瓯江河口潮流水动力场数值模拟
Numerical Simulation of Tide Hydrodynamic Field in Oujiang Estuary

针对瓯江口的复杂地形和强潮条件，建立了正交曲线坐标系下的3D、非恒定瓯江口潮流水动力学模型，研究了瓯江口在径流与潮汐共同作用下的水动力学特点。模型区域梅岱至洞头长约80 Km，计算网格8693个。模型应用2010年大、中和小潮条件，对8个站点潮位及6个站点的流场进行了验证，模拟了不同潮汐和径流条件下的潮位及水动力场变化。模型值与实测值吻合较好，模型有较好适应性，能满足波流作用下的瓯江口水动力研究，并可用于模拟建筑物对水动力场的影响。
Considering the complex topography and strong tide conditions of Oujiang Estuary, the 3D, time- dependent hydrodynamic model under orthogonal curvilinear coordinate system was established, and the characteristics of the interaction of runoff and tide in Oujiang Estuary was studied. The length of the model area from Mei’ao to Dongtou is about 80 km, with 8693 computational grids. The model was applied to verify the flow field of 8 stations and 6 stations under the conditions of spring, middle and neap tides in 2010, and simulated the changes of tidal level and hydrodynamic field under different tidal and runoff conditions. The model values are in good agreement with the measured values, and the model has good adaptability. It can be used to simulate the influence of buildings on hydrodynamic field.