Marine Geophysics and Hydroacoustics

Acoustic Image Gallery

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Water column image of a massive spiral methane seep (blowout 22/4b)
Volcanic CO2 gas bubble leakage detection at Panarea (Italy)
High resolution grid of Eckernförde Bay Pockmarks. Intrapockmarks have been identified. We interpret them as indicators for active submarine groundwater discharge (SGD). Trawl marks can be identified by our acurate measurement as 4 cm deep line pattern. Sound velocity correction was partly realized with synthesized sound velocity profiles. Tidal correction was performed by courtesy of WSA. Data recorded during ALKOR 447, 2014, entire processing was done by MBSystem.
Ground mine detection using 300kHz EM2040c snippet backscatter, Baltic Sea, Kiel. In the vicinity of the mines we also found fishing and anchoring trawl marks. With SAPOS postprocessed internatial navigation system data we achieved an absolute position accuracy of ~8cm . Resolution in the snippet backscatter imagery achieved resolution of up to 5cm. Recorded during ALKOR 447, 2014.
Perspective view of methane gas blowout, EM710
Parasound image of diurnal twilight layer
Bathymetric chart of submarine volcano Hatoma, Okinawa through
High-resolution acoustic image of the water column that was recorded with a fine-tuned sonar setup (300 khZ). Note the very high resolution showing individual, rising methane gas bubbles as diagnostic line patterns from the seafloor. We also clearly see propeller wash down, fish, and a pycnocline. KONGSBERG EM2040c, recorded during ALKOR 447, 2014.
Figure shows one of the first multispectral multibeam backscatter measurements. Data show significant differences in the detected bathymetry with more than 10 m offset between EM120 (12 kHz) and EM1002 (95 kHz). With analysing the backscatter together with a subbottom profiler we could clearly map out shallow gas in the sediments in 2D. (Schneider von Deimling et al., 2013)
Bathymetry off Panarea, recorded with the mills-cross ELAC Wärtsilä Seabeam 3050 (50 kHz) multibeam echosounder on R/V POSEIDON. Data was processes with MBSystem. Water column images where recorded at the same time showing hundreds of active CO2 gas vent sites.
High resolution, RTK-guided NORBIT multibeam mapping of the lost observatory site in Eckernförde Bay, Boknis Eck. The plot is showing the "train wheels moorings" of 0.8m diameter surrounding the remaining Coastsens tower in the southeast. The observatories themself could not be found during a dedicated survey of this site.