THE INFLUENCE OF CLIMATIC AND ANTHROPOGENIC FACTORS ON HYDROLOGICAL REGIME OF RIVERS AT THE SOUTH OF KRASNOYARSK KRAI
T. A. Burenia1, D. A. Prysov2, E. V. Fedotova1,3
1V. N. Sukachev Institute of Forest, Russian Academy of Sciences, Siberian Branch, Akademgorodok, 50/28, Krasnoyarsk, 660036 Russian Federation
2Academician M. F. Reshetnev Siberian State University of Science and Technology, Prospect Krasnoyarskiy Rabochiy, 31, Krasnoyarsk, 660014 Russian Federation
3Siberian Federal University, Prospekt Svobodny, 79, Krasnoyarsk, 660041 Russian Federation
Keywords: гидрологический режим, годовой сток, осадки, вырубки, Саянская горная область, hydrological regime, annual runoff, precipitation, deforestation, Sayan mountain region
Abstract
Despite a large number of publications covering various aspects of the influence of climatic factors on runoff, this direction in hydrological research acquires a new meaning in connection with the increase in anthropogenic pressure on river systems. In order to identify regional and local features of the hydrological regime of the rivers in Sayan mountain region, the spatial and temporal dynamics of runoff of the main rivers in the study area were analyzed; the analysis of river flow trends against the backdrop of climate change and forest management in the drain areas was performed. Studies have shown that the revealed trends in the annual runoff of the studied rivers differ in type and in magnitude. The hydrological regime of the rivers with the negative trend of annual runoff is determined by the general nature of the humidification of the territory, which overrides the influence of all other factors. Despite a general trend of decreasing precipitation, the positive trend of annual runoff is due to a decrease in evaporation in the drainage areas, which depends both on the temperature regime of the research area and on the anthropogenic transformation of forest vegetation under logging impact. In spite of the considerable variability of annual river flow, trends in runoff coefficients for study rivers vary slightly, indicating the relative stability in water availability. This is due to cumulative effect of anthropogenic transformation of forest vegetation in the drainage areas, i.e. new felling, regeneration on logging sites and creating forest crops. Obtained results show that at the regional level in conditions of anthropogenic pressure on the forests in the drainage areas of medium and small rivers, the trends of climatic parameters, in particular precipitation, are offset by the forest harvesting and subsequent reforestation dynamics at clear cuts.
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