Numerical Investigation of Tsunami Run-up along the Kido River Caused by The 2011 Tohoku Earthquakes
Numerical Investigation of Tsunami Run-up along the Kido River Caused by The 2011 Tohoku Earthquakes
复制标题
2011年东北地震引起的木户川沿岸海啸上升的数值研究
DOI：
10.1142/9789813233812_0026
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Tajima Yoshimitsu
中科院分区：
文献类型：
--
作者：
Fukazawa Souki;Tajima Yoshimitsu
海啸在河流中的爬高是更好地预测和估计洪水特性的重要特征之一。本研究对木户川周围观测到的海啸淹没进行了数值研究，特别是对海啸沿着川的上升速度进行了预测。基于非线性长波模型，通过改变海啸剖面、底摩擦力和河流流量等计算条件，对海啸波的传播进行了敏感性分析。通过分析发现，在预期的不确定性变化范围内，这些条件对海啸的预测助跑速度有一定的影响。其次，本研究亦探讨不同离散化模式对海啸上升速度预测技巧之影响。通过对无粘性Burgers方程的数值实验，研究了非线性项的保守形式和非保守形式的差异，发现保守形式和非保守形式的差异对膛压传播速度的预测有显著影响。同样的分析被应用在木户河的情况下，它被发现，海啸助跑速度增加了40%，通过选择适当的离散方案的保守形式。
Tsunami run-up through the river is one of important features for better predictions and estimations of inundation characteristics. This study carried out numerical investigations of observed tsunami inundation around the Kido river especially focusing on the prediction of run-up speed of tsunami along the river. Based on non-linear long wave model, a sensitivity analysis was first carried out by changing several computational conditions such as tsunami profile, bottom frictions and the river discharge. It was found through this analysis that these conditions, within the range of expected uncertain variations, have certain influence on predicted run-up speed of tsunami. Second, this study also investigated the influence of the different discretization schemes of the model on predictive skills of the speed of tsunami run-up. Difference of conservative and non-conservative forms of non-linear term was investigated through numerical experiments of non-viscosity Burgers equations and it was found that the difference of these forms has significant influence on the predicted propagation speed of the bore. The same analysis was applied in the case of the Kido river and it was found that the tsunami run-up speed was increased up to 40% by selecting appropriate discretization schemes of conservative form.