DOI: 10.1007/s11069-020-03896-y
论文题名: Proudman resonance with tides, bathymetry and variable atmospheric forcings
作者: Williams D.A. ; Horsburgh K.J. ; Schultz D.M. ; Hughes C.W.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2021
卷: 106, 期: 2 起始页码: 1169
结束页码: 1194
语种: 英语
中文关键词: Bathymetry
; Meteotsunami
; Proudman resonance
; Synthetic model
; Tides
; Variable atmospheric forcing
英文关键词: atmospheric forcing
; bathymetry
; Froude number
; tide
; tsunami
; wave force
; wave height
; wave propagation
英文摘要: Proudman resonance is a primary amplification mechanism for meteotsunamis, which are shallow-water waves generated by atmospheric forcings. The effect of tides, sloping bathymetry and the speed, amplitude and aspect ratio of the atmospheric forcing on Proudman resonant wave growth are investigated using analytical approximations and numerical models. With tides included, maximum wave growth through Proudman resonance occurred when the atmospheric-forcing speed matched the tidal-wave speed. Growth greater than Proudman resonance occurred with a positive tidal elevation together with a tidal current in the opposite direction to wave propagation, due to linear growth combined with further amplification from wave-flux conservation. Near-Proudman resonant growth occurred when the forced-wave speed or free-wave speed varied by either a small amount, or varied rapidly, around a speed appropriate for Proudman resonance. For a forcing moving at Proudman resonant speed, resultant wave growth was proportional to the total, time-integrated forcing amplitude. Finally, Proudman resonant wave growth was lower for forcings with lower aspect ratios (AP), partly because forced-wave heights are proportional to 1 + AP2, but also because free waves could spread in two dimensions. Whilst the assumptions of strict Proudman resonance are never met, near-Proudman resonant growth may occur over hundreds of kilometres if the effective Froude number is near 1 and the resultant wave propagates predominantly in one dimension. © 2020, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169461
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom; National Oceanography Centre, Liverpool, United Kingdom; School of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom
Recommended Citation:
Williams D.A.,Horsburgh K.J.,Schultz D.M.,et al. Proudman resonance with tides, bathymetry and variable atmospheric forcings[J]. Natural Hazards,2021-01-01,106(2)