非淹没丁坝端坡对附近水流结构的调整作用  

Impacts of head slope of non-submerged spur dike on flow structure

作　　者：于守兵[1] 陈志昌[2] 韩玉芳[2] 

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 [2]南京水利科学研究院,江苏南京210029

出　　处：《水利水运工程学报》2012年第3期44-49,共6页Hydro-Science and Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金(HKY-JBYW-2010-14);水利部公益性行业科研专项经费项目(201102008)

摘　　要：为了研究非淹没丁坝端坡对水流结构的调整作用,采用水槽试验和三维浅水模型相结合的方法,比较丁坝阻水面积相等条件下端坡系数分别为0,3,5和7时丁坝附近的表层平面流场、底层平面流速分布和底层切应力分布情况.结果表明:(1)端坡系数的增加使得丁坝下游表层相对回流长度和相对回流宽度减小;(2)端坡的存在能够显著减小底层平面强相对流速范围和强相对切应力范围,且端坡系数越大效果越明显.In order to study some impacts of non-submerged spur dike head slope on flow structure,flume tests and 3-D shallow numerical model are used together to study free surface plane flow field,distributions of flow velocity and shear stress over flume bottom near non-submerged spur dikes with head slope coefficients m,0,3,5,and 7 respectively,in the condition of equal flow-blocking area.The following conclusions are drawn：（1） relative length and width of recirculation zone decrease with the increase of the head slope coofficients m;（2） the existence of head slope is able to significantly decrease bottom plane great relative velocity zone and bottom relative shear stress zone,and the bigger the value,the greater the effect.

关 键 词：非淹没 丁坝 端坡 水流结构 

分 类 号：TV863[水利工程—水利水电工程] TV131.4