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Numerical study of meteotsunamis driven by atmospheric gravity waves in coastal waters of Buenos Aires Province, Argentina
Natural Hazards ( IF 3.7 ) Pub Date : 2021-01-05 , DOI: 10.1007/s11069-020-04485-9
Iael Perez , Walter Dragani

The generation and propagation of meteorological tsunamis (meteotsunamis) were numerically investigated in coastal waters of Buenos Aires Province. This study was carried out using a vertically integrated ocean model driven by a theoretical atmospheric forcing. This forcing simulates a train of nondispersive atmospheric gravity waves (AGW) propagating within a bounded area that moves at the speed of the synoptic systems. Firstly, a study case of simultaneous AGW and meteotsunami activity was simulated to validate the implemented methodology. Subsequently, after several numerical experiments, it was obtained that the amplitude, the dominant period, and the direction of propagation of the AGW train were the parameters that have the largest impact on the simulated meteotsunami amplitude. Maximum meteotsunami wave height (0.85 m) was obtained at Punta Rasa (the northern extreme of the coast of Buenos Aires Province) when the AGW reached this location. Numerical outcomes also showed that the meteotsunamis would propagate like ocean edge waves. In these cases, the continuous transference of energy from the atmosphere to the ocean could be possible (Greenspan resonance). Even though the implemented theoretical forcing is realistic, the numerical experiments revealed that some particular issues should be enhanced to better simulate the genesis and propagation of the meteotsunamis in coastal waters of the Buenos Aires Province. These issues are analyzed and discussed in this paper.



中文翻译:

大气重力波驱动的阿根廷布宜诺斯艾利斯省沿海海域海啸的数值研究

在布宜诺斯艾利斯省的沿海水域,对海啸的发生和传播进行了数值研究。这项研究是使用由理论大气强迫驱动的垂直整合海洋模型进行的。这种强迫作用模拟了在有限区域内传播的一系列非分散大气重力波(AGW),该区域以天气系统的速度运动。首先,模拟了同时进行的AGW和流星海啸活动的研究案例,以验证所实施的方法。随后,经过几次数值实验,发现AGW列车的振幅,主导周期和传播方向是对模拟的海啸波幅影响最大的参数。流星海浪最大波高(0。当AGW到达此地点时,在蓬塔拉沙(布宜诺斯艾利斯省海岸的北部极端)获得了85 m)。数值结果还表明,海啸将像海浪一样传播。在这些情况下,能量从大气层到海洋的连续转移是可能的(格林斯潘共振)。尽管实施的理论强迫是现实的,但数值实验表明,应增强某些特殊问题,以便更好地模拟布宜诺斯艾利斯省沿海水域海啸的发生和传播。本文对这些问题进行了分析和讨论。在这些情况下,能量从大气层到海洋的连续转移是可能的(格林斯潘共振)。尽管实施的理论强迫是现实的,但数值实验表明,应增强某些特殊问题,以便更好地模拟布宜诺斯艾利斯省沿海水域海啸的发生和传播。本文对这些问题进行了分析和讨论。在这些情况下,能量从大气层到海洋的连续转移是可能的(格林斯潘共振)。尽管实施的理论强迫是现实的,但数值实验表明,应增强某些特殊问题,以便更好地模拟布宜诺斯艾利斯省沿海水域海啸的发生和传播。本文对这些问题进行了分析和讨论。

更新日期:2021-01-05
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