马尔代夫海域水位、海流数值预报研究

基于无结构有限体积法海洋模式(FVCOM),建立了马尔代夫双重嵌套的水位、海流预报模式,并实现了业务化运行。利用三角网格提高重点区域(马尔代夫大桥及岛屿附近海域)的分辨率,最高网格分辨率达到45 m。垂向分层采用σ-s混合坐标的方式划分,分为31层,分别在表层和底层进行加密。采用GFS预报的风场、气压场和热通量结果制作模式表面强迫场文件。在开边界处与HYCOM预报结果进行嵌套,在斜压条件下,采用热启动的方式,业务化模拟了马尔代夫海域2020年的水位流场过程。结果表明,模式能够较好地再现计算海域内天文潮和综合水位的预报,模式预报的水位值与潮位站实测值非常接近。

Research on numerical prediction of water level and current in Maldives

Based on the Unstructured Grid, Finite-Volume Community Ocean Model (FVCOM), a nested water level and current forecast model in the Maldives was established and operationalized. The triangular grid was used with high resolution of key areas (sea area nearby the Maldives Bridge). The highest grid resolution reaches 45 m. Vertically the model set 31layersby -s mixed coordinates, which are encrypted at the surface and the bottom layers. Wind, air pressure and heat flux predicted by GFS are used as the surface forcing. Nested with the HYCOM forecast results at the open boundary, this study uses the hot start method under baroclinic conditions to operationally simulate the water level and flow process in the Maldivian waters in 2020. The results show that the model can reproduce the calculation of the astronomical tide and the comprehensive water level forecast in the study area. The water level predicted by the model are very close to the measured values at the Male station.