深圳海域潮汐海啸波耦合数值研究  

Numerical study for tide-tsunami coupling model in Shenzhen Waters

作　　者：李林燕[1] 毛献忠[1] 

机构地区：[1]清华大学深圳研究生院环境工程与管理研究中心,广东深圳518055

出　　处：《海洋学报》2012年第3期11-18,共8页

基　　金：国家自然科学基金项目(41176001);深圳市科技计划项目(2008年)

摘　　要：以COMCOT海啸模式和TPXO7.1全球潮汐模式为基础,采用三层嵌套网格,建立了南海海啸与潮汐耦合计算模型,分析深圳海域海啸和潮汐相互作用。潮汐计算结果与实测数据吻合较好,高、低潮位平均误差小于15cm,20cm;在潮汐验证的基础上,以马尼拉海沟潜在地震海啸源为案例,进行8.0,9.0级地震海啸与潮汐耦合情景模拟计算,计算结果表明,9级地震海啸在深圳海域外海波高为140～150cm,如先行波为正波发生在高潮时将产生异常高潮位,负波发生在低潮时将产生异常低潮位,线性叠加计算结果偏大,在25.0cm之内,到达时间差异小于6min。This paper describes a coupling model that simulates tsunami and the astronomical tide in the South China Sea. The coupling model is based on the tsunami model COMCOT and the global tide model TPXOT. 1, using a 3-layer nested grid system. Tide-tsunami interactions are investigated in Shenzhen Waters. The computed results of tide simulations are in good agreements with observations with the average errors for the high and low tide level less than 15 cm and 20 em. Based on tide simulations, tsunamis in- duced by the hypothetical earthquakes o{ the magnitude 8.0 and 9.0 in the Manila Trench are adopted as scenarios to simulate the tsunamis and tides interaction. The computed results show that, the tsunami wave height for 9.0Mw earthquake is about 140--150 cm outside Shenzhen Waters; and if the first tsunami wave is a positive wave which occurs at high tide level, the tsunami tide level will be extreme high, while a negative wave occurs at low tide level, the tsunami tide level will be extreme low. Compared with the coupling results, the wave height of tsunami calculated separately is about 25.0 cm higher, and the difference of tsunami arrival time is less than 6.0 mins.

关 键 词：COMCOT模式 海啸 潮汐 耦合计算 深圳海域 

分 类 号：P731.25[天文地球—海洋科学]