Ocean noise field-calibration constraints for deep sea mining

de Oliveira Júnior, Luciano; Rodríguez, Orlando; Jesus, Sergio

http://hdl.handle.net/10400.1/26480

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Authors

de Oliveira Júnior, Luciano

Rodríguez, Orlando

Jesus, Sergio

Abstract(s)

The EU Horizon project TRIDENT aims at developing a comprehensive study to improve the understanding of the activities related to deep sea mining as well as to develop observation methodologies, technologies required for impact forecast, and possible mitigation measures. In the framework of TRIDENT, the impact of the acoustic field will be assessed by deploying a fixed array of acoustic recorders in the surrounding of the mining activity on top of the Tropic Seamount to monitor the near field, while acoustic gliders equipped with hydrophones will provide the observations from the far field. In complement, noise models will be routinely used for predicting sound distribution requiring frequent calibration with field data with a suitable spatial coverage. This work proposes a methodology and tests the calibration capabilities for ocean noise modelling in the context of DSM activities, where the main objective is to define the best sampling strategy for a glider to record data for calibrating acoustic propagation models. The analysis of the broadband transmission loss from contrasting oceanographic conditions allowed the identification of regions of interest assuring the best use of the acoustic glider in the upcoming sea trial.