丁坝在山区河道截流中的效用研究  

Research on the Utility of the Spur Dike in Mountain River Closure

作　　者：张永清[1] 马旭东[1] 杨庆[1] 戴光清[1] 张静[1] 

机构地区：[1]水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《中国农村水利水电》2014年第4期132-136,共5页China Rural Water and Hydropower

摘　　要：在山区河道截流初期,由于河道坡降较大,进占戗堤难以使戗堤上游水流回壅,致使分流建筑物初期分流比较小,截流龙口始终处于高流速区段,戗堤进占困难。依托某水电站工程截流模型试验,主要研究采用分流丁坝增大截流初期分流比的作用,以及不同丁坝长度对分流建筑物分流能力和龙口水力学指标的影响。试验研究表明,分流丁坝对降低山区河道初期截流难度作用明显,同时可以在截流中后期一定程度上减小截流落差和单宽功率。Because of the large river gradient,upstream flow back is difficult with closure dike advancing.As a result,that diversion ratio of diversion structure is small at the initial stage.The closure gap is always in a high speed flow section,and closure dike advancing is difficult.By means of a hydropower project closure model test,our research is focused on the role of diversion spur dike that increases the initial stage diversion ratio,and the influence of different length spur dikes.The experimental study indicates that the diversion spur dike can reduce early river closure difficulty effectively.Meanwhile,it can also decrease the closure drop and the width of power per unit to a certain extent at the middle and later period of closure.

关 键 词：山区河道 截流 分流丁坝 模型试验 

分 类 号：TV551.2[水利工程—水利水电工程]