Multiscale coupled three-dimensional model analysis of the tsunami flow characteristics around the Kamaishi Bay offshore breakwater and comparisons to a shallow water model
Multiscale coupled three-dimensional model analysis of the tsunami flow characteristics around the Kamaishi Bay offshore breakwater and comparisons to a shallow water model
复制标题
釜石湾近海防波堤周围海啸流特征的多尺度耦合三维模型分析及与浅水模型的比较
DOI：
10.1080/21664250.2018.1484270
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发表时间：
2018
影响因子：
2.4
通讯作者：
Nobuhito Mori
中科院分区：
文献类型：
--
作者：
William J. Pringle;Nozomu Yoneyama;Nobuhito Mori
将二维浅水-三维Navier-Stokes方程双向耦合模式（2CLOWNS-3D）应用于2011年日本釜石湾东北冲地震海啸的数值模拟。2CLOWNS-3D模拟了海啸从源头到海岸淹没的整个演变过程，其中3D模型组件用于模拟通过大型海上海啸防波堤淹没开口的水流。将2CLOWNS-3D与2DH模型模拟进行比较，以确定其优势所在。据发现，通过淹没防波堤开口的流速，从而产生的淹没高度，是相似的2DH和2CLOWNS-3D模型模拟时，适当的动量分散系数被施加到前者。然而，模型模拟之间的显着差异被确定有关;作用在水下沉箱，从防波堤发出的大型射流结构中的速度，和在防波堤附近的床剪切应力的水动力。采用可实现的k-ε湍流封闭，三维模型模拟的大尺度射流结构特征是合理的。我们的研究结果表明，2CLOWNS-3D模拟复杂的地球物理尺度流的实用价值。
A two-way coupled two-dimensional (2DH) shallow water to three-dimensional (3D) Navier–Stokes equation model, named 2-way Coupled Long Wave to Navier–Stokes 3D (2CLOWNS-3D), is applied to the 2011 Tohoku-oki Earthquake Tsunami in Kamaishi Bay, Japan. 2CLOWNS-3D simulates the entire evolution of the tsunami from its source to inundation at the coast, in which the 3D model component is used to model the flow through the submerged opening of a large-scale offshore tsunami breakwater. 2CLOWNS-3D is compared with a 2DH model simulation in order to identify where it becomes beneficial. It is found that flow rates through the submerged breakwater opening, and thus the resulting inundation heights, are similar between 2DH and 2CLOWNS-3D model simulations when an appropriate momentum dispersion coefficient is applied to the former. However, significant differences between the model simulations are identified in relation to; hydrodynamic forces acting on the submerged caissons, velocities in the large-scale jet structure emanating from the breakwater, and bed shear stresses in the vicinity of the breakwater. Furthermore, the characteristics of the large-scale jet structure simulated by the 3D model are reasonable when employing the realizable k-ε turbulence closure. Our results demonstrate the practical merit of 2CLOWNS-3D for simulating complex geophysical scale flows.