长江科学院院报2018，Vol.35Issue(6)：60-66,7.DOI:10.11988/ckyyb.20161305
非淹没复式断面丁坝区的流速分布规律
Flow Velocity Distribution Around Non-submerged Spur Dike with Compound Section
摘要
Abstract
Spur dike with compound section is a common structure used in waterway regulation.In this paper,the law of velocity distribution around non-submerged spur dike with compound section is researched via flume experi-ment,and the results manifest that:I)In surface layer,large resultant velocity appears outside the downstream of the first-stage spur dike head;the length (b2)of the second-stage spur has noticeable impact on the value and mor-phological distribution of the zone of large resultant velocity whereas Froude number (Fr)only affects the value of velocity;transverse surface velocity distributes in an approximated fan shape,with the maximum value up to 0.45 times of test velocity.(Ⅱ)In cross-sectional scale,large longitudinal velocity is located in the adjacent of the head of the first-stage spur dike,and intense transverse velocity zone is in the front of the second-stage spur dike,both distributing in a band shape;with the increase of b2,the band width declines,and the distribution is more concen-trated.(Ⅲ)In longitudinal profile,the maximum longitudinal velocity is found in the downstream of the spur dike near water surface,and its position moves up along with the increase of b2;while the transverse velocity increases first and then decreases,with its maximum value arising close to the bottom;intense high transverse velocity zone stretches in a maple leaf shape.The research results provide reference for waterway regulation and spur dike protec-tion.关键词
非淹没丁坝/复式断面/纵向流速/横向流速/分布规律Key words
non-submerged spur dike/compound section/longitudinal velocity/transverse velocity/distribution law分类
交通工程引用本文复制引用
钟亮,王振志,王舒,周鑫靖..非淹没复式断面丁坝区的流速分布规律[J].长江科学院院报,2018,35(6):60-66,7.基金项目
重庆市基础科学与前沿技术研究项目(CSTC2017jcyjAX0278) （CSTC2017jcyjAX0278）
国家自然科学基金项目(51509026) （51509026）
