浙江沿海超强台风作用下的台风浪波高

基于 SWAN 波浪传播模型建立包含风暴潮与天文潮耦合传播的台风浪数值模型,通过多次台风引起的波浪模拟,证实该模型可适用于浙江沿海.将1949年以来登陆我国大陆沿海最强的“5612”号台风作为典型的超强台风,计算了超强台风在浙北至浙南3个不同地点登陆遭遇天文潮高潮位时产生的沿海波高过程.结果显示,在开敞海区,登陆点南侧附近及其以北沿海,台风登陆时过程最大有效波高与风暴高潮位基本同时出现,而在登陆点以南远区的沿海海域,最大有效波高出现在登陆前的一个高潮位附近;超强台风作用下浙江陆域沿海离岸近1 km 范围内有效波高可达4耀6 m.这些结论对海堤工程设计和防灾减灾具有重要意义.

Typhoon-generated wave height due to the super typhoon in the coastal region of Zhejiang Province

A numerical model of typhoon-generated wave based on SWAN model,including the coupled propagation of astronomical tide and storm surge,is confirmed to be suitable for the prediction of typhoon-generated wave in the coastal region of Zhejiang Province by simulation of wave caused by many times of typhoons.Typhoon No.5612,the most intense to land in China since 1949,was taken as the typical super typhoon for the design of 3 typhoon routes,landing at different locations along the coast from north to south.The typhoon-generated wave processes along the coast were calculated by the model under the conditions of typical typhoons coinciding with the spring high tidal level when they landed.The results showed that the largest significant wave height and storm high tidal level occurred simultaneously along the north coast of landing location and the south coast nearby in the open sea area when typical typhoon landed,while in the far south of landing area,the largest wave height occurred before typhoon landed,in addition,significant wave height could reach up to 4~6 m in the area from 1km offshore to the coast under the action of super-typhoon in Zhejiang Province.The results have practical significance for the design of coastal engineering and minimization of damage during super typhoons.