水力插板透水丁坝坝头冲刷坑深度模型试验

为探索水力插板透水丁坝减小坝头冲刷坑深度的最佳设计参数和布置方案,通过改变流量、丁坝挑角、丁坝透水率、丁坝长度进行单因素影响试验,得出坝头冲刷坑深度与各单因素的回归方程。从每组单因素试验结果中选择最佳试验水平,利用L9(34)正交试验设计表设计4因素3水平的正交试验。试验结果表明:4个单因素对水力插板透水丁坝坝头冲刷坑深度的影响从大到小依次为:丁坝透水率、流量、丁坝长度、丁坝挑角;在一定流量条件下,水力插板透水丁坝最佳布置方案的设计参数为丁坝透水率30%、丁坝长度30 cm、丁坝挑角60°。

Model test of scour depth at jetty head of hydraulic flashboard permeable spur dike

In order to explore the optimal design parameter and layout scheme of a hydraulic flashboard permeable spur dike with the minimum scour depth at the jetty head, single factor experiments were carried out by changing the discharge, the jet angle, the water permeable rate, and the length of the spur dike. The regression equations between each single factor and the scour depth at the jetty head were obtained. The best test level in each group of single factor test results was chosen and an orthogonal experiment with four factors and three levels was designed using the L9(34)orthogonal experiment design table. The experimental results show that the four single factors influence the scour depth at the jetty head of the hydraulic flashboard permeable spur dike in the following descending order: the water permeable rate of the spur dike, the discharge, the length of the spur dike, and the jet angle of the spur dike. With a certain discharge, the design parameters of the optimal layout scheme of a hydraulic flashboard permeable spur dike are as follows: the water permeable rate of the spur dike is 30%, the length of the spur dike is 30 cm, and the jet angle of the spur dike is 60°.