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首页> 外文期刊>Journal of Physical Oceanography >Examination of Generation Mechanisms for an English Channel Meteotsunami: Combining Observations and Modeling
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Examination of Generation Mechanisms for an English Channel Meteotsunami: Combining Observations and Modeling

机译：英语频道Meteotsunami生成机制的检验：结合观察和建模

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On the morning of 23 June 2016, a 0.70-m meteotsunami was observed in the English Channel between the United Kingdom and France. This wave was measured by several tide gauges and coincided with a heavily precipitating convective system producing 10 m s(-1) wind speeds at the 10-m level and 1-2.5-hPa surface pressure anomalies. A combination of precipitation rate cross correlations and NCEP-NCAR Reanalysis 1 data showed that the convective system moved northeastward at 19 +/- 2 m s(-1). To model the meteotsunami, the finite element model Telemac was forced with an ensemble of prescribed pressure forcings, covering observational uncertainty. Ensembles simulated the observed wave period and arrival times within minutes and wave heights within tens of centimeters. A directly forced wave and a secondary coastal wave were simulated, and these amplified as they propagated. Proudman resonance was responsible for the wave amplification, and the coastal wave resulted from strong refraction of the primary wave. The main generating mechanism was the atmospheric pressure anomaly with wind stress playing a secondary role, increasing the first wave peak by 16% on average. Certain tidal conditions reduced modeled wave heights by up to 56%, by shifting the location where Proudman resonance occurred. This shift was mainly from tidal currents rather than tidal elevation directly affecting shallow-water wave speed. An improved understanding of meteotsunami return periods and generation mechanisms would be aided by tide gauge measurements sampled at less than 15-min intervals.
机译：2016年6月23日上午，在英国和法国之间的英吉利海峡观测到0.70米的海啸。该波是由几个潮汐仪测量的，并且与一个强降水对流系统一致，该对流系统在10-m水平和1-2.5-hPa表面压力异常下产生10 m s（-1）风速。降水率互相关和NCEP-NCAR Reanalysis 1数据的结合显示，对流系统在19 +/- 2 m s（-1）处向东北移动。为模拟海啸，对有限元模型Telemac施加了规定的压力强迫，涵盖了观测的不确定性。集合模拟了几分钟内观察到的波浪周期和到达时间，而波浪高度则在几十厘米以内。模拟了直接强迫波和次要沿海波，它们在传播时被放大。普罗德曼共振是波放大的原因，而沿海波则是由一次波的强折射引起的。主要的产生机理是大气压力异常，其中风应力起次要作用，使第一波峰值平均增加了16％。通过改变发生Proudman共振的位置，某些潮汐条件将模拟波高降低了多达56％。这种变化主要来自潮流，而不是潮汐高程直接影响浅水波速度。以不到15分钟的间隔对潮汐仪进行测量，将有助于更好地了解气象海啸的返回周期和生成机制。

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