一、前言 降雨;是泥石流发生的充要条件,在一定的地面条件下当降雨量达到某一限值后就有可能发生泥石流,泥石流的、规模危害程度,雨量在很大程度上是决定性因素。因此在泥石流的预测报警,灾害预防等研究工作中,都十分重视雨量的研究,导至泥石流发生的因素甚多。它不仅受自然环境,地形条件的影响、而且也受地理位置和物质组成的物理,化学性质 I. Introduction Precipitation is a necessary and sufficient condition for the occurrence of debris flow. Under some ground conditions, when the rainfall reaches a certain limit, debris flow, debris flow and scale damage may occur, and the rainfall is largely determined . Therefore, in landslide forecasting alarm, disaster prevention and other research work, all attach great importance to the study of rainfall, leading to a large number of debris flow occurred. It is not only affected by the natural environment, terrain conditions, but also by the geographical location and composition of the physical and chemical properties