Towed sub-bottom profiler Pesk-Avel
Pesk-Avel (Breton for “surface fish”) is a towed sub-bottom profiler for undertaking acquisitions on the continental shelf (depth range 20–200 m).
This system is integrated into a towfish which can be deployed from coastal vessels.
All the sub-bottom profilers are compatible and supported by the SUBOP data acquisition system.
Pesk-Avel is used mainly for the following tasks:
- Studying sedimentation in estuaries and coastal areas, and the evolution of sedimentary systems.
- Acoustic profiling of sedimentary environments.
- Mapping sediments.
- Studying benthic ecosystems and characterizing habitats.
Pesk-Avel operates near the surface, at a depth of less than 1 m in calm conditions and at about 2.5 m below the surface in rough waters, and at a speed of 5–6 knots. Depending on the wake generated by the boat, it operates at a distance of between 30 m (Thalia) and 70 m (L’Europe) from the stern.
The towfish is fitted with a mini attitude control unit and a pressure sensor. It is deployed using an electric winch and a 100 m electromechanical cable.