基于FVM方法的抚河尾闾二维水动力学模型的研究和应用

Research on Two Dimension FVM Hydrodynamic Model of Fu River Estuary and Its Application

基于有限体积方法(FVM),并结合二维非结构网格,建立抚河尾闾水动力学模型。模型采用Fortran语言进行编译与计算。模拟分析了不同洪水工况下抚河尾闾改道工程对上下游水位的影响,研究了改道工程前后研究区域附近水位受鄱阳湖水位顶托影响的程度。研究表明:抚河洪水条件下,改道工程后上游沿程水位有一定程度的降低,疏浚段水位降幅最大,青岚湖区水位有所壅高,最大壅高水位在改道工程入湖口处;改道工程前后青岚湖至模型下游边界之间水位整体变化平缓,青岚湖水位受鄱阳湖水位影响较明显;受鄱阳湖水位升高影响,工程后上游水位增幅较工程前有所增加,上游水位壅高范围也明显较工程前有所增大;工程上游受鄱阳湖水位影响的敏感性相较于工程前有所增强。

Two dimension hydrodynamic model of Fu river estuary is established based on Finite Volume Method( FVM) and unstructured grid. Then the model is compiled with the Fortran language and applied to investigate the effects of Fu river estuary diversion project by simulating different flood conditions. Moreover, the influence of Poyang Lake's water level on diversion project area is analyzed.Erosion and deposition characteristics in research area are analyzed qualitative, based on the level and velocity respectively in before and after the engineering. Study refers that: after the diversion project, the upstream water level decreases, largest decreasing occurs in dredging section. While Qinglan Lake water level rises up, largest rising occurs at the estuary. Water level from Qinglan Lake to model's downstream boundary changes slowly and obviously effected by Poyang lake. As Poyang lake water level rising up, the diversion project induces upstream water level's amplification and affected region is increased, and more sensitive to Poyang lake water level.