水科学进展2016，Vol.27Issue(2)：266-279,14.DOI:10.14042/j.cnki.32.1309.2016.02.012
连续弯道水流模拟中二次流修正效果评价
Comparative evaluation of secondary flow correction methods for consecutive bend flow simulation
摘要
Abstract
Secondary flow has a substantial influence on water flow, mass transportation and riverbed evolution. How-ever, conventional 2-D depth-averaged models usually ignore the influence of secondary flow. Furthermore, the suita-bility of existing secondary flow correction models is debatable. To select a secondary flow correction method that can be applied to complex consecutive bends, two typical linear model calculation schemes, the Delft3D and Lien meth-ods, are evaluated. The influence of secondary flow is considered in the 2-D depth-averaged models proposed in this paper by calculating the dispersion stresses added to the 2-D shallow water momentum equations in orthogonal curvilin-ear coordinates. Four unique consecutive curved flume experiments were chosen to evaluate the simulation effects. The evaluations compared the simulated water levels and velocity distributions for a conventional 2-D model and two kinds of secondary flow correction methods. Analysis of the simulation results demonstrates that the performance of the Delft3D secondary flow correction method is the better of the two methods tested. The method has higher degrees of freedom and is suitable for different complexity levels of consecutive bend simulations. While Lien′s secondary flow correction method is not suitable for sharp consecutive bend flow simulations, it can be used effectively to simulate weak or moderate bends, however, care should be taken for consecutive bends of moderate curvature. Therefore, com-parison of the two methods shows that the Delft3D modeling method is the better choice for simulating flow in consecu-tive bends.关键词
二次流/扩散应力/连续弯道/二维模型/急弯Key words
secondary flow/dispersion stresses/consecutive bends/2-D model/sharp bends分类
建筑与水利引用本文复制引用
周刚,姚仕明,秦翠翠,贾鹏..连续弯道水流模拟中二次流修正效果评价[J].水科学进展,2016,27(2):266-279,14.基金项目
长江科学院开放研究基金资助项目（ CKWV2012303／KY）；国家自然科学基金资助项目（51109194） The study is financially supported by the CRSRI Open Research Program （ No． CKWV2012303／KY） and the National Natural Science Foundation of China （ No．51109194）． （）
