SEARCHING: IAHS



H01 Panta Rhei Synthesis: Change in Hydrology and Society

Convener(s): Heidi Kreibich (Panta Rhei, Germany)

Co-Convener(s): Fuqiang Tian (Panta Rhei, China) Giuliano Di Baldassarre (Panta Rhei, Sweden) Hilary McMillan (Panta Rhei, USA) Alberto Montanari (Panta Rhei, Italy)

Description

The IAHS decade “Panta Rhei - Everything Flows” (2013-2023) was dedicated to increasing our knowledge of the interplay between hydrology and society. Research was focused on processes and drivers of change in the water cycle with a strong consideration of the interactions and feedbacks with changing human systems. The general objective was to improve our descriptions and predictions of water resources dynamics to support sustainable development under global change conditions. At the end of this Panta Rhei decade, it is time to synthesize the achievements and reflect together about the remaining challenges. 

This symposium welcomes contributions about the following topics:

  • New data or data acquisition approaches to describe the interplay between hydrology and society
  • Assessment of interactions and feedbacks between communities and local water resources
  • Evaluations of water management interventions and disaster risk reduction actions, including unintended consequences or undesired effects at local, region, and global scales
  • Analysis of human influence on and/or adaptation to hydrological extremes
  • Integrated models or sociohydrological analyses of fully coupled human-water systems
  • Local, regional and global modeling of hydrologic and socio-economic change
  • Case studies from Panta Rhei working groups, IAHS Commissions and beyond




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H02 Detecting the Impacts of Water Management on the Spatial and Temporal Pattern of Natural Water Resources Via Observations, Models and Remote Sensing

Convener(s): Suxia Liu (ICWRS, China)

Co-Convener(s): Yonca Cavus (ICSW, Turkey) María J. Polo (ICRS, Spain) Felipe de Barros (ICWQ, Brazil) Moctar Dembélé (ICSW, Burkina Faso)

Description
Human activities are more and more severely changing the spatial and temporal pattern of natural water resources via many management actions such as long-distance water transfer, dams, irrigation, water and soil conservation, among others. Quantifying these impacts is very important for decision makers to plan the future management of water resources in a sustainable way and to reduce harmful impacts of such management activities for existing water resources systems. Challenges are posed due to a lack of data for the quantification and insufficient models to forecast such impacts. Specific monitoring strategies are required to set up adequate models. Remote sensing as part of earth observations (EO) provides useful tools for the estimation of human-induced changes in water supply and demand. This symposium will focus on monitoring systems and water balance models suitable to develop recommendations for water management planning and operations to mitigate harmful impacts of water resources systems, particularly models that integrate across multiple disciplines (e.g. hydrology, social science, economics and ecology). Special emphasis is given to multi-mission satellite earth observation products in their combination with ground-based monitoring of water resources at a regional scale.



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H03 Floods: Processes, Forecasts, Probabilities, Impact Assessments and Management

Convener(s): Svenja Fischer (ICSH, Germany)

Co-Convener(s): Andreas Schumann (ICWRS, Germany) Günter Blöschl (IAGS PP, Austria) Elena Volpi (ICSH, Italy) Christopher J. White (ICCLAS, UK)

Description

One main aspect of the direct socio-economic relevance of hydrology consists in its ability to predict or to forecast extreme flood events. Prediction refers to the assessment of the probability of a value related to the flood (e.g., the maximum peak discharge during one event) to be exceeded, without specifying the time of occurrence. Forecast refers to a statement of the future development of a variable related to the flood with a specification of the time of occurrence. With regard to their impacts, floods play a very important role for the society in general and human beings living in flood prone areas in particular. Because of missing information and a short memory of harmful events in the past, the public awareness of floods is often low and flood prevention and protection are insufficient in many parts of the world. Existing tools and methods for flood prediction and forecast may be outdated, as new problems have to be considered, e.g., by increases of:

  • uncertainties, caused by climate change and human impacts,
  • changing flood regimes, caused by climate variabilities,
  • relevance of interlinks between atmosphere and river basins in the formation of extreme floods,
  • risks, resulting by the concentration of people and values in river valleys,
  • demand for more reliable and more complex hydrological data for flood design,
  • complexity of flood protection at the river basin scale, where one human intervention may affect the impacts of existing or planned measures in not foreseeable ways and so on.

This session welcomes contributions to various aspects of floods, including but not exclusively processes of flood generation, the assessments of flood probabilities, regionalisation issues, flood forecasting and the need for impact forecasts and other economic aspects of risk management. We encourage submissions that link to the Unsolved Problems in Hydrology (UPH) initiative.



Solicited speaker: Salvatore Grimaldi (University of Tuscia, Italy)

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H04 Diminishing Lakes and Wetlands: Causes Behind the Process and Actions for Recovery

Convener(s): David Hannah (ICSW, UK)

Co-Convener(s): Gil Mahe (ICSW, France) Yonca Cavus (ICSW, Turkey) Hafzullah Aksoy (ICSW, Turkey) Rahim Barzegar (ICGW, Canada)

Description
Lakes and wetlands, all surface waterscapes in general, are under stress of imbalanced water input and output of their systems. A surplus increases the water level while a deficit will decrease it. Anthropogenic interruption such as the excess water used mainly from the groundwater for irrigation has the greatest negative effect on the surface water courses. Also, water encroachment accelerates the lakes and wetlands to diminish. Of course, the effect of climate change is not negligible either. In this symposium, the issue can be discussed to understand the process itself together with the causes of the lake water level drop and possible actions to take against it. The topic has a very broad range of activities which will allow many disciplines to come together.



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H05 Climate Change and The Water Quality

Convener(s): Elango Lakshmanan (ICWQ, India) Chen Xiaohong (ICWQ, China)

Co-Convener(s): Alena Bartosova (ICWQ, Sweden) Stefan Krause (ICWQ, UK) Hong-yi Li (ICWQ, USA) Bertil Nlend (ICWQ, Cameroon)

Description
The degradation of water quality in recent times is a great threat to the ecosystem. Climate change among the other impacts is also affecting the water quality. Adverse impacts of climate change on water quality are of emerging interest and importance. On the other hand, the assessment of water quality also helps to understand the role of weathering in a river basin on climate change and the carbon cycle. The carbon dynamics of catchments and river basins play a vital role in the process of climate change. The movement of water controls the carbon cycle, and its role is not well understood unlike the role of oceans and land. The role of rivers is significant in the tropical regions of the world. The CO2 outgassing from surface waters to the atmosphere and its temporal and spatial variation is controlling climate change. This session will deal with these aspects with the current studies on the water quality, surface water-groundwater interaction, carbon cycle, riverine flux, organic/inorganic carbon, models etc in the context of climate change.



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H06 The Future of Water Resources Management

Convener(s): Gökçen Uysal (ICWRS, Turkey)

Co-Convener(s): Barry Croke (ICWRS, Australia) Slobodan P. Simonovic (N/A, Canada) Jean-Marie Kileshye Onema (ICWRS, Zimbabwe) Chris Leong (ICWRS, Fiji),Moctar Dembélé (ICSW, Burkina Faso)

Description
Nowadays, society needs more comprehensive and adaptive solutions that can help to meet the global challenges posed by the increasing complexity of water resource systems and increasing uncertainties for a secure, sustainable and more fair water future. These challenges are mainly grouped as: population growth; climatic change; land use change; population distribution and migrations; and interactions between people and the environment. At this point, the “systems approach” provides the most appropriate methodology for current and future challenges in water resources management. This symposium focuses on evaluating the lessons learned from the past cases as well as the future perspective of water resources management which is apprised under better adaptation to challenges, linking past and future with concrete ideas and action plans and providing a future outlook with some possible solutions. The symposium also aims to present multi-disciplinary approaches to tackle these challenges from various fields associated with the future of water resources. Especially contributions are invited with topics related to the “Unsolved Problems in Hydrology” Initiative. Particular questions of interest are here UPH 22: “What are the synergies and tradeoffs between societal goals related to water management (e.g. water-environment-energy-food-health)?” and UPH 23: “What is the role of water in migration, urbanisation and the dynamics of human civilisations, and what are the implications for contemporary water management?”



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H07 Stable Isotopes of Water in the Hydrological Cycle

Convener(s): Przemysław Wachniew (ICT, Poland)

Co-Convener(s): Christine Stumpp (ICT, Germany) Zhonghe Pang (ICT, China) Ravindra Dwidedi (ICT, India)

Description
Stable isotopic composition of water (d2H, d18O, d17O) is a powerful but underused tool for tracing water partitioning and fluxes across a wide range of environmental scales: from single organisms to ecosystems, from hillslopes to river catchments, from soil profiles to the critical zone, from aquifer to basin scales, from regional to global atmospheric circulation patterns. Stable isotope technique uses spatial and temporal patterns of isotopic signatures of water for a comprehensive understanding of the cycling of matter through the hydrosphere. As such, this inherently interdisciplinary tracer approach is applicable to all compartments of the hydrological cycle. At the same time, proliferation of novel laser spectrometry technique makes determination of the stable isotope compositions more accessible to wide circles of water researchers and practitioners.



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H08 A Familiar Paradigm – Climate Change and the Soil-Sediment Continuum - Resilience, Thresholds, and Adjustments

Convener(s): Adrian Collins (ICCE, UK) Allen Gellis (ICCE, USA)

Co-Convener(s): Paolo Porto (ICCE, Italy) Sergey Chalov (ICCE, Russia) Anatoly Tsyplenkov (ICCE, Russia) Yuri Jacques da Silva (ICCE, Brazil)

Description
Soil is a non-renewable resource and its protection against water erosion is necessary for a sustainable future. Soil particles are mobilised by a range of on-site processes that include soil erosion or river bank erosion and are ultimately delivered to, and through, river systems, via a number of landscape compartments such as hillslopes, river floodplains and estuaries, before entering the ocean. The mobilisation, transfer and storage of sediment within the landscape gives rise to many environmental problems, both on-site and off-site, and their management and control are increasingly seen as an important component of catchment and environmental management. Recent decades have seen important changes in erosion rates and sediment delivery responses to intensification of land use and land use practices. These changes are also driven by climate change via the occurrence of weather extremes that manifest much elevated erosion rates. As a result, significant changes in the spatial incidence of soil erosion and sediment mobilisation and transfer within river catchments have occurred and such responses are projected to continue under both near- and far-future climates. The sustainability of soil resources, river water quality and the hydro-ecological functioning of river catchments is therefore under threat. Contributions investigating the soil-sediment continuum in the context of weather extremes and climate change, including through the consideration of early warning signals, tipping points, resistance or resilience are warmly welcomed.



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H09 Analysis and Prediction of Hydrological Induced Disasters in High Mountain Environment

Convener(s): Ankit Agarwal (India)

Co-Convener(s): Axel Bronstert (Germany) Wolfgang Schwanghart (Germany) Walter Immerzeel (Netherlands) Manoj K. Jain (India)

Description
Hydrological induced extremes such as droughts, floods and heavy-rain-triggered mass movements account for 45% of the fatalities and 74% of the economic losses caused by natural hazards. Mountainous areas owing to unique hydro-climatological, geological and topographical conditions, and partly seismic activity are particularly susceptible to hydrological induces disasters. Furthermore, climate change is affecting hydrological processes particularly in high mountain regions. Rising temperatures and changes in weather patterns likely elevate risks from hydrological hazards such as frequent or intensified periods of water scarcity and heat waves, riverine and flash floods and associated mass movements, or the occurrence of glacial lake outburst floods. Often these hydrological extremes transform into cascading hazards where an initial event causes a downstream chain reaction. Such extreme events induced hazards interfere with increasing population pressure and expansion of settlements along rivers and new infrastructure developments such as roads and hydropower projects. The complexity of hydrological hazards and their underlying processes in mountainous landscape demand scientific efforts and approaches from multiple disciplines. The proposed session aims to compile recent research that analyses and predicts hydrological induced hazards and risks in the high mountainous region. We encourage research submissions from hydrological, hydrodynamic and hydro-sedimentological analysis and modelling, trends and patterns of extremes, analyzing past, present and future hazards and risks through innovative data-analysis, remote sensing, and risk assessment approaches. With the proposed session, we further target to elucidate options for improved risk management and mitigation in the future.



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H10 Transdisciplinary Citizen-Centred Participatory WEFE Nexus Approaches to Achieve Water, Food, Energy and Environment Security

Convener(s): Fernando Nardi (CandHy, Italy)

Co-Convener(s): Maria Cristina Rulli (Italy) Davide Danilo Chiarelli (Italy) Mohammad Merheb (Lebanon)

Description
Society is tackling unprecedented challenges to face increasing urban and industrial pressures and changing population dynamics while meeting the need of achieving water, food, energy and environmental (WEFE) security and protection. Fair and sustainable allocation of natural resources requires multiple economic and social sectors and interest to co-understand and co-identify optimal shared solutions. The wide heterogeneity of policy makers, practitioners, academic disciplines and users involved in the resource use and supply chains and the variety of spatial and temporal scales to be considered when co-demonstrating and projecting actions and scenarios at short, mid and long terms characterize a complex multi-actor multi-sector framework. Transdisciplinarity is, thus, required considering the importance of supporting geo-earth and hydro-meteo-climate sciences with socio-cultural and behavioral dynamics that govern human-environment interactions. These challenges are particularly important today while top-down green, energy and digital transition are moving fast and may risk not to fund suitable and favorable ground at regional and local scales. In recent times, WEFE Nexus modelling approaches based on consolidated bio-physical quantitative models have demonstrated to provide accurate understanding and simulations of complex ecosystem-human-resource interactions from global to local scales, and from long to short time. Those models have also clearly highlighted the pivotal role of the “human variable”. Nonetheless, WEFE Nexus transdisciplinary methods are lacking behind. Social sciences have analogously progressed in recent years in providing qualitative and quantitative methods and strategies, supporting a knowledge, behavioral and action base, to understand and project societal feedbacks to policy actions in relation to climate and environmental protection actions. This session invites contributions from diverse earth, water and environmental scientists with specific focus on collecting outcomes from research and project works including transdisciplinary participatory approaches and collaboration with social scientists and humanities.



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H11 Stochastic Hydrology With Contributions on Methodologies and Applications, for Modeling, Forecasting, Change Assessment, and Uncertainty Quantification

Convener(s): Ashish Sharma (ICHS, Australia)

Co-Convener(s): Elena Volpi (ICSH, Italy) Simon Papalexiou (Canada) Antonio Zarlenga (ICGW, Italy) Alberto Viglione (ICWRS, Italy)

Description
Stochastic hydrology offers efficient tools for characterizing processes in hydroclimatic systems, e.g., for hydrologic design, hydroclimatic systems modeling and forecasting, and water resources management. Theory and application of stochastic processes enables a faithful and consistent representation of natural processes that in many cases outperforms outcomes of physically based models. Stochastic modelling offers the means to mimic the variability of processes in space and time, and to characterize the inherent uncertainty in probabilistic terms. For example, this allows to simulate synthetic space-time fields reproducing the characteristics of the process – the main statistical properties across multiple spatial and temporal scales – for assessing the hydrological impact in a complex and changing environment. This session call for papers developing and discussing stochastics tools to systematically deal with uncertainty, constant or sudden change, and space-time variability, for characterization or simulation (including disaggregation) purposes of hydroclimatic variables such as precipitation, temperature, streamflow, or soil properties. Contributions are invited, for instance, on the improvement of stochastic modeling in hydrology, innovative techniques for identifying model structure, calibrating parameters, assessing uncertainties also based on a Bayesian approach, etc. (see also the unsolved problems 1-4 and 5-8 identified by Blöschl et al., 2019, which are related to time-variability and change and space-variability and scaling, respectively).



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H12 Extremes in Hydroclimatic Systems

Convener(s): Krzysztof Kochanek (ICSH, Poland)

Co-Convener(s): Ilaria Prosdocimi (ICSH, Italy) Salvatore Grimaldi (IAHS VP, Italy) Marco Marani (Italy)

Description
The occurrence of extreme hydroclimatic events has a tremendous impact on society and environment. Hence, there is an urgency in extreme events understanding and modeling, since those events are not fully captured by space and time variability (see also the unsolved problems 9-11 identified by Blöschl et al., 2019). More specifically, it is of fundamental importance to understand which mechanisms rule the occurrence of extreme events, how they emerge from the parent processes and how their occurrence changes in time or space due to external, environmental factors. This session calls for contribution on advances in statistical theory and applications dealing with extremes in hydroclimatic systems, including multivariate statistical tools, Bayesian techniques, global data and their analysis, etc.



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H13 Vegetation and Hydrology Interactions: A Remote Sensing Perspective

Convener(s): María J. Polo (ICRS, Spain)

Co-Convener(s): Gilles Boulet (ICRS, France) Christopher Hopkinson (ICRS, Canada) Amir Aghakouchak (ICRS, USA) Yangbo Chen (ICRS, China)

Description
The dynamic role of vegetation in the water cycle adds complexity for modelling hydrological processes in a warmer and prone-to-extreme climate. Not only direct interactions due to water absorption from roots and transpiration to the atmosphere, but also indirect impacts of changes in the vegetation cover, like post-fire conditions or modified surface roughness after severe drought periods, can exert a significant control on water and energy fluxes, and eventually become drivers of tipping points on the local and global scales. Remote sensing has already achieved relevant progress in observing vegetation conditions and their changes that help to understand and model such interactions. This symposium focuses on the remote sensing capabilities for the dynamic modelling of these two-way water-vegetation feedbacks and aims to bring discussion on RS-supported observation/simulation of critical conditions and both seasonal and long-term processes, and their relationship. As examples, the interactions of vegetation dynamics with snow accumulation/ablation, infiltration/runoff partition and the critical zone, flood extents and recovery potential, evapotranspiration and water-stress controls, groundwater depletion and recharge, among others. Works are welcome to highlight man-induced and/or global warming critical changes, combination of different remote sensing sources, generation of long term time series of vegetation-water processes descriptors/models parameters, combined data assimilation for dynamic modelling of such feedbacks, or early detection of potential tipping points in the water balance and their impacts on different time/spatial scales.



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H14 Improving Understanding of Hydrological Processes Through Water Quality

Convener(s): Alena Bartosova (ICWQ, Sweden)

Co-Convener(s): Stefan Krause (ICWQ, UK) David Hannah (ICSW, UK) Felipe de Barros (ICWQ, Brazil) Roseanna M. Neupauer (ICGW, USA)

Description
Hydrological processes have been studied with various methods, such as direct and indirect measurements, physical modeling, or computer modeling. Knowledge and understanding of hydrological processes can be strengthened by knowledge and understanding of physical and biogeochemical properties of water moving along the individual pathways. Many computational models are now able to simulate various processes such as infiltration, evapotranspiration, soil moisture, groundwater movement, surface runoff, and movement through various soil layers or drainage. This complexity is not yet met by observed data used in the model validation and evaluation, aside from rising use of Earth Observations (EO) data. Data on various constituents carried by water as it moves through different pathways in the hydrosphere have an untapped potential to differentiate the individual pathways, as the constituents may undergo different processes in different environments or media. Water biogeochemistry signatures can reveal patterns about (reactive) flow paths, mixing of sources and residence times as well as define distribution of flows affected by water transfers or divisions. We invite contributions from all aspects of hydrology that investigate synergies between water quality and water quantity, particularly those focusing on understanding of various hydrological processes and pathways. Special emphasis is given to modeling studies and reducing the model equifinality with water quality data.



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H15 The History of Hydrology

Convener(s): Keith Beven (UK)

Co-Convener(s):

Description
In the Centenary year of IAHS in 2022 a new international initiative on the History of Hydrology was started. Through the enthusiasm of some individuals, there have been past efforts to record some of the history of the science and its institutions but these have been somewhat fragmented and often limited in scope. A proposal for a formal IASH Working Group is currently being considered but more than 20 hydrologists from 16 different countries have expressed interest in being actively involved in such a group. This symposium would be aimed at encouraging contributions from countries that are not currently well represented in reviews of the history; encouraging the recording of the contributions of more female hydrologists; and encouraging more recording of the histories of important experimental catchments and hydrological models.



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JOINT



JA01 Machine Learning in Geo-, Ocean and Space Sciences (IAGA, IAVCEI, IAHS, IASPEI, IAMAS, IAPSO)

Convener(s): Peter Wintoft (Sweden, IAGA)

Co-Convener(s): Hristos Tyralis (Greece, IAHS), Dave Reusch (USA, IAMAS), Istvan Szunyogh (USA, IAMAS), Fatma Jebri (UK, IAPSO), Gesa Maria Petersen (USA, IASPEI), Silvia Massaro (Italy, IAVCEI)

Description
Modern artificial intelligence (AI), machine learning (ML) and deep learning (DL) techniques are in the process of transforming many different fields of geosciences including for example seismology, the modelling of hydrological systems, space weather studies and oceanography. The progress in the development of ML algorithms combined with the increasing availability of geophysical data and computational power deliver a great promise for transformational advancements with the novel computational techniques. In this joined session, we invite presentations on a broad variety of AI, ML and DL methods, that both, establish new or improve commonly performed data processing, detection, clustering, interpretation, prediction and imaging tasks. In particular, we welcome contributions on the integration of ML techniques to improve the quality of oceanographic, geosciences and space sciences research approaches. The goal of the session is to establish the state of AI, ML and DL across multiple geoscientific fields, and to pave the path forward in taking full advantage of the exciting developments in ML/DL.



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JA02 Data Assimilation and Statistical Learning in Earth and Space Sciences (IAGA, IACS, IAHS, IAMAS, IASPEI)

Convener(s): Tomoko Matsuo (USA)

Co-Convener(s): Patricia de Rosnay (UK, IACS), Julien Aubert (France, IAGA), Larry Kepko (USA,IAGA), Salvatore Grimaldi (Italy, IAHS), Craig Bishop (Australia, IAMAS)

Description
This symposium will serve as a forum on the latest research and development in data assimilation and statistical learning across Earth and Space Science community. Data assimilation is a powerful statistical learning framework that combines models, observations, and their respective uncertainties, allowing us to unify data-driven scientific induction with first principle-based deductions. The framework in the general form can be applied to any geophysical system, providing the common ground for our forum. On the other hand, applications of data assimilation and statistical learning techniques to sparsely observed geophysical systems (such as the core, mantle, cryosphere, hydrosphere, thermosphere and ionosphere, and magnetosphere) face considerable challenges, requiring innovative adaptation of methods to maximize the use of sparse observations, and considerable research efforts to quantify model and observational uncertainties. This symposium solicits papers that address unique application challenges faced by different disciplines so that we can learn from each other and further our common interest in advancing data assimilation and statistical learning applications in the Earth and Space Sciences.



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JA03 Analogue Data for the Future: Preservation and Present-Day Utilization of Historical Data in the Geosciences (IAGA, IACS, IASPEI, IAHS, IAG, IAPSO)

Convener(s): Ciarán Beggan (UK, IAGA)

Co-Convener(s): Lauren Vargo (New Zealand, IACS), Kirsten Elger (Germany, IAG), Hisashi Hayakawa (Japan/UK, IAGA), Alberto Viglione (Italy, IAHS), Satheesh S.C. Shenoi (India, IAPSO), Josep Batlló Ortiz (Spain, IASPEI), Kristine Harper (Denmark, IAMAS), Roberto Carniel (Italy, IAVCEI)

Description
In many areas of geophysical and geological studies, long running measurements at a fixed location or over a wider region exist in analogue (physical) form including, amongst others, on photographic paper, in journals or as published tables. It is highly advantageous to convert analogue records to digital values, allowing modern computational techniques and analysis to be applied. However, it is often challenging to convert analogue records as formatting, the type of information recorded, accompanying metadata, and unit metrics change over time. Campaigns to digitize temperature or climate-related measurements have been very successful, especially with the recruitment of keen citizen scientists. However, more scientific formats, such as graphs with technical information or notation, are less amenable to generalist help. Historic analogue records frequently offer significant scientific implications, forming a baseline for analyses of long-term variability and/or short-term extreme hazards in multiple scientific aspects. In this context, it is important to compare these analogue records with one another and document their individual instrumental details for cross-calibrations. This session looks at methods for preservation, extraction, and analysis of historic analogue records, including by manual, image processing or machine learning techniques. This session also accommodates documentation of instrument detail and calibration methods for historical observations. This session welcomes new analyses using data that have previously been in analogue form, and case studies of long-term geophysical variability or individual short-term extreme events. We seek submissions from across all associations.



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JC01 Remote Sensing of the Cryosphere (IACS, IAHS)

Convener(s): Liss Andreassen (Norway, IACS)

Co-Convener(s): Stephan Paul (Germany, IACS), Melody Sandells (UK, IAHS), McKenzie Skiles (USA, IAHS)

Description
The number of aerial and satellite remote sensing platforms and sensors have grown significantly. New sensors open possibilities of using dense time series for exploring the cryosphere and to combine multiple data sources and processing large datasets. In this symposium we welcome presentations of remote sensing of all parts of the cryosphere including seasonal snow, sea ice, glaciers, permafrost, ice sheets and extra-terrestrial glaciology. Contributions that integrate remote sensing and field-based observations to investigate spatial and temporal changes in cold regions are encouraged as well as novel use of remote sensing data to understand processes or support modelling of the cryosphere.



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JC02 Declining Glacier, Snow Cover and Permafrost and Their Impacts on Downstream Hydrology (IACS, IAHS, IAG)

Convener(s): Regine Hock (Norway, IACS)

Co-Convener(s): Wei Feng (China, IAG), James McPhee (Chile/USA, IAHS), Anna-Marie Jörss (IAHS, Germany)

Description
With ongoing climate change, significant changes in the hydrological regime and biogeochemical properties of streams are expected in catchments where glaciers, permafrost or snow cover exist. This symposium focuses on new insights into relevant processes, new observational evidence of ongoing changes, as well as advances in our ability to model future runoff in ice and snow-covered basins on all scales from the local to the global scale. Topics include but are not limited to (a) the impacts of glacier, permafrost and snow cover changes on runoff amounts and seasonality, physical and biogeochemical properties of stream water, and hydrological pathways, (b) trends in river runoff in glacier-, permafrost- and snow-affected catchments and their causes, and (c) snow-permafrost-glacier-climate-runoff feedbacks and related physical processes, including the effects of black carbon/aerosols and changing atmospheric drivers on melt runoff and geophysical risks.



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JC03 Coupling Processes Between the Atmospheric Boundary-Layer and Snow - Ice Surfaces: Modelling at Convection and Snowdrift-Permitting Scales (IACS, IAHS, IAMAS)

Convener(s): Richard Essery (UK,IACS)

Co-Convener(s): Vincent Vionnet (Canada, IACS), Tobias Jonas (Switzerland, IAHS), Rebecca Mott (Switzerland, IAMAS)

Description
This symposium addresses fundamental exchange mechanisms of mass and energy between the cryosphere and the atmospheric boundary layer in snow and ice covered regions. The interaction between the near-surface atmosphere and the cryosphere can lead to significant spatial and temporal variations of momentum, mass and energy exchanges as well as complex atmospheric flow patterns modulated by complexities in topography. These processes strongly affect the evolution of seasonal snow cover, permafrost and glaciers, and drive snow and ice hydrology. Moves towards convection-permitting scales in numerical weather prediction have also brought benefits for resolving atmospheric flows and precipitation in mountainous topography, but coupled modelling at smaller “snowdrift-permitting” scales for which there can be significant redistribution of snow between model grid cells has not yet been so widely investigated. We invite contributions on, but not limited to, the following topics: modelling of turbulent fluxes to snow and ice surfaces in stable boundary layers; advection of energy to snow cover and glaciers, and impacts on snow and ice melt; orographically-induced precipitation and preferential deposition of snowfall; wind-induced snow transport and associated sublimation. Studies in level and mountainous terrains are welcome. We particularly encourage abstracts that propose advances in modelling techniques to represent the physics of coupling the atmospheric boundary layer to snow and ice surfaces, and in applications of high-resolution snow and ice mass balance modelling.



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JG04 Satellite Gravimetry for Groundwater Monitoring (IAG, IAHS)

Convener(s): Adrian Jäggi (Switzerland, IAG)

Co-Convener(s): Andreas Güntner (Germany, IAG), Felipe de Barros (Brazil/USA, IAHS), Michelle Newcomer (USA, IAHS)

Description
Groundwater is one of the most important freshwater resources for mankind and for ecosystems. Assessing groundwater resources and developing sustainable groundwater management plans are major fields of activity for science, water authorities and consultancies worldwide. To this end, sound data on the status of groundwater level and storage and of their changes is required. GRACE and GRACE-FO satellite gravimetry provides a unique capability to monitor subsurface mass transport and thus large-scale groundwater storage variations. In this symposium we gather the latest developments in the field of groundwater monitoring by satellite gravimetry. Contributions are solicited that that address improved GRACE/GRACE-FO processing strategies towards groundwater applications, methods for separating out groundwater storage variations from the total water storage observed by GRACE/GRACE-FO, evaluations of gravity-based groundwater storage against independent data sets, case studies of gravity-based groundwater resources assessments with or without combination with complementary data sets and models, developments of gravity-based groundwater products and services, among others.



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JG05 Geodesy for Climate Research (IAG, IAMAS, IACS, IAPSO, IAHS)

Convener(s): Annette Eicker (Germany, IAG)

Co-Convener(s): Bert Wouters (Netherlands, IACS), John T Reager (USA, IAHS), Adam Scaife (UK, IAMAS), Benoit Meyssignac (France, IAPSO)

Description
This symposium is dedicated to the use of geodetic measuring techniques for innovative climate and Earth system studies. Modern geodetic observing systems document a wide range of changes in the Earth’s solid and fluid layers at very different spatial and temporal scales related to processes as, e.g., the terrestrial and atmospheric water cycle, ocean and atmosphere dynamics, sea level, ice-mass balance, and glacial isostatic adjustment. Different time spans of observations need to be cross-compared and combined to resolve a wide spectrum of climate-related signals. Geodetic observables are also often compared with geophysical models and climate models, which helps to explain observations, test theories, evaluate simulations, and finally merge measurements and numerical models via data assimilation. We appreciate contributions utilizing data from diverse geodetic observation techniques including altimetry and gravimetry satellites, navigation satellite systems, satellite radio occultation and reflectometry, InSAR, VLBI, tide gauges, or remote sensing. We welcome studies that cover a wide variety of applications of geodetic measurements and their combination to observe and model Earth system signals in hydrological, ocean, atmospheric, climate and cryospheric sciences. Any new approaches helping to separate and interpret the variety of geophysical signals are equally appreciated. Contributions working towards any of the goals of the Inter-Commission Committee on "Geodesy for Climate Research" (ICCC) of the International Association of Geodesy (IAG) are very welcome in this symposium.



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JH01 New, Large, and Open Data for the Earth and Environmental Science Community (IAHS, IAPSO, IACS, IAGA, IASPEI)

Convener(s): Heidi Kreibich (Germany, IAHS)

Co-Convener(s): Charles Fierz (Switzerland, IACS), Masahito Nosé (Japan, IAGA), Elena Tel Pérez (Spain, IAPSO), Florian Haslinger (Switzerland, IASPEI)

Description
Data is essential for understanding, modeling and managing earth and environmental processes, their interactions and their dynamics. Therefore, the acquisition, management and use of data is a central component of all earth and environmental sciences. New data sources and advanced monitoring methods, including new sensors and instruments on the ground, at sea and in the air, web crawling technology and citizen science, as well as the strong trend towards open data and data sharing, open up fantastic opportunities but also bring challenges. There are concerns, for example, about ensuring and appropriately documenting data quality in particular with respect to ‘new data’, as well as about creating sufficient incentives for monitoring, data sharing and monitoring downstream usage (attribution) with persistent identifiers, or about adequate long-term curation of raw data and derived products. The aim of this symposium is to present and discuss new opportunities, but also challenges of these developments. We want to learn from each other how to support and implement the UNESCO recommendation for open science, the WMO Unified Data Policy, and the IOC/IODE recommendations in the framework of the UN Ocean Decade. For example, issuing and managing persistent identifiers throughout the data lifecycle, building FAIR and CAREful 'open' services, enforcing proper citation, are approaches that help achieving the vision of FAIR (Findable, Accessible, Interoperable and Reusable) and CARE (Collective benefit, Authority to control, Responsibility and Ethics) data that support quality action and research in the open science environment.



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JH02 Advances in Snow Hydrology (IAHS, IACS)

Convener(s): Timothy Link (USA, IAHS)

Co-Convener(s): Richard Essery (UK,IACS), Anna-Marie Jörss (IAHS, Germany)

Description
The storage and release of water from seasonal snowcovers constitutes a critical component of the annual hydrological cycle in many parts of the world. Quantifying, understanding, and predicting the processes that control snow distribution and ablation dynamics provide ample research challenges, especially in complex mountainous terrain. The spatial distribution of snowcover and its physical properties is highly variable at site to regional scales. Its dynamics are influenced by surrounding topography and vegetation that control accumulation and redistribution processes, as well as local micrometerological conditions that control snowcover energetics and ablation. Accurate measurement and modelling of snowcovers requires methods to assess variations in patterns and processes that act and interact at a range of spatial and temporal scales. Advances in these areas are needed and relevant to develop improved tools for scientists and managers concerned with floods, droughts, water supply, terrestrial and aquatic ecology, and the water-energy nexus in a changing climate. This session will bring together experimental and modeling experts to address recent research in snow hydrology. We especially encourage contributions related to topics such as: - Novel measurement approaches for snowpack states and fluxes - Feedbacks between climatic and snow hydrological processes and patterns - Snow-vegetation interactions in complex terrain - Effects of climate variability and change, especially in the rain-snow transition zone - Interactive effects of changing snow regimes and land cover patterns - Dynamics of the water-energy nexus in snow-dominated watersheds - Representation of small-scale variability in large scale modeling applications - Advances in modeling, including operational applications.



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JH03 Snow in the Critical Zone (IAHS, IACS)

Convener(s): McKenzie Skiles (USA, IAHS)

Co-Convener(s): Marie Dumont (France, IACS), Maria Jose Polo (Spain, IAHS), Richard Petrone (Canada, IAHS)

Description
In high elevation and high latitude environments snow plays an important role in the critical zone, the layer of Earth where fresh water flows and life exists. In regions where snow accumulates seasonally the temporal patterns of snow storage are intricately linked with phenology, and snowmelt is often the dominant source of streamflow generation and groundwater recharge that sustains ecological systems. Ecosystems that store snow, and those downstream that rely on the consistent timing and magnitude of snowmelt, are vulnerable to less and more variable snow cover in response to a warming climate. These systems are also at risk from rapid change due to disturbance events, such as forest fires or insect infestation, which are increasing in frequency and have long term implications for ecosystem function. This symposium welcomes all submissions that observe or simulate snow-ecosystem interactions and aim to better characterize the role of snow and meltwater hydrology in the critical zone. For example, studies of snow melt partitioning and storage, snow-vegetation interaction, and how snow and snow dominated systems are being impacted by, and responding to, change and disturbance.



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JH04 Anthropocene: Perspectives From and Within Geophysics (IAHS, IAMAS, IACS, IASPEI, IAVCEI, IAG, IAPSO)

Convener(s): Christophe Cudennec (France, IAHS)

Co-Convener(s): Richard Essery (UK,IACS), Melita Keywood (Australia, IAMAS/iCACGP), Mark Lawrence (Germany, IAMAS/iCACGP), Domenico Giardini (Switzerland, IASPEI), Roberto Sulpizio (Italy, IAVCEI), Catia Domingues (UK, IAPSO)

Description

As the International Union of Geological Sciences considers the Anthropocene from a stratigraphic perspective, and as other communities are considering a wider definition (see the ICSU-ICS intermediate synthesis in 2016, https://www.sciencedirect.com/journal/global-environmental-change/vol/39/suppl/C) IUGG has to reconsider the concept and to renew its contribution. This session welcomes any communication in that perspective, including about great acceleration, planetary boundaries, change detection and attribution, climate change and other changes to the atmosphere-ocean-cryosphere-hydrosphere system, such as erosion-sedimentation, man-induced seismicity and man-driven geomorphology, along with related farther-reaching topics such as One Health; and assessing these issues and science-informed policy options for mitigation and adaptation together with the socio-geosciences.





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JH05 Citizen Science, Crowdsourcing and Innovative Monitoring for Advancing Geo-Sciences (IAHS, IASPEI, IAGA, IACS, IAMAS)

Convener(s): Fernando Nardi (Italy, IAHS)

Co-Convener(s): Ryan Crumley (USA, IACS), Manoj Nair (USA, IAGA), Thomas Spengler (Norway, IAMAS), Rémy Bossu (France, IASPEI)

Description
Citizen involvement in science has been transformed in the last decade by new and widely accessible data acquisition and processing tools as well as by pervasive low-cost and portable technology. Geospatial technologies and affordable equipment (smart phones, cameras, drones, etc.) allow students, researchers, and citizens to gather, analyze, visualize, and share a wealth of earth system data at different spatial and temporal scales. New opportunities are, thus, arising for addressing the uncertainties and inaccuracies of geophysical models and risk management within different fields, for a better understanding, monitoring, and forecasting of geophysical extremes. Citizen science is supporting a new paradigm for geosciences, where active citizens and crowdsourcing of data have a pivotal role for risk mitigation, communication, and awareness. This transition requires multi-disciplinary and trans-sectoral knowledge, analytical approaches, and data processing methods, spanning from earth-, geo-, hydro-, cryo- sciences to humanities as well as social and communication sciences, to synergistically define the guidelines and procedures that support effective use of human-sensed data. A key challenge in using citizen-science data is the significant noise content in the data collected by untrained users. Recent advances in Machine-Learning (ML) could allow us to build noise-filtering algorithms that can take advantage of high volumes of data created by citizen-science projects.  In this framework, the use of unintended technology along with do-it-yourself and low cost equipment is opening novel observational avenues. This joint symposium seeks contributions on data, tools, methods, and procedures that explore the role, value, and performances of citizen science and innovative sensing for earth science research.



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JH06 Education & Outreach in Geosciences (IAHS, IASPEI, IAGA, IAG, IAVCEI, IACS, IAMAS, IAPSO)

Convener(s): Christophe Cudennec (France, IAHS)

Co-Convener(s): Fabien Maussion (Austria, IACS), Markku Poutanen (Finland, IAG), Katia Pinheiro (Brasil, IAGA), Tereza Kameníková (Czech Republic, IAGA), Thomas Spengler (Norway, IAMAS), Angela Pomaro (Italy, IAPSO), Raju Sarkar (Bhutan, IASPEI), Natalia Pardo (Colombia, IAVCEI)

Description
Sharing scientific knowledge and methods through education and outreach is of high importance to support the societal transition in terms of sustainability, development, and security. Initial and life-long education, training in operational services, and capacity development within institutions and society are facing many challenges, when dealing with environmental and societal changes, disaster risk reduction, and the evolution of techniques along the data – information – knowledge – decision support chain. This symposium welcomes conceptual developments as well as practical study cases from geoscientists, as well as from didacticians and knowledge brokers. The variety of approaches across disciplines and across the diversity of the geosciences will provide a collective overview on education and outreach activities the basics and variants in our fields. The symposium also encourages sharing of lessons learned from the enhanced digitization induced by the pandemic and from the ongoing digital revolution, showcasing perspectives of the knowledge society and the Open Science paradigm.



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JM01 Recent Advances in Regional Climate Modelling (IAMAS, IACS, IAHS)

Convener(s): Tomas Halenka (Czech Republic, IAMAS)

Co-Convener(s): Sven Kotlarski (Switzerland, IACS), Erika Coppola (Italy, IAHS)

Description
Regional climate models (RCMs) are important tools which can be used not only for dynamical downscaling of global climate models (GCMs) but for the analysis of a broad spectrum of problems, e.g. in land surface interaction, cloud processes, atmospheric chemistry and many other purposes. These also include hydrological and cryospheric applications, acknowledging the fact that due to their interactive role in the climate system sophisticated representations of the terrestrial hydrology and the terrestrial cryosphere are incorporated in today's state-of-the-art climate models. A recent trend in RCM development concerns the increase of the spatial resolution, shifting from a few tens towards just a few kilometers. This so-called convection-permitting mode enables the explicit representation of small scale features such as convective precipitation extremes or specific climate features in complex topography. However, this approach is very demanding in terms of computational resources, which requires specific developments in IT and high-performance computing. These challenges already lead to broader cooperations between modelling groups (e.g., CORDEX). These collaborations, in turn, are able to provide larger ensembles for certain regions of interest with a decent coverage of projection uncertainty. In general, high-resolution simulations from RCMs can significantly improve the applicability for climate change impacts assessment - including impacts on the terrestrial hydrology and cryosphere - and for further climate services and the development of adaptation strategies. Contributions addressing all these above mentioned aspects as well as broader regional climate modelling science are welcome to be submitted for this session.



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JM04 Weather and Climate Extremes: Understanding, Modeling, Prediction, and Impacts (IAMAS, IAHS)

Convener(s): Julie Mireille Thériault (Canada, IAMAS), Jiwen Fan (USA, IAMAS)

Co-Convener(s): Corinna Hoose (Germany, IAMAS), Hongyi Li (USA, IAHS), Abhishekh K Srivastava (USA, IAMAS), Christopher White (UK, IAHS), Brian Golding (UK, IAMAS)

Description
Weather and climate extremes have been increasing in both frequency and magnitude, imposing significant impacts on society. These include, but are not limited to, heavy rain and rain-on-snow events leading to major flooding events, occurrence of hail damaging crops and infrastructure, heavy wet snow and freezing precipitation causing major power outages and transportation interruptions, excessive heat causing major loss of life. Physical factors affecting extreme event intensity and frequency are particularly complicated by human-natural system interactions. A better understanding of extreme events, especially compound events, and their impacts requires interdisciplinary research, and this session aims to foster cross-discipline discussion and collaboration on this topic. We solicit studies that utilize various tools such as observations, analysis, and modelling, integration with machine learning and artificial intelligence at various scales from the fields of atmospheric and climate sciences, land- and marine-atmosphere interactions, and hydrology to improve (a) understanding of contributing factors, (b) prediction of extremes at various time scales, (c) models across scales, and (d) impacts on society. Work on human-natural interactions (such as interactions with urbanization, greenhouse gases and aerosols and including vulnerability and risk assessment), sub-seasonal and seasonal prediction, and convection-permitting Earth system modeling are particularly welcome. Contributions relevant to the World Weather Research Programme project on High-impact Weather (HIWeather) and to the World Climate Research Programme Grand Challenge on Climate and Weather Extremes including cross-cutting themes are especially encouraged.



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JM05 Earth System Models: Assessing the Earth System’s State and Fate From Regional to Planetary Scales (IAMAS, IAHS, IACS, IAPSO, IAVCEI?)

Convener(s): François Massonnet (Belgium, IAMAS)

Co-Convener(s): Sophie Nowicki (USA, IACS), Richard Petrone (Canada, IAHS), Anna von der Heydt (Netherlands, IAPSO)

Description
Earth System Models (ESMs) have become a cornerstone in geosciences, being used for process understanding, detection and attribution of climate signals, prediction from sub-seasonal to millennial time scales, regional downscaling, and impact analyses. Each generation of ESMs presents refinements compared to the previous one: from one cycle of model development to the next, spatial resolution increases, more components of the Earth system are included, and new processes become explicitly represented. Also, observations and data-driven approaches are increasingly used within ESMs to better predict high-impact events. This symposium encourages contributions dealing with the many facets of Earth System Model development, evaluation, and application, including but not limited to: modeling results from the Coupled Model Intercomparison Project Phase 6, development and assessment of models making use of recent Earth observations from ground- and space-based measurements, prediction of climate on seasonal to centennial timescales, climate change detection and attribution, regional-scale climate modeling and process analysis, high-resolution climate modeling, and subgrid scale parameterization development including statistical and machine learning techniques. Submissions on the latest advances in coupled aspects of the Earth system are particularly encouraged.



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JP01 Tides (IAPSO, IAHS, IAGA, IASPEI, IAG)

Convener(s): Joanne Williams (UK, IAPSO)

Co-Convener(s): Jean-Paul Boy (France, IAG), Nick Pedatella (USA, IAGA), Christophe Cudennec (France, IAHS), Philip Woodworth (UK, IAPSO), Evgeny Podolskiy (Japan, IASPEI)

Description
The session will be open to submissions on any aspect of the tides of the ocean, estuaries, lakes, solid earth, and atmosphere. Tides are fundamental to many geophysical processes, driving ocean mixing, contributing to coastal erosion and sediment transport, and influencing ocean biogeochemistry and ecosystems. Tides affect port operations and coastal infrastructure and modulate the severity of storm surges and coastal flooding. Energy from ocean tides is harnessed for electricity generation. In the cryosphere, tides are also important, including for sea ice dynamics, transport and mixing processes. Icy worlds are not only affected by tides but also modulate them. For example, sea ice dampens tidal amplitudes and currents. At the same time, tides regulate the growth of sea ice, contribute to melting of glacial/sea ice, and can be a pacemaker of glacier flow, deformation, and fracture. Interannual variability in the tides may arise from variations in sea ice extent, changes in ocean stratification or regional climate processes. Tides also play an important role throughout Earth's atmosphere, as well as in other planetary atmospheres. Coastal, regional and global models of tides and internal tides continue to develop, as do techniques for observing tides and reconstructing historical tidal data. We welcome presentations on these methods, and discoveries about past and future long-term changes in tides, tidal variability, tidal dynamics, and the impacts of tides.



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JS09 Early Warning Systems for Geohazards (IASPEI, IAVCEI, IAHS, IAG)

Convener(s): Elisa Zuccolo (Italy, IASPEI)

Co-Convener(s): John LaBrecque (USA, IAG), Maria-Helena Ramos (France, IAHS), Roberto Sulpizio (Italy, IAVCEI)

Description
Natural disasters related to a variety of geohazards (e.g. earthquakes, landslides, volcanic eruptions, tsunamis and floods) constantly pose threats to humankind and ecosystems at large on a global scale. Exposure to geohazards has increased dramatically in recent decades, and climate change has already affected the frequency and severity of weather-related events in several regions of the world. Consequently, social vulnerability has also changed, prompting Civil Protection authorities and decision makers to increasingly focus on disaster mitigation and risk reduction strategies. In this context, Early Warning Systems (EWS) constitute a major tool to improve preparedness and response to geohazards, prevent loss of life, and reduce economic impacts. Increasing the availability and access to multi-hazard EWS and disaster risk information is also one of the global targets set by the Sendai Framework for Disaster Risk Reduction 2015-2030. This Symposium aims at bringing together scientific and operational advances on the development and demonstration of EWS for geohazards. It provides an opportunity for summarizing the progresses in the achievement of the Sendai Framework targets and reporting on latest trends in EWS for a broad range of geohazards. It also includes identifying current gaps and key challenges for the co-design of EWS with stakeholders and end users, and for their practical implementation. The symposium encourages original research and sharing of knowledge, lessons learned and emerging examples of good practice. The goal is to favor a multi-disciplinary discussion and synergies as a basis for commitments aimed at expanding EWS capacities for geohazards. Topics of interest include but are not limited to: (i) monitoring systems for geohazards, (ii) dynamic and evolutionary process modelling; (iii) treatment of epistemic uncertainty; (iv) decision-making strategies; (v) methodologies and tools for (near) real-time risk mitigation; (vi) cost-benefit analysis and evaluation of socio-economic impact; (vii) evaluation of cascading effects; (viii) practical case studies.

Solicited speaker: Simona Colombelli (University of Naples Federico II, Italy)

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