A numerical study of tsunami wave impact and run-up on coastal cliffs using a CIP-based model
A numerical study of tsunami wave impact and run-up on coastal cliffs using a CIP-based model
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使用基于 CIP 的模型对海啸波对沿海悬崖的冲击和上升进行数值研究
DOI：
10.5194/nhess-17-641-2017
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发表时间：
2017-05
影响因子：
4.6
通讯作者：
Gao Yangyang
中科院分区：
文献类型：
--
作者：
Zhao Xizeng;Chen Yong;Huang Zhenhua;Hu Zijun;Gao Yangyang
抽象的。人们普遍缺乏对海啸波与复杂地理环境的相互作用，特别是对淹没过程的了解。采用基于约束内插剖面(CIP)的数值模拟程序，研究了海底缓坡和海岸悬崖存在时，多种因素对海啸波冲击和爬高的影响。该模型采用高阶有限差分方法--CIP方法作为流动解算器，采用VOF型方法--界面捕捉/斜率加权的双曲线正切格式(THINC/SW)来捕捉自由面，并采用浸没边界方法处理固体边界。一系列入射波被安排成与不同的沿海地理位置相互作用。将数值计算结果与实验数据进行了比较，得到了较好的一致性。讨论了平缓的海底坡度、海岸悬崖和入射波高的影响。结果表明，海啸放大系数随入射波的变化受悬崖坡度的影响，其临界值约为45°。在脚趾侵蚀悬崖上的爬升比在正常悬崖上的爬升要小。爬升还与海底缓坡的长度有关，在本模型中，大多数情况下的临界值约为2.292 m。悬崖上的冲击压力极大且集中，回流效应不容忽视。我们的工作结果具有很高的精度，有助于海啸震源的反演和灾害预测。
Abstract. There is a general lack of understanding of tsunami wave interaction with complex geographies, especially the process of inundation. Numerical simulations are performed to understand the effects of several factors on tsunami wave impact and run-up in the presence of gentle submarine slopes and coastal cliffs, using an in-house code, a constrained interpolation profile (CIP)-based model. The model employs a high-order finite difference method, the CIP method, as the flow solver; utilizes a VOF-type method, the tangent of hyperbola for interface capturing/slope weighting (THINC/SW) scheme, to capture the free surface; and treats the solid boundary by an immersed boundary method. A series of incident waves are arranged to interact with varying coastal geographies. Numerical results are compared with experimental data and good agreement is obtained. The influences of gentle submarine slope, coastal cliff and incident wave height are discussed. It is found that the tsunami amplification factor varying with incident wave is affected by gradient of cliff slope, and the critical value is about 45°. The run-up on a toe-erosion cliff is smaller than that on a normal cliff. The run-up is also related to the length of a gentle submarine slope with a critical value of about 2.292 m in the present model for most cases. The impact pressure on the cliff is extremely large and concentrated, and the backflow effect is non-negligible. Results of our work are highly precise and helpful in inverting tsunami source and forecasting disaster.
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