Active Layer and Permafrost Investigations Using Geophysical and Geocryological Methods—A Case Study of the Khanovey Area, Near Vorkuta, in the NE European Russian Arctic

Rossi, M.; Cin, M.D.; Picotti, S.; Gei, D.; Isaev, V.S.; Pogorelov, A.V.; Gorshkov, E.I.; Sergeev, D.O.; Kotov, P.I.; Giorgi, M.; Rainone, M.L.

Авторы: Rossi Mara, Cin Michela Dal, Picotti Stefano, Gei Davide, Isaev Vladislav S., Pogorelov Andrey V., Gorshkov Eugene I., Sergeev Dmitrii O., Kotov Pavel I., Giorgi Massimo, Rainone Mario L.
Журнал: FRONTIERS IN EARTH SCIENCE
Том: 10
Год издания: 2022
Издательство: Frontiers Media S.A.
Местоположение издательства: Lausanne, Switzerland
Первая страница: 1
Последняя страница: 22
Номер статьи: 910078
DOI: 10.3389/feart.2022.910078
Аннотация: Permafrost in the NE European Russian Arctic is suffering from some of the highestdegradation rates in the world. The rising mean annual air temperature causes warmingpermafrost, the increase in the active layer thickness (ALT), and the reduction of thepermafrost extent. These phenomena represent a serious risk for infrastructures andhuman activities. ALT characterization is important to estimate the degree of permafrostdegradation. We used a multidisciplinary approach to investigate the ALT distribution in theKhanovey railway station area (close to Vorkuta, Arctic Russia), where thaw subsidenceleads to railroad vertical deformations up to 2.5 cm/year. Geocryological surveys, includingvegetation analysis and underground temperature measurements, together with the fasterand less invasive electrical resistivity tomography (ERT) geophysical method, were used toinvestigate the frozen/unfrozen ground settings between the railroad and the VorkutaRiver. Borehole stratigraphy and landscape microzonation indicated a massive prevalenceof clay and silty clay sediments at shallow depths in this area. The complex refractive indexmethod (CRIM) was used to integrate and quantitatively validate the results. The dataanalysis showed landscape heterogeneity and maximum ALT and permafrost thicknessvalues of about 7 and 50 m, respectively. The active layer was characterized by resistivityvalues ranging from about 30 to 100 Ωm, whereas the underlying permafrost resistivityexceeded 200 Ωm, up to a maximum of about 10 kΩm. In the active layer, there was acoexistence of frozen and unfrozen unconsolidated sediments, where the ice contentestimated using the CRIM ranged from about 0.3 – 0.4 to 0.9. Moreover, the transitionzone between the active layer base and the permafrost table, whose resistivity valuesranged from 100 to 200 Ωm for this kind of sediments, showed ice contents ranging from0.9 to 1.0. Taliks were present in some depressions of the study area, characterized byminimum resistivity values lower than 10 Ωm. This thermokarst activity was more activeclose to the railroad because of the absence of insulating vegetation. This study contributes to better understanding of the spatial variability of cryological conditions, andthe result is helpful in addressing engineering solutions for the stability of the railway.
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Active Layer and Permafrost Investigations Using Geophysical and Geocryological Methods—A Case Study of the Khanovey Area, Near Vorkuta, in the NE European Russian Arcticстатья

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