Flood hydraulics due to cascade landslide dam failure
Flood hydraulics due to cascade landslide dam failure
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DOI：
10.1111/j.1753-318x.2011.01098.x
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发表时间：
2011-06
影响因子：
4.1
通讯作者：
Z. Cao;Z. Yue;G. Pender
中科院分区：
文献类型：
--
作者：
Z. Cao;Z. Yue;G. Pender
滑坡坝通常是松散的，当它们用来蓄水时，它们会发生故障，引发下游的灾难性洪水。然而，由于滑坡溃坝洪水水力学仍然知之甚少，目前无法可靠地预测。不可避免的是，这不利于容易发生山体滑坡的地区进行有效的洪水风险管理。扩展最近的调查，一个单一的滑坡溃坝和由此产生的洪水，在这里，我们提出了一个实验和计算研究的洪水流量级联滑坡溃坝。在80m × 1.2m × 0.8m的水槽中，进行了不同来流流量和坝体组成的12轮试验。部署了12个自动水位探头阵列，以测量沿着水槽的水位过程线。耦合浅水水动力学模型校准的情况下，一个单一的滑坡溃坝表现出相当不错的级联滑坡溃坝。最值得注意的是，在适当的条件下，发生顺流逐步增强的洪水引起的级联滑坡溃坝。这意味着下游洪水泛滥的风险更高，因此在洪水风险管理中需要仔细考虑。
Landslide dams are usually unconsolidated and when they act to impound water, they are subjected to failure that triggers catastrophic flooding downstream. However, the flood hydraulics due to landslide dam failure has remained poorly understood and cannot be reliably predicted at present. Inevitably, this militates against effective flood risk management in areas prone to landslides. Extending the recent investigation of a single landslide dam failure and the resulting flood, here, we present an experimental and computational study on the flood flow induced by cascade landslide dam failure. A total of 12 runs of experiments are conducted in a flume of 80 m × 1.2 m × 0.8 m, with differing inflow discharge and dam composition. An array of 12 automatic water‐level probes is deployed to measure the stage hydrographs along the flume. The coupled shallow water hydrodynamic model calibrated for cases of a single landslide dam failure is demonstrated to perform reasonably well for cascade landslide dam failure. Most notably, under appropriate conditions, the occurrence of streamwise progressive enhancement of the flood induced by cascade landslide dam failure is demonstrated. This features a higher risk of flooding downstream and therefore warrants careful consideration in flood risk management.