摘要
为了研究丁坝群对河流系统的作用,通过对不同间距下非淹没双体丁坝流场的比较分析,提出基于大尺度涡不相重叠、基于双丁坝断面流速分布相似和基于下游丁坝断面流速分布恢复的3种非淹没双体丁坝作用尺度划分准则,并对3种准则的优缺点及适用范围进行分析.在此基础上,分别运用3种划分准则对同一工况下非淹没双体丁坝的间距阈值进行计算,计算结果与恢复段长度的经验值进行对比,结果表明基于双丁坝断面流速分布相似和基于下游丁坝断面流速分布恢复准则的计算结果相近且均在经验范围之内,基于大尺度涡不相重叠准则的计算结果偏小,但计算简单,可结合丁坝回流区长度计算公式用于对丁坝群作用尺度进行初步估算.
In order to investigate the impact of spur dike group acting on river system, three classification criteria of impact scale of non-submerged double spur dikes were presented according to the comparison of non-submerged double spur dikes＇ flow field under different dike spacing, which were respectively based on large-scale vortexes nonoverlapping, the cross-section velocity of double spur dikes similarly distributing and the cross-section velocity of downstream dike recovering. Meanwhile, their advantages, disadvantages and application scopes were analyzed. On this basis, three criteria were applied to calculate the threshold of dike spacing under a same condition. The comparison between the calculation results and empirical value of the length of recovery segment shows that the calculation values based on the cross- section velocity of double spur dikes similarly distributing and the cross-section velocity of downstream dike recovering are similar and both in the empirical range, while the value based on large-scale vortexes nonoverlapping is smaller than empirical value but simple to calculate, and it can be used to preliminarily estimate the impact scale of spur dikes through combining with the length formula of spur dike back-flow zone.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2015年第2期200-207,共8页
Journal of Zhejiang University：Engineering Science
基金
长江科学院开放研究基金资助项目(CKWV2012322/KY)
国家自然科学基金资助项目(50909085)
浙江省水利厅科技计划项目(RC1106)
金华市科学技术研究计划项目(2012-3-003
2013-3-027)
关键词
丁坝
作用尺度
恢复区
数值模拟
河流系统
spur dike
impact scale
recovery zone
numerical simulation
river system
