黄河宁夏青石河段丁坝间距研究  

Study on the Spacing of Spur Dikes in Ningxia Qingtongxia-Shizuishan Section of Yellow River

作　　者：张林忠[1] 刘燕[1] 万强[1] 董其华[1] ZHANG Linzhong;LIU Yan;WAN Qiang;DONG Qihua(Key Laboratory of Yellow River Sediment of MWR,Yellow RiverInstitute of Hydraulic Research,Zhengzhou 450003,China)

机构地区：[1]黄河水利科学研究院水利部黄河泥沙重点实验室,河南郑州450003

出　　处：《人民黄河》2018年第11期49-52,共4页Yellow River

基　　金：国家自然科学基金资助项目(41501014);黄河水利科学研究院基本科研业务费专项(HKY-JBYW-2016-13)

摘　　要：通过对丁坝防护弯道的效果分析,认为丁坝间距不仅会影响坝头的局部冲刷深度,而且会影响丁坝防护弯道的效果。据此,借助模型试验及理论研究成果,分析不同工程边界条件下施工期流量、整治流量及20 a一遇设防流量下的水流流态、局部冲刷和河势演变,并从丁坝间距与丁坝所在河段的位置有关的角度出发,分析了凹岸丁坝群的丁坝间距与丁坝坝长的关系。研究表明:1.1倍坝长丁坝间距和1.5倍坝长丁坝间距对水流流态、局部冲刷和河势演变的影响差别均较小,结合理论研究认为来流方向与坝迎水面的夹角为60°～75°的坝段,丁坝间距应优先采用1.1倍坝长;来流方向与坝迎水面的夹角为20°～30°的坝段,丁坝间距宜采用2.0～2.6倍坝长。Through the analysis of the effect of protection of bend site by use of spur dikes, it was considered that the spacing of spur dikes would not only affect the local scour depth, but also affect the effect of protection of bend site by use of spur dikes. On these grounds, with the help of model test and theoretical research, we analyzed the flow pattern, local scour and river regime evolution of different boundary conditions, flow during the construction period, regulation flow and 20 year flow and from the angle of the spacing of spur dikes and the position of the groin at the river segment. It analyzed the relationship between the spacing of spur dikes and the length of spur dike and based on the theoretical study it put forward spur dike spaces. The research shows that comparison of the spacing of spur dikes by use of 1.1 times length of spur dike and the spacing of spur dikes by use of 1.5 times length of spur dike, the two make no differences on the evolution of flow pattern,local scour and river regime. Combined with theoretical analysis, it is considered that the spacing of spur dikes is 1.1 times length of spur dike in those spur dikes with the angle between the flow direction and dam surface is 60 degrees to 75 degrees; The spacing of spur dikesshould be 2.0-2.6 times length of spur dike in those spur dikes with the angle between the flow direction and the dam surface is 20-30 degrees.

关 键 词：水流流态 控导效果 丁坝间距 青石河段 黄河 

分 类 号：TV871[水利工程—水利水电工程] TV882.1