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Internal tide impact measured by an acoustic tomography experiment

Y. Stephan, X. Demoulin stephan@shom.fr and demoulin@shom.fr
CMO - Service Hidrographique et Oceanographique de la Marine,
F-29275 Brest Cedex, France.
S.M. Jesus sjesus@ualg.pt
SiPLAB-FCT, Universidade do Algarve
PT-8000 Faro, Portugal
E. Ferreira Coelho oceanografia@hidrografico.pt
Instituto Hidrografico
PT-1000 Lisboa, Portugal
M.B. Porter porter@mpl.ucsd.edu
Dept. of Mathematical Sciences, NJIT,
Newark, NJ, USA.

Comments: download pdf file .
Ref.: in Journal of Acoustical Society of America, Hawaii (USA), vol.100, No.4, Pt.2, p.2613, December 1996.

Abstract : The INTIMATE (INternal Tide Impact Measured by Acoustic Tomography Experiment) project is devoted to the study of internal tides using acoustic tomography schemes. The first exploratory experiment was carried out in June 96 on the continental shelf off the coast of Portugal using a towed broadband acoustic source  (500-800 Hz) and a 4-hydrophone vertical array . Acoustic data were collected for 5 days, including legs where the source ship was moving and legs with the ship on station. Intensive environmental surveys (XBT, CDT, bottom and hull-mounted ADCP, thermistor chain, bathymetry, geoacoustic surveys) were also conducted. The purpose of this presentation is to give preliminary results of acoustic data processing and to evaluate the impact of internal tides  on the acoustic propagation in a shallow water environment. Future work will deal with inversions in terms of sound speed and geoacoustic parameter estimation [Work supported by SHOM-IH-UAL. The hydrophones array was provided by the SACLANT Undersea research Center, La Spezia, Italy.]

ACKNOWLEDGMENT: this work was partially supported by the EU project MAS2-CT920022.