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首页> 外文期刊>International Journal of Erosion Control Engineering >Runout Characteristics and Grain Size Distribution of Large-scale Debris Flows Triggered by Deep Catastrophic Landslides
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Runout Characteristics and Grain Size Distribution of Large-scale Debris Flows Triggered by Deep Catastrophic Landslides

机译：深部巨灾滑坡触发大规模泥石流的径流特征和粒度分布

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摘要

Deep catastrophic landslides (DCLs) sometimes lead to large-scale debris flows with serious impacts on human life and infrastructure. However, no adequate information about DCL-triggered debris flows, such as the topography of eroded and deposited areas or the grain size distribution, exist. We compiled published data and obtained additional new data for the topographic characteristics and grain size distributions of 10 recent DCL-triggered debris flows in Japan. We compared these data with previously published data of small-scale debris flows, steep-slope failures, and large-scale debris flows. We examined the effects of topography and DCL volume on erosion and deposition due to debris flow as well as on grain size distribution. The longitudinal gradient of the lower end of the deposited area decreased with increasing landslide volume, and about half of DCL-triggered debris flows deposited material where the longitudinal gradient of the lower end of the deposited area was less than 2°. However, the minimum longitudinal gradient of the eroded section due to debris flow was not affected by the landslide or the debris flow volume. We found that the travel distance of debris flow, including DCL-triggered debris flow, might also be a function of landslide and/or debris flow volume and that the grain size of debris flows triggered by DCLs spanned more than eight orders of magnitude.
机译：深层灾难性滑坡（DCL）有时会导致大规模泥石流，对人类生活和基础设施造成严重影响。但是，没有有关DCL触发的泥石流的充分信息，例如侵蚀和沉积区域的地形或晶粒尺寸分布。我们汇总了已发布的数据，并获得了有关日本最近10条DCL触发泥石流的地形特征和粒度分布的其他新数据。我们将这些数据与先前发布的小规模泥石流，陡坡破坏和大规模泥石流的数据进行了比较。我们检查了地形和DCL体积对泥石流造成的侵蚀和沉积以及晶粒尺寸分布的影响。随着滑坡体积的增加，沉积区域下端的纵向梯度减小，DCL触发的碎屑约有一半流过沉积物质，而沉积区域下端的纵向梯度小于2°。但是，由于泥石流造成的侵蚀区域的最小纵向坡度不受滑坡或泥石流体积的影响。我们发现泥石流（包括DCL触发的泥石流）的行进距离也可能是滑坡和/或泥石流体积的函数，并且由DCL触发的泥石流的粒度超过了八个数量级。

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