8 Sept ’21
SONARCTIC: Mission accomplished
Expert Dominik Palgan inspects the NORBIT multibeam before installation.
Polarquest2021: Save the White was a 20-day scientific expedition around the Svalbard archipelago, logging 1300 nautical miles. One of its key missions was “SONARCTIC” – using an underwater sonar to study explored areas of the archipelago.
On 16 August 2021, the Polarquest2021 expedition successfully completed its seafloor mapping programme, with its last sonar scanning station in Bockfjorden at 79°5N, 13°4E.
The crew was directed by sonar specialist Dominik Pałgan, and assisted by scientific coordinator Gianluca Casagrande, support engineer Kevin Monneron and environmental science student Elias Meier. They began their research activity upon leaving Ny Alesund, Svalbard, on 8 August 2021, immediately deploying a NORBIT Subsea iWBM 200 kHz multibeam echosounder from the sailing boat Best Explorer. The multibeam was installed on the right side of the stern platform with its GPS antennas placed on an A-frame above the navigation cockpit. The arrangement proved to be perfectly integrated with the vessel’s structure and internal systems.
Hoisting the NORBIT banner while scanning the seafloor.
The arrangement was developed by shore-team scientific advisor Dr. Aleksandra Kruss (NORBIT and Gdansk University), skipper Giovanni Acquarone and technical coordinator Michael Struik.
The multibeam sensor was used to conduct two different types of expeditive surveys: a route scanning during transits along the western and north-western area of Spitsbergen and Nordaustlandet, and a systematic survey of an uncharted area northwest of Lady Franklinfjorden, Nordaustlandet, down to a distance of approximately 300 metres from glacier Søre Franklinbreen front, beyond the 80th parallel.
The activity allowed the team to produce new data in partially charted or completely uncharted regions of the archipelago, identifying potential corridors for navigation several points of very shallow waters. These will be publicly reported to update navigation charts. The scarce availability of such detailed data in the area appeared evident as single depth measurement indicated on nautical maps were often shown by the sonar to correspond to relatively wide and complex morphological structures on the seafloor (e.g. plateaus).
Dominik and Gianluca monitor data collection with the NORBIT sonar.
Observations in the Lady Franklinfjorden yielded new detailed data about the features of the sea floor in a previously virtually unknown site and will provide valuable information about the evolution of the local environment with regards to glaciers and their dynamics. Initial results show multiple rows of moraines (up to few meters high “ridges”) oriented parallel to the glacier front, indicating the position of the glacier front in the geological past. Several lineaments engraved in the outcrops of the bedrock have also been mapped, which are probably associated with an advancing glacier, showing how powerful ice can really be.
The mapping activity confirms the suitability of small vessels to perform seafloor mapping tasks in shallow seas and particularly in close proximity to coasts, which would prove extremely challenging for larger research vessels.
Throughout the survey process, the NORBIT equipment proved consistently reliable and flexible, with no system-related inconvenience throughout the programme. Particularly during transit mapping, it often outperformed expectations in terms of scanning speed, operating at nominal survey and bottom detection capabilities up to 6.5 knots SoG in good sea/weather conditions. The sensor also turned out to show operational robustness in relatively rough sea conditions for long periods.
Kevin and Gianluca aboard Best Explorer.
Dominik and Gianluca monitoring data gathered by the sonar.
About the expedition
The Polarquest 2021 expedition was carried out aboard Best Explorer, a record-breaking sailboat. It was the second to ever circumnavigate the Arctic in a clockwise direction and the first Italian sailboat to sail the Northwest and Northeast passage.
For the 2021 expedition, Polarquest association partnered with BlanX as part of its Save the Arctic White campaign. Blanx shares our ethos: promoting the value of scientific research and ensuring the protection of the Arctic.
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