Numerical and Experimental Study on Debris-Flow Deposition and Erosion Upstream of a Check Dam

Abstract

Debris flow is a phenomenon that high-density water with mud and big gravel flows down along a stream at high speed. Because of its high density and speed, it has huge destruction power. Thus damages by debris flows are very severe and sometimes tragic. A check dam is commonly used for preventing the sediment disaster due to debris flow by storing the harmful sediment discharge and has various types. Numerical simulations and experiments have been carried out to investigate the mechanism of debris-flow deposition process upstream of a check dam, and flushing out of deposited sediment due to erosion process by a normal scale flood flow. The simulations and experiments have been performed using closed type and grid type check dams. The simulated results agree well with the experimental results. From the results, it is shown that the grid type check dam can keep their sediment trapping capacity more effectively than the closed type check dam.

Formation-Evolutionary Mechanism Analysis and Impacts of Human Activities on the 20 August 2019 Clustered Debris Flows Event in Wenchuan County, Southwestern China

“…Field reconnaissance indicated that the bursting of check dams was a significant reason for the amplification of the scale of the disaster and the enhancement of the destructive power at the mouth of the gullies. Building check dams in debris-flow gullies is a common engineering measure to control hazards from debris flow (You, 2001;Shrestha et al, 2008;Yuan et al, 2018). If the check dam can withstand the impact and erosion from the debris flow, there is no doubt that building a check dam is useful in regulating the peak discharge, intercepting large boulders and falling rocks, and greatly reducing the damage from the debris flow downstream.…”

Análisis descriptivos de procesos de remoción en masa en Bogotá

“…Un ejemplo de esto es un estudio generado por Guzzetti et al (2008), que reporta el 42% de participación para los flujos de detritos del total de fenómenos de remoción de masa registrados en una base de datos global de 2626 eventos detonados por lluvia en el período comprendido entre 1917 y 2005. De igual manera el 42% de los desastres causados por movimientos en masa en Japón entre los años 1989 y 2007, son atribuidos a los flujos de detritos (Shrestha et al, 2008). Los flujos de detritos representan el 32% de 252 casos de movimientos en masa de la cuenca vertiente al embalse de Rules en la provincia de Granada, España (Jiménez-Perálvarez et al, 2010).…”

Method to evaluate large-wood behavior in terms of the convection equation associated with sediment erosion and deposition

“…Nakagawa et al (1994) proposed a numerical simulation model to compute the behavior of individual wood pieces in a two-dimensional flow field by calculating the transportation of wood using a combination of translocation and rotation. This method was applied and verified in several laboratory experiments (Shrestha et al, 2009(Shrestha et al, , 2012. Gotoh (2001) proposed a method to track the motion of driftwood based on the Lagrange particle method (MPS method) by treating wood pieces as rigid bodies.…”