地震海啸数值模拟中海洋水深数据的敏感性研究
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摘要
海洋水深数据是进行海啸数值模拟计算最基础的输入数据之一。目前可供使用的数据源较多,各种数据源之间的差异性以及数据自身误差是否会对海啸数值模拟产生影响值得关注。以中国南海为研究对象,以马尼拉海沟俯冲区为潜在震源区,研究了水深数据的数据源差异性以及数据自身误差对于地震海啸数值模拟的敏感性。结果表明,在开阔的外海海域,不同数据源之间的水深数据差异对于海啸数值模拟的影响可忽略;水深数据自身误差对于数值模拟的海啸波幅值的影响不明显,但对于其相位则存在一定的影响。综合而言,目前开放的海洋水深数据对在开阔的外海海域的海啸传播数值模拟是满足要求的。
The bathymetry data is one of the key inputs in the numerical simulation of tsunami. At present,multiple sources of bathymetry data are available. It needs to clarify whether the differences among these data sources or the data self-errors have an influence on the tsunami numerical simulation. We study the sensitivity of bathymetry data in the numerical simulation of earthquake tsunami by some case studies in the South China Sea. The results show that the differences between different kinds of bathymetry data have a negligible influence on the tsunami numerical simulation; the errors of bathymetry data itself do not affect the simulated wave amplitudes,but obviously affect the wave phases. In a word,the present opening bathymetry data may satisfy the demand on numerical simulation of tsunami propagation in a broad open sea.
引文
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