舟山海域台风浪数值模拟

Numerical simulation of typhoon wave in Zhoushan

为提高台风浪模拟的精度,将Holland台风风场模型与CCMP背景风场相叠加,构造合成风场来驱动SWAN模型。运用Jason-2卫星数据进行验证,比较了不同的最大风速半径计算公式和Holland B参数组合构造出的合成风场对模拟结果影响。选取最优组合,运用自嵌套,模拟了台风"米雷"通过舟山海域的波浪场。结果表明舟山群岛对台风浪的阻挡效果明显,台风期间舟山东部海域波高大、周期长且涌浪影响明显,西部海域波高较小且以风浪影响为主。

To improve the accuracy of near-shore typhoon wave simulation, numerical simulations were made for typhoon during the period of typhoon Meari, based on SWAN, with combination of the Holland model wind field and CCMP wind field. The Jason-2 satellite data were used to verify the simulation results. The merged wind fields constructed by different maximum wind speed radius formula and parameter B were compared. Then, the typhoon Meari was simulated by adopted nested grid in SWAN. The results demonstrate that the retarding effect of Zhoushan Archipelago for typhoon wave is significant. During typhoon period, the significant wave height in the offshore areas of eastern Zhoushan Archipelago is higher than the one of the west. The offshore areas of eastern Zhoushan Archipel-ago are greatly affected by surge while the western Zhoushan Archipelago areas are dominated by wind wave.