HS1.1 –  Teaching hydrology

Sub-Programme Group Scientific Officers: Alberto Viglione, Ilias Pechlivanidis

HS1.2 –  Cross-cutting hydrological sessions

Sub-Programme Group Scientific Officers: Alberto Viglione, Ilias Pechlivanidis

HS2 –  Catchment hydrology

Sub-Programme Group Scientific Officers: Bastien Dieppois, Diana Spieler

Proposals are marked in red.

Session short summary:
Earth’s Critical Zone (CZ), where hydrology, geology, ecology, and society intersect, is essential for sustaining life and maintaining environmental health. This session will showcase CZ science, CZ methodologies, and the collaborative efforts of CZ networks from around the world.
Keywords: Catchment hydrology - surface, Ecohydrology
Co-organization suggestions:
BG | Biogeosciences
SSS | Soil System Sciences
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HS2.1 –  Catchment hydrology in diverse climates and environments

Sub-Programme Group Scientific Officers: Bastien Dieppois, Diana Spieler

Proposals are marked in red.

Suggested session
Snow and glacier hydrology
Session short summary:
Snow and glaciers represent important components of the water cycle in many regions worldwide. Climate change will strongly affect the hydrological regimes of these catchments, yet quantifying these impacts remains challenging. This session welcomes experimental and modelling studies advancing our understanding of the role of snow and glaciers for hydrology in a changing climate.
Keywords: Catchment hydrology - surface, Climate change - impact on cryosphere, Experimental hydrology, Glaciers (Glaciation), Snow
Co-organization suggestions:
CR | Cryospheric Sciences
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HS2.2 –  From observations to concepts to models (in catchment hydrology)

Sub-Programme Group Scientific Officers: Bastien Dieppois, Diana Spieler

Proposals are marked in red.

Session short summary:
All hydrology is local, and no catchment behavior is average, which often challenges one-size-fits all modelling approaches and regionalization. Inviting contributions that place the modelling case study, its uniqueness and diversity at the center, this session argues that careful examination of the specific is one of the most powerful ways to advance our general understanding of hydrology.
Keywords: Hydroclimatic variability, Hydrological patterns, Model uncertainty, Modelling - Hydrology
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Session short summary:
We invite abstracts with novel applications and recent developments of isotope and other tracer techniques in hydrological field studies and data driven or physical modelling in the areas of surface water-groundwater interactions, unsaturated and saturated zone, rainfall-runoff processes, cold-region hydrology, nutrient or contaminant transport, ecohydrology or other catchment processes.
Keywords: Catchment hydrology - subsurface, Catchment hydrology - surface, Isotope hydrology, Tracer hydrology
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Session short summary:
Hydrological synthesis represents efforts to combine components or elements of existing knowledge to form a connected whole. These connections may be across geographic locations and scales, or across temporal windows and scales. This session will focus on the investigation of similarities and patterns among catchment hydrological responses and processes.
Keywords: Catchment hydrology - groundwater, Catchment hydrology - surface, Hydrological patterns
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Session short summary:
Catchment hydrology has focused more on surface runoff, while subsurface processes like storage dynamics, subsurface flow and role of soil moisture remain under-researched. This session aims to fill these gaps by discussing observations, modeling, and the broader understanding of hydrologic systems.
Keywords: Catchment hydrology - subsurface, Modelling - Hydrology, Rainfall-runoff (Precipitation run-off), Soil hydrology, Subsurface hydrology
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HS2.3 –  Water quality at the catchment scale

Sub-Programme Group Scientific Officers: Bastien Dieppois, Diana Spieler

Proposals are marked in red.

Session short summary:
This session invites contributions on experimental and modeling studies to improve prediction and management of water quality, effective monitoring schemes, innovative strategies, advanced modeling tools, and catchment management measures.
Keywords: Catchment hydrology - surface, Ecohydrology, Nutrient cycling, Solute transport, Water quality
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Session short summary:
This session leverages recent advances in measurements of water quality and stream ecology to improve scientific understanding of freshwater ecosystems and their catchments and to improve monitoring, management and mitigation strategies.
Keywords: Catchment management, Climate change - hydrologic impact, Freshwater environments, Nutrient cycling, Water quality
Co-organization suggestions:
BG4 | Marine and Freshwater Biogeosciences
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Session short summary:
Understanding the impacts of global changes on clean water availability is important for ensuring that there is enough water of suitable quality to meet human and ecosystem needs. This session broadly focuses on topics covering impacts of climate and socio-economic changes on water quality.
Keywords: Climate change - hydrologic impact, Freshwater environments, Water quality, Water scarcity
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Session short summary:
Water temperature and its extremes affect both ecosystems and society. We want to bring together researchers focusing on rivers, streams, lakes, reservoirs, soil and groundwater to learn about natural and anthropogenic drivers of variability in and changes of freshwater temperature. We welcome submissions in all spatial and temporal scales and methodologies from fieldwork to modelling.
Keywords: Freshwater environments, High-temperature, Water quality
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Session short summary:
The focus of this session is on water quality issues caused by organic (e.g. pesticides, pharmaceuticals, PFAS) and inorganic (e.g. heavy metals) micropollutants at catchment scale. Invited are contributions about monitoring schemes, simulation tools, experimental studies and mitigation measures.
Keywords: Catchment hydrology - surface, Contaminant hydrology, Risk Mitigation, Soil pollution, Water quality
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HS2.4 –  Hydrologic variability and change at multiple scales

Sub-Programme Group Scientific Officers: Bastien Dieppois, Diana Spieler

Proposals are marked in red.

Session short summary:
Floods and droughts have major impacts on society and ecosystems and are projected to become more frequent and severe with climate change. This session seeks to unite the flood and drought research communities by studying the similarities in their processes and study approaches to identify synergies.
Keywords: Catchment hydrology - surface, Drought, Flood hazard (Flood risk)
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Session short summary:
This session explores how internal climate variability (e.g., ENSO, NAO, AMO) influences hydrological systems, water resources, floods and droughts, and interacts with climate change, catchment properties and land use. We welcome studies using observations, models and large ensembles, including probabilistic projections and plausible storyline approaches.
Keywords: Climate change - hydrologic impact, Climate variability, Drought, Flood hazard (Flood risk), Hydrological patterns
Co-organization suggestions:
CL3.1 | Future Climate – Climate Change: From Regional to Global
NH1 | Hydro-Meteorological Hazards
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HS2.5 –  Global and (sub)continental hydrology

Sub-Programme Group Scientific Officers: Bastien Dieppois, Diana Spieler

HS3 –  Hydroinformatics

Sub-Programme Group Scientific Officer: Gerald A Corzo P

Proposals are marked in red.

Session short summary:
This session highlights the development, evaluation, integration, and application of precipitation and evapotranspiration datasets for hydrological studies. It welcomes contributions addressing topics such as, but not limited to, dataset benchmarking, uncertainty analysis, AI methods, data integration techniques, and applications.
Keywords: Data Science, Hydroclimatic variability, Hydroinformatics, Uncertainty analysis, Water cycle
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Session short summary:
This PICO session explores how the choice, quality, scale and integration of hydro-meteorological data influence hydrological modelling and the assessment of extremes. It connects global products with local observations and emerging data-driven methods to improve robust hydrological knowledge and risk-informed decision-making.
Keywords: Climate extremes, Data assimilation, Hydrometeorology
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Session short summary:
Hydroinformatics explores how data science, numerical modeling, and computational intelligence are transforming water resources systems. We invite contributions across the full spectrum of hydrology, particularly those applying machine learning, remote sensing, IoT sensor streams, or climate projections to advance environmental forecasting and smart water infrastructure.
Keywords: Big data - analyses, Hydroinformatics, Internet of Things, Machine Learning, Modelling - Hydrology
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Session short summary:
This session focuses on statistical, machine learning, and hybrid approaches for analysing and forecasting hydrological time series. We welcome applications across surface and subsurface hydrology, including streamflow, groundwater, soil moisture, and water quality, with particular interest in interpretability, transferability, and robustness under changing and extreme conditions.
Keywords: Climate change - hydrologic impact, Groundwater, Hydrological forecasting, Surface water
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HS4 –  Hydrological forecasting

Sub-Programme Group Scientific Officer: Louise Slater

Proposals are marked in red.

Session short summary:
The session aims to highlight and bring together recent efforts in hydrological forecasting, using machine learning and/or hybrid approaches. We welcome examples of model developments (from implementations to operational setups), studies at local to global scales and short-, medium- and long-term horizons, as well as data-driven/hybrid approaches to tackle challenges in hydrological forecasting.
Keywords: Artificial Intelligence, Hydrological forecasting, Machine Learning, Modelling - Hydrology
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Session short summary:
This session explores advances in hydrological forecasting, addressing key hydrological variables while considering both natural processes and human activities. Topics include novel data generation, advanced modelling of extremes, forecasting methods, quantitative analysis of human impacts, impact-based risk assessments, uncertainty quantifications, and effective communication for early warnings.
Keywords: Data Science, Hydrological forecasting, Modelling - Hydrology, Risk/hazard Assessment (identification, Analysis and Evaluation) , human-natural systems
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Session short summary:
This interactive session bridges research and practice in operational forecasting for climate and water hazards, including floods and droughts. It explores multi-hazard early warning systems, physically-based modelling, AI, and co-designed solutions for risk management needs. Scientists and practitioners are invited to share real-world case studies across local, national, and global scales.
Keywords: Artificial Intelligence, Disaster risk management, Early warning systems, Hydrological forecasting, Multi-hazard (management, assessments, models)
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Session short summary:
Flood forecasting protects communities from rising waters caused by climate change and city growth. The technology—like satellite data, faster computer models, smart sensors, and AI—helps experts predict floods well in advance. The new ways to forecast floods,manage dams, and flood inundation maps helps people faster to save lives and property worldwide.
Keywords: Disaster risk management, Flood forecasting, Flood hazard (Flood risk), Hydrological forecasting, Supercomputer
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Session short summary:
This session focuses on monitoring and forecasting drought, low flows and consequent water scarcity. Contributions discuss advances in monitoring and modelling; how droughts evolve and propagate; impacts on society and ecosystems; and support for decision-making and policy to reduce drought risk.
Keywords: Drought, Early warning systems, Hydrological forecasting, Risk/hazard scenarios modeling and forecasting, Water scarcity
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Session short summary:
Water-dependent sectors (water supply, energy, agriculture) are challenged by climate variability, extremes and long-term water-cycle change. Improving resilience requires sub-seasonal to decadal predictions and scenario projections of water availability and extremes. Equally important is co-developing hydro-climate services that translate forecasts into actionable information for practitioners.
Keywords: Hydroclimatic variability, Hydrological forecasting, Predictability, Water cycle, Water management (Water services)
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HS5 –  Water and society

Sub-Programme Group Scientific Officer: Christian Klassert

HS5.1 –  Water Resources Policy and Management under Uncertainty

Sub-Programme Group Scientific Officer: Christian Klassert

Proposals are marked in red.

Session short summary:
This interdisciplinary session bridges hydrology, decision science, systems analysis, and water governance to advance adaptive and robust water management. It welcomes methodological advances and real-world applications of Decision Making Under Deep Uncertainty approaches to address the complex interactions shaping human-water systems.
Keywords: Climate change - adaptation, Uncertainty analysis, Water management (Water services), human-natural systems
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Session short summary:
This session explores how water science, governance, innovation, local knowledge and cooperation can bridge the gap between science, policy and implementation. It brings together interdisciplinary perspectives to identify equitable, climate-resilient pathways from water science to water security, strengthening the science–policy–practice interface.
Keywords: Africa, Climate variability, Sustainability, Water policy
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HS5.2 –  Human-Water Systems

Sub-Programme Group Scientific Officer: Christian Klassert

Proposals are marked in red.

Suggested session
Human-Water Feedbacks
Session short summary:
This session welcomes abstracts that consider how to observe, analyse and model feedbacks of people and water, and the effects of social and environmental changes on hydrological systems. It is organised by the International Commission on Human-Water Feedbacks (ICHWF) of the IAHS.
Keywords: Anthropogenic effects, Climate change - hydrologic impact, Feedback processes, Precipitation extreme events (Extreme rainfall events), human-natural systems
Co-organization suggestions:
CL3.2 | Future Climate – Climate and Society
NH9 | Natural Hazards & Society
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Session short summary:
Socio-hydrology and hydro-social research emerged to better understand the dynamic feedbacks within coupled human-water systems and its implications for water management and associated risks. We welcome contributions from social and natural sciences researchers who like to look beyond their research perspective and like to discuss their findings in a broader context of coupled human water systems.
Keywords: Drought, Flood hazard (Flood risk), Resilience, Water management (Water services), human-natural systems
Co-organization suggestions:
NH9 | Natural Hazards & Society
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Session short summary:
This annual session aims to improve understanding and management of transboundary water systems amid changing climate and hydrological regimes, with a focus on shared aquifers, shrinking glaciers, and drying lakes and rivers. We invite studies that integrate hydrological observations, modeling, remote sensing, hydropower and irrigation operations, and Water–Energy–Food–Ecosystem nexus dynamics.
Keywords: Climate change - hydrologic impact, Environmental crisis, River management, Water management (Water services), Water scarcity
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Session short summary:
This session explores ancient and traditional hydraulic systems as hydrosocial archives of human–water interactions. Their design, use, maintenance, and social dynamics reveal lessons for sustainable water management, resilience, and climate adaptation. Contributions may address geospatial technologies, water stress and quality, coupled human–water systems, and knowledge transfer.
Keywords: Climate change - adaptation, Sustainability, Water infrastructures, Water quality, Water scarcity
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Session short summary:
This session explores how climate change, hydroclimatic extremes, and growing water demands affect natural and human-made water storage systems. It highlights innovative approaches, including remote sensing, AI, modeling, digital twins, and decision-support tools, for monitoring, adaptive operation, sustainable management, and resilient basin-scale water storage.
Keywords: Climate change - adaptation, Hydroclimatic variability, Sustainability, Water infrastructures, Water supply management
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HS5.3 –  Water-Energy-Food-Ecosystem Nexus

Sub-Programme Group Scientific Officer: Christian Klassert

Proposals are marked in red.

Session short summary:
This session solicits academics and practitioners contributions that explore the use of hydropower and storage technologies to support the transition to low-carbon electricity systems. We encourage interdisciplinary teams of hydrologists, meteorologists, ecologist, power system engineers, and economists to present case studies and discuss collaboration with environmental and energy policymakers.
Keywords: Climate change - adaptation, Ecohydrology, Renewable energy, River catchment, Water infrastructures
Co-organization suggestions:
ERE2 | Renewable energy
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HS5.4 –  Urban Water Management

Sub-Programme Group Scientific Officer: Christian Klassert

Proposals are marked in red.

Session short summary:
This session focuses on catchment functioning, water quantity and quality issues, monitoring and data challenges, and hydrological and ecological processes in urban and urbanizing watersheds.
Keywords: Catchment management, Urban hydrology, Water quality
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HS6 –  Remote sensing and data assimilation

Sub-Programme Group Scientific Officer: Neda Abbasi

Proposals are marked in red.

Session short summary:
The session will focus on the use of remote sensing data combined with physically based hydrological modelling or machine learning methods to quantify the actual irrigation volumes or to improve the management of irrigation and water use efficiency, at multiple scales from field to large irrigated areas.
Keywords: Irrigation, Soil moisture, Water cycle
Co-organization suggestions:
SSS | Soil System Sciences
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Session short summary:
This session presents new developments that support the use of remote sensing (RS) data for water-management applications, from local to global scales. Our research aims to improve the quality and usability of RS products, enhanced assessments of river discharge, lake and reservoir volumes, and groundwater resources; drought monitoring and modelling and its impacts on water-stressed vegetation
Keywords: Remote Sensing - Biosphere, Water cycle
Co-organization suggestions:
ESSI2 | Data, Software and Computing Infrastructures across Earth and Space Sciences
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Session short summary:
This session presents recent advances in remote sensing of hydrological cycle components and their applications in hydrological modelling.
Keywords: Ecohydrology, Modelling - Hydrology, Precipitation remote sensing (Rainfall remote sensing), Remote Sensing - Cryosphere, Satellite time series
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Session short summary:
This session explores AI, remote sensing, and digital twins for real-time monitoring, forecasting, risk assessment, and management of extreme rainfall and floods, including early warning, decision support, impact analysis, and mitigation strategies.
Keywords: Digital terrain analysis, Flood hazard (Flood risk), Precipitation remote sensing (Rainfall remote sensing), Satellite time series, Water management (Water services)
Co-organization suggestions:
ESSI | Earth & Space Science Informatics
SSS | Soil System Sciences
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Session short summary:
This session explores how remote sensing and AI are transforming agricultural water management under increasing climate variability. Topics span Earth observation, AI-driven water stress and yield prediction, precision irrigation, sensor data fusion, forecasting models, and emerging digital twin/LLM applications- highlighting scalable solutions for climate-resilient agriculture.
Keywords: Agriculture, Artificial Intelligence, Climate change - hydrologic impact, Ground-based remote sensing, Water management (Water services)
Co-organization suggestions:
AS1 | Meteorology
ESSI1 | Next-Generation Analytics for Scientific Discovery: Data Science, Machine Learning, AI
NH6 | Remote Sensing, AI, data science & Hazards
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Session short summary:
Covering >20 million km², the Pan Third Pole is Earth’s largest high‑altitude non‑polar region and highly sensitive to warming. This session invites integrated observational and modeling studies on atmosphere–cryosphere–hydrosphere–biosphere interactions and global‑change feedbacks, aiming to reduce uncertainties and enhance predictive capacity for this vulnerable region.
Keywords: Climate change - impact on cryosphere, Hydrometeorology, Land-atmosphere interactions, Numerical weather prediction, Remote Sensing - Cryosphere
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Session short summary:
We focus on recent advances in RS of ET, including AI-enabled approaches, data integration, validation, uncertainty quantification& next-generation Earth observation technologies. This forum is for researchers and practitioners to explore innovative methods and applications that improve understanding of water dynamics and support sustainable water and ecosystem management in a changing climate.
Keywords: Evapotranspiration, Remote Sensing - Biosphere, Soil water measurement, Water cycle
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HS7 –  Precipitation and climate

Sub-Programme Group Scientific Officer: Elena Cristiano

Proposals are marked in red.

Session short summary:
This session focuses on high-resolution precipitation and hydrological measurements in cities and on approaches to improve modeling of urban hydrological response.
Keywords: Nowcasting, Precipitation extreme events (Extreme rainfall events), Precipitation measurements (Rainfall measurements), Precipitation modelling (Rainfall modelling), Urban hydrology
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Session short summary:
This session welcomes submissions that investigate the impact and uncertainty of climate scenarios on hydrological modelling, such as floods and drought prediction and change attribution.
Keywords: Climate change - hydrologic impact, Hydroclimatic variability, Risk/hazard scenarios modeling and forecasting, Stochastic hydrology, Uncertainty analysis
Co-organization suggestions:
NH1 | Hydro-Meteorological Hazards
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Session short summary:
Precipitation variability from drop scale to catchment scale : measurement, processes and hydrological applications
Keywords: Precipitation estimate (Rainfall estimate), Precipitation extreme events (Extreme rainfall events), Precipitation measurements (Rainfall measurements), Precipitation modelling (Rainfall modelling), Precipitation variability (Rainfall variability)
Co-organization suggestions:
AS1 | Meteorology
NP3 | Scales, Scaling and Nonlinear Variability
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Session short summary:
This session explores advances in precipitation modelling, variability, and uncertainty across spatial and temporal scales. Topics include process representation, multi-source precipitation products, ensemble forecasting, machine learning, downscaling, scaling properties, and methods to improve precipitation estimation and prediction under climate variability and change.
Keywords: Downscaling, Machine Learning, Precipitation modelling (Rainfall modelling), Precipitation variability (Rainfall variability), Uncertainty analysis
Co-organization suggestions:
AS | Atmospheric Sciences
CL | Climate: Past, Present & Future
NP | Nonlinear Processes in Geosciences
Title suggestion: Multi-Source Precipitation and Hydroclimatic Data Fusion: From Uncertainty to Decision-Ready Hydrological Applications
Description suggestion: ccurate precipi[…]
Convener suggestion: Seokhyeon Kim, Luca Brocca, Ashish Sharma, Rocky Talchabhadel, Suraj Shah
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Session short summary:
Hydroclimatic extremes such as floods, droughts, storms and heatwaves often occur over large areas and cluster in time, increasing impacts and risk. This session welcomes advances in understanding, modelling and predicting these events, including compound extremes, dependence structures, uncertainty quantification, physical drivers and risk assessment.
Keywords: Climate extremes, Hydroclimatic variability, Precipitation modelling (Rainfall modelling)
Co-organization suggestions:
NH1 | Hydro-Meteorological Hazards
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Session short summary:
This session collects advances in rainfall modelling for engineering design: new theory, physically based frameworks, statistical and stochastic models, radar and satellite observations, convection-permitting simulations, and hybrid methods. Contributions span sub-hourly to multi-day durations and point-to-areal scales, advancing IDF or DDF estimation for gauged, ungauged, and changing conditions.
Keywords: Civil engineering, Climate change - hydrologic impact, Precipitation extreme events (Extreme rainfall events), Scaling, Stochastic hydrology
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Session short summary:
Extreme hydro-meteorological events drive many hydrologic and geomorphic hazards, such as floods and landslides, which pose a threat to modern societies on a global scale. This session aims at gathering contributions dealing with said hazards, that address the aspects of vulnerability analysis, risk estimation, impact assessment, mitigation policies and communication strategies.
Keywords: Flood hazard (Flood risk), Hydrometeorology, Precipitation extreme events (Extreme rainfall events), Risk/hazard Assessment (identification, Analysis and Evaluation) , Vulnerability/damage assessment
Co-organization suggestions:
NH1 | Hydro-Meteorological Hazards
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HS8 –  Subsurface Hydrodrology

Sub-Programme Group Scientific Officer: Linda Luquot

Proposals are marked in red.

Session short summary:
Fractured-porous media and karst systems remain highly challenging systems to study due to heterogeneity and scale effects. This session welcomes studies on flow and (reactive) transport, from pore to field scale, including advances in field and laboratory methods, modeling, and applications in resource management, geothermal, mining, and environmental risk assessment.
Keywords: Faults and Fractures, Groundwater, Karst processes, Solute transport, Vadose zone (Unsaturated groundwater zone)
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HS8.1 –  Subsurface hydrology – Transport processes & Groundwater Quality

Sub-Programme Group Scientific Officer: Linda Luquot

Proposals are marked in red.

Session short summary:
Natural and engineered particles as well as biocolloids are of great concern because of their potential adverse effects on ecosystem functions, wildlife and human health. They can alter the transport properties of dissolved contaminants and change the hydraulic properties of subsurface systems.
Keywords: Contaminant hydrology, Ecohydrology, Human health, Solute transport, Subsurface hydrology
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HS8.2 –  Subsurface hydrology – Groundwater

Sub-Programme Group Scientific Officer: Linda Luquot

Proposals are marked in red.

Session short summary:
This session explores the quantitative and qualitative impacts of extreme hydroclimatic events on groundwater systems' dynamics. The session brings together field observations, groundwater modelling frameworks and management solutions for improving groundwater security under climate change and increasing anthropogenic pressures.
Keywords: Climate change - hydrologic impact, Groundwater, Groundwater management, Groundwater recharge, Water quality
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Suggested session
Large-scale groundwater
Session short summary:
This session explores large-scale groundwater availability, quality and dynamics, focusing on surface-groundwater exchanges and their impacts for humans and ecosystems. By highlighting advances in global models, big data, machine learning, and monitoring, it addresses barriers to regional and global groundwater understanding with implications for groundwater management, policy, and sustainability.
Keywords: Big data - analyses, Groundwater management, Groundwater recharge, Groundwater-surface water exchange, Modelling - Hydrology
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Session short summary:
Groundwater recharge is a complex process within the water cycle, studied from many angles across the hydrological sciences. This session brings together researchers on recharge estimation, previously scattered across groundwater management, modeling, vadose zone, and agriculture sessions, to exchange ideas and foster collaboration, building on a successful oral and poster session at EGU26.
Keywords: Groundwater management, Groundwater recharge, Irrigation, Subsurface hydrology, Vadose zone (Unsaturated groundwater zone)
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Session short summary:
This session explores groundwater dating, aquifer management, and innovative tracers for sustainable water use. Presentations on new or uncommon tracers are welcome.
Keywords: Catchment hydrology - groundwater, Groundwater, Groundwater management, Groundwater recharge, Tracer hydrology
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HS8.3 –  Subsurface hydrology – Vadose zone hydrology

Sub-Programme Group Scientific Officer: Linda Luquot

Proposals are marked in red.

Session short summary:
Constitutive laws, and soil physical and hydrological properties, as the physical hearth of soil water modelling stimulate an interdisciplinary discussion between hydrology, soil physics, agriculture and geotechnics, in the framework of the continuum approach and contributing to define its limits.
Keywords: Soil hydrology, Soil management in agriculture, Soil moisture, Soil water measurement, Vadose zone (Unsaturated groundwater zone)
Co-organization suggestions:
BG3 | Terrestrial Biogeosciences
SSS6 | Soil Physics
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HS9 –  Erosion, sedimentation & river processes

Sub-Programme Group Scientific Officer: Ivan Lizaga

Proposals are marked in red.

Session short summary:
This session proposal focuses on the transfer of sediments and associated contaminants in freshwater ecosystems. It explores their sources, transport, storage, and remobilization across various temporal and spatial scales. The session addresses how these processes, influenced by complex non-linear dynamics and human activities, impact water quality, habitats, and biogeochemical cycles.
Keywords: Catchment management, Contaminant hydrology, Fluvial systems (River systems), Lakes, Sediment pollution
Co-organization suggestions:
GM5 | Erosion, Sediments, Weathering, and Landscapes
SSS2 | Soil Erosion and Conservation
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Session short summary:
This session explores sedimentary archives from lakes, wetlands, reservoirs and fluvial systems to reconstruct human–climate–environment interactions during the Anthropocene, including environmental disturbances, long-term trajectories, legacy effects, and ecosystem resilience and recovery.
Keywords: Anthropocene, Environmental changes (Environmental variability), Landscape dynamics, Sediment pollution, Sediments (Sedimentation / Deposition)
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Session short summary:
Quantitative information on the spatial pattern of erosion and sediment sources in catchments is required to understand the processes controlling these transfers and to design control measures. Sediment tracing techniques, among others, have contributed to provide this information. However, their widespread application is limited by challenges that will be addressed in this session.
Keywords: Anthropocene, Contaminant monitoring, Sediment budget, Sediment dynamics, Soil erosion
Co-organization suggestions:
GM | Geomorphology
SSS | Soil System Sciences
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HS10 –  Ecohydrology and Limnology

Sub-Programme Group Scientific Officer: Miriam Coenders-Gerrits

Proposals are marked in red.

Session short summary:
Ecohydrological processes are increasingly influenced by frequent, prolonged, and severe droughts under climate and land surface changes. This session welcomes studies using observations, models, and concepts to explore mechanisms, trends, resilience, and impacts of drought responses, aiming to inform adaptation strategies in a changing environment.
Keywords: Climate change - hydrologic impact, Drought, Ecohydrology, Resilience, Sustainability
Co-organization suggestions:
BG3 | Terrestrial Biogeosciences
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Session short summary:
Spatially heterogeneous topography, soils, vegetation, and climate organize water, carbon, and nutrient fluxes and storages. This session welcome abstracts using observations, experiments, and modelling to examine how spatial heterogeneity shape ecohydrological and biogeochemical processes, such as carbon and nutrient cycling, element export, formation of hotspots, and responses to climate change.
Keywords: Biogeochemical modelling, Carbon cycle - Biosphere, Ecohydrology, Spatial variability
Co-organization suggestions:
BG3 | Terrestrial Biogeosciences
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Session short summary:
Water presence does not guarantee water access. This session examines how storage, connectivity, salinity, water age, roots, and human interventions determine water accessibility to plants, ecosystems, recharge, and society, linking observations and models to mechanisms, thresholds, and functional outcomes.
Keywords: Catchment hydrology - groundwater, Connectivity, Ecohydrology, Groundwater management, Soil hydrology
Co-organization suggestions:
BG3 | Terrestrial Biogeosciences
SSS6 | Soil Physics
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Session short summary:
The session focuses on vegetation-snow-water interactions in seasonally and perennially snow-dominated mountain regions across the globe, where runoff generation depends on the seasonality of melt and its interaction with vegetation, soil and water bodies. We welcome contributions addressing the monitoring and modelling of process interactions and its integration into modelling frameworks.
Keywords: Atmosphere-biosphere interactions, Climate change - hydrologic impact, Ecohydrology, Plant-soil systems (plant-soil interactions), Snow hydrology
Co-organization suggestions:
BG3 | Terrestrial Biogeosciences
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Session short summary:
Lakes and reservoirs increasingly shift among open water, contracted, dry and reflooded states. These transitions alter hydrological connectivity, sediment-water exchanges and biogeochemical processing, with consequences for water quality and ecosystem function. We invite observations, experiments, remote sensing and models addressing mechanisms, thresholds, recovery and management.
Keywords: Biogeochemical processes - aquatic, Climate extremes, Contaminant hydrology, Planetary remote sensing, Water quality
Co-organization suggestions:
BG4 | Marine and Freshwater Biogeosciences
CL2 | Present Climate – Historical and Direct Observations
GD5 | Modelling, Inversion, Data Assimilation, Multiscale and Multiphysics Methods for Geodynamics 
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Suggested session
General Ecohydrology
Session short summary:
This session explores novel results and methods in ecohydrology. We encourage contributions related coupled ecological, biogeochemical, and hydrological processes, at scales from the single organ or organisms to whole ecosystems/catchments. Contributions from terrestrial and aquatic systems are welcome, including those relative to managed ecosystems.
Keywords: Biogeochemical processes - aquatic, Biogeochemical processes - terrestrial, Ecohydrology, Plant-soil systems (plant-soil interactions), Water cycle
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Session short summary:
This session focuses on the large variety of methods for estimating evapotranspiration from in-situ measurements. We will also look at the challenges of comparing and scaling these estimates while addressing uncertainties and representativeness.
Keywords: Evapotranspiration, Land-atmosphere interactions, Scaling, Uncertainty analysis, Water cycle
Co-organization suggestions:
BG | Biogeosciences
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Session short summary:
Stable isotopes are valuable for tracing water and nutrient fluxes in the soil-plant-atmosphere system. We seek studies on isotope tracer methods that enhance understanding of water and nutrient movement across scales. Our session covers both innovative data interpretations and model applications.
Keywords: Ecohydrology, Experimental hydrology, Isotope hydrology, Modelling - Hydrology, Plant-soil systems (plant-soil interactions)
Co-organization suggestions:
BG4 | Marine and Freshwater Biogeosciences
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Session short summary:
Ecohydrology and plant hydraulics share substantial conceptual overlap, yet communication between the communities remains limited. This session bridges this gap through interdisciplinary studies of vegetation–water interactions, plant hydraulic traits, complex landscapes, and plant-to-catchment dynamics. Contributions should highlight advances in theory, observations, scaling, or modelling.
Keywords: Ecohydrology, Ecophysiology, Scaling
Co-organization suggestions:
BG10 | Interdisciplinary topics in Biogeosciences
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