Are Torrent Check-Dams Potential Debris-Flow Sources?

Sodnik, Jošt; Martinčič, Manica; Mikoš, Matjaž; Kryžanowski, Andrej

doi:10.1007/978-3-319-09057-3_79

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…However, sediment deposits upstream of hydraulic barriers may represent an important sediment source in the case of sediment flushing. This may cause artificial debris flow, as observed, e.g., at Slovenian mountain rivers (Sodnik et al, 2015). According to the present study, such intense sediment transport may occur when hydraulic barriers transform typically supply-limited channels into channels with locally unlimited sediment supply (Recking, 2012).…”

Section: Discussionsupporting

confidence: 57%

Analysis of mechanical-hydraulic bedload deposition control measures

et al. 2017

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Section: Discussionsupporting

confidence: 57%

Analysis of mechanical-hydraulic bedload deposition control measures

et al. 2017

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“…The geometry of the deposition area referred to the desirable optimum between sediment retention and flushing: the trapping efficiency of reservoirs (Brown, 1943), as well as the sediment flushing potential, which increases with increasing length and decreasing width of the deposition area (Zollinger, 1983(Zollinger, , 1984Piton and Recking, 2016a). The unwanted flushing of sediment traps represents a high risk at urban downstream reaches and should be avoided (Morris et al, 2008;Sodnik et al, 2015). To ensure a high trapping efficiency, but at the same time limit the risk of unwanted sediment flushing, a rectangular deposition area with a width to length ratio of 3 : 4 was used for the experiments (Zollinger, 1983).…”

Section: Premises and Descriptions Of The Deposition Area With Guidinmentioning

confidence: 99%

“…The sediment supply of mountain rivers is a substantial source for the dynamics of river ecosystems. Artificial barriers, such as dams, can affect the natural flow regime vari-ability with direct impacts on the eco-morphological state of rivers (Allan and Castillo, 2007;Sponseller et al, 2013). Maintaining the natural conditions of rivers is a multidisciplinary concern and artificial interventions require the consideration of ecological and morphological site evaluations (Bain et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Sediment traps with guiding channel and hybrid check dams improve controlled sediment retention

Schwindt

Franca

Reffo³

et al. 2018

Nat. Hazards Earth Syst. Sci.

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Abstract. Sediment traps with partially open check dams 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 degradation of downstream reaches. This study experimentally analyses a novel concept for permeable sediment traps. For ensuring the sediment transfer up to small floods, a guiding channel implemented in the deposition area of a sediment trap was systematically studied. The bankfull discharge of the guiding channel corresponds to a dominant morphological discharge. At the downstream end of the guiding channel, a permeable barrier (check dam) 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 barrier obstructs hazardous sediment transport for discharges that are higher than the bankfull discharge of the guiding channel without the risk of unwanted sediment flushing (massive self-cleaning).

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“…To intercept these hazardous phenomena, structural countermeasures are commonly installed along the predicted flow paths to dissipate the kinetic energy and retain the debris volume (Baldwin et al 1987;Hübl et al 2005;Cui et al 2018). Closed-type dam, a retention structure, is typically used to store torrent sediments and to diminish energy (Jaeggi et al 1997;Sodnik et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the regulation function of slit dam against debris flows

Zhou

Song

et al. 2018

Landslides

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Slit dams are open-type structures used to mitigate debris-flow hazards by constricting the flow and attenuating the kinetic energy. However, slit dams are often filled up as they are designed to impede debris volume instead of reducing kinetic energy of debris flows. To better understand the regulation function of slit dams against debris flows, physical model tests were carried out using a 7-m-long flume. The water content and relative post spacing were varied to discern their influence on the regulation function. Results reveal that the velocity attenuation and trapping efficiency is strongly controlled by water content and relative post spacing. Water content fundamentally reflects the degree of liquefaction (effetive grain-contact stress) and capacity of energy dissipation of debris flows. When water content < 26%, relative post spacing has a noticeable effect on velocity attenuation, trapping efficiency, and run-out distance. In contrast, when water content ≥ 26%, the influence relative post spacing is negligible. Furthermore, a new relationship between velocity attenuation and trapping efficiency for the design of slit dams is proposed to avoid the slit dam being easily filled up by sediments contained in debris flows.

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Are Torrent Check-Dams Potential Debris-Flow Sources?

Cited by 13 publications

References 6 publications

Analysis of mechanical-hydraulic bedload deposition control measures

Analysis of mechanical-hydraulic bedload deposition control measures

Sediment traps with guiding channel and hybrid check dams improve controlled sediment retention

Experimental study on the regulation function of slit dam against debris flows

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