The transient layer of permafrost of the Eastern Chukotka coastal plains, NE Russia

Maslakov, A.A.; Egorov, E.G.; Zelensky, G.M.; Vasil’chuk, Y.K.; Budantseva, N.A.

Авторы: Maslakov Alexey A., Egorov Evgeny G., Zelensky Gennady M., Vasil’chuk Yuri K., Budantseva Nadine A.
Сборник: Proceedings of the 26th International Conference on Port and Ocean Engineering under Arctic Conditions, POAC
Год издания: 2021
Первая страница: 1
Последняя страница: 8
Номер статьи: 049
Аннотация: The paper presents the results of field and laboratory studies of permafrost transient layer characteristics within key study polygon of Eastern Chukotka coastal plains. The transient layer underlies the active layer and is characterized by an increased ice content, which determines its protective characteristics under conditions of short-period fluctuations in air temperature. Transient layer plays key role in thermokarst and thermal erosion, which are one of the most widespread dangerous processes for engineering facilities and infrastructure in the Arctic. Within the key area, the relief and Quaternary sediments were studied, surficial drilling was conducted, and the isotopic composition of the ice exposed in the boreholes was analyzed. As a result, variations in the transient layer thickness, its cryolithological structure, and the composition of stable oxygen isotopes were determined. Depending on thegeomorphological conditions and lithological composition of the sediments, the transientlayer thickness reaches 1.2 meters, while its gravimetric moisture content varies within widerange: from 70-150% in loamy sediments to over 1000% in peat. The stable oxygen isotopescomposition (δ18O) in the transient layer is identical for all cores and varies from –11.4 to –14.0‰ that may be considered as diagnostic feature of this object in further studies.
Добавил в систему: Маслаков Алексей Алексеевич

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The transient layer of permafrost of the Eastern Chukotka coastal plains, NE Russiaстатья

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