Link for citation:  Savichev O.G.,  Guseva N.V., Khvashchevskaya A.A., Ivanov A.Yu., Yang Heng,   Zhou Dan. Experiment for estimating self-cleaning of the Obskoe fen (Western Siberia, Tomsk region). Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2022, vol. 333, no. 1, рр. 73-84. In Rus.

Relevance. The flat area of Western Siberia is very swampy. Therefore economic activities are frequently carried out on swamps and the swampy grounds that defines the necessity of researches of the swamp environment self-cleaning for reduction in negative anthropogenous influence on an environment and optimization of economic activities. The aim of the research is experimental studying of conditions of distribution in the swamp environment of polluting substances and self-cleaning of eutrophic fen. Methods: field experiment, methods of definition of a chemical composition of peat and water, statistical methods. Results and conclusions. Authors have drilled 5 boreholes and have selected samples of fen waters in active horizon of a peat deposit and peat through 0,25 m on the Obskoe fen (the south of Tomsk region) in area of settlement Nashchekovo on 18 March 2021. Four boreholes are located as tops of a square with the side 100 m. The dump of 50 litres of NaCl solution with concentration of 20 g/dm³ is executed in the middle of a square on a fen surface on 19.03.2021. Repeated drilling and sampling of marsh waters and peats are carried out on 16 October 2021. It is shown that during this period directly in a place of release of NaCl solution in an interval of depths of 1,50–2,00 m relative increased concentration of Na⁺ (up to 11,5 mg/dm³) and Cl^– (up to 22,4 mg/dm³) were generated. In other boreholes (on distance about 70 m from release) significant changes of values of рН, specific electric conductivity EC, Na⁺ and Cl^– concentration in fen waters and water extracts from the peats, associated with release of NaCl solution, are not revealed. It testifies to high ability of fen ecological system to self-cleaning.