插板透水丁坝分流分沙影响因素数值模拟  

Numerical simulation on influence factors of flow and sediment diversion of permeable sheet piling spur dike

作　　者：毛亮 李玉建[1] 周正平 申帅辉 耿义鑫 MAO Liang;LI Yujian;ZHOU Zhengping;SHEN Shuaihui;GENG Yixin(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《人民长江》2021年第9期216-222,共7页Yangtze River

基　　金：国家自然科学基金项目(51469032)。

摘　　要：为了探究不同因素对插板透水丁坝分流分沙的作用规律,通过CCHE2D水沙模拟软件对塔里木河新其满河段河槽模型进行数值模拟,分析不同流量、粒径和坝长下插板透水丁坝周围断面总单宽流量、泥沙浓度、流速及切应力变化规律。结果表明:当其它条件一定时,来流量越大,坝前单宽流量增大,分流比增大,坝后切应力减小,主流区流速、切应力增大,有利于河道输水输沙;粒径越大,坝前比坝后单宽流量、泥沙浓度大,分流分沙比增大,起到促淤作用;坝长越长,坝前壅水面积增大,坝后流速减缓区越大,河流束窄宽度越窄,分流分沙比增大,但分沙比变化幅度大于分流比。因此,插板透水丁坝具有分流分沙作用,可稳固河岸,使河床断面水沙重新分配,达到新的平衡,起到保护河岸和调水调沙作用。In order to explore the law of flow and sediment diversion ability of permeable sheet piling spur dikes,based on the CCHE2D water and sediment simulation software,a numerical simulation of river channel model for Xinqiman reach of Tarim River was built,and then we analyzed the effects of different flow rate,particle size and length of dike on the total single-width flow,sediment concentration,velocity and shear stress of the cross section around permeable sheet piling spur dike.It is showed that when other conditions are fixed,the larger incoming water flow is,the larger total single-width flow in front of the dam is.When the diversion ratio increases,the shear stress behind the dike decreases,and the velocity and shear stress in the main channel increase,which is conducive to water and sand transportation in the river.The larger the particle size is,the larger flow rate and sediment concentration are in front of the dam than that behind the dam,which can promote deposition.When the length of the dike increases,the backwater area in front of the dam increases and the velocity in water detained area behind the dam also increases.In this condition the river width is narrowed and flow and sediment diversion ratio increase,but the variation of flow diversion ratio is greater than the sediment diversion ratio.It can be concluded that the permeable sheet piling spur dike can separate water flow and sediment and stabilize the river bank,which plays a role in protecting the shore and regulating flow and sediment.

关 键 词：插板透水丁坝 数值模拟 分流分沙 塔里木河 

分 类 号：TV863[水利工程—水利水电工程]