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Rapid Assessment of Tsunami Offshore Propagation and Inundation with D-FLOW Flexible Mesh and SFINCS for the 2011 Tōhoku Tsunami in Japan
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2021-04-22 , DOI: 10.3390/jmse9050453
Björn R. Röbke , Tim Leijnse , Gundula Winter , Maarten van Ormondt , Joana van Nieuwkoop , Reimer de Graaff

This study demonstrates the skills of D-FLOW Flexible Mesh (FM) and SFINCS (Super-Fast INundation of CoastS) in combination with the Delft Dashboard Tsunami Toolbox to numerically simulate tsunami offshore propagation and inundation based on the example of the 2011 Tōhoku tsunami in Japan. Caused by a megathrust earthquake, this is one of the most severe tsunami events in recent history, resulting in vast inundation and devastation of the Japanese coast. The comparison of the simulated with the measured offshore water levels at four DART buoys located in the north-western Pacific Ocean shows that especially the FM but also the SFINCS model accurately reproduce the observed tsunami propagation. The inundation observed at the Sendai coast is well reproduced by both models. All in all, the model outcomes are consistent with the findings gained in earlier simulation studies. Depending on the specific needs of future tsunami simulations, different possibilities for the application of both models are conceivable: (i) the exclusive use of FM to achieve high accuracy of the tsunami offshore propagation, with the option to use an all-in-one model domain (no nesting required) and to add tsunami sediment dynamics, (ii) the combined use of FM for the accurate simulation of the tsunami propagation and of SFINCS for the accurate and time efficient simulation of the onshore inundation and (iii) the exclusive use of SFINCS to get a reliable picture of the tsunami propagation and accurate results for the onshore inundation within seconds of computational time. This manuscript demonstrates the suitability of FM and SFINCS for the rapid and reliable assessment of tsunami propagation and inundation and discusses use cases of the three model combinations that form an important base for tsunami risk management.

中文翻译:

用D-FLOW柔性网格和SFINCS对2011年日本东北海啸海啸在海上的传播和淹没进行快速评估

这项研究展示了D-FLOW柔性网格(FM)和SFINCS(海岸的超快速淹没)与Delft仪表板海啸工具箱相结合的技能,以2011年日本东北海啸为例,对海啸的近海传播和淹没进行了数值模拟。日本。这是由特大推力地震引起的,这是最近历史上最严重的海啸事件之一,导致日本沿海地区被大量淹没和破坏。模拟和实测的位于西北太平洋的四个DART浮标上的近海水位的比较表明,特别是FM以及SFINCS模型都能准确地再现观测到的海啸传播。两种模型都很好地再现了仙台海岸的淹没现象。总而言之,模型结果与早期模拟研究中获得的结果一致。根据未来海啸模拟的具体需求,可以考虑使用两种模型的不同可能性:(i)独家使用FM来实现海啸海上传播的高精度,并可以选择使用多合一模型域(无需嵌套)并添加海啸沉积动力学,(ii)结合使用FM来精确模拟海啸传播,使用SFINCS来精确且高效地模拟陆上淹没,以及(iii)结合使用使用SFINCS可以在几秒钟的计算时间内获得可靠的海啸传播图景,以及对岸上淹没的准确结果。
更新日期:2021-04-22
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