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Experimental and numerical investigation on tsunami run-up flow around coastal buildings
Coastal Engineering Journal ( IF 2.4 ) Pub Date : 2021-07-12 , DOI: 10.1080/21664250.2021.1949920
Hidenori Ishii 1 , Tomoyuki Takabatake 2 , Miguel Esteban 1 , Jacob Stolle 3 , Tomoya Shibayama 1
Affiliation  

ABSTRACT

Inland tsunami flows can be greatly affected by the presence of coastal buildings. The present study experimentally and numerically investigated the effects of nine different building layouts on 1) the tsunami inundation process and spatial velocity distribution, 2) the flow depth and velocity at a specific point, and 3) the extent of the area where shielding effects take place. High-speed video footage, PIV analysis, and the time history of flow depth, surface velocity and momentum flux demonstrated significant differences in the tsunami run-up behavior among the different building layouts considered. However, it was also shown that a decrease in the surface velocity of flow always appears in front of and immediately behind the building(s), regardless of their layouts. The OpenFOAM simulations performed revealed that significant shielding effects appear in the leeside of the building. These findings can be used when considering where to place evacuation buildings, as constructing them directly behind another study structure could reduce construction costs and increase their stability. The obtained results were also applied to partially validate the method for calculating the channeling effects of tsunami loads provided in ASCE 7–16.



中文翻译:

沿海建筑物周围海啸上升流的实验和数值研究

摘要

沿海建筑物的存在会极大地影响内陆海啸流动。本研究通过实验和数值研究了九种不同的建筑布局对 1) 海啸淹没过程和空间速度分布,2) 特定点的水流深度和速度,以及 3) 屏蔽效应产生的区域范围的影响地方。高速视频片段、PIV 分析以及水流深度、表面速度和动量通量的时间历程表明,所考虑的不同建筑布局之间的海啸上升行为存在显着差异。然而,还表明无论建筑物的布局如何,表面流速的降低总是出现在建筑物的前面和后面。进行的 OpenFOAM 模拟表明,建筑物的背风侧出现了显着的屏蔽效应。在考虑将疏散建筑物放置在何处时可以使用这些发现,因为将它们直接建造在另一个研究结构的后面可以降低施工成本并提高它们的稳定性。所获得的结果还用于部分验证 ASCE 7-16 中提供的计算海啸载荷通道效应的方法。

更新日期:2021-07-12
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