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采用有限体积三维近岸海洋模型,建立无结构三角形网格,对当今地形下的黄河口海域进行高分辨率数值模拟,在成功模拟渤海潮汐潮流的情况下,重点研究了黄河口海域。当前黄河口附近海域潮汐为不规则半日潮,潮流为往复流,方向近似平行于岸界,潮致欧拉余流在岬角两侧存在成对的涡旋,涡旋的方向为南顺北逆,黄河径流对此涡旋有加强的作用。由于地形等复杂因素的影响,河口海域附近在涨落潮转换过程中存在内涨外落型和内落外涨型切变锋,其首先出现在浅水区域,然后向深水区域传播,1~2 h后消失,它的产生是由于近岸海域潮汐相位领先于外海海域潮汐相位。
Using the finite volume 3D coastal ocean model, the unstructured triangular grid was established to simulate the Yellow River Estuary waters under the current terrain in high resolution. In the case of tide tidal current simulation in the Bohai Sea, the Yellow Sea Estuary was studied. At present, the tides near the Yellow River estuary are irregular semi-diurnal tidal currents with reciprocating currents, and the directions are approximately parallel to the shoreline. The tide-induced Eurasian currents have pairs of vortices on both sides of the headland, and the direction of vortexes is Nanshubeikun The runoff of the Yellow River has a strengthening effect on this vortex. Due to the influence of complex factors such as the terrain, there are internal and external shear-type shear extremes near the estuarine waters during the transition of the ebb and flow, which first appeared in the shallow water region and then spread to the deep water region. h disappeared, it is generated due to the tidal phase of the coastal waters ahead of the tidal phase of the sea.