Remote-ground monitoring of oil-contaminated lands of the Nefteyugansk region of Khanty-Mansi Autonomous Okrug
M.N. Alekseeva, D.V. Fedorov, I.V. Russkikh, I.G. Yashchenko
Institute of Petroleum Chemistry of the Siberian Branch of the RAS, Tomsk, Russia
Keywords: oil spills, oil-contaminated lands, vegetation map, NDVI, satellite imagery, IR spectrometry
Abstract
An approach which combines remote and ground-based methods for monitoring oil-contaminated soil and vegetation cover is suggested. A map is presented that reflects the natural and anthropogenic structure of the territory of the Nefteyugansk region of the Khanty-Mansiysk Autonomous Okrug in the conditions of oil and gas production. The legend of the map shows 10 natural and 3 anthropogenic types of vegetation cover and the open surface of the Earth in the area located in the Salym-Ob flat terraced swamp-taiga landscape province. It was revealed that after oil spills, the soil and vegetation cover experiences a long-term negative impact. The NDVI values in the oil-contaminated areas are 0.1-0.3 lower than in the background ones. In satellite imagery in days close to those of ground-based surveys, the NDVI of oil-contaminated areas of sedge-sphagnum bogs is 0.45 (8.08.2020) and 0.42 (23.08.2021), respectively. In small-leaved and light-coniferous forests on sites with a negative impact of fresh oil spills, NDVI = 0.32 (25.09.2020) and 0.42 (23.08.2021), respectively. The concentration of oil products in contaminated soil samples lies in the range 280-580 g/kg, exceeding the approximately permissible concentrations by 70-145 times.
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