Rational Criterion for Designing Opening of Slit-Check Dam

Armanini, Aronne; Larcher, Michele

doi:10.1061/(asce)0733-9429(2001)127:2(94)

Cited by 97 publications

(73 citation statements)

References 2 publications

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“…The focus of the study was the optimization of the outlet area of the first retention structure. Other work on mitigation measures for torrent catchments concentrates on design criteria for the geometry of open silt-check dams (Armanini and Larcher, 2001), morphologic changes due to construction of check dams (Busnelli et al, 2001;Conesa-García et al, 2007) and impact on vegetation due to check dam construction (Bombino et al, 2009). Our study investigated the spatial deposition of bedload on a wider area without significant change of the inflow hydrograph.…”

Section: Discussionmentioning

confidence: 99%

Physical and numerical modelling of a bedload deposition area for an Alpine torrent

Kaitna

Chiari

Kerschbaumer

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. Floods including intensive bedload transport represent a severe hazard to the often densely populated alluvial fans of small Alpine watersheds. In order to minimize the risk of future inundation, an existing bedload deposition area on the fan upstream of the village Vorderberg in southern Austria is planned for reconstruction. The suggested concept for protection measures includes dividing the area into three similar sections of reduced slope. The three sections are to be separated by a block ramp. To test this concept and to optimize the sedimentation process, an analysis was performed by using both a physical scale model (1:30) and a numerical simulation tool (SETRAC). Four configurations for the section-outlet were tested based on three flood scenarios. The results support the general protection concept and suggest a minimum construction configuration, including a woody debris filter. Employing a physical scale model for analysing small watershed processes is rarely found in literature. This contribution represents an applied study and provides quantitative information on bedload deposition and outflow from a deposition area. We test a novel simulation tool for bedload transport on the steep slopes against the measurements in the laboratory and show that the combination of physical and numerical modelling is a valuable tool to evaluate the efficiency of planned measures for torrent hazard mitigation.

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Section: Discussionmentioning

confidence: 99%

Physical and numerical modelling of a bedload deposition area for an Alpine torrent

Kaitna

Chiari

Kerschbaumer

et al. 2011

Nat. Hazards Earth Syst. Sci.

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“…hydraulic control, the bed load settles in the backwater, immediately downstream of the hydraulic jump, and forms a delta-like deposit. For coarse bed load, the deposit evolves in the upstream direction; for fine bed load, the deposit evolves in the downstream direction (Armanini and Larcher, 2001;Campisano et al, 2014;Jordan et al, 2003). The mechanical clogging of the barrier causes a hydraulic jump immediately upstream of the barrier.…”

Section: Sediment Deposition Processes and Controlsmentioning

confidence: 99%

“…4 b and c). 30 The design criteria for torrential barriers regarding the discharge capacity and the effects on bed load transport have been derived in previous studies from flume observations with constraint, monotone channel morphology (Armanini and Larcher, 2001;Recking, 2016a, 2016b;Schwindt et al, 2017a). The guiding channel (A in Fig.…”

Section: Deposition Area With Guiding Channelmentioning

confidence: 99%

“…• The duration of the falling limb t ̱ (in s) is 1.7 times as long as the rising limb t ̟ (in s), which is typical for floods of mountain rivers (Armanini and Larcher, 2001;D'Agostino and Lenzi, 1996;Kaitna et al, 2011;Piton and Recking, 2016a;Rickenmann et al, 1998); 30 Nat. Hazards Earth Syst.…”

Section: Experimental Procedures 25mentioning

confidence: 99%

“…The continuous reshaping lead to a gradual incision of the deposit along the longitudinal axis of the initial riverbed (Armanini and Larcher, 2001;Busnelli et al, 2001;Piton and Recking, 2016a;Zollinger, 1983). This observation was not made in the present study, as apparent grain imbrication caused the armouring of the surface 15 layer of the deposit.…”

Section: Sediment Flushingmentioning

confidence: 99%

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Experimental study of sediment traps permeable for frequent floods

Schwindt

Franca

Reffo

et al. 2017

Preprint

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Abstract. Sediment traps created by partially open torrential barriers are crucial elements for flood protection in alpine regions. 10The 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 15 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.

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Mountain Streams

Armanini

2005

Encyclopedia of Hydrological Sciences

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Rational Criterion for Designing Opening of Slit-Check Dam

Cited by 97 publications

References 2 publications

Physical and numerical modelling of a bedload deposition area for an Alpine torrent

Physical and numerical modelling of a bedload deposition area for an Alpine torrent

Experimental study of sediment traps permeable for frequent floods

Mountain Streams

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