Rapid assessment of tsunami source impacts on low-lying coastal areas using offshore wave superposition and static sweep of onshore terrain
Rapid assessment of tsunami source impacts on low-lying coastal areas using offshore wave superposition and static sweep of onshore terrain
复制标题
利用近海波浪叠加和陆上地形静态扫描快速评估海啸源对低洼沿海地区的影响
DOI：
10.1080/21664250.2021.2005364
复制
发表时间：
2021
影响因子：
2.4
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Yamanaka;Y.;Shimozono;T.
应彻底调查沿海地区的海啸震源影响；然而，调查相关的震源不确定性可能会产生巨大的计算成本。这项研究提出了一种基于格林函数线性波叠加法和岸上地形静态扫描算法相结合的快速评估影响及其不确定性的技术。根据由线性化Boussinesq模型模拟的上述单点震源的叠加，在岸上快速估计来自海啸震源的波形。然后确定波形中的最大水面高程变化，即最大海啸高程。此外，还使用扫描算法扫描可能被海啸淹没的陆上地形的数字高程模型，以静态比较海啸和地面高程。因此，地面海拔低于海啸的地区很快就被确定为潜在的海啸危险区。这一综合分析被应用于评估日本海潜在的海啸源，并对日本坂田和秋田市的海啸源影响进行了全面的调查。我们的分析成功地定量地指出了源头影响，同时考虑到它们的巨大不确定性。此外，迅速有效地确定了扩大海啸淹没的关键区域。
Tsunami source impacts in coastal areas should be investigated thoroughly; however, investigating the associated source uncertainties can incur large computational costs. This study presents a technique for rapid assessment of the impacts and their uncertainties based on a combination of the linear wave superposition for Green’s functions and a static sweep algorithm for onshore terrain. A waveform from a tsunami source is quickly estimated at a shore based on the aforementioned superposition of single-point sources simulated by a linearized Boussinesq model. The maximum water surface elevation change in the waveform, the maximum tsunami elevation, is then determined. In addition, a digital elevation model for onshore terrain that can be inundated by a tsunami is scanned using the sweep algorithm to statically compare the tsunami and ground elevations. As a result, areas with lower ground elevation than the tsunami are quickly identified as potential tsunami hazard zones. This combined analysis is applied to assess potential tsunami sources in the Japan Sea, and the source impacts are comprehensively investigated for Sakata and Akita cities in Japan. Our analysis successfully and quantitatively indicates source impacts while considering their great uncertainty. Additionally, critical areas for expanding tsunami inundation are quickly and efficiently identified.