Localizing sounds from ships and cetaceans with a glider equipped with a 8 hydrophones’ network : First results from a 20 day - 600 km exploration of the Western French Mediterranean Sea in 2019
Here, we report on the use of a new acoustic payload, a network of eight hydrophones mounted on a glider SEAEXPLORER to allow for a better acoustic characterization through localization of sources thanks to the array of hydrophones.
We present an innovative algorithm to estimate the bearing of cetacean calls and ship noise from the glider’ array of hydrophones. This algorithm is applied to a 20 days – 600 km exploration ran in 2019 in the Western French Mediterranean Sea. The trajectory of the glider was chosen to sample 1) the highest and lowest shipping densities and 2) the deepest and the shallowest water in the Gulf of Lion.
The results are simultaneous time series of:
- cetaceans detections (click of odontocetes), the number of individuals and their bearings,
- ships detections and their bearings,
- ambient noise level.
They are analyzed to report on the level of effects of the anthropogenic noise on odontocetes in the Western French Mediterranean Sea.