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Ref.: in ICA'19, Aachen (Germany), September 2019 (invited).
Abstract:
Coastal upwelling is an oceanographic phenomenon that challenges the understanding of
acoustic propagation, especially when it extends to shallow water areas with complex
geographic configuration. The data used in this paper was collected in a semi-enclosed
bay filled by the upwelling stream through an inlet off the island of Cabo Frio, in the
coast of Brazil. The experiment was carried out in January 2019, under BIOCOM, a joint
initiative between the Brazilian Navy and the University of Algarve (Portugal).
Broadband acoustic signals were transmitted over a 1.6 Km-long transect across the
upwelling flow during five days. These signals were superimposed in a soundscape formed
by a strong biological acoustic signature and boat engine noise due to close by recreation
boats. Signals were received in two hydrophone arrays: one vertical and another horizontal,
close to the bottom. The comparison of received data with that generated with a 3D acoustic
propagation model shows good prospects for water column properties inversion. The ability
to track temperature changes of the highly dynamic system formed by the conjunction of the
upwelling stream, the tide and the wind, allows for improving the performance of vertical
line arrays for other tasks such as source detection and localization.
ACKNOWLEDGMENT: This work was funded under project BIOCOM, from CsF (Brazil).