粘性泥石流复式沟床水力特性探讨  

The Hydraulic Characteristics in of Viscous Debris Compound Channels Flow

作　　者：游勇[1] 柳金峰[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176-181,共6页Mountain Research

基　　金：国家重点基础研究项目（2003CB415202）.

摘　　要：天然粘性泥石流沟床都是复式断面，不同滩槽宽度比在不同的泥位条件下其水力要素（过流面积、湿周、水力半径）有所不同。引用天然河流水力计算方法，对概化的复式沟床泥石流流量计算表明：滩槽宽度比对滩、槽过流能力及流量分配有较大的影响；同一滩槽比情况下，主槽过流与全断面过流量之比随泥深增大而逐渐减小，而滩面过流与全断面过流量之比却逐渐增大；泥石流复式沟床滩槽影响可用协同度表示，计算分析表明，滩槽比相同时，随泥深增加，滩、槽影响逐渐减小。When calculating the discharge and velocity of viscous debris flow, the roughness coefficient should be calculated first. But the channels of natural viscous debris flows are all compound. Simply using the roughness coefficient to calculate the hydraulic characteristics is defective obviously. By using the hydraulic calculating method of natural river （Pavlovskij method, Einstein method and Lotter method）, this paper discusses the hydraulic characteristics in compound channels of viscous debris flow. Through analyzing and calculating, the results are shown as follows： （ 1 ） The hydraulic characteristics aredifferent when the width ratio between the foreshore and deep channels in compound channels and the mud trace are different. （2）The width ratio has great influence on the conveyance capacity of the foreshore and deep channels and the discharge distribution. In the same width ratio, the proportion of the main deep channel＇s conveyance magnitude decreases gradually along with the increase of the mud trace, while the proportion of the foreshore＇s conveyance magnitude increases gradually. （3） When the same scale debris flows pass the channels of different width ratio, the conveyance capacity of the big width ratio in compound channels is far bigger than the small width ratio. （4）The interaction between the foreshore and the deep channels in compound channels decreases gradually along with the increase of the debris flow＇s discharge. When the same scale debris flows pass the compound channels, the interaction between the foreshore and deep channels has the same changing direction. The COH value can be used to denote the interaction between the foreshore and the deep channels in compound channels

关 键 词：粘性泥石流 复式沟床 水力特征 

分 类 号：P642.23[天文地球—工程地质学]