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本文首先用二维非线性模式对渤海海峡的M_2分潮进行数值模拟,求得逐太阴时潮位和潮流场,进而导出欧拉型的潮余流,计算结果与实测资料符合良好。 在潮流模拟的基础上,对海峡中投放的标识质点的拉格朗日运动进行数值跟踪,获得典型潮时起算的拉格朗日漂移和拉格朗日余流,与欧拉余流相似,拉格朗日余流也呈北大南小之势,但二者的量值并不相同。对于确定的潮流场,欧拉余流是定常的,而拉格朗日余流却是潮位相的函数。
In this paper, the numerical simulation of M_2 tide in the Bohai Strait is carried out by using two-dimensional nonlinear model. The tidal current and tidal current flow of the Bohai Strait are obtained. The Euclidian tidal current is derived. The calculated result is in good agreement with the measured data. On the basis of the tidal current simulation, the Lagrangian movement of the marked particles placed in the Strait is numerically tracked to obtain the Lagrangian drift and Lagrangian residual flow since the typical tidal time. Similar to the Eurasian residual flow, Lagrangian I also showed a small trend in North South, but the magnitude of the two are not the same. The Eulerian residual flow is constant for the defined tidal current, but the Lagrangian residual flow is a function of the tidal phase.