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该文研究了开阔海域中越洋海啸波高的简化计算方法。基于选取具有一系列断裂带长宽比的震源参数,采用Okada弹性变形理论生成初始海底变形,运用基于有限体积法的非线性浅水方程数值模型,模拟地震激发海啸在4 000 m水深的平底地形上的传播过程。通过监测布置在相对震源中心不同距离及方位角上测点的波面时间序列,研究海啸波高在不同距离及方位角上的分布规律,给出不同断裂带长宽比下越洋海啸传播过程中首波幅值的分布关系式;进一步分析了断裂带长宽比对模型参数的影响,得出了归一化的越洋海啸波高计算经验公式,并与日本2011年海啸实际记录进行对比,验证了该近似方法的有效性。
This paper studies a simplified method to calculate the wave height of the offshore tsunami in the open ocean. Based on the selection of source parameters with a series of fault length and width ratios, the Okada elastic deformation theory is used to generate the initial submarine deformation. The nonlinear shallow water equation based on the finite volume method is used to simulate the tsunami-induced tsunami at 4 000 m depth The spread of the process. By monitoring the wave surface time series of the measuring points arranged at different distances and azimuths relative to the center of the source, the distribution of tsunami wave height at different distances and azimuths is studied, and the first wave of the transgressive tsunami propagation in different fault zones is given The influence of the aspect ratio of the fracture zone on the model parameters is further analyzed, and the empirical formula of wave height calculation of the normalized transoceanic tsunami is obtained and compared with the actual record of the tsunami in Japan in 2011. The results show that The validity of the approximate method.