浙西南丘陵山区沟谷泥石流降雨特征分析

浙西南丘陵山区沟谷泥石流均为暴雨型泥石流,降水是诱发泥石流灾害的主要因素。通过对暴雨与泥石流发生的时间关系分析,认为泥石流发生主要有两种类型:一是当日降雨量直接激发泥石流,另一种是泥石流发生在有一定前期降雨的积累,并利用雨量站观测资料对这两种类型泥石流发生时的降雨特征进行了详细分析,以为泥石流灾害的防治提供依据。

Analysis on the Precipitation Characteristcs of Valley Debris Flow in Southwest Mountainous Areas of Zhejiang Province

Valley debris flows are aroused by storms in southwest mountainous areas of Zhejiang Province,and the rainfall is the major inductive factor.Based on the analysis of the spatial relationship between the storm and the occurrence of debris flow,this paper proposes that there are two types of debris flow: One type of debris flow is aroused directly by the rainfall of the day and,for the other type,its occurrence is attributed to the accumulation of antecedent effective rainfall.Through the observation data from the precipitation station,the paper makes a detailed analysis on the precipitation characteristics of the time when these two types of debris occur so as to provide the proof for the prevention and control of debris flow disasters.