糙率对截流难度的影响  

Influence of Roughness on the Difficulties of River Closure

作　　者：周玉香[1] 赵新来[1] 季新民[2] 

机构地区：[1]山东大学土建与水利学院,山东济南250061 [2]山东省水利厅,250014

出　　处：《中国农村水利水电》2003年第12期71-72,共2页China Rural Water and Hydropower

摘　　要：在截流工程中 ,加糙可以使河床底流速降低 ,其降低幅度与河床相对粗糙度有关 ,河床相对粗糙度越大 ,河床底流速降低值越大 ,反之 ,则降低值减小 ;底流速的降低 ,可以有效地减小舌状堆积体长度 ,减少抛投料和缩短截流时间 。In the process of river closure, increase of roughness of riverbed can reduce the flow speed of under-set. The range of reduce is related to the relative roughness of riverbed: The greater the roughness, the greater the range of flow speed decrease is; whereas the smaller the roughness, the smaller the range of the flow speed decrease is. Moreover, decrease of under-set flow speed can reduce the length of the tongue-shapeed deposit, lessen the volume of cast, and decrease the difficulties of river closure.

关 键 词：河床糙率 相对粗糙度 截流工程 水面线 截流流量 

分 类 号：TV855[水利工程—水利水电工程]