CURRENT STATE OF GROUNDWATER SPRINGS OF THE MAHATTA SAND MASSIF, EASTERN SIBERIA
V.A. Palamarchuk1,2,3, L.S. Lebedeva4, N.A. Pavlova4, R.R. Khairullin1, N.E. Baishev4
1Earth Cryosphere Institute, Tyumen Scientific Centre, Siberian Branch of the Russian Academy of Sciences, Tyumen, Russia
2Arctic Research Centre of the Yamal-Nenets autonomous district, Salekhard, Russia
3Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences, Moscow, Russia
4Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia
Keywords: sand massifs of the cryolithozone, permafrost-hydrogeological conditions, aquifer taliks, groundwater springs, groundwater reserves
Abstract
A study of permafrost and groundwater conditions of the Mahatta Tukulan, Sakha Republic (Yakutia), where thick aquifer talik horizons are common, was carried out. During the first half of July 2021, the water discharge of the Mugur-Taryn Spring was 690 L/s, which is less compared to data from 1973-1974 (770-930 L/s). Current data confirm that the chemical composition of suprapermafrost and interpermafrost groundwater has been stable over the past several decades in the studied sand massifs. The chemical composition of these spring waters is calcium-magnesium bicarbonate, with mineralization of 13-50 mg/dm3. Using field observation data and results of remote sensing data processing, it was determined that the area of the sand massif with a vegetation cover has increased by approximately 18 % during the past 40-50 years. This has led to a decrease in soil temperature, a change in the water heat balance of the massif, and a reduction of water reserves of talik aquifers.
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