泥石流的径流量与流量分布特征

在泥石流危险度评价中，泥石流的规模和频率通常被视为最重要的两个特征因子，但在区域性的研究中，两者之间的关系并没有充分地表现出来。利用蒋家沟的大量观测数据，对流量、径流量这两个最能反映泥石流规模的参数，进行统计分析，分析流量与径流量的分布特征，从一个侧面反映泥石流规模和频率之间的关系。结果表明，尽管频率随流量和径流量规模的增大而减小，但在定量上，不同事件之间存在明显的差异，这是由泥石流的自身特征决定的，因而分布特征也反映了泥石流活动的本质。

Distribution of Discharge and Runoff of Debris Flow

Magnitude-frequency relations are of the most importance in risk assessment of debris flow. In this paper, employing numerous dataof field survey and observation, we present these relations in terms of discharge and runoff, the two representative parameters of debris flow magnitude. Observations of debris flows in Jiangjiagou allow a systematic survey of distribution of discharge and runoff. Results show that both these parameters are subject to the exponential distribution, with exponent varying with the events, which can be thought of as representing various processes of debris flow. These numerically determined relationships, although in statistic sense, might provide a quantitative reference to the assessment of debris flows.