HYDRO-GEOLOGICAL AND HYDROLOGICAL CONDITIONS OF FUNCTIONING OF THE OBSKOE AND BAKSINSKOE FENS (THE SOUTHEAST OF THE WESTERN SIBERIAN PLAIN)

Relevance is determined by the important complex role of fens in formation of ecological condition of regions of Western Siberia, including questions of interaction between ground, river and fen waters. The aim of the research is analysis of hydro-geological and hydrological conditions of functioning of the Obskoe and Baksinskoe fens in southeast of West Siberian plain. The primary tasks are: 1) estimation of elements of water balance of fens and their basins; 2) estimation and analysis of interaction of fen, river and ground waters. Methods: statistical methods, mathematical modelling of hydro-geological and hydrological processes. Results and conclusions. The authors have carried out the quantitative estimation of elements of water balance of the Baksinskoe and Obskoe fens and their basins for 1966–2019. Intraannual distribution of infiltration in a paleogene-quaternary deposits of the Ob and Schegarka rivers watershed is determined. Reduction of evaporation from a basin surface and increase of a water flow layer occur at bogging with primary distribution of fens. It results in additional bogging territory. Interaction of surfaces and ground waters with a different degree of intensity is basically limited to depths of 110–120 m. Influence of fen waters on ground waters is probable in summer-autumnal low water. During this period the overflow of fen waters in ground horizons on sites of 800–900 m is possible and the infiltration increases. The influence of fen waters reaches its maximum during the decline of spring flood when water masses are discharged from the swampy floodplain into the river channe