Articles | Volume 23, issue 5
https://doi.org/10.5194/nhess-23-1769-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-23-1769-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 May 2023
Research article |
| 12 May 2023
| 12 May 2023
Statistical modeling of sediment supply in torrent catchments of the northern French Alps
Maxime Morel
Univ. Grenoble Alpes, INRAE, CNRS, IRD, Grenoble INP, IGE, 38000 Grenoble, France
Office National des Forêts – service de Restauration des Terrains en Montagne des Hautes-Alpes, 5 rue des Silos, 05000 Gap, France
Univ. Grenoble Alpes, INRAE, CNRS, IRD, Grenoble INP, IGE, 38000 Grenoble, France
Damien Kuss
Office National des Forêts – Direction Forêt et Risques Naturels, 9 quai Créqui, 38000 Grenoble, France
Syndicat Mixte des Bassins Hydrauliques de l’Isère, 9 rue Jean Bocq, 38022 Grenoble, France
Guillaume Evin
Univ. Grenoble Alpes, INRAE, CNRS, IRD, Grenoble INP, IGE, 38000 Grenoble, France
Caroline Le Bouteiller
Univ. Grenoble Alpes, INRAE, CNRS, IRD, Grenoble INP, IGE, 38000 Grenoble, France
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Eleni Kritidou, Martina Kauzlaric, Maria Staudinger, Guillaume Evin, Marc Vis, and Daniel Viviroli
EGUsphere, https://doi.org/10.5194/egusphere-2026-2338, https://doi.org/10.5194/egusphere-2026-2338, 2026
This preprint is open for discussion and under review for Hydrology and Earth System Sciences (HESS).
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In mountain regions, precipitation varies with elevation, but models often simplify this relationship. We used simulations combining a weather generator and a hydrological model to explore how different precipitation different lapse rates affect runoff and floods in Switzerland. We found that they impact yearly and seasonal river flow and flood behavior. Higher-elevation catchments were less sensitive, and higher lapse rates increased summer floods, while lower rates increased winter floods.
Eric Sauquet, Guillaume Evin, Sonia Siauve, Ryma Aissat, Patrick Arnaud, Maud Bérel, Jérémie Bonneau, Flora Branger, Yvan Caballero, François Colléoni, Agnès Ducharne, Joël Gailhard, Florence Habets, Frédéric Hendrickx, Louis Héraut, Benoît Hingray, Peng Huang, Tristan Jaouen, Alexis Jeantet, Sandra Lanini, Matthieu Le Lay, Claire Magand, Louise Mimeau, Céline Monteil, Simon Munier, Charles Perrin, Olivier Robelin, Fabienne Rousset, Jean-Michel Soubeyroux, Laurent Strohmenger, Guillaume Thirel, Flore Tocquer, Yves Tramblay, Jean-Pierre Vergnes, and Jean-Philippe Vidal
Hydrol. Earth Syst. Sci., 30, 2277–2300, https://doi.org/10.5194/hess-30-2277-2026, https://doi.org/10.5194/hess-30-2277-2026, 2026
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The Explore2 project has provided an unprecedented set of hydrological projections in terms of the number of hydrological models used and the spatial and temporal resolution. The results have been made available through various media. Under the high-emission scenario, the hydrological models mostly agree on the decrease in seasonal flows in the south of France, confirming its hotspot status, and on the decrease in summer flows throughout France, with the exception of the northern part of France.
Caroline Le Bouteiller, Thomas De Almeida, Juliette Pellerano, Arthur Bayle, Philippe Choler, Laurent Borgniet, Hemanti Sharma, and Sebastien Klotz
EGUsphere, https://doi.org/10.5194/egusphere-2026-834, https://doi.org/10.5194/egusphere-2026-834, 2026
This preprint is open for discussion and under review for Earth Surface Dynamics (ESurf).
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Badlands are heavily eroded landscapes where plants play a major role in controlling erosion. Using 40 years of aerial and satellite images of a badland site in the French Alps, we found that vegetation increased from 39 %–46 %, mainly due to young pines spreading onto bare ground. Vegetation colonization and retreat are linked to erosion and slope stability, seed dispersal, and climate. Understanding these relationships is needed to better predict how these landscapes may change in the future.
Abubakar Haruna, Juliette Blanchet, Guillaume Evin, and Emmanuel Paquet
Adv. Stat. Clim. Meteorol. Oceanogr., 12, 87–109, https://doi.org/10.5194/ascmo-12-87-2026, https://doi.org/10.5194/ascmo-12-87-2026, 2026
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This study advances nonstationary precipitation modeling by using single, flexible distributions to analyze trends across the full daily spectrum. We demonstrate that evolving shape parameters are critical for accurately capturing observed differential changes in low, medium, and extreme quantiles. This method ensures statistical consistency, providing reliable trend assessments over the two-component framework common in climate impact analysis.
Simon Filhol, Clément Misset, Noélie Bontemps, Diego Cusicanqui, Emmanuel Paquet, Marie Dumont, Olivier Gagliardini, Pascal Lacroix, Simon Gascoin, Guillaume Thirel, Julien Brondex, Pascal Hagenmuller, Eric Larose, Philipp Schoeneich, Denis Roy, Emmanuel Thibert, Nicolas Eckert, Félix de Montety, Robin Mainieri, Alexandre Hauet, Frédéric Gottardi, Johan Berthet, Alexandre Baratier, Frédéric Liébault, Małgorzata Chmiel, Guillaume Piton, Guillaume Chambon, Guillaume James, Philippe Frey, Philip Deline, Laurent Astrade, Christian Vincent, Dominique Laigle, Alain Recking, Fatima Karbou, Adrien Mauss, Mylène Bonnefoy-Demongeot, Firmin Fontaine, Mickael Langlais, Etienne Berthier, and Antoine Blanc
EGUsphere, https://doi.org/10.5194/egusphere-2026-971, https://doi.org/10.5194/egusphere-2026-971, 2026
This preprint is open for discussion and under review for Natural Hazards and Earth System Sciences (NHESS).
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On June 21 2024, the village of La Bérarde, in the French Alps, was devastated by a flood destroying centuries old buildings. This study is an interdisciplinary work to decipher the causes and chronology of the event. The flood started with decadal rain falling on a thick snowpack. A lake observed on top of a glacier few days prior, had drained post event. With climate change, should we expect more similar compound events for alpine communities?
Guillaume Evin, Benoit Hingray, Guillaume Thirel, Agnès Ducharne, Laurent Strohmenger, Lola Corre, Yves Tramblay, Jean-Philippe Vidal, Jérémie Bonneau, François Colleoni, Joël Gailhard, Florence Habets, Frédéric Hendrickx, Louis Héraut, Peng Huang, Matthieu Le Lay, Claire Magand, Paola Marson, Céline Monteil, Simon Munier, Alix Reverdy, Jean-Michel Soubeyroux, Yoann Robin, Jean-Pierre Vergnes, Mathieu Vrac, and Eric Sauquet
Hydrol. Earth Syst. Sci., 30, 1023–1051, https://doi.org/10.5194/hess-30-1023-2026, https://doi.org/10.5194/hess-30-1023-2026, 2026
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Explore2 provides hydrological projections for 1,735 French catchments. Using QUALYPSO (Quasi-Ergodic Analysis of Climate Projections Using Data Augmentation), this study assesses uncertainties, including internal variability. By the end of the century, low flows are projected to decline in southern France under high emissions, while other indicators remain uncertain. Emission scenarios and regional climate models are key uncertainty sources. Internal variability is often as large as climate-driven changes.
Elisa Kamir, Samuel Morin, Guillaume Evin, Penelope Gehring, Bodo Wichura, and Ali Nadir Arslan
Earth Syst. Sci. Data, 18, 17–32, https://doi.org/10.5194/essd-18-17-2026, https://doi.org/10.5194/essd-18-17-2026, 2026
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This article describes a dataset of annual snow depth maximum across Europe, from 1961 to 2015, based on a regional reanalysis. It evaluates the performance of the dataset, against in-situ snow depth observations. This dataset is found to perform well in most environments, with challenges at high elevation and some coastal areas. Assessing the quality of this dataset is necessary in order to use it as a baseline to infer future changes of extreme snow loads under climate change.
Yves Tramblay, Guillaume Thirel, Laurent Strohmenger, Guillaume Evin, Lola Corre, Louis Heraut, and Eric Sauquet
Hydrol. Earth Syst. Sci., 29, 7023–7039, https://doi.org/10.5194/hess-29-7023-2025, https://doi.org/10.5194/hess-29-7023-2025, 2025
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How does climate change impact floods in France? Using simulations for 3727 rivers with climate projections, results show that flood trends vary depending on the region. In the north, floods may become more severe, but in the south, the trends are mixed. Floods from intense rainfall are becoming more frequent, while snowmelt floods are strongly decreasing. Overall, the study shows that understanding what causes floods is key to predicting how they are likely to change with the climate.
Valentin Dura, Guillaume Evin, Anne-Catherine Favre, and David Penot
EGUsphere, https://doi.org/10.5194/egusphere-2025-5679, https://doi.org/10.5194/egusphere-2025-5679, 2025
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Traditional precipitation analysis often misrepresent seasonal totals and spatial variability of intense rainfall in mountains. This study introduces a reproducible workflow to generate a daily precipitation ensembles, conditioned on rain gauges. It outperforms standard products by better capturing seasonal totals. It also quantifies interpolation uncertainty, improving flood modeling. The open-source workflow is transferable to regions with sparse rain-gauge networks or limited radar coverage.
Yassine Boukhari, Antoine Lucas, Caroline Le Bouteiller, Sébastien Klotz, Gabrielle Chabaud, and Stéphane Jacquemoud
Earth Surf. Dynam., 13, 1205–1228, https://doi.org/10.5194/esurf-13-1205-2025, https://doi.org/10.5194/esurf-13-1205-2025, 2025
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We combine aerial and drone Light Detection and Ranging surveys with sediment export and density measurements to assess catchment-scale mass balance in a badland environment. Landslides and crest failures are found to contribute 15 % of total mass export while affecting only 1 % of bare surfaces. Flood-condition drainage reconstruction shows low-drainage areas export 3.5 times more sediment than other slopes.
Miao Huo, Stéphane Lambert, Firmin Fontaine, and Guillaume Piton
Nat. Hazards Earth Syst. Sci., 25, 4115–4134, https://doi.org/10.5194/nhess-25-4115-2025, https://doi.org/10.5194/nhess-25-4115-2025, 2025
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The presented study mainly describes the loading on a flexible barrier at rest in order that the static component of the force exerted by the dead zone received limited attention up to now. Four interaction modes are identified from a gentle flow stopping to high granular jump and/or overtopping. Interestingly, overflow resulted in a significant increase in the residual load and were almost twice that observed in the absence of overflow.
Suzanne Lapillonne, Georgios Fourtakas, Vincent Richefeu, Guillaume Piton, and Guillaume Chambon
Geosci. Model Dev., 18, 7059–7075, https://doi.org/10.5194/gmd-18-7059-2025, https://doi.org/10.5194/gmd-18-7059-2025, 2025
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Debris flows are fast-flowing events that are saturated with granular material. They naturally occur in steep creeks and are a threat to local communities. Scientists have turned to numerical models to better understand how they behave. We investigate the accuracy of a numerical model that relies on modelling the debris flow as a mixture of a granular phase and a fluid phase. We focus on a demonstration of the capacity of the model to reliably represent the behaviour of the flow at different scales.
Valentin Dura, Guillaume Evin, Anne-Catherine Favre, and David Penot
EGUsphere, https://doi.org/10.5194/egusphere-2025-1779, https://doi.org/10.5194/egusphere-2025-1779, 2025
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Traditional precipitation analyses often misrepresent intense rainfall's spatial variability. This study evaluates different spatial covariances to capture this variability in a geostatistical framework. The best covariance includes anisotropy derived from daily climate model simulations, offering a reliable alternative to anisotropy estimation using rain gauges. These findings highlight the importance of including anisotropy when generating precipitation inputs for hydrological modeling.
Maria Staudinger, Martina Kauzlaric, Alexandre Mas, Guillaume Evin, Benoit Hingray, and Daniel Viviroli
Nat. Hazards Earth Syst. Sci., 25, 247–265, https://doi.org/10.5194/nhess-25-247-2025, https://doi.org/10.5194/nhess-25-247-2025, 2025
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Various combinations of antecedent conditions and precipitation result in floods of varying degrees. Antecedent conditions played a crucial role in generating even large ones. The key predictors and spatial patterns of antecedent conditions leading to flooding at the basin's outlet were distinct. Precipitation and soil moisture from almost all sub-catchments were important for more frequent floods. For rarer events, only the predictors of specific sub-catchments were important.
Valentin Dura, Guillaume Evin, Anne-Catherine Favre, and David Penot
Hydrol. Earth Syst. Sci., 28, 2579–2601, https://doi.org/10.5194/hess-28-2579-2024, https://doi.org/10.5194/hess-28-2579-2024, 2024
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The increase in precipitation as a function of elevation is poorly understood in areas with complex topography. In this article, the reproduction of these orographic gradients is assessed with several precipitation products. The best product is a simulation from a convection-permitting regional climate model. The corresponding seasonal gradients vary significantly in space, with higher values for the first topographical barriers exposed to the dominant air mass circulations.
Tobias Roylands, Robert G. Hilton, Erin L. McClymont, Mark H. Garnett, Guillaume Soulet, Sébastien Klotz, Mathis Degler, Felipe Napoleoni, and Caroline Le Bouteiller
Earth Surf. Dynam., 12, 271–299, https://doi.org/10.5194/esurf-12-271-2024, https://doi.org/10.5194/esurf-12-271-2024, 2024
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Chemical weathering of sedimentary rocks can release carbon dioxide and consume oxygen. We present a new field-based method to measure the exchange of these gases in real time, which allows us to directly compare the amount of reactants and products. By studying two sites with different rock types, we show that the chemical composition is an important factor in driving the weathering reactions. Locally, the carbon dioxide release changes alongside temperature and precipitation.
Guillaume Evin, Matthieu Le Lay, Catherine Fouchier, David Penot, Francois Colleoni, Alexandre Mas, Pierre-André Garambois, and Olivier Laurantin
Hydrol. Earth Syst. Sci., 28, 261–281, https://doi.org/10.5194/hess-28-261-2024, https://doi.org/10.5194/hess-28-261-2024, 2024
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Hydrological modelling of mountainous catchments is challenging for many reasons, the main one being the temporal and spatial representation of precipitation forcings. This study presents an evaluation of the hydrological modelling of 55 small mountainous catchments of the northern French Alps, focusing on the influence of the type of precipitation reanalyses used as inputs. These evaluations emphasize the added value of radar measurements, in particular for the reproduction of flood events.
Isabelle Ousset, Guillaume Evin, Damien Raynaud, and Thierry Faug
Nat. Hazards Earth Syst. Sci., 23, 3509–3523, https://doi.org/10.5194/nhess-23-3509-2023, https://doi.org/10.5194/nhess-23-3509-2023, 2023
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This paper deals with an exceptional snow and rain event in a Mediterranean region of France which is usually not prone to heavy snowfall and its consequences on a particular building that collapsed completely. Independent analyses of the meteorological episode are carried out, and the response of the building to different snow and rain loads is confronted to identify the main critical factors that led to the collapse.
Erwan Le Roux, Guillaume Evin, Raphaëlle Samacoïts, Nicolas Eckert, Juliette Blanchet, and Samuel Morin
The Cryosphere, 17, 4691–4704, https://doi.org/10.5194/tc-17-4691-2023, https://doi.org/10.5194/tc-17-4691-2023, 2023
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We assess projected changes in snowfall extremes in the French Alps as a function of elevation and global warming level for a high-emission scenario. On average, heavy snowfall is projected to decrease below 3000 m and increase above 3600 m, while extreme snowfall is projected to decrease below 2400 m and increase above 3300 m. At elevations in between, an increase is projected until +3 °C of global warming and then a decrease. These results have implications for the management of risks.
Kaltrina Maloku, Benoit Hingray, and Guillaume Evin
Hydrol. Earth Syst. Sci., 27, 3643–3661, https://doi.org/10.5194/hess-27-3643-2023, https://doi.org/10.5194/hess-27-3643-2023, 2023
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High-resolution precipitation data, needed for many applications in hydrology, are typically rare. Such data can be simulated from daily precipitation with stochastic disaggregation. In this work, multiplicative random cascades are used to disaggregate time series of 40 min precipitation from daily precipitation for 81 Swiss stations. We show that very relevant statistics of precipitation are obtained when precipitation asymmetry is accounted for in a continuous way in the cascade generator.
Juliette Blanchet, Alix Reverdy, Antoine Blanc, Jean-Dominique Creutin, Périne Kiennemann, and Guillaume Evin
Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2023-197, https://doi.org/10.5194/hess-2023-197, 2023
Revised manuscript not accepted
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The Alpine region is strongly affected by torrential floods, sometimes leading to severe negative impacts on society, economy, and the environment. Understanding such natural hazards and their drivers is essential to mitigate related risks. In this article we study the atmospheric conditions at the origin of damaging torrential events in the Northern French Alps over the long run, using a database of reported occurrence of damaging torrential flooding in the Grenoble conurbation since 1851.
Sebastien Klotz, Caroline Le Bouteiller, Nicolle Mathys, Firmin Fontaine, Xavier Ravanat, Jean-Emmanuel Olivier, Frédéric Liébault, Hugo Jantzi, Patrick Coulmeau, Didier Richard, Jean-Pierre Cambon, and Maurice Meunier
Earth Syst. Sci. Data, 15, 4371–4388, https://doi.org/10.5194/essd-15-4371-2023, https://doi.org/10.5194/essd-15-4371-2023, 2023
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Mountain badlands are places of intense erosion. They deliver large amounts of sediment to river systems, with consequences for hydropower sustainability, habitat quality and biodiversity, and flood hazard and river management. Draix-Bleone Observatory was created in 1983 to understand and quantify sediment delivery from such badland areas. Our paper describes how water and sediment fluxes have been monitored for almost 40 years in the small mountain catchments of this observatory.
Laurent Strohmenger, Eric Sauquet, Claire Bernard, Jérémie Bonneau, Flora Branger, Amélie Bresson, Pierre Brigode, Rémy Buzier, Olivier Delaigue, Alexandre Devers, Guillaume Evin, Maïté Fournier, Shu-Chen Hsu, Sandra Lanini, Alban de Lavenne, Thibault Lemaitre-Basset, Claire Magand, Guilherme Mendoza Guimarães, Max Mentha, Simon Munier, Charles Perrin, Tristan Podechard, Léo Rouchy, Malak Sadki, Myriam Soutif-Bellenger, François Tilmant, Yves Tramblay, Anne-Lise Véron, Jean-Philippe Vidal, and Guillaume Thirel
Hydrol. Earth Syst. Sci., 27, 3375–3391, https://doi.org/10.5194/hess-27-3375-2023, https://doi.org/10.5194/hess-27-3375-2023, 2023
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We present the results of a large visual inspection campaign of 674 streamflow time series in France. The objective was to detect non-natural records resulting from instrument failure or anthropogenic influences, such as hydroelectric power generation or reservoir management. We conclude that the identification of flaws in flow time series is highly dependent on the objectives and skills of individual evaluators, and we raise the need for better practices for data cleaning.
Cécile Duvillier, Nicolas Eckert, Guillaume Evin, and Michael Deschâtres
Nat. Hazards Earth Syst. Sci., 23, 1383–1408, https://doi.org/10.5194/nhess-23-1383-2023, https://doi.org/10.5194/nhess-23-1383-2023, 2023
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This study develops a method that identifies individual potential release areas (PRAs) of snow avalanches based on terrain analysis and watershed delineation and demonstrates its efficiency in the French Alps context using an extensive cadastre of past avalanche limits. Results may contribute to better understanding local avalanche hazard. The work may also foster the development of more efficient PRA detection methods based on a rigorous evaluation scheme.
Suzanne Lapillonne, Firmin Fontaine, Frédéric Liebault, Vincent Richefeu, and Guillaume Piton
Nat. Hazards Earth Syst. Sci., 23, 1241–1256, https://doi.org/10.5194/nhess-23-1241-2023, https://doi.org/10.5194/nhess-23-1241-2023, 2023
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Debris flows are fast flows most often found in torrential watersheds. They are composed of two phases: a liquid phase which can be mud-like and a granular phase, including large boulders, transported along with the flow. Due to their destructive nature, accessing features of the flow, such as velocity and flow height, is difficult. We present a protocol to analyse debris flow data and results of the Réal torrent in France. These results will help experts in designing models.
Juliette Blanchet, Alix Reverdy, Antoine Blanc, Jean-Dominique Creutin, Périne Kiennemann, and Guillaume Evin
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2022-276, https://doi.org/10.5194/nhess-2022-276, 2023
Manuscript not accepted for further review
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We study the atmospheric conditions at the origin of damaging torrential events in the Northern French Alps over the long run. We consider seven atmospheric variables that describe the nature of the air masses involved and the possible triggers of precipitation and we try to isolate the most discriminating variables. The results show that humidity and particularly humidity transport plays the greatest role under westerly flows while instability potential is mostly at play under southerly flows.
Daniel Viviroli, Anna E. Sikorska-Senoner, Guillaume Evin, Maria Staudinger, Martina Kauzlaric, Jérémy Chardon, Anne-Catherine Favre, Benoit Hingray, Gilles Nicolet, Damien Raynaud, Jan Seibert, Rolf Weingartner, and Calvin Whealton
Nat. Hazards Earth Syst. Sci., 22, 2891–2920, https://doi.org/10.5194/nhess-22-2891-2022, https://doi.org/10.5194/nhess-22-2891-2022, 2022
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Estimating the magnitude of rare to very rare floods is a challenging task due to a lack of sufficiently long observations. The challenge is even greater in large river basins, where precipitation patterns and amounts differ considerably between individual events and floods from different parts of the basin coincide. We show that a hydrometeorological model chain can provide plausible estimates in this setting and can thus inform flood risk and safety assessments for critical infrastructure.
Erwan Le Roux, Guillaume Evin, Nicolas Eckert, Juliette Blanchet, and Samuel Morin
Earth Syst. Dynam., 13, 1059–1075, https://doi.org/10.5194/esd-13-1059-2022, https://doi.org/10.5194/esd-13-1059-2022, 2022
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Anticipating risks related to climate extremes is critical for societal adaptation to climate change. In this study, we propose a statistical method in order to estimate future climate extremes from past observations and an ensemble of climate change simulations. We apply this approach to snow load data available in the French Alps at 1500 m elevation and find that extreme snow load is projected to decrease by −2.9 kN m−2 (−50 %) between 1986–2005 and 2080–2099 for a high-emission scenario.
Coline Ariagno, Caroline Le Bouteiller, Peter van der Beek, and Sébastien Klotz
Earth Surf. Dynam., 10, 81–96, https://doi.org/10.5194/esurf-10-81-2022, https://doi.org/10.5194/esurf-10-81-2022, 2022
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The
critical zonenear the surface of the Earth is where geologic substrate, erosion, climate, and life meet and interact. This study focuses on mechanisms of physical weathering that produce loose sediment and make it available for transport. We show that the sediment export from a monitored catchment in the French Alps is modulated by frost-weathering processes and is therefore sensitive to complex modifications in a warming climate.
Guillaume Evin, Samuel Somot, and Benoit Hingray
Earth Syst. Dynam., 12, 1543–1569, https://doi.org/10.5194/esd-12-1543-2021, https://doi.org/10.5194/esd-12-1543-2021, 2021
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This research paper proposes an assessment of mean climate change responses and related uncertainties over Europe for mean seasonal temperature and total seasonal precipitation. An advanced statistical approach is applied to a large ensemble of 87 high-resolution EURO-CORDEX projections. For the first time, we provide a comprehensive estimation of the relative contribution of GCMs and RCMs, RCP scenarios, and internal variability to the total variance of a very large ensemble.
Guillaume Evin, Matthieu Lafaysse, Maxime Taillardat, and Michaël Zamo
Nonlin. Processes Geophys., 28, 467–480, https://doi.org/10.5194/npg-28-467-2021, https://doi.org/10.5194/npg-28-467-2021, 2021
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Forecasting the height of new snow is essential for avalanche hazard surveys, road and ski resort management, tourism attractiveness, etc. Météo-France operates a probabilistic forecasting system using a numerical weather prediction system and a snowpack model. It provides better forecasts than direct diagnostics but exhibits significant biases. Post-processing methods can be applied to provide automatic forecasting products from this system.
Erwan Le Roux, Guillaume Evin, Nicolas Eckert, Juliette Blanchet, and Samuel Morin
The Cryosphere, 15, 4335–4356, https://doi.org/10.5194/tc-15-4335-2021, https://doi.org/10.5194/tc-15-4335-2021, 2021
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Extreme snowfall can cause major natural hazards (avalanches, winter storms) that can generate casualties and economic damage. In the French Alps, we show that between 1959 and 2019 extreme snowfall mainly decreased below 2000 m of elevation and increased above 2000 m. At 2500 m, we find a contrasting pattern: extreme snowfall decreased in the north, while it increased in the south. This pattern might be related to increasing trends in extreme snowfall observed near the Mediterranean Sea.
Cited articles
Altmann, M., Haas, F., Heckmann, T., Liébault, F., and Becht, M.: Modelling of sediment supply from torrent catchments in the Western Alps using the sediment contributing area (SCA) approach, Earth Surf. Proc. Land., 46, 889–906, https://doi.org/10.1002/esp.5046, 2021. a, b, c
Anderson, H. W.: Flood frequencies and sedimentation from forest watersheds,
Eos, Transactions American Geophysical Union, 30, 567–586, 1949. a
Arabkhedri, M., Heidary, K., and Parsamehr, M.-R.: Relationship of sediment
yield to connectivity index in small watersheds with similar erosion
potentials, J. Soil. Sediment., 21, 2699–2708,
https://doi.org/10.1007/s11368-021-02978-z, 2021. a
Beck, H. E., Zimmermann, N. E., McVicar, T. R., Vergopolan, N., Berg, A., and
Wood, E. F.: Present and future Köppen-Geiger climate classification
maps at 1-km resolution, Sci. Data, 5, 180214,
https://doi.org/10.1038/sdata.2018.214, 2018. a
Bertrand, M., Liébault, F., and Piégay, H.: Debris-flow susceptibility of
upland catchments, Nat. Hazards, 67, 497–511, https://doi.org/10.1007/s11069-013-0575-4, 2013. a, b, c, d
Blanpied, J., Carozza, J.-M., and Antoine, J.-M.: La connectivité
sédimentaire dans la haute chaîne pyrénéenne par l’analyse de la crue
de juin 2013: le rôle des formations superficielles, Géomorphologie:
relief, processus, Environnement, 24, 389–402,
https://doi.org/10.4000/geomorphologie.12718, 2018. a
Borselli, L., Cassi, P., and Torri, D.: Prolegomena to sediment and flow
connectivity in the landscape: A GIS and field numerical assessment,
CATENA, 75, 268–277, https://doi.org/10.1016/j.catena.2008.07.006, number: 3, 2008. a, b
Breiman, L.: Random Forests, Mach. Learn., 45, 5–32,
https://doi.org/10.1023/A:1010933404324, 2001. a
Caillaud, C., Somot, S., Alias, A., Bernard-Bouissières, I., Fumière, Q.,
Laurantin, O., Seity, Y., and Ducrocq, V.: Modelling Mediterranean heavy
precipitation events at climate scale: an object-oriented evaluation of the
CNRM-AROME convection-permitting regional climate model, Clim.
Dynam., 56, 1717–1752, https://doi.org/10.1007/s00382-020-05558-y, 2021. a
Carladous, S., Piton, G., Kuss, D., Charvet, G., Paulhe, R., Morel, M., and
Quefféléan, Y.: Chap. 13: French Experience with Open Check Dams:
Inventory and Lessons Learnt Through Adaptive Management, in:
Check Dam Construction for Sustainable Watershed Management and
Planning, 247–266, Wiley Online Library, https://doi.org/10.1002/9781119742449.ch13, 2022. a
Carriere, A., Le Bouteiller, C., Tucker, G. E., Klotz, S., and Naaim, M.:
Impact of vegetation on erosion: Insights from the calibration and test of a
landscape evolution model in alpine badland catchments,
Earth Surf. Proc. Land., 45, 1085–1099, https://doi.org/10.1002/esp.4741, 2020. a
Cavalli, M., Trevisani, S., Comiti, F., and Marchi, L.: Geomorphometric
assessment of spatial sediment connectivity in small Alpine catchments,
Geomorphology, 188, 31–41, https://doi.org/10.1016/j.geomorph.2012.05.007, 2013. a, b, c, d
Cerda, A.: Parent material and vegetation affect soil erosion in eastern Spain,
Soil Sci. Soc. Am. J., 63, 362–368,
https://doi.org/10.2136/sssaj1999.03615995006300020014x, 1999. a
Church, M. and Jakob, M.: What Is a Debris Flood?, Water Resour. Res.,
56, e2020WR027144, https://doi.org/10.1029/2020WR027144, 2020. a
Coles, S.: An introduction to statistical modeling of extreme values, vol. 208, Springer, https://doi.org/10.1007/978-1-4471-3675-0, 2001. a, b
Crema, S. and Cavalli, M.: SedInConnect: a stand-alone, free and open source
tool for the assessment of sediment connectivity, Comput. Geosci.,
111, 39–45, https://doi.org/10.1016/j.cageo.2017.10.009, 2018. a, b
Crema, S., Llena, M., Calsamiglia, A., Estrany, J., Marchi, L., Vericat, D.,
and Cavalli, M.: Can inpainting improve digital terrain analysis? Comparing
techniques for void filling, surface reconstruction and geomorphometric
analyses, Earth Surf. Proc. Land., 45, 736–755,
https://doi.org/10.1002/esp.4739, 2020. a, b
D'Agostino, V.: Assessment of past torrential events through historical
sources, in: Dating Torrential Processes on Fans and Cones, edited by:
Schneuwly-Bollschweiler, M., Stoffel, M., and Rudolf-Miklau, F., vol. 47,
chap. 8, 131–146, Springer Netherlands, https://doi.org/10.1007/978-94-007-4336-6,
2013. a, b, c
D'Agostino, V. and Bertoldi, G.: On the assessment of the management priority
of sediment source areas in a debris-flow catchment: Management priority of
sediment source areas in debris-flow catchment, Earth Surf. Proc. Land., 39, 656–668, https://doi.org/10.1002/esp.3518, 2014. a
D'Agostino, V., Cerato, M., and Coali, R.: Extreme events of sediment transport in the eastern Trentino torrents, in: Proceedings of the International Symposium Interpraevent, Garmisch-Partenkirchen, Germany, 24–28 June 1996, International Research Society INTERPRAEVENT, 377–386, http://www.interpraevent.at/palm-cms/upload_files/Publikationen/Tagungsbeitraege/1996_1_377.pdf (last access: 10 May 2023), 1996. a, b
de Vente, J., Verduyn, R., Verstraeten, G., Vanmaercke, M., and Poesen, J.: Factors controlling sediment yield at the catchment scale in NW Mediterranean
geoecosystems, J. Soil. Sediment., 11, 690–707,
https://doi.org/10.1007/s11368-011-0346-3, 2011. a
Franzi, L. and Bianco, G.: A statistical method to predict debris flow
deposited volumes on a debris fan,
Phys. Chem. Earth Pt. C, 26, 683–688, 2001. a
Fryirs, K. A.: (Dis)Connectivity in catchment sediment cascades: a fresh look
at the sediment delivery problem, Earth Surf. Proc. Land., 38,
30–46, https://doi.org/10.1002/esp.3242, 2013. a, b
Gob, F., Bilodeau, C., Thommeret, N., Belliard, J., Albert, M.-B., Tamisier,
V., Baudoin, J.-M., and Kreutzenberger, K.: A tool for the characterisation
of the hydromorphology of rivers in line with the application of the European
Water Framework Directive in France (CARHYCE), Geomorphologie, 20, 57–72, https://doi.org/10.4000/geomorphologie.10497,
number: 1, 2014. a
Haas, F., Heckmann, T., Wichmann, V., and Becht, M.: Quantification and
Modeling of Fluvial Bedload Discharge from Hillslope Channels in
two Alpine Catchments (Bavarian Alps, Germany), Z. Geomorphologie, 55, 147–168,
https://doi.org/10.1127/0372-8854/2011/0055S3-0056, 2011. a
Harvey, A. M.: Effective timescales of coupling within fluvial systems,
Geomorphology, 44, 175–201, https://doi.org/10.1016/S0169-555X(01)00174-X, 2002. a, b
Heckmann, T., Cavalli, M., Cerdan, O., Foerster, S., Javaux, M., Lode, E.,
Smetanová, A., Vericat, D., and Brardinoni, F.: Indices of sediment
connectivity: opportunities, challenges and limitations, Earth-Sci.
Rev., 187, 77–108, https://doi.org/10.1016/j.earscirev.2018.08.004, 2018. a, b, c, d
Hungr, O., Morgan, G. C., and Kellerhals, R.: Quantitative analysis of debris
torrent hazards for design of remedial measures, Can. Geotech. J., 21, 663–677, https://doi.org/10.1139/t84-073, 1984. a, b
Hübl, J.: Conceptual Framework for Sediment Management in Torrents,
Water, 10, 1718, https://doi.org/10.3390/w10121718, 2018. a, b
Jakob, M.: Debris-Flow Hazard Assessments: A Practitioner's View,
Environmental and Engineering Geoscience, 27, 153–166,
https://doi.org/10.2113/EEG-D-20-00110, 2021. a, b
Jakob, M. and Friele, P.: Frequency and magnitude of debris flows on Cheekye
River, British Columbia, Geomorphology, 114, 382–395,
https://doi.org/10.1016/j.geomorph.2009.08.013, 2010. a
Jakob, M., Davidson, S., Bullard, G., Busslinger, M., Collier‐Pandya, B., Grover, P., and Lau, C.: Debris‐Flood Hazard Assessments in Steep Streams, Water Resour. Res., 58, e2021WR030907, https://doi.org/10.1029/2021WR030907, 2022. a
Kaitna, R. and Hübl, J.: Silent Witnesses For Torrential Processes, in:
Dating Torrential Processes on Fans and Cones, edited by:
Schneuwly-Bollschweiler, M., Stoffel, M., and Rudolf-Miklau, F., vol. 47,
chap. 7, 111–130, Springer Netherlands,
https://doi.org/10.1007/978-94-007-4336-6_7, 2012. a
Kronfellner-Kraus, G.: Extreme Feststofffrachten und Grabenbildungen von Wildbächen, Internationales Symposion Interpraevent, Villach, Austria, 6–9 June 1984, International Research Society INTERPRAEVENT, 109–118, http://www.interpraevent.at/palm-cms/upload_files/Publikationen/Tagungsbeitraege/1984_2_109.pdf (last access: 10 May 2023), 1984. a
Marchi, L. and Cavalli, M.: Procedures for the documentation of historical debris flows: Application to the Chieppena Torrent (Italian Alps),
Environ. Manage., 40, 493–503, https://doi.org/10.1007/s00267-006-0288-5,
2007. a, b
Marchi, L. and Crema, S.: Data on debris-flow volumes in northeastern Italy, PANGAEA [data set], https://doi.org/10.1594/PANGAEA.896595, 2018. a
Marchi, L., Brunetti, M. T., Cavalli, M., and Crema, S.: Debris‐flow volumes
in northeastern Italy: Relationship with drainage area and size
probability, Earth Surf. Proc. Land., 44, 933–943,
https://doi.org/10.1002/esp.4546, 2019. a, b
Martini, L., Baggio, T., Torresani, L., Crema, S., and Cavalli, M.: R_IC: A
novel and versatile implementation of the index of connectivity in R,
Environ. Modell. Softw., 155, 105446,
https://doi.org/10.1016/j.envsoft.2022.105446, 2022. a
Melton, M. A.: The Geomorphic and Paleoclimatic Significance of Alluvial
Deposits in Southern Arizona, J. Geol., 73, 1–38, 1965. a
Micheletti, N. and Lane, S. N.: Water yield and sediment export in small,
partially glaciated Alpine watersheds in a warming climate,
Water Resour. Res., 52, 4924–4943, https://doi.org/10.1002/2016WR018774, 2016. a
Mishra, A. K., Placzek, C., and Jones, R.: Coupled influence of precipitation
and vegetation on millennial-scale erosion rates derived from 10Be, PLOS ONE,
14, 1–20, https://doi.org/10.1371/journal.pone.0211325, 2019. a
Morel, M., Booker, D. J., Gob, F., and Lamouroux, N.: Intercontinental
predictions of river hydraulic geometry from catchment physical
characteristics, J. Hydrol., 582, 124292,
https://doi.org/10.1016/j.jhydrol.2019.124292, 2020. a
Morel, M., Piton, G., Evin, G., and Le Bouteiller, C.: Projet HYDRODEMO: Évaluation de l'aléa torrentiel dans les petits bassins versants des Alpes du Nord – Action 3: Caractériser la production sédimentaire, Research Report, INRAE, https://hal.archives-ouvertes.fr/hal-03549827 (last access: 10 May 2023), 2022. a, b
Moriasi, D. N., Arnold, J. G., Van Liew, M. W., Bingner, R. L., Harmel, R. D.,
and Veith, T. L.: Model Evaluation Guidelines for Systematic Quantification
of Accuracy in Watershed Simulations, T. ASABE, 50,
885–900, https://doi.org/10.13031/2013.23153, 2007. a
Peteuil, C. and Liébault, F.: ECSTReM, une méthode pratique pour prédire
la production sédimentaire an-nuelle et événementielle des torrents à
partir d’observations originales spécifiques aux Alpes françaises, in:
Proc. of the Colloque Eaux en Montagne de la Société Hydrotechnique de
France, Lyon, France, 16–17 March 2011, Société Hydrotechnique de France, 6, https://hal.archives-ouvertes.fr/hal-00615485 (last access: 10 May 2023), 2011. a, b
Peteuil, C., Liébault, F., and Marco, O.: ECSTREM, une approche pratique pour prédire la production sédimentaire des torrents des Alpes françaises, in: Proc. of the International Symposium Interpraevent, Grenoble, France, 23–26 April 2012, International Research Society INTERPRAEVENT, 293–304, http://www.interpraevent.at/palm-cms/upload_files/Publikationen/Tagungsbeitraege/2012_1_293.pdf (last access: 10 May 2023), 2012. a
Piton, G. and Morel, M.: Projet HYDRODEMO: Évaluation de l'aléa torrentiel dans les petits bassins versants des Alpes du Nord Dataverse, Recherche Data Gouv [data set], https://entrepot.recherche.data.gouv.fr/dataverse/HydroDemo (last access: 10 May 2023), 2022. a
Piton, G., Carladous, S., Recking, A., Liebault, F., Tacnet, J., Kuss, D.,
Quefféléan, Y., and Marco, O.: Why do we build check dams in Alpine
streams? An historical perspective from the French experience, Earth Surf. Proc. Land., 42, 91–108, https://doi.org/10.1002/esp.3967, 2017. a, b
R Core Team: R: A Language and Environment for Statistical Computing, R
Foundation for Statistical Computing, Vienna, Austria,
https://www.R-project.org/ (last access: 10 May 2023), 2020. a
Rickenmann, D.: Estimation des laves torrentielles, IAS – Ingenieurs et
Architectes Suisses, 19, 386–392, 1997. a
Rickenmann, D. and Koschni, A.: Sediment loads due to fluvial transport and
debris flows during the 2005 flood events in Switzerland, Hydrol.
Process., 24, 993–1007, https://doi.org/10.1002/hyp.7536, 2010. a, b, c
Rudolf-Miklau, F. and Suda, J.: Chap. 26 – Design Criteria for Torrential
Barriers, in: Dating Torrential Processes on Fans and Cones, edited
by: Schneuwly-Bollschweiler, M., Stoffel, M., and Rudolf-Miklau, F., vol. 47, Advances in Global Change Research, 375–389, Springer
Netherlands, https://doi.org/10.1007/978-94-007-4336-6_26,
2013. a
Schopper, N., Mergili, M., Frigerio, S., Cavalli, M., and Poeppl, R.: Analysis
of lateral sediment connectivity and its connection to debris flow intensity
patterns at different return periods in the Fella River system in
northeastern Italy, Sci. Total Environ., 658, 1586–1600,
https://doi.org/10.1016/j.scitotenv.2018.12.288, 2019. a
Takei, A.: Interdependence of sediment budget between individual torrents and a river-system, in: International Symposium Interpraevent, 35–48, Villach Austria, 6–9 June 1984, International Research Society INTERPRAEVENT, http://www.interpraevent.at/palm-cms/upload_files/Publikationen/Tagungsbeitraege/1984_2_35.pdf (last access: 10 May 2023), 1984. a, b
Theule, J. I., Liébault, F., Loye, A., Laigle, D., and Jaboyedoff, M.: Sediment budget monitoring of debris-flow and bedload transport in the Manival Torrent, SE France, Nat. Hazards Earth Syst. Sci., 12, 731–749, https://doi.org/10.5194/nhess-12-731-2012, 2012.
a
Torresani, L., D'Agostino, V., and Piton, G.: Deciphering sediment
Connectivity Index and erosion pattern in a debris flow catchment, in:
Proc. 14th INTERPRAEVENT Congress, Bergen, Norway, 31 May–3 June 2021, 303–311, International Research Society INTERPRAEVENT,
https://hal.archives-ouvertes.fr/hal-03363334/ (last access: 10 May 2023), 2021. a
Vanacker, V., von Blanckenburg, F., Govers, G., Molina, A., Poesen, J.,
Deckers, J., and Kubik, P.: Restoring dense vegetation can slow mountain
erosion to near natural benchmark levels, Geology, 35, 303–306,
https://doi.org/10.1130/G23109A.1, 2007. a
Zeller, J.: Schutz vor Hochwasserschaden und Rutschungen im Gebirge, ein
Überblick, Schweizerische Zeitschrift für Forstwesen, 127, 129–137, 1976. a
Short summary
In mountain catchments, damage during floods is generally primarily driven by the supply of a massive amount of sediment. Predicting how much sediment can be delivered by frequent and infrequent events is thus important in hazard studies. This paper uses data gathered during the maintenance operation of about 100 debris retention basins to build simple equations aiming at predicting sediment supply from simple parameters describing the upstream catchment.
In mountain catchments, damage during floods is generally primarily driven by the supply of a...
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