摘要
为了分析常州城市河道淤积的机制,采用了量纲分析和水槽实验的方法,研究支流河道汇入主流河道过程中,主河道岸坡角、支流与主流的流量比、密度弗劳德数对汇流区冲刷的影响。研究将支流水槽与主流水槽的汇流角定为90°,采用不同的流量比和密度弗劳德数对四种不同岸坡角(45°、60°、75°、90°)进行对比实验。结果表明:支流河道中的流量与主流河道的流量比值越小时,岸坡角对冲刷深度的影响越大;对于任何给定的密度弗劳德数,越小的岸坡角可导致越小冲刷深度。依据拟合得到的两个经验关系式,岸坡角对泥沙淤积高度的影响大于对冲刷深度的影响;密度弗劳德数对无量纲冲刷深度影响最大,岸坡角对无量纲淤积高度的影响最大。
In order to analyze the mechanism of the siltation of urban river in Changzhou,this paper uses the method of dimensional analysis and water channel experiment to study the influence of bank slope angle,flow ratio and density Froude number on the scour of the confluence area during the process of tributary river flowing into the mainstream river. In this study,the confluence angle of tributary flume and mainstream flume is set at 90°,and four different bank slope angles(45°,60°,75°,90°)are compared with different flow ratios and density Froude numbers. The results show that the smaller the ratio of flow in tributary to the flow of the main stream,the greater the influence of the bank slope angle on scour depth is. For any given density Froude number,the smaller bank slope angle can lead to the smaller scour depth.According to the two empirical relations obtained by fitting,the influence of the bank slope angle on the height of sediment deposition is more than that on the scour depth,and the density Froude number has the greatest influence on dimensionless scour depth,and the bank slope angle has the greatest influence on the dimensionless sedimentation height.
作者
付梁其
李勋章
何晓静
胡腾腾
潘磊
刘飞诗
FU Liang-qi;LI Xun-zhang;HE Xiao-jing;HU Teng-teng;PAN Lei;LIU Fei-shi(Jintan District Water Conservancy Planning Service Center in Changzhou City,Changzhou 213200,Jiangsu Province,China;Water Resources Management Service Center of Jintan District of Changzhou City,Changzhou 213200,Jiangsu Province,China;Jiangsu Province Hydrology and Water Resources Investigation Bureau(Changzhou Sub-bureau),Changzhou 213100,Jiangsu Province,China;Changzhou Jintan District Water Conservancy Construction Management Office,Changzhou 213200,Jiangsu Province,China;Jiangsu Yuanhan architectural Design Co.,Ltd.,Changzhou 213000,Jiangsu Province,China)
出处
《中国农村水利水电》
北大核心
2022年第1期28-31,38,共5页
China Rural Water and Hydropower
基金
水利部水科学与水工程重点实验室开放研究基金项目(YK914012)
水利部公益性行业科研专项经费项目(201401083-2)。
关键词
支流
岸坡
密度弗劳德数
冲刷深度
淤积高度
tributary
bank slope
density Froude number
scour depth
siltation height