Numerical simulations of wavefields generated by UXO counter-mining: study of the transition from shallow to deep water
Résumé
Explosive devices from World War II are discovered almost every week on the French coasts and they must be destroyed by the French Navy Mine Warfare Office. The consequences of the counter-mining on the marine environment are complex to evaluate. In a previous work, we focus on the impact of the seismoacoustic waves generated by such explosions on the infrastructures located on the coast and illustrate the importance of interface waves in this context. In this presentation, we address a different perspective of this problem and analyze the wavefields generated by the counter-mining of unexploded ordnances towards deep waters. For this purpose, we performed several numerical simulations using 2D time-domain spectral-element software which allows for accurate handling of the characteristics of the complex marine environment (complex bathymetry and elastic sediments). We will focus on the role of the steep transition from shallow to deep water which takes place in the area where the counter-mining is triggered and on the influence of a thin sedimentary layer on the generated wavefields.
Domaines
Acoustique [physics.class-ph]
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Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification