分汊型河道潜洲阻力特性的试验研究  

Test and Study on Characteristic of Resistance of Submerged Sandbars of a Braided Channel

作　　者：冯娟[1] 杨涛[1] 黄尔[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《人民黄河》2009年第8期33-34,共2页Yellow River

基　　金：国家自然科学基金重点项目(50739002);国家自然科学基金资助项目(50709021)

摘　　要：利用含潜洲结构的分汊河道模型,对潜洲阻力特性进行了试验研究。结果表明:①对于断面形状固定的河道,其糙率系数并不为常数,而是随均匀流水深、流量、断面平均流速以及雷诺数等水力要素的变化而变化;②对于不同床面布置的河道,其糙率系数也不为常数,而是随床面布置的变化而改变。The paper tests and studies the characteristic of resistance of submerged sandbars by using a braided channel model with submerged sandbar structure.The outcomes show that a) the roughness coefficient of monumented cross-section shape is not a constant,it varies with the variation of hydraulic elements of water depth and discharge of uniform flow,mean velocity of cross-section and Reynolds number and;b) the roughness coefficient of the channel with different bed layout is also not a constant,it varies with the variation of channel bed.

关 键 词：模型试验 糙率系数 阻力特性 潜洲 分汊型河道 

分 类 号：TV143[水利工程—水力学及河流动力学]