南海西北部正压潮的数值模拟

Numerical Simulation of Barotropic Tide in the Northwestern South China Sea

利用1/30°分辨率三维POM(Princeton Ocean Model)模式,以M2、S2、K1、O14大分潮作为潮汐边界条件,模拟南海西北部(105.5-115°E,16-23°N)海域正压潮,分析琼州海峡及其附近区域正压潮能通量分布特征。结果表明,研究海域内M2分潮和全日潮都是顺时针传入北部湾,然后自西向东通过琼州海峡,直至琼州海峡东口;计算所得穿过琼州海峡中部(110°E断面)能通量为M2,0.2GW或m1,0.47GW;穿过北部湾湾口(18.5°N断面)能通量为M2,1.0GW或m1,2.5GW;海南岛西部和琼州海峡处潮能耗散最强。

Based on a 1/30° resolution, three dimensional POM （Princeton Ocean Model） with boundary conditions of four main constituents M2, S2 K1 and O1, barotropic tide in the northwestern South China Sea is simulated and the distribution characteristics of its energy flux in Qiongzhou Strait （QS） and its adjacent region is analyzed. The results show that both M2 constituent and diurnal tide propagate into the Beibu Gulf clockwise, through the QS from west to east, till to its eastern entrance, which is different from the previous understanding on tide wave in the QS. Computed energy flux through middle part of the QS （section 110°E） is 0.2GW forM2 tide and 0.47GW for m1 tide, and the energy flux via the entrance of Beibu Gulf （section 18.5°N） is 1.0GW forM2 tide and 2.5GW for m1 tide. Strong tidal dissipation happens near west of Hainan Island and the QS.