Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhess-2017-37
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
02 Feb 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
A numerical study of tsunami wave run-up and impact on coastal cliffs using a CIP-based model
Xizeng Zhao1, Yong Chen1, Zhenhua Huang2, and Yangyang Gao1 1Ocean College, Zhejiang University, Zhoushan Zhejiang 316021, China
2Department of Ocean and Resources Engineering, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, USA
Abstract. There is a general lack of the understanding of tsunami wave interacting 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 submarine gentle slopes and coastal cliffs, using an in-house code, named a Constrained Interpolation Profile (CIP)-based model in Zhejiang University (CIP-ZJU). 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 submarine gentle slope, coastal cliff and incident wave height are discussed. It is found that the rule of tsunami amplification factor varying with incident wave is affected by angle of cliff slope, and there is a critical angle 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 submarine gentle slope with a critical about 2.292 m in the present study. The impact pressure on the cliff is extremely large and concentrated, and the backflow effect is nonnegligible. Results of our work are in high precision and helpful in inversing tsunami source and forecasting disaster.

Citation: Zhao, X., Chen, Y., Huang, Z., and Gao, Y.: A numerical study of tsunami wave run-up and impact on coastal cliffs using a CIP-based model, Nat. Hazards Earth Syst. Sci. Discuss., doi:10.5194/nhess-2017-37, in review, 2017.
Xizeng Zhao et al.
Xizeng Zhao et al.
Xizeng Zhao et al.

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Short summary
Numerical simulations are performed to understand the effects of several factors on tsunami wave impact and run-up in the presence of submarine gentle slopes and coastal cliffs using an in-house code. The run-up on a toe-erosion cliff is smaller than that on a normal cliff. Two impact pressure peaks exist during the tsunami wave run-up and impact. One is the direct impact pressure when tsunami waves first hit the coastal cliff, and the other is caused by the backflow from the cliff run-up.
Numerical simulations are performed to understand the effects of several factors on tsunami wave...
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