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Ref.: PhD Thesis, COPPE/UFRJ, Rio de Janeiro (Brasil), May 2015
The coastal areas monitoring is an issue of great strategic, economic and social importance to any nation possessing littoral region. In the case of Brazil, this issue is extremely important, on account of great extension of its coastline, and significant variety of resources, flora, fauna and human activities existing in the waters close to Brazilian coast. In this context, the Ocean Acoustic Tomography represents one of the tools of great interest, enabling large areas monitoring of the coastal environment, with appropriate balance between resources allocated for such and the access, in real-time, to the acquired information. The Ocean Acoustic Tomography was originally designed for deep water regions, based on Ray Theory. However, tomographic methods based on Ray Theory are sometimes insufficient to shallow water regions, and alternatives have been found in the use of Matched Field Techniques and Modal Tomography. This work discusses the estimation of sound speed perturbation in a shallow water environment, from measurements of modal travel time, based on processing of data collected in the INTIMATE96 experiment, carried out in June 1996, off the coast of Portugal.