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本文采用欧拉法,计算了北部湾的欧拉余流,同时还计算了拉格朗日余流和斯托克斯漂流。计算结果表明:北部湾欧拉余流和拉格朗日余流比斯托克斯漂流大得多。K_1欧拉余流一般在15厘米/秒左右,M_2余流约8厘米/秒,而斯托克斯漂流最大不到2厘米/秒。K_1和 M_2欧拉余流都在湾北部形成一个逆时针的环流,K_1环流中心位于108°30′E,20°20′N1;M_2则位于108°45′E,20°35′N。本文还讨论了动量方程中的非线性平流项和底摩擦以及水平湍流摩擦对湾内潮汐余流的影响。由分析结果可知,北部湾潮汐余流产生的主要原因是非线性底摩擦以及动量方程中的非线性平流项,但水平湍流摩擦对湾内潮汐余流也有一定的影响。
Euler method is used in this paper to calculate the Eurasian residual flow in the Beibu Gulf and to calculate the Lagrangian residual flow and the Stokes drift. The calculation results show that the Eurasian Beleu Gulf Reserve and the Lagrangian Istasu drift much more than Stokes. K_1 Eurasian residual flow is generally about 15 cm / s, M_2 remaining about 8 cm / s, and Stokes drifting up to less than 2 cm / s. Both the K_1 and M_2 Eurasian currents form a counter-clockwise circulation in the northern part of the Bay. The K_1 circulation center is located at 108 ° 30’E and 20 ° 20’N1, while M_2 is located at 108 ° 45’E and 20 ° 35’N. The paper also discusses the influence of nonlinear advection and bottom friction in the momentum equation and horizontal turbulent friction on the tidal current in the bay. The results show that the main reason for the tidal excess flow in the Beibu Gulf is the nonlinear bottom friction and the nonlinear advection term in the momentum equation, but the horizontal turbulent friction also has some influence on the tidal current in the bay.