This study describes a combined method for rainfall-induced debris flow initiations (landslides) and propagations including a series of numerical analyses. In this study, the debris is assumed as a mixture of soils and water which is physically non-Newtonian fluid. The emphasis is placed on applying the effect of the combination of rainfall-induced landslides and debris flows to the numerical analysis. An analysis of rainfall-induced landslides is conducted to identify the thickness and location of the initial volume of debris flow. The movement of debris flow is subsequently simulated considering entrainments affected by the initial wetting condition (wetting front) estimated from the rainfall-infiltration analysis. The proposed method can simulate a sequential process from the initiation of the debris flows to the deposition based on the prediction of slope failure by rainfall, fluid dynamics based on Navier–Stokes equation, and the analysis of entrainments by considering the effect of the weight of debris and the wetting condition of soil beds. Based on the numerical results of this study, the proposed method could be applied to the analysis of regional-scale landslides and debris flows.

中文翻译：

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一种泥石流触发和传播的组合建模方法

本研究描述了降雨引起的泥石流起始（滑坡）和传播的组合方法，包括一系列数值分析。在这项研究中，碎片被假定为土壤和水的混合物，它是物理上的非牛顿流体。重点是将降雨诱发的滑坡和泥石流的组合效应应用到数值分析中。对降雨诱发的滑坡进行了分析，以确定初始泥石流体积的厚度和位置。随后模拟泥石流的运动，考虑到受降雨入渗分析估计的初始润湿条件（润湿前沿）影响的夹带。该方法可以基于降雨对边坡破坏的预测、基于 Navier-Stokes 方程的流体动力学以及通过考虑重力影响的夹带分析来模拟从泥石流开始到沉积的连续过程。碎屑和土床的润湿状况。基于本研究的数值结果，该方法可应用于区域尺度滑坡和泥石流的分析。