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海啸俘获波在弯曲海脊上的传播规律
引用本文:于洪荃,胡见,王岗,张尧,郑金海.海啸俘获波在弯曲海脊上的传播规律[J].海洋学报,2020,42(1):40-45.
作者姓名:于洪荃  胡见  王岗  张尧  郑金海
作者单位:1.河海大学 海岸灾害及防护教育部重点实验室,江苏 南京 210098
基金项目:国家重点研发计划(2017YFC1404205);国家自然科学基金面上项目(51579090);中央高校基本科研业务费(2019B12214);‘青蓝工程’。
摘    要:越洋海啸会受大洋海脊的引导以俘获波的形式沿其传播上万千米,其携带的巨大能量会严重影响远场地区、威胁海岸地区的安全。本文基于MIKE21-BW模型,分别模拟0°(直海脊)至90°(直角弯曲海脊)不同弯曲角度海脊上俘获波的传播变形过程,并定量比较其能量分配。结果表明,海脊俘获波传至海脊转弯处,少部分能量会泄露出海脊重新以自由波的形式扩散至整个海域;部分能量会被反射回来形成与初始海啸波相反方向的俘获波沿海脊传播,反射的能量会随着海脊弯曲角度的增加而增加;还有一部分能量继续沿着弯曲的海脊向前传播,其随着海脊弯曲的角度增加而减小。

关 键 词:海啸  弯曲海脊  俘获波  Boussinesq模型
收稿时间:2019/5/16 0:00:00
修稿时间:2019/9/2 0:00:00

Trapped tsunami waves propagation over curved ocean ridges
Yu Hongquan,Hu Jian,Wang Gang,Zhang Yao and Zheng Jinhai.Trapped tsunami waves propagation over curved ocean ridges[J].Acta Oceanologica Sinica (in Chinese),2020,42(1):40-45.
Authors:Yu Hongquan  Hu Jian  Wang Gang  Zhang Yao and Zheng Jinhai
Affiliation:1.Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing 210098, China2.Yangtze River Shipping Development Research Center, Wuhan 430014, China3.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China4.National Marine Hazard Mitigation Service, Ministry of Natural Resources, Beijing 100194, China
Abstract:Transoceanic tsunami guided by oceanic ridges can propagate to tens of thousands of kilometers away in the form of trapped waves, which threatens the safety in far field. MIKE21-BW was used to simulate trapped waves propagation over ocean ridge with curved degree varying from 0° (straight ridge) to 90° (right-angle ridge) and the energy distribution was examined. The results show that when the trapped waves propagate to the bend of ocean ridge, a little part of the energy leaks out of it and scatters in the other area as free waves. Some of the energy is reflected back and propagate along the ocean ridge in the opposite direction, and it increases with the curved angle of the ocean ridge. The other energy continues to propagate along the curved ocean ridge and it increases with the curved angle of the ocean ridge.
Keywords:tsunami  curved oceanic ridge  trapped waves  Boussinesq model
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