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 TPXO7. 1, using a 3-layer nested grid system. Tide-tsunami interactions are investigated in Shenzhen Wa-rnters. 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 cm. Based on tide simulations , tsunamis induced by the hypothetical earthquakes of 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. OMw 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.%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15 cm,20 em;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140～150 cm,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25.0 cm之内,到达时间差异小于6 min.
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