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.
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.
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 –