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Morphodynamics and sediment connectivity index in an unmanaged,debris-flow prone catchment:a through time perspective

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Journal of Mountain Science 2023年第4期20卷 891-910页

作者： Loris TORRESANI guillaume piton Vincenzo D’AGOSTINO Department of Land EnvironmentAgriculture and ForestryUniversity of PadovaAgripolisViale dell'Università1635020 Legnaro(PD)Italy UniversitéGrenoble Alpes INRAECNRSIRDGrenoble INPIGE38000 GrenobleFrance

Torrential processes are among the main actors responsible for sediment production and mobility in mountain *** this reason,the understanding of preferential pathways for sediment routing has become a priority in hazard assessment and *** this context,the sediment Connectivity Index(IC)enables to analyse the existing linkage between sediment sources and the selected target(channel network or catchment outlet).The IC is a grid-based index that allows fast computation of sediment connectivity based on landscape information derived from a single Digital Terrain Model(DTM).The index computation is based on the log-ratio between an upslope and a downslope component,including information about drainage area,slope,terrain roughness,and distance to the analysis target(***).The output is a map that highlights the degree of structural connectivity of sediment pathways over analysed *** now,these maps are however rarely used to help defining debris-flow hazard maps,notably due to a lack of guidelines to interpret the IC spatial *** paper proposes an exploitation procedure along profiles to extract more information from the analysis of mapped IC *** methodology relies on the analysis of the IC and its component variables along the main channel profile,integrated with information about sediment budgeting derived from Difference of DEMs(DoD).The study of connectivity was applied in the unmanaged sub-catchment(without torrent control works)of the Rio Soial(Autonomous Province of Trento–NE Italy)to understanding the geomorphic evolution of the area after five debris flows(in ten years)and the related changes of sediment *** a recent DTM as validation,we demonstrated how an IC analysis over the older DTM can help predicting geomorphic changes and associated *** results show an IC aptitude to capture geomorphic trajectories,anticipate debris flow deposits in a specific channel location,and depict pre

关键词： Sediment Connectivity Index Debris flow Hazard assessment Digital Elevation Model Geomorphic evolution DEMs of Difference

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Design of sediment detention basins: Scaled model experiments and application

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International Journal of Sediment Research 2021年第1期36卷 136-150页

作者： Anita Moldenhauer-Roth guillaume piton Sebastian Schwindt Mona Jafarnejad Anton J.Schleiss Hydraulic Constructions Platform (PL-LCH) Swiss Federal Institute of Technology Lausanne (EPFL) Université Grenoble Alpes Institut National de Recherche en Sciences et Technologies Pour L'environnement et L'agriculture (IRSTEA)

Sediment detention basins are implemented on mountain rivers to trap solid material that may aggravate the flooding of downstream ***,retention structures built in the past may unnecessarily retain sediment during non-hazardous flood events,resulting in high maintenance costs and sediment deficit *** addition,the so-called spontaneous self-flushing of previously retained sediment during floods has occasionally been *** research suggests to design sediment detention basins for controlling sediment passage with a guiding channel across the deposition area upstream of a hybrid *** barriers consist of a check dam with a slot orifice and an upstream bar screen with a bottom clearance in order to benefit from a combined mechanical-hydraulic retention *** present paper enhances this pioneering research with the help of new experimental data,including a wide range of sediment mixtures and large wood,as well as variable barrier *** design criteria are provided regarding the bar screen and the basin storage *** functionality of the enhanced concept for sediment detention is illustrated by a case study on a physical model:the protection of the Villard-Bonnot village(France) against torrential hazards.

关键词： Sediment continuity Sediment trap Bedload Open check dam Sediment flushing

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