EFDC模型在长江口及相邻海域三维水流模拟中的开发应用  

Application and improvement of the EFDC in numerical simulating of Yangtze River Estuary and adjacent sea

作　　者：谢锐[1,2] 吴德安[1] 严以新[1] 周海 

机构地区：[1]河海大学港口海岸与近海工程学院,南京210098 [2]上海航道勘察设计研究院,上海200120

出　　处：《水动力学研究与进展（A辑）》2010年第2期165-174,共10页Chinese Journal of Hydrodynamics

基　　金：水利部公益性行业科研专项经费(200701026);国家自然科学基金项目(50709007)资助

摘　　要：基于公开代码的EFDC(Environmental Fluid Dynamics Computer Code)模型,建立了范围包括长江下游段、长江口、杭州湾及邻近海域的三维水流数值模型。用Deflt3D附带软件得到了长江口海域正交曲线网格剖分,更好地实现了网格与地形边界的拟合;并在模拟浅滩动力过程中,设置最小水深条件限制,成功地消除了复杂浅滩地形情况下原模式运行出现负水深的局限。利用10个潮位站的实测潮位以及9个流速测站的水流流速资料对模型参数进行了验证和率定。模拟结果能够与实测值较好地吻合,各站模拟计算潮位值相对误差小于10%,。率定、改造后的模型不仅能够较好地模拟反映长江口海域三维潮汐及水流运动,而且还能对潮流运动特征进行分析。该模型可用于长江口海域相关问题的进一步研究。Based on the EFDC （Environmental Fluid Dynamics Computer Code）, a three dimensional baroclinic model for lower reaches of Yangtze, Yangtze Estuary, Hangzhou Bay and the adjacent sea areas was established with the sigmacoordinate in the vertical direction and orthogonal curvilinear coordinate in the horizontal directions. The orthogonal curvilinear coordinate grids of the studied water areas were setup by the attached program of Delft3d software. Grid lines of a model fit coastlines well in order to improve local spatial resolution. The ＂dry-wet＂ method was also used to deal with the moving boundary. The minimum water depth limit condition was introduced into the mode for numerical simulation stability and avoiding producing negative depths in the shallow water areas. The improved model was used in the reaches of Yangtze, Yangtze Estuary, Hangzhou Bay and the adjacent sea area .The simulated results are fairly consistent with observations. The errors of the calculated water level and current velocity are less than 10 % compared with the observation data from 10 tidal gauging stations and 9 current gauging sites. The simulation of the current in the Yangtze estuary in September 2002 shows that the current has asymmetry due to the runoff effect, the velocity of the ebb current is larger than the flood and the ebb tide duration is obviously longer than the flood in the South Branch due to the runoff effect. The EFDC model was improved efficiently and can be used more successfully in the coastal areas for investigating Hydrodynamic-Ecological environment numeric study.

关 键 词：长江口 EFDC模型 率定 三维数值模式 

分 类 号：P731.23[天文地球—海洋科学]