黄河禹潼河段控导拐头坝长度比选研究

Study on Comparison and Selection of the Length of Control Turning⁃Head Groin in Yumenkou⁃Tongguan Reach of the Yellow River

禹潼河段是黄河进入下游前最后一段宽河道段,自然滞洪沉沙作用明显。为协调河道防洪、生态环境保护、滞洪沉沙、护滩护站、控导河势等治理任务及目标,新一期河段防洪治理工程中,新建续建控导工程采用了新型控导拐头坝方案,在控导工程上首布置拐头坝,可调整坝后水流流场,预防回淤口进水导致水流抄工程后路。通过构建控导拐头坝三维模型,采用数值模拟分析、比选、论证并确定拐头坝长度,结果表明:工程长度1000 m布置500 m回淤口方案最优,拐头坝长度采用200 m。

The river section from Yumenkou to Tongguan is the last wide river section before the Yellow River enters into the lower reaches.Its natural function of flood detention and sediment deposition is obvious.In order to coordinate the tasks and objectives of flood control,eco⁃logical environment protection,flood detention and sediment deposition,beach protection,station protection and control and guide river re⁃gime,in the new stage of flood control and guide works,a new scheme of control turning⁃head groin was adopted for the new continuation of control and guide works,which was firstly used in the control and guide works.It could adjust the flow field behind the groin and prevent the water flowing into the back site.Through building a three⁃dimensional model of control turning⁃head groin and determining the length through analysis,comparison and demonstration by using numerical simulation,it shows that the scheme of 1000 m long works and the back silt out⁃let of 500 m is the best and the length of turning⁃head groin is 200 m.