丁坝周围水流紊动特性与地形冲刷的关系  

Relationship between terrain erosion and flow turbulence characteristics around spur dike

作　　者：苏伟[1] 王平义[2] 胡宝月[1] 

机构地区：[1]河北农业大学,河北保定071001 [2]重庆交通大学,重庆400074

出　　处：《水运工程》2016年第4期129-135,共7页Port & Waterway Engineering

基　　金：河北省高等学校科学技术研究项目(Z2015158)

摘　　要：通过动床冲刷试验对不同形式丁坝的水流紊动特性进行对比分析,结合河床冲刷地形等值线图,找出水流紊动特性与河床冲刷之间的关系。在此基础上,深入分析不同形式丁坝对水流紊动特性的影响,优选出新型坝体结构形式。试验结果表明:丁坝周围地形的冲刷与水流紊动的强烈程度有关,冲刷坑的深度随水流紊动特性的变化有先增大后减小的趋势;沙垄主要由粗砂组成,且断面形状呈"流线型",回流区出现细砂覆盖层;圆弧断面和勾头形式丁坝在减弱水流紊动方面具有一定的优势。Based on the comparative analysis of dynamic characteristics of different types of spur dikes through moving bed scouting experiment, and combining with the riverbed scouting terrain contours, we find the relationship between the turbulence characteristics and bed scour. On this basis, we carry out an in-depth analysis of the impact of different types of dikes on the dynamic characteristics of turbulent flow, and optimize the structure of the new-type dam. Test results show that the erosion of terrain around the spur dike is associated with the intensity of turbulence flow, the depth of the scour pit increases first and decreases later along with the change of flow turbulence characteristics; the sand ridge is mainly composed of coarse sand, and the cross section is in the ＂streamlined＂ shape, the backflow zone appears fine sand layer, and the circular cross section and hook type of spur dike has a certain advantage in less flow turbulence.

关 键 词：丁坝 紊动特性 地形 关系 

分 类 号：U671.91[交通运输工程—船舶及航道工程]