长江上游分汊河段不同深度水流的紊动特性研究  

Turbulent characteristics of water flow at different depths in upper branch of the Yangtze River

作　　者：张皓锋 赵聪聪 王平义[1] 田野[1] ZHANG Haofeng;ZHAO Congcong;WANG Pingyi;TIAN Ye(Chongqing Jiaotong University,National Engineering Technology Research Center for Inland Waterway Regulation,Chongqing 400074,China;JSTI Group,Nanjing 210017,China)

机构地区：[1]重庆交通大学,国家内河航道整治工程技术研究中心,重庆400074 [2]苏交科集团股份有限公司,江苏南京210017

出　　处：《水运工程》2024年第2期131-138,共8页Port & Waterway Engineering

摘　　要：分汊河段水流的紊动特性对河床冲淤变化和鱼类生境有重要影响,而关于分汊河段水流紊动特性的水平分布的研究较少。为了厘清分汊河段水流的紊动特性,以长江上游部分河段为原型,开展概化模型试验,并对不同深度水流的3个方向(纵向、横向和垂向)的时均流速、紊动强度及紊动能的水平分布特征进行研究。结果表明:分汊水流在分流和汇流区域有低流速区,该区域的水流紊动较强。不同深度水流的紊动强弱与滩体水平剖面面积呈正相关关系,与河床的距离呈负相关关系;近底水流的强紊动区域较为分散;上层水流的强紊动区域较为集中。The turbulent characteristics of the water flow in branch reach has an important influence on the change of the riverbed and the fish habitat,and the existing research on the turbulent characteristics of the horizontal distribution of the water flow in the branch reach is lacking.In order to clarify the turbulent characteristics of water flow in the branch reaches,we take the prototype of the upper reaches of the Yangtze River,carry out the generalized model test,and study distribution characteristics of three directions(longitudinal,transverse and vertical)time average velocity,turbulent strength and turbulent kinetic energy of water flow at different depths.The results show that there are low flow rates in the diversion and confluence area,where the water flow is strong.The turbulent strength of the flow at different depths is positively correlated with the horizontal section area of the beach body and negatively correlated with the distance from the riverbed.The strong turbulent area of the near bottom flow is dispersed.The strong turbulent area of the upper flow is concentrated.

关 键 词：分汊河段 时均流速 紊动强度 紊动能 

分 类 号：U612[交通运输工程—船舶及航道工程]