Sub-bottom profiler model 3100P with Towfish SB-216S

On board r/v Oceanograf there is a sub-bottom profiler (SBP) model 3100P with TowFish SB-216S by EdgeTech. This device operates in the 2-16 kHz frequency range (chirp type). The towed fish is fitted with transducers and hydrophones mounted under an acoustic baffle inside the unit. Sediment penetration using the SB-216S ranges from about 6 m for coarse sands and gravels to about 80m for acoustically soft sediments (e.g. mud). The beam width ranges from 17° to 24° depending on the selected operating frequency range (17°: 2 – 15 kHz, 20°: 2 – 12 kHz, 24°: 2 – 10 kHz ). Depending on the operating mode, the device collects data with a vertical resolution of 6 to 10 cm. The maximum depth at which the SBP can operate is 300 m.

The device is used in conjunction with other supporting devices: GPS RTK, gyro, USBL and works based on the Discover (EdgeTech) software.
A sub-bottom profiler is a hydroacoustic device used in shallow seismic surveys. The SBP is used for mapping of seabed structures, including: i) geological recognition of the bottom sediments that build the seabed; ii) search for sand deposits - determination of the thickness of the sand bed and the extension of its layers; iii) recognition of ground conditions for the construction of hydro-technical structures; iv) planning of routes of benthic pipelines and cables.
https://www.edgetech.com/wp-content/uploads/2019/07/0004802_Rev_F.pdf