长江科学院院报Issue(4)：45-50,6.DOI:10.3969/j.issn.1001-5485.2015.04.009
壅水条件下水流阻力试验研究
Experimental Research on Flow Resistance in the Presence of Backwater
摘要
Abstract
The flow resistance and sediment transport in backwater condition is very important in hydraulic engineer-ing.Through generalized flume experiment,we measured the flow velocity using Acoustic Doppler Velocimeter (ADV)and analysed the flow resistance and bed shear stress in the presence of backwater in river channel.Result shows that in backwater condition,the velocity distribution along vertical direction is much more homogeneous than that in uniform flow condition.The coefficient for describing the non-uniform flow increases when backwater intensi-fies,but still follows the logarithmic distribution.Friction velocity decreases with the depth of water increases,and the flow resistance increases with hydraulic radius and the coefficient for describing the non-uniform flow.Finally a formula is fitted between the bed shear stress index and the backwater degree index.关键词
壅水条件/水槽试验/流速分布/水流阻力/床面切应力Key words
backwater condition/flume experiment/flow velocity distribution/flow resistance/bed shear stress分类
建筑与水利引用本文复制引用
金中武,徐军辉,吴华莉..壅水条件下水流阻力试验研究[J].长江科学院院报,2015,(4):45-50,6.基金项目
国家自然科学基金面上项目 （）
