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中文摘要：
环境流体动力学模型（EFDC）集水动力模块、泥沙输运模块、污染物运移模块和水质预测模块一体,可以用于河流、湖泊、水库、湿地和近岸海域一维、二维和三维物理和化学过程的模拟。为了研究多岛屿、地形及流态复杂的瓯江口海区的水动力过程,本文将EFDC模型运用于该海区潮流场和盐度场的数值模拟。对比实测资料校核了模型参数,把模拟结果和实测潮位、流速和盐度进行了比较,吻合较好,并对瓯江口海区的潮流场以及盐度场进行了详细分析,发现近岸和江口及乐清湾大部分区域往复流明显,离岸越远旋转流越明显,河口处盐度在垂线分布上呈强混合型。结果表明：该模式成功复演了瓯江口海区的潮流和盐度变化过程,可以用于模拟和分析河口及近海海域的动力场.
英文摘要：
Environmental Fluid Dynamics Code （EFDC） is fully integrated Hydrodynamic, sediment transport, toxic contaminant transport, and water quality-eutrophication simulation capabilities. The model can be used for 1, 2, or 3-Dimensional physical and chemical simulation of rivers, lakes, reservoirs, estuaries, wetlands, and coastal regions. To study the Oujiang Estuary with multi-islands, complex topography and flow patterns, the model was applied to the simulation on tidal field and salinity field in the Oujiang Estuary. Some parameters were calibrated and verified using observational data. The model data-comparisons are water elevation, flow velocity, and salinity and the simulation results agree with measured data well. According to the simulation, the characteristics of tidal flow and salinity in Oujiang Estuary were analyzed, which indicate the alternating currents are obvious in the region of nearshore, estuary and Yueqing Bay, and the farther region from coast, the more obvious are the rotary currents. The salinity is mixed on the vertical distribution in the estuary. The tidal current and salinity field were re-acted successfully in Oujiang estuary, the model can be applied in estuary and coastal regions.
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