| 台风移行速度与登陆角度对风暴潮的影响:一个理想模型数值实验 |
| |
| 引用本文： | 张晨光,李春雁.台风移行速度与登陆角度对风暴潮的影响:一个理想模型数值实验[J].海洋学报(英文版),2019,38(7):48-56. |
| |
| 作者姓名： | 张晨光 李春雁 |
| |
| 作者单位： | 美国路易斯安那州立大学海洋与近岸科学系,美国路易斯安那州立大学海洋与近岸科学系 |
| |
| 基金项目： | The National Key R & D Project under contract No. 2017YFC1404201. |
| |
| 摘 要： | The effects of hurricane forward speed(V) and approach angle(θ) on storm surge are important and a systematic investigation covering possible and continuous ranges of these parameters has not been done before. Here we present such a study with a numerical experiment using the Finite Volume Community Ocean Model(FVCOM).The hurricane track is simplified as a straight line, such that V and θ fully define the motion of the hurricane. The maximum surge is contributed by both free waves and a forced storm surge wave moving with the hurricane.Among the free waves, Kelvin-type waves can only propagate in the down-coast direction. Simulations show that those waves can only have a significant positive storm surge when the hurricane velocity has a down-coast component. The optimal values of V and θ that maximize the storm surge in an idealized semi-circular ocean basin are functions of the bathymetry. For a constant bathymetry, the maximum surge occurs when the hurricane approaches the coast from the normal direction when the free wave generation is minimal; for a stepped bathymetry, the maximum surge occurs at a certain acute approach angle which maximizes the duration of persistent wind forcing; a step-like bathymetry with a sloped shelf is similar to the stepped bathymetry, with the added possibility of landfall resonance when the free and forced waves are moving at about the same velocity. For other cases, the storm surge is smaller, given other parameters(hurricane size, maximum wind speed, etc.)unchanged.
|
| 关 键 词： | 风暴潮数值实验 FVCOM 台风移行速度 台风登陆角度 开尔文波 强迫波与自由波的相互作用 |
| 收稿时间： | 2018/11/19 0:00:00 |
Effects of hurricane forward speed and approach angle on storm surges: an idealized numerical experiment |
| |
| Zhang Chenguang and Li Chunyan.Effects of hurricane forward speed and approach angle on storm surges: an idealized numerical experiment[J].Acta Oceanologica Sinica,2019,38(7):48-56. |
| |
| Authors: | Zhang Chenguang and Li Chunyan |
| |
| Institution: | Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge LA 70803, USA |
| |
| Abstract: | The effects of hurricane forward speed (V) and approach angle (θ) on storm surge are important and a systematic investigation covering possible and continuous ranges of these parameters has not been done before. Here we present such a study with a numerical experiment using the Finite Volume Community Ocean Model (FVCOM). The hurricane track is simplified as a straight line, such that V and θ fully define the motion of the hurricane. The maximum surge is contributed by both free waves and a forced storm surge wave moving with the hurricane. Among the free waves, Kelvin-type waves can only propagate in the down-coast direction. Simulations show that those waves can only have a significant positive storm surge when the hurricane velocity has a down-coast component. The optimal values of V and θ that maximize the storm surge in an idealized semi-circular ocean basin are functions of the bathymetry. For a constant bathymetry, the maximum surge occurs when the hurricane approaches the coast from the normal direction when the free wave generation is minimal; for a stepped bathymetry, the maximum surge occurs at a certain acute approach angle which maximizes the duration of persistent wind forcing; a step-like bathymetry with a sloped shelf is similar to the stepped bathymetry, with the added possibility of landfall resonance when the free and forced waves are moving at about the same velocity. For other cases, the storm surge is smaller, given other parameters (hurricane size, maximum wind speed, etc.) unchanged. |
| |
| Keywords: | storm surge experiments FVCOM hurricane forward speed approach angle Kelvin waves forced and free surge interactions |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
