根据阵流估计泥石流堆积参数

Parameter evaluation of deposition in terms of debris-flow surges

泥石流堆积是泥石流产生灾害的主要方式 ,也是进行泥石流灾害评估的主要依据。根据泥石流堆积的形态特征提出了堆积的元过程叠加 ,将堆积与间歇性的阵流运动联系起来 ;利用近 2 0年来蒋家沟泥石流阵流序列的观测数据 ,估计了堆积的相关因子 ,如速度、流深、流量、堆积厚度等。这些因子表现出一定的频率分布特征 ,它可能改变过去确定论的泥石流观念 。

Deposition, usually recognized as the very evidence and indicator of debris flow and its assessment, has long been thought of as an outcome of a certain process, having a determined set of property featuring the debris flow in question. Deposition features suggest that it is actually a result of iteration and accumulation of some elementary unit process, which is associated with the intermittent surges of debris flows. Then, from the observations of debris flow surges in the Jiangjiagou Gully, one can calculate various properties concerning debris flow and its deposition, such as the flow discharge, depositional thick, as well as viscosity and yield strength, which present certain style of curve of frequency distribution, suggesting a probabilistic viewpoint about debris flow. This understanding is seemingly about to change the traditional deterministic conceptions in assessing debris flow and the detailed distributions are ready to provide quantitative basis for practical purposes in the study of debris flows.