水科学进展2017，Vol.28Issue(4)：564-570,7.DOI:10.14042/j.cnki.32.1309.2017.04.010
急缓流态交替的陡坡河道水动力模型
Hydrodynamic model for steep river with transitionon supercritical and subcritical flow
摘要
Abstract
In order to address the issue of unstable numerical solution due to transition between supercritical and subcritical flows in local region in river-network modeling, the real flow status were firstly divided into four types including subcritical flow, supercritical flow, trans-critical flow, and shock, and then an adaptable model was introduced by increasing internal boundaries according to water balance and characteristics theory in the traditional Preissmann model.The final developed model preserves the advantages of the Preissmann model, which only need two points for each numerical template and can be easily integrated with mature river-network model.Numerical results for classic cases show that the introduced model is able to deal with gradual transition between subcritical flow and supercritical flow.A case study in Shiting river shows that the introduced model can converge to constant flow state using both single-river or river-network pattern, when frequent transition on supercritical and subcritical flow appears;this indicates the model can keep stable during complex flow modeling.关键词
水动力学/数值方法/跨临界流/河网模型/陡峭河道Key words
hydrodynamics/numerical methods/trans-critical flow/river-network model/steep river分类
建筑与水利引用本文复制引用
吴晓玲,向小华,牛帅,王船海..急缓流态交替的陡坡河道水动力模型[J].水科学进展,2017,28(4):564-570,7.基金项目
国家重点研发计划资助项目(2016YFA0601000) （2016YFA0601000）
中央高校基本科研业务费专项资金资助项目(2015B20314)The study is financially supported by the National Key R&D Program of China (No.2016YFA0601000) and the Fundamental Research Funds for the Central Universities (No.2015B20314). （2015B20314）
