北京王虎沟泥石流堆积物粒度参数分析

Granularity parameter of debris flow deposit in Wanghugou Gully,Beijing City

通过野外实地调查与室内实验相结合的方法,对王虎沟泥石流堆积物的粒度组成进行研究分析,采用平均粒径、分选系数、偏度、峰度等粒度参数分析了北京王虎沟堆积物特征。研究表明:颗粒平均粒径在上、中和下游表现为大—小—大,整个流域颗粒的分选均较差,上游和中游堆积区颗粒粒径偏度比下游更趋于对称;上中下游峰度值表现为大—小—大。通过对当地泥石流堆积物颗粒参数的分析,得出:此流域如遇暴雨极易发生泥石流灾害,会对当地人民群众的生产生活带来重要影响。

Based on field investigation and laboratory experiment,using average radius,sorting coefficient,tolerance,peak etc.,partical size of Wanghugou debris flow were analyzed.Results show that the mean grain diameter in up,middle and down streams changed from large to small and then to large.The particles in whole gully had poor sorting property.In up and down stream,the skewness of the particle size tends to be more symmetrical than in middle stream.The peak values of up,middle,and down stream changed from large to small and to large again.It can be concluded if this area encounters heavy rain fall,debris flow would highly likely to happen,which will bring huge impact on daily work and life of local people.