Experimental Investigation of the Failure of Cascade Landslide Dams

Cascading breaching of the Tangjiashan landslide dam and two smaller downstream landslide dams

“…The model presented by Cao et al (2011) did not consider the variation of soil erodibility in landslide dams. Niu et al (2012) argued that the cascading dam failure mode and breaching flood were largely influenced by the inflow from the upstream lake. The existing studies offered general understanding of cascading breaching of landslide dams.…”

Numerical Simulation and Risk Assessment of Cascade Reservoir Dam-Break

“…Based on the linear model and the exponential model, Chen et al [23] proposed a hyperbolic erosion model to describe the relationship between the erosion rate and the shear stress as shown in Equations (7) and (8).…”

“…This experiment indicated that the hydraulic features of dam-break water flow will be influenced by the initial water level and the distance between upstream and downstream dams. Niu et al [8] researched the cascade and single dam failure modes triggered by overtopping floods through a series of physical model experiments in a sloping flume, and they found each part of the dam's cross section broke uniformly instead of forming a breach when enlarging the inflow discharge. Cao et al [9] concluded that the dam-break flood would be influenced by the dam-to-dam distance and height difference in a cascade reservoir through the shallow water hydrodynamic model.…”

Breach mechanism and numerical modeling of barrier dam due to overtopping failure

“…由于堰塞坝沿河流运动方向的堆积体一般较长, 应重点关注溃坝过程中坝体沿河流运动方向形态的变 化, 同时研究溃口在坝顶和下游坡的发展过程. 通过一 系列堰塞坝漫顶溃坝小比尺物理模型试验 [15,18,22] 和唐 家山现场实测资料 [4,12] 均发现, 堰塞坝在溃决过程中, 水流的冲蚀作用主要表现为表层冲刷, 堰塞体在水流 作用下沿河流运动方向的坡角也逐渐减小, 这与黏性 土坝在溃坝水流作用下的"陡坎"冲蚀具有明显区别, "陡坎"冲蚀一般表现为下游坡坡角逐渐增大形成"陡 坎"并不断向上游发展 [26,27] . 以四川大学水力学与山区 河流开发保护国家重点实验室开展的堰塞坝漫顶溃坝 物理模型试验为例, 其获取的坝体纵坡面形态演化过 程如图2所示 [15] ; 另外, 图3为唐家山堰塞坝泄流前后 堰塞体形态图 [12] , 图中I~XII为断面编号.…”