Abstract
The seabed topography of the Velikaya Salma Strait of Kandalaksha Gulf, White Sea, was studied using multibeam echo sounding, side-scan sonar surveys, seismoacoustic profiling, geological sampling, and survey from remote-operated underwater vehicles. A digital elevation model of the seabed with a grid cell of 2 m, slope angle map and exposure map were created. Structural-denudation, glacial, gravity, and tidal-current of meso- and microrelief forms were identified on the seabed of the strait. An approach to large-scale geomorphological mapping was proposed, based on identification of morphogenetic complexes: regular combinations of meso- and microrelief forms typical of glaciated shelves. The boundaries of morphogenetic complexes are repeat by the methods for automated analysis of morphometric parameters calculated using TIN models. This approach can be used for landscape and engineering-geological mapping, including identification areas of geological hazards.
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Notes
A fjard is a narrow bay protruding deeply into the land with low rocky shores, often composed of ancient crystalline rocks. Unlike fjords surrounded by high rocky shores, fjards are located within a low-hilly, flattened relief [6]. Structural features of fjords, fjards, and fjard–shaped straits are considered in detail in [6, 26, etc.].
A DEM is a certain representation of the initial data and method of their structural description, which makes it possible to calculate (reconstruct) the values of the function defining the surface in a given area via interpolation [20].
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ACKNOWLEDGMENTS
The authors would like to thank the teams of CMI LMSU, CASD LMSU, and SPLIT for collecting field materials and assistance in processing and interpreting the data, and to WBS MSU for research support.
Funding
The research is part of a project funded by Arctic Science Center LLC. Generalization of the data was partially supported by the Ministry of Education and Science of the Russian Federation (topic nos. AAAA-A20-120080690051-4, 121040100323-5) and the Russian Foundation for Basic Research (project no. 19-05-00966).
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Repkina, T.Y., Rybalko, A.E., Terekhina, Y.E. et al. Experience of Large-Scale Geomorphological Mapping of Glaciated Shelves Using Geophysical Data (Velikaya Salma Strait, Kandalaksha Gulf of the White Sea). Oceanology 62, 390–403 (2022). https://doi.org/10.1134/S0001437022030080
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DOI: https://doi.org/10.1134/S0001437022030080