【摘要】 泥石流是一种介于崩塌滑坡和洪水之间的物理过程,既有土体的结构性,又有水体的流动性。随着泥石流运动控制方程和数值模拟技术的发展,基于数值模拟的泥石流危险性分区方法成为泥石流危险性分区的主要方法。本文应用Massflow模型,基于深度平均的连续介质力学方法,从Navier-Stokes方程出发,推导出二维运动堆积控制方程,采用MacCormack-TVD有限差分算法计算,根据古交官长沟的地形条件、水文条件、物源条件模拟了泥石流运动的全过程,计算得出泥石流泛滥范围内的流深和流速。并根据数值模拟结果和最大动能分区模型,获取该流域的泛滥范围并确定危险性分区,将模拟区划分为四个区域,即高危险区、中危险区、低危险区和安全区。泥石流的分区模型是每个网格上泥石流体的最大动能,能够直接反应泥石流对建筑物的破坏能力,分区模型具有直接的物理意义。更多还原

【Abstract】 Debris flow is a kind of physical process between landslides and floods. Both the structure of the soil, but also the flow of water. With the development of debris flow motion control equations and numerical simulation techniques. The method of risk division of debris flow based on numerical simulation is the main method of debris flow risk zoning. In this paper, Continuum mechanics method based on depth average,starting from the Navier-Stokes equation,derived two-dimensional motion control equation of accumulation,MacCormack-TVD finite difference algorithm is used to calculated.Massflow model is used to simulate the whole process of debris flow movement according to the terrain conditions, hydrological conditions and provenance conditions of Guangou Gully in Gujiao City,calculation of debris flow inundation in the range of flow depth and velocity. And according to the results of numerical simulation and the maximum kinetic energy partition model. Obtain the flood range of the watershed and determine the risk zoning.The simulation area is divided into four zones,that is, high risk area, middle danger area, low danger area and safe area.The partition model of debris flow is the maximum kinetic energy of debris flow on each grid.It can directly reflect the damage of debris flow to buildings,so the partition model has direct physical meaning.更多还原