动床水流卡门常数K的物理意义及其应用  

Physical significances and applications of karmon coefficient of flow on movable river bed

作　　者：秦荣昱[1] 王崇浩[1] 刘淑杰[1] 

机构地区：[1]中国水利水电科学研究院

出　　处：《水利学报》1995年第1期8-18,共11页Journal of Hydraulic Engineering

基　　金：水利水电科学基金

摘　　要：本文分析了动床水流流速分布与点、线、面的卡门常数Ｋ值的关系，指出在主流区流速分布仍遵循对数定律（但Ｋ值不再是０．４），文中揭示了动床水流卡门常数Ｋ值具有可变的特征，建立了悬浮指标、掺混长度、动量交换和泥沙交换系数垂线分布变化规律与水流结构（流速分布）变化规律之间的联系，并获得了正确的理论解．The relationships between velocity distribution of now on movable river bde and the barman coefficients K at a point, a vertical or a cross section are analysed inthis paper. It is found that the velocity distribution in the main flow is accord withlogarithmic law, but the value of K is always deviated from 0.4. The theoretical solutions of the relationship of the variations of the sediment suspension index., mixinglength, coefficient of momentum transfer as well as sediment transfer and the variations velocity distribution are deduced.

关 键 词：泥沙 动床水流 卡门常数 物理意义 

分 类 号：TV14[水利工程—水力学及河流动力学]