黄河下游典型河段滩槽分界二维洪水数值模拟

采用平面二维水沙数学模型，在黄河下游河道现存生产堤条件下，针对典型洪水进行洪水模拟计算研究。通过对黄河下游典型河段的洪水数值模拟，分析研究该区域洪水演进、漫滩及河势变化状况、滩槽流速分布及单宽流量分布，给出滩槽分流比及滩区不同程度的淹没范围。这一研究对于明确滩槽范围、为滩区受洪水灾害补偿提供明确范围、为滩区发展创造良好环境及维持黄河健康生命具有非常重要的意义。

2-D numerical simulation on delimitation between main channel and floodplain for typical reaches of Lower Yellow River

Under the condition that production dykes are existed there along the channel of the Lower Yellow River，a 2-D water and sediment mathematical model for the typical reaches of the Lower Yellow River is adopted for the numerical simulation of the typical floods therein. Through the simulation，the flood routing，overbank flooding，change of river regime，flow velocity distribution and the unit-width discharge distribution of the floodplain and main channel are studied and analyzed herein，and then the diversion ratio between the floodplain and the main channel as well as the submerged areas with various submerging degrees of the floodplain are given as well. This study has a very important significance not only for defining the scope of the main channel and the floodplain to provide a clear range for compensation on the flood disaster occurred on the floodplain，but also for creating a good environment for the development of the floodplain，but also for maintaining a healthy life of the Yellow River.