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Hydro-acoustic precursors of gravity waves generated by surface pressure disturbances localised in space and time

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journal contribution
posted on 26.03.2015, 17:12 by Emiliano RenziEmiliano Renzi, F. Dias
We consider the mechanics of coupled underwater-acoustic and surface-gravity waves generated by surface pressure disturbances in a slightly compressible fluid. We show that pressure changes on the ocean surface, localised in space and time, can induce appreciable underwater compression waves which are precursors of the surface gravity waves. Although the physical properties of acoustic-gravity waves have already been discussed in the literature, such dynamics was not investigated in previous studies. We derive new results for the underwater compression wave field and discuss the dynamics of its generation and propagation. This work could lead to the design of innovative alert systems for coastal flooding management.

Funding

The work of E.R. is funded by the AXA Research Grant ‘Underwater acoustic sensing for detection, early warning and increased risk awareness of storm surges with application to Ireland’. F.D. is supported by the ERC-2011-AdG 290562 – MULTIWAVE.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

JOURNAL OF FLUID MECHANICS

Volume

754

Pages

250 - 262 (13)

Citation

RENZI, E. and DIAS, F., 2014. Hydro-acoustic precursors of gravity waves generated by surface pressure disturbances localised in space and time. Journal of Fluid Mechanics, 754, pp. 250 - 262.

Publisher

© Cambridge University Press

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

This article was published in the Journal of Fluid Mechanics [© Cambridge University Press]. The definitive version is available at: http://dx.doi.org/10.1017/jfm.2014.398

ISSN

0022-1120

Language

en

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