【摘要】 应用王光谦等发展的流团模型,在泥石流摩阻为速度的二次多项式的条件下,根据一定的地形条件、流量过程线及泥石流体的一些参数,模拟了泥石流在堆积扇上的扩散堆积运动。由数值模拟结果,以泥石流的最大动能为分区指标,建立了泥石流危险度分区模型。最后将该方法应用到云南东川尼拉姑沟,取得了该沟50a一遇泥石流的泛滥范围和危险度分区。更多还原

【Abstract】 Traditional method of risk zoning applied to single gully of debris flow doesn’t base on flow depth and velocity distribution of debris flow. At the same time numerical simulation can provide these distributions in the inundation region. So it is found that the zoning method combined with numeric simulation has wider application in the risk zoning of single gully than traditional method does. Here the particle model, a versatile numerical method presented by Wang et al, has been applied to simulating the process of debris flow deposition and diffusion. Different from Wang’s model the friction slope is considered as second-order polynomial of velocity. A new index R, the kinetic energy of debris flow, was introduced to reflect the synthetic effect of velocity and flow depth on the hazard. In addition, equal-variance zoning was adapted in determining the quantitative range corresponding to different risk grade. Finally the new zoning method was implemented in the risk zoning of Nigula gully in Yunnan Province and some good results were obtained.更多还原