北部湾潮汐数值预报及其分析

NUMERICAL PREDICTION AND ANALYSIS OF THE TIDE IN BEIBU BAY

采用二维非线性运动方程和连续方程组，以多个分潮同步输入，做耦合数值模拟，进行潮汐数值预报。结果表明，K1潮波等振幅线分布与历史潮波图明显不同，此线呈舌状向北伸展，特别在湾的南部海域，其中央区振幅很小，10cm等振幅线可以伸至北纬19°以北。O1分潮的分布与K1分潮类似；北部湾北部以全日潮为主，湾的南部潮汐性质指标数2．0的等值线呈舌状向湾内神，两侧为不正规日潮，中间为不正规半日潮。4．0等值线向北推移，在19°N以南中央海区预报结果与前人的结果不同；南部海区中央一带潮差很小，最大可能潮差不超过2m，这种分布与前人结果有较大差异。

A numerical simulation was made for hdal predichon by using the 2-D nonlinear mohon equahon and the conhnulty equation and simultaneous input of severa hdal conshtuents. The equation system for the simulation are as follows:and the boundary condihon at the open boundmp is:The predicted results showed that the distribuhon of K ampitude isoline is different from that of historical hdal wave distribution. The tongue lines stretch northward, and the K1 ampitUde in the central area of southem Beibu Bay is small,with the 10cm amplitud line sthetohing as far north as 19°N The distribution of the O, conshtuent is sindlar to that of the O1 conshtuent The diurnal hde is predominant in the northem Beibu Bay, and the tongue isolines of hdal characterishcs index 2.0 in the southm Beibu Bay stretch into the Bay with the irmgular diurnal tide on its sides and the irmgular send-diumal hde in the tongue isolines. The index 4.0 isolines sbetoh northward, and the predichon results in the central area south of 19°N are different from previons results; the tidal range in the central area of the southem Beibu Bay is small, with the maximuxn possible tidal range being not grearer than 2m,which is qulte different from previous results.