对称和非对称台风对东海南海风暴潮影响比较

应用非结构网格的海洋数值模式FVCOM,分别模拟台风TC0509 (Matsa)、TC0519(Longwang)和TC0814(Hagupit)在长江口和杭州湾、福建沿海、珠江口和海南风暴潮,比较分析非对称台风和对称台风对风暴潮的影响.非对称台风的气压场和风场由WRF模式计算,对称台风的气压场和风场由藤田圆形台风模型计算.结果表明,对于登陆长江口和杭州湾、珠江口和南海一带的台风,WRF模式和模型台风计算的气压场和风场都能较好的模拟风暴潮,前者略好于后者.对于过台湾岛登陆福建沿海的台风,台风不对称明显,WRF模式能较好的模拟出真实的台风气压场和风场,前者模拟的风暴潮远优于后者.

Impacts of the symmetrical and unsymmetrical typhoons on the storm surge simulation in the East China and the South China Seas

An unstructured grid model based on FVCOM was used to simulate the storm surges in the regions of the Changjiang Estuary, the Hangzhou Bay, the Fujian coast, the Pearl River Estuary, and the South China Sea. Two kinds of typhoon models were compared, i.e. the unsymmetrical typhoon provided by the WRF model and the symmetrical typhoon calculated by using the Fujita formula. Both of these two typhoon models can simulate the storm surge well around the Changjiang Estuary, the Hangzhou Bay, the Pearl River Estuary and the South China Sea, with the unsymmetrical typhoon model producing the results slightly better. For the typhoons crossing the Taiwan Island and then landing along the Fujian coast, the unsymmetrical typhoon by WRF can simulate storm surge far better, since the typhoons in that region are significantly unsymmetrical.