Landslide dams form in river channels due to heavy rains or earthquakes. The flood discharge generated by overflow erosion, a known common cause of dam bursts [Schaster et al., 1986], must be estimated promptly to establish warning and evacuation systems downstream area residents. Previous studies [Satofuka et al., 2007a ; Satofuka et al., 2007b ; Satofuka et al., 2007c ; Mizuyama et al., 2006] have shown that the “two-layer model” proposed by Takahama et al. [2000] can be used to roughly estimate the peak discharge and hydrograph of a flood caused by overflow burst from a landslide dam at a given point in the downstream area. A landslide dam was formed in the Mimi River in Miyazaki Prefecture by local downpour due to the typhoon in September 2005, which burst later because of overflow erosion. The authors used “two-layer model” to simulate the flood discharge caused by the burst and worked out an approach to simple analysis of the risk associated with landslide dams when multiple landslide dams form simultaneously.
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机译：由于暴雨或地震，河道形成了滑坡水坝。必须迅速估计由溢流侵蚀产生的洪水流量，这是大坝溃决的常见原因[Schaster et al。，1986]，以便在下游地区居民中建立预警和疏散系统。先前的研究[Satofuka et al。，2007a; Satofuka et al。，2007b; Satofuka et al。，2007c; Mizuyama等人，2006年]证明了Takahama等人提出的“两层模型”。 ［２０００］可以用来粗略估计在下游区域给定点滑坡坝溢流爆发引起的洪水的峰值流量和水位图。由于2005年9月的台风，宫崎县咪咪河在当地倾盆大雨中形成了滑坡水坝，后来由于溢流侵蚀而破裂。作者使用“两层模型”来模拟由爆裂引起的洪水排放，并提出了一种方法来简单分析同时形成多个滑坡坝时与滑坡坝相关的风险。
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