Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-376
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
01 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Experimental study of sediment traps permeable for frequent floods
Sebastian Schwindt1,2, Mário J. Franca1,3, Alessandro Reffo4, and Anton J. Schleiss1 1Laboratory of Hydraulic Constructions (LCH), École polytechnique fédérale de Lausanne (EPFL), Lausanne, 1015, Lausanne, Switzerland
2Department of Land, Air and Water Resources, UC Davis, Davis, 5 95616, California, USA
3River Basin Development, IHE Delft Institute for Water Education, Delft, 2611, the Netherlands
4University of Trento, Trento, 38050, Italy
Abstract. Sediment traps created by partially open torrential barriers are crucial elements for flood protection in alpine regions. The trapping of sediment is necessary when intense sediment transport occurs during floods that may endanger urban areas at downstream river reaches. In turn, the unwanted permanent trapping of sediment during small, non-hazardous floods can result in the ecological and morphological depletion of downstream reaches. This study experimentally analyses a new concept for permeable sediment traps. For ensuring the sediment transfer up to small floods, a guiding channel implemented in the deposition area of the sediment trap was studied systematically. The bankfull discharge of the guiding channel corresponds to a dominant morphological discharge. At the downstream end of the guiding channel, a permeable barrier triggers sediment retention and deposition. The permeable barrier consists of a bar screen for mechanical deposition control, superposed to a flow constriction for the hydraulic control. The fail-safe clogging of the barrier and the sediment deposition upstream can be ensured for discharges that are higher than the bankfull discharge of the guiding channel.

Citation: Schwindt, S., Franca, M. J., Reffo, A., and Schleiss, A. J.: Experimental study of sediment traps permeable for frequent floods, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-376, in review, 2017.
Sebastian Schwindt et al.
Sebastian Schwindt et al.

Data sets

Hydro-morphological processes through permeable sediment traps at mountain rivers
S. Schwindt
https://doi.org/10.5075/epfl-lchcomm-71
Sebastian Schwindt et al.

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Short summary
Mountain rivers can mobilize important amounts of sediment that can endanger downstream dwellers and infrastructure during floods. Therefore, sediment traps are built immediately upstream of urban areas to retain hazardous sediment. However, many sediment traps retain too much sediment that is then missing in downstream river sections, leading to their eco-morphological depletion. This study proposes an experimental research-based solution to improve sediment traps using a guiding channel.
Mountain rivers can mobilize important amounts of sediment that can endanger downstream dwellers...
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