感潮河段洪潮耦合双驱动力水动力模型

Dual driving force hydrodynamic model for tidal rivers with combination of flood and tide

分析了感潮河段水流运动特点和感潮河段上下边界水力作用要素差异,在完整感潮河段概念和完整感潮河段上下边界的特殊水流边界条件下,把水流水力要素分离为洪水要素和潮水要素,提出洪水水流要素和潮水水流要素耦合模拟的双驱动力水动力模型,利用长江河口感潮河段实际水流过程进行了模拟检验,获得了比圣维南方程组更合理、模拟效果更好的结果,并指出了进一步需要重点研究的问题。

flow in tidal rivers is complicated, which was contributed by the interaction of flood moving and tide periodically propagating upstream or downstream. According to the flow characteristics in tidal rivers, the flow concept of whole tidal reach was proposed. Based on the assumption that flow in a whole tidal reach can be separated into flood element and tide element, flood routing equations forced by tidal flow and tide propagation equations affected by flood were developed. And a 1-dimensional （l-D） hydrodynamic model with combination of flood and tide flow in tidal rivers （the FTM model） was established. The simulation results in the tidal reach of the Changjiang River downstream show that the proposed FTM model performs better than the 1-D Saint-Venant hydrodynamic model （the SVN model）. In addition, some key problems of further study were given.