Numerical study of tsunami impact on coastal reef

Ren Zhiyuan; Zhao Xi; Shan Di; Wang Peitao

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Ren Zhiyuan, Zhao Xi, Shan Di, Wang Peitao. Numerical study of tsunami impact on coastal reef[J]. Haiyang Xuebao, 2017, 39(3): 1-13.

Citation:

Ren Zhiyuan, Zhao Xi, Shan Di, Wang Peitao. Numerical study of tsunami impact on coastal reef[J]. Haiyang Xuebao, 2017, 39(3): 1-13.

Ren Zhiyuan, Zhao Xi, Shan Di, Wang Peitao. Numerical study of tsunami impact on coastal reef[J]. Haiyang Xuebao, 2017, 39(3): 1-13.

Citation:

Ren Zhiyuan, Zhao Xi, Shan Di, Wang Peitao. Numerical study of tsunami impact on coastal reef[J]. Haiyang Xuebao, 2017, 39(3): 1-13.

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Numerical study of tsunami impact on coastal reef

1.
National Marine and Environmental Forecast Center, Beijing 100081, China;National Tsunami Warning Center, State Oceanic Administration, Beijing 100081, China
2.
Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, China

Received Date: 2016-03-18

Abstract

Abstract

In this study, tsunami generation and propagation model involved trans-Pacific (China's offshore)-local-coastal reef has been established, based on Okada model, nonlinear shallow water equations, and coupled grid with high resolution. The Phoenix Island in Sanya City is selected as research subject. Firstly, the simulation of 2011 Japan Tohoku tsunami has been carried out, and the characteristics of tsunami propagation along the continental shelf of Chinese coasts and the impacts on Phoenix Island are presented, combined with real-time measurements. The impacts of tsunami source along Manila Trench, Ryukyu Trench, and 21 extreme sources around Pacific on Phoenix Island are discussed. According to characteristics of tsunami wave near the Phoenix Island, the amplification effect of tsunami wave near coastal reef is discussed based on Fouriers analysis. It turns out that relatively moderate tsunami near Chinese coasts and extreme trans-Pacific tsunami will have some impacts on Phoenix Island, which may induce tsunami of maximum amplitude reached 1 m. The travel time ranges from 3 h to 27 h. Due to the impact of southeast peninsula Sanya, tsunami from Ryukyu Trench and trans-Pacific tsunami will generate less amplification effect than Manila Trench due to wave diffraction, whose frequency are in the range of 0.8×10^-4-2×10^-4 Hz. The tsunami from Manila Trench may produce obvious amplification effect, and require more attention.
- tsunami wave,
- coastal reef,
- numerical simulation,
- Phoenix Island,
- amplification effect

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References(27)

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