THE ANTHROPOGENIC FACTOR OF EXTREME MANIFESTATION OF FLUVIAL PROCESSES IN THE VALLEY OF THE BOL’SHAYA BELAYA RIVER IN 2019 (IRKUTSK OBLAST)
M.Yu. OPEKUNOVA
V.B. Sochava Institute of Geography, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, ul. Ulan-Batorskaya, 1, Russia
opek@mail.ru
Keywords: Upper Angara region, morphodynamical types of channels, channel plane deformations, dynamics of floodplain-channel complexes, erosion-accumulation processes, extreme floods, dirt roads
Abstract
This paper considers the characteristics of the occurrence of erosion-accumulation processes at the passage of the 2019 disastrous floods on the rivers of the Angara river basin in Irkutsk oblast (using the Bol’shaya Belaya river as an example). Field investigations were made within the program of monitoring the dynamics and development of floodplain-channel complexes and coastal deformations on the rivers of the Upper Angara region. It is pointed out that the existence of line facilities of the infra structure (roads) within the floodplain massifs often triggered an enhancement in the flow velocities, an increase in the volumes of transported material as well as the formation of accumulative landforms which can subsequently prevent the water exchange between channel and floodplain flows and serve as an additional factor for the occurrence of negative processes for humans which can involve destruction to the facilities of economic activity, or do a substantial damage to them.
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