渤、黄、东海潮汐开边界的1种反演方法

Inversion of the Tides with the Open Boundaries of the Bohai, Huanghai and Donghai Seas

潮汐潮流数值模拟中的 1个主要难点在于开边界条件的确定。本文采用伴随方法 ,利用渤、黄、东海的 64个验潮站资料 (潮汐调和常数 ) ,通过反演渤、黄、东海的开边界条件 ,来实现渤、黄、东海 M2 潮波的数值模拟。为了取得较好的数值模拟结果 ,同时对给定的底摩擦系数进行校正 ,计算出调和常数的模拟值与实测值之差的绝对平均值 :振幅差为 4 .0 cm,迟角差为 2 .5°。实验结果较好地体现了渤、黄、东海 M2 潮波的特征。

A major difficulty faced by numerical models of tidal currents is the treatment of open boundaries. To simulate the M 2 tide in the Bohai, Huanghai and Donghai Seas, an adjoint method and the harmonic constants at 64 tidal stations in the interior of the region were used to deduce the open boundary conditions of the Bohai, Huanghai and Donghai Seas. The mean absolute differences between the simulated and the observed were computed. The mean absolute difference of the amplitude is 4.0cm, and the mean absolute difference of the phase-lag is 2.5°. The simulation results reflect satisfactorily the charecteristics of the M 2 tide observed in the Bohai, Huanghai and Donghai Seas.