Home – Home – Jornals – Geography and Natural Resources 2019 number 5S

This paper presents the results of geomorphological reconnaissance field studies of the effects of floods on the rivers of the Irkutsk oblast basin Angara - Iya (Angara river tributary), Olha (Irkut river tributary), as well as a number of tributaries of the lake Baikal. Were considered three sites located in different geodynamic conditions: Iya-river (Gadaley mouth-mouth Azey), Olkha, part of the tributares of lake Baikal (near the Baikalsk). The typing of channels and complexes of the studied rivers is carried out. High geodiversity of channel types within the study area was noted. The river Iya has incised, adapted, wide floodplain-channel river channel type. Olha characterized wide floodplaine with a meandering or branched- meandering type of channel with mostly segmental flat floodplain type. Tributaries of lake Baikal (Solzan, Babkha, Bezymyannaya) in the lower reaches and are characterized by a wide-floodplain, adapted branched and branched-winding types of channel, often with shore-and selezaschitnymi designs. On the basis of a combination of morphodynamic channel types the basic types, degree of interac tion of flood waters and floodplain-channel complexes on various sites are preliminary defined. It is noted that for the wide-floodplain areas the main type of interaction of the flow - floodplain-channel system was the flooding of negative forms of floodplain relief, in the areas of the adapted and embedded channel there was a complete flooding of floodplains. The most intensive, apparently, interaction of the flow and flow-floodplain-channel complexes, took place in the zones of change of the hydrodynamic regime, morphodynamic types of the channel. The types of exogenous geomorphological processes in river valleys arising or activated by the passage of the flood were determined.