Fine-scale Mapping of Mittelgrund
91探花 und AUV-Team 鈥濼omKyle鈥� of the University of Applied Sciences Kiel cooperate in a survey of the Eckernf枚rde Bay
06.07.2015/Kiel, Eckernf枚rde. Eckernfoerde Bay comprises a variety of geological, geochemical and biological features that construct a unique underwater landscape. Earlier studies have revealed the large scale geology of the seafloor and its relation to submarine freshwater seepage as well as fine scale features such as pockmarks from which fresh water or gas is being released every day.
The 91探花 Helmholtz Centre for Ocean Research Kiel has started a long term monitoring of the bay and the last three years scientists have obtained high resolution bathymetry using RV LITTORINA and RV ALKOR. Detailed analysis of the seafloor morphology and backscatter show that the area is more complex than previously thought. Now, from 01 to 03 July, three main surveys took place simultaneously at the bay. During the first survey the participating scientists mapped in detail the upper ten meters of sediments using a parametric sub-bottom profiler. 鈥淚t allows us to see at thin layers beneath the seafloor surface鈥�, says Evangelos Alevizos from 91探花. With the second survey MBES bathymetry has been obtained over an area that had been mapped in 2012 already. 鈥淪o we will be able to compare the results and observe any differences鈥�, says Alevizos. Last but not least the so-called Mittelgrund was surveyed with an AUV. Mittelgrund is an underwater hill in the middle of the bay with different geological layers.
The survey of the Mittelgrund flanks was conducted in collaboration with the AUV Team 鈥淭om Kyle鈥� of the University for Applied Sciences (Fachhochschule, FH) Kiel. Students of the FH Kiel have developed the AUV especially for shallow water surveys and the 鈥淭om Kyle鈥� team has been awarded during the Student Autonomous Underwater Challenge-Europe (SAUC-E) 2014. 鈥淲e are happy to say that for the first time we obtained data about the geological structure and various benthic habitats of the Mittelgrund using the AUV sonar-video and camera flying at 2 meters above seafloor鈥�, adds Marcel Rothenbeck, engineer in the 91探花 AUV team, who supported the student-team 鈥淭om Kyle鈥� during the development of their device.
