Mechanism of trapped wave over an ocean ridge based on the ray theory

Wan Peng; Wang Gang; Yu Hongquan; Zhang Yao; Tao Jinbo

doi:10.3969/j.issn.0253-4193.2019.11.004

Volume 41 Issue 11

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Wan Peng，Wang Gang，Yu Hongquan, et al. Mechanism of trapped wave over an ocean ridge based on the ray theory[J]. Haiyang Xuebao，2019, 41(11)：35–39，doi:10.3969/j.issn.0253−4193.2019.11.004

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Mechanism of trapped wave over an ocean ridge based on the ray theory

doi: 10.3969/j.issn.0253-4193.2019.11.004

Wan Peng^{1, 2
,},
Wang Gang^{1, 2
,
,},
Yu Hongquan²,
Zhang Yao³,
Tao Jinbo⁴

1.
Key Laboratory of Coastal Disaster and Defence (Hohai University), Ministry of Education, Nanjing 210098, China
2.
College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
3.
National Marine Hazard Mitigation Service, Ministry of Natural Resources, Beijing 100194, China
4.
North China Sea Marine Forecasting Center, Ministry of Natural Resources, Qingdao 266061, China

Received Date: 2019-01-10
Rev Recd Date: 2019-05-15

Available Online: 2021-04-21

Publish Date: 2019-11-25

Abstract

Abstract

Although many on-site measures and numerical simulations indicate that ocean ridges can trap tsunami waves and guide them toward the far-field area, causing serious disasters, few studies have elaborated its mechanism. Based on the ray theory, this paper derives analytical solutions of the ray trajectory for trapped waves over the exponential ocean ridge. Furthermore, the completely trapped condition for tsunamis generated at top of the ridge is proposed. Based on such critical condition, the formulation of the trapped efficiency is derived to evaluate the ratio of the energy trapped by the ocean ridge to the total tsunami energy.
- trapped wave,
- ocean ridge,
- tsunami,
- ray theory,
- wave theory

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References(18)

References

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