颗粒组成的整体性与泥石流冲淤的平衡  

Integrity of Grain Composition and Dynamical Equilibrium of Debris Flow

作　　者：李泳[1] 刘晶晶[1] 陈晓清[1] 韦方强[1] 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所,四川成都610041

出　　处：《山地学报》2006年第B10期222-227,共6页Mountain Research

基　　金：国家自然科学基金项目（No.40501008和No.40101001）;中国科学院知识创新项目（KZCX3-SW-352）.

摘　　要：宽粒径范围的颗粒组成是泥石流的物质特性。以西藏泥石流样本的颗粒分布曲线为例，结合蒋家沟的泥石流现象，说明了粘性（高密度）泥石流的颗粒分布曲线在总体上具有指数曲线形式，且指数范围反映了显著的区域性差异。根据颗粒分布的整体曲线，讨论了泥石流的冲淤平衡，说明颗粒特征对泥石流与沟床的相互作用和沟床的临界特征，也起着重要作用。Debris flow consists of grains of size ranging from 10^-6m - 1 m. Distribution of grain composition hasbeen discussed in detailsfor debris flows in Tibet, i. e. , the Lulang River and the Midui Gully. The cumulativecurves have been found to be fitted well by exponential functions with exponents varying with regions and gullies. In particular, it falls in the domain （0.30, 0.60） for the case of Tibet, in contrast with the domain （0.16, 0.20） of Jiangjia Gully. At last, grain composition is related to bed sediment composition of channel and a dynamical equilibrium is found to be achieved through an exponential relation between grain composition and nondimensional shear stress.

关 键 词：粘性泥石流 颗粒分布 分形 

分 类 号：P642.23[天文地球—工程地质学]