G.A.S. Codato1 gabrielcodato@gmail.com,
W.B. Watanabe1 wandrey@ieapm.mar.mil.br,
L. Calado1 lcalado@ieapm.mar.mil.br,
N. Martins2 nmartins@ualg.pt and
A.E.A. Ramos3 aearamos05@gmail.com
1Marinha do Brasil - Instituto de Estudos do Mar Almirante Paulo Moreira — IEAPM
Rua Kioto, 253 - Praia dos Anjos, Arraial do Cabo — RJ, CEP 28930-000
2Institute for Systems and Robotics, University of Algarve
Campus de Gambelas, PT-8005-139 Faro, Portugal
3Universidade Federal do Rio Grande - FURG
Avenida Itália, km 8, Rio Grande — RS, CEP: 96200-190
Comments: download pdf file.
Ref.: X Encontro de Tecnologia em Acústica Submarina (ETAS),
Rio de Janeiro, Brasil, Novembro 2011.
Abstract
This work has evaluated the acoustic signal transmission loss in presence of the thermic gradient produced by the coastal upwelling of Cabo Frio — RJ. A hydrodynamic numerical model was used to built the thermohaline structure of the upwelling. This structure served as an input to an acoustic model and used like a base to the sound propagation. After this procedure, the acoustic signals were simulated in two different scenarios, one with the occurrence of a strong upwelling, and another with no upwelling. The result has shown that the upwelling plume acts as a barrier to the sound propagation. In the absence of upwelling, the acoustic signal could reach greater distances. Then, it's possible that the coastal upwelling can prevent the detection of submarine targets.