不连续宽级配河床垂线流速分布试验研究  

Experimental study on vertical velocity profile of river bed surface with discontinuous wide-grading sediment

作　　者：魏丽[1,2] 卢金友[3] 徐海涛[3] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]长江水利委员会长江科学院,湖北武汉430010

出　　处：《水利水运工程学报》2012年第3期26-31,共6页Hydro-Science and Engineering

基　　金：国家自然科学基金(50879006);中国科学院知识创新工程重要方向项目群(KZCX2-YW-JS305);中国科学院成都山地灾害与环境研究所青年百人团队项目资助

摘　　要：不连续宽级配床沙在天然河道中广泛存在,作为非均匀沙的特殊类型,其床面水流特性与一般意义上的非均匀床面相比具有不同的特性.以不连续宽级配床沙为例对其床面垂线流速结构进行了试验研究,结果表明不连续宽级配近底床面垂线水流结构出现S型转折,S型位置与水流强度和床面形态有关.并提出了基于近底S型的水流垂线流速分段表示的流速公式及垂线流速S型平均转捩位置的计算公式.Discontinuous wide-grading sediment widely exists in natural rivers as a specific type of non-uniform sediment.It has different flow characteristics while comparing with traditional non-uniform sediment.The vertical velocity structures of the discontinuous wide-grading sediment bed are studied in a series of flume experiments.The experimental results show that S-type vertical velocity exists near the bed surface,and the S-shaped position is related to flow intensity and bed form.The vertical velocity formula expressed by section and based on the S-type is put forward and the S position of a vertical velocity profile is derived.The study provides a basis for the research of the flow structure of the discontinuous wide-grading sediment.

关 键 词：不连续宽级配床面 垂线流速 S型流速 

分 类 号：TV142.1[水利工程—水力学及河流动力学]