Scientific apparatus

The Doppler current meters (ADCP) were replaced by latest-generation equipment, bringing the vessel up to standard for physical oceanography campaigns. The Thalassa is now fitted with the same hardware as that on board the Atalante and the Pourquoi pas? with a similar installation beneath the hull, and the same frequencies (38 kHz and 150 kHz). Acceptance of the 38 kHz ADCP did not take place during the July trials. Additional investigations and trials were conducted in the last quarter to validate the system and make it operational. A 333 kHz base was added to the frequency range for the EK60 single beam fishfinder. A full-scale geometry study was also performed to locate all the scientific apparatus precisely with respect to a reference position. Finally, a noise measurement campaign was conducted adjacent to all the sensors, allowing the performance of the multibeam fishery echosounder in bathymetric mode to be improved.