Design of sediment detention basins: Scaled model experiments and application  

作　　者：Anita Moldenhauer-Roth Guillaume Piton Sebastian Schwindt Mona Jafarnejad Anton JSchleiss 

机构地区：[1]Hydraulic Constructions Platform(PL-LCH),Swiss Federal Institute of Technology Lausanne(EPFL),Station 18,CH-1015,Lausanne,Switzerland [2]Universite Grenoble Alpes,Institut National de Recherche en Sciences et Technologies Pour L'environnement et L'agriculture(IRSTEA),UR ETNA,Grenoble,France

出　　处：《International Journal of Sediment Research》2021年第1期136-150,共15页国际泥沙研究（英文版）

基　　金：This work was funded by the Swiss Federal Office for the Environment(SFOEN)under the Sediment and Habitat Dynamics research project.The participation of G.P.was funded by the H2020 project NAIAD(Grant No.730497)from the European Union's Horizon 2020 research and innovation program.

摘　　要：Sediment detention basins are implemented on mountain rivers to trap solid material that may aggravate the flooding of downstream settlements.However,retention structures built in the past may unnecessarily retain sediment during non-hazardous flood events,resulting in high maintenance costs and sediment deficit downstream.In addition,the so-called spontaneous self-flushing of previously retained sediment during floods has occasionally been observed.Recent research suggests to design sediment detention basins for controlling sediment passage with a guiding channel across the deposition area upstream of a hybrid barrier.Such 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 control.The 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 heights.Improved design criteria are provided regarding the bar screen and the basin storage capacity.The 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 

分 类 号：TV149[水利工程—水力学及河流动力学]