DOI: 10.1007/s11069-020-04328-7
论文题名: Convective rear-flank downdraft as driver for meteotsunami along English Channel and North Sea coasts 28–29 May 2017
作者: Sibley A.M. ; Cox D. ; Tappin D.R.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2021
卷: 106, 期: 2 起始页码: 1445
结束页码: 1465
语种: 英语
中文关键词: Coast of Holland
; Gravity wave
; Meteotsunami
; Proudman resonance
; Rear flank dowdraft
英文关键词: climate modeling
; convective system
; gravity wave
; resonance
; tsunami event
; wind field
; English Channel
; Netherlands
; North Sea Coast [Netherlands]
英文摘要: We examine the physical processes that led to the meteotsunami observed along the English Channel and North Sea coasts on 29 May 2017. It was most notably reported along the Dutch coast, but also observed on tide gauges from the Channel Islands to the coast of Germany, and also those in eastern England. From an assessment of multiple observations, including rain radar, LIDAR, satellite, surface observations and radiosonde reports we conclude that the event was driven by a rear flank downdraft in association with a mesoscale convective system (MCS). This downdraft, from a medium level or elevated MCS, led to a hydrostatically forced internal or ducted gravity wave below the MCS. The gravity wave was manifested by a marked rise and fall in pressure, a meso-high, which then interacted with the sea surface through Proudman resonance causing a measured wave of close to 0.9 m in amplitude, and an estimated wave run-up on Dutch beaches of 2 m. Through examination of existing research, we show that the basic assumptions here relating to the formation of the Dutch meteotsunami are consistent with previously described physical processes, and confirm the correlation between the speed of the ocean wave and medium level steering winds. This raises the possibility that high-resolution, coupled, weather-ocean numerical weather prediction (NWP) models can be utilised to predict future events. However, deterministic high-resolution NWP models still struggle with modelling convective systems with sufficient precision because of the chaotic nature of the atmosphere and incomplete observations. A way forward is proposed here to improve forecasting through post-processing of NWP model output by overlaying medium level wind fields with ocean bathymetry. © 2020, Crown. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169364
Appears in Collections: 气候变化与战略
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作者单位: Met Office, Hazard Centre, Fitzroy Road, Exeter, EX12 3PB, United Kingdom; Met Office, Flood Forecasting Centre, Fitzroy Road, Exeter, EX12 3PB, United Kingdom; British Geological Survey, Keyworth, Nottingham, NG12 5GG, United Kingdom; Department of Earth Sciences, University College London (UCL), London, United Kingdom
Recommended Citation:
Sibley A.M.,Cox D.,Tappin D.R.. Convective rear-flank downdraft as driver for meteotsunami along English Channel and North Sea coasts 28–29 May 2017[J]. Natural Hazards,2021-01-01,106(2)