Debris Flow Simulations Due to Landslide Dam Outburst and Considering Effective Countermeasures
Debris Flow Simulations Due to Landslide Dam Outburst and Considering Effective Countermeasures
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DOI：
10.1007/978-3-030-60706-7_21
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
K. Nakatani;K. Kosugi;Y. Satofuka
中科院分区：
文献类型：
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作者：
K. Nakatani;K. Kosugi;Y. Satofuka
最近，由于暴雨事件，深层山体滑坡变得更加频繁。由于深水地貌的影响，在山区出现了一些滑坡筑坝的情况。当滑坡溃决时，大规模泥石流可能会对下游地区造成破坏。因此，对滑坡暴发引发的泥石流情景进行研究，以预测和预防下游地区的破坏。在本研究中，我们应用Hyper Kanako系统和数字高程模型DEM，在滑坡坝形成前后进行模拟。首先，通过与下游淤积的比较，模拟了滑坡溃决的情景。当泥沙直径和流体相密度分别设置为0.2微米和1000微克/立方米时，结果令人满意。然后，我们考虑了在激流中设置一个有效高度为15米的封闭式萨博大坝的有效对策设置。我们发现，将萨博大坝设置在激流下游一侧，阻止了泥沙向下游移动，有效地防止了破坏。因此，数值模拟对于滑坡坝溃决危险性图的绘制和有效的对策实施具有重要意义。
Recently, deep-seated landslides, DSLs, have become more frequent due to heavy rain events. Due to DSLs, there have been some cases of landslide dam formations in mountainous regions. When landslide dam outburst occurs, large scale debris flow might devastate the downstream area. Therefore, debris flow scenarios, arising from landslide outbursts, are studied to predict and prevent the damages in the downstream regions. In this study for the purpose of simulation, we applied the Hyper KANAKO system with the digital elevation model, DEM, taken before and after the landslide dam formation. First, we simulated the landslide dam outburst scenario by comparing it with the downstream deposition. When the sediment diameter and the fluid phase density were set to 0.2 m and 1,000 kg/m3, respectively, the results were satisfactory. Then, we considered an effective countermeasure installation in the torrent by setting one closed type sabo dam with an effective height of 15 m. We found that setting the sabo dam in the downstream side of the torrent prevented the sediments from moving downstream; this setup effectively prevented the damage. Therefore, simulations are useful for landslide dam outburst hazard mapping and for effective countermeasure implementation.