梯形断面棱柱体渠道水流流态规律研究  

Variation in flow pattem with unit width discharge in the prism canal with trapezia section

作　　者：刘曾美[1] 吴俊校[2] 

机构地区：[1]华南理工大学水利水电工程系,广东广州510640 [2]广东省水利水电建设管理中心,广东广州510600

出　　处：《水利水运工程学报》2009年第3期54-58,共5页Hydro-Science and Engineering

基　　金：广东省防洪减灾研究项目

摘　　要：从理论上分析了梯形直棱柱体渠道的临界底坡ik关于单宽流量q的函数特征,研究了水流流态随单宽流量q的变化规律,并以示例探讨.结果表明,当边坡系数m≤0.466 4时,渠道存在着最小临界底坡(ik)min,(ik)min随m的增大而减小,并且可以用渠道的实际底坡i与(ik)min相比较来分析判定渠道中水流流态随单宽流量q的变化规律;当边坡系数m>0.466 4时,临界底坡ik随单宽流量q的增大而减小,则可以通过比较实际单宽流量与临界底坡为实际底坡时对应的单宽流量的大小来判定水流流态.According to the theoretical analysis, this paper reveals the function characteristic of critical bed slope ik varying with unit width discharge q in the prism canal with trapezia section, and analyzes the variation in flow pattern with the unit width discharge. Moreover, by the case studies, the results show that the canal exists the minimum critical bed slope （ ik） min when the slope coefficient m is no more than 0. 4664, which will diminish while m increases, and the variation in flow pattern with the unit width discharge q in the canal can be ditermined by comparing the actual bed slope i with （ik） min. of the canal; When the slope coefficient m is more than 0. 4664, the critical bed slope will diminish while the unit width discharge q increases, and the variation in flow pattern can be ditermined by comparing the actual unit width discharge with the unit width discharge which is corresponding to the critical bed slop equaling the actual bed slope.

关 键 词：棱柱体渠道 梯形断面 流态 临界底坡 单宽流量 变化规律 

分 类 号：TV133[水利工程—水力学及河流动力学]