HS – Hydrological Sciences

Programme Group Chair: Alberto Viglione

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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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

HS2.1 –  Catchment hydrology in diverse climates and environments

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

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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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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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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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

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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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 session explores climate-resilient and equitable water resources management under growing climate and human pressures, focusing on Africa with broader global relevance. It highlights integrated governance, innovation, modelling, capacity development, and multi-stakeholder cooperation to translate science into policy and practice for sustainable and resilient water management.
Keywords: Africa, Groundwater management, Sustainability
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HS5.2 –  Human-Water Systems

Sub-Programme Group Scientific Officer: Christian Klassert

HS5.3 –  Water-Energy-Food-Ecosystem Nexus

Sub-Programme Group Scientific Officer: Christian Klassert

HS5.4 –  Urban Water Management

Sub-Programme Group Scientific Officer: Christian Klassert

HS6 –  Remote sensing and data assimilation

Sub-Programme Group Scientific Officer: Neda Abbasi

Proposals are marked in red.

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
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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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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

HS8.3 –  Subsurface hydrology – Vadose zone hydrology

Sub-Programme Group Scientific Officer: Linda Luquot

HS9 –  Erosion, sedimentation & river processes

Sub-Programme Group Scientific Officer: Ivan Lizaga

Proposals are marked in red.

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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