北部湾潮汐潮流的三维数值模拟  

Three-dimensional numerical simulation for tide and tidal current in the Beibu Gulf

作　　者：孙洪亮[1] 黄卫民[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海洋学报》2001年第2期1-8,共8页

基　　金：广西壮族自治区资助项目!(9734)

摘　　要：基于二阶湍流闭合模型计算涡动粘性系数的POM三维水动力模式 ,采用细网格 ,考虑 6个岛屿、海底摩擦系数进行划片取值 ,模拟北部湾潮汐潮流 .所得潮汐调和常数与 81个实测站比较 ,绝对平均误差 :K1分潮振幅为 4 6cm ,迟角为 9°;O1分潮振幅为 5 6cm ,迟角为 7° ;M2 分潮振幅为 6 2cm ,迟角为 1 5°.由模拟结果分析出该海区潮汐、潮流、余水位和潮余流 。By means of three dimensional POM model, which computes the eddy viscosity coefficient based on two-order turbulent closed model, the tide and tidal current in the Beibu Gulf are simulated with fine grid. In the computed region, six of islands are considered and the bottom friction coefficients are taken to be various values from the difference of sea region. The results show that: (1) comparing the computed values with those of 81 tidal observatories, the absolute mean errors for three constituent amplitudes of O 1, K 1 and M 2 are respectively 5.6, 4.6 and 6.2 cm, and the lags are respectively 7°, 9° and 15°;(2) the irregular diurnal tide and regular diurnal tide dominate in the Beibu Gulf. There are a no tide point of K 1 constituent at the east side of the Thuan An and a no tide point of O 1 constituent at the west side of the Thuan An. It remains to be further demonstrated hereafter; (3) the residual water level is less in the Beibu Gulf and its distribution trend is basically consistent with that got by Cao Diming et al. , but there is the lowest residual water level of -3.5 cm in the Qiongzhou Straits. The westward tide induced residual current exists in the Qiongzhou Straits and the northward tide induced residual current exists near the west shore of the Hainan Island; (4) the vertical change of horizontal velocity is not large and the direction of maximum current velocity is slightly to the left from surface to bottom, while the occurring time of maximum current velocity is generally in advance in the bottom layer.

关 键 词：北部湾 潮汐 潮流 POM 三维数值模拟 涡动粘性系数 余水位 潮余流 

分 类 号：P722.7[天文地球—海洋科学] P731.23