Regionalization of the Ob–Irtysh Basin According to the Conditions of Riverbanks Erosion
https://doi.org/10.31857/S2587556623020061
Abstract
The article analyzes the patterns of riverbanks erosion of medium and large rivers of the Ob-Irtysh rivers’ basin. They have a real and potential threat. The territory in different parts differs in the regime of water and sediment runoff under free and relatively homogeneous free conditions of channel formation (wide floodplains composed of sandy deposits). The increase in the order of rivers, which is an indirect indicator of their water content, leads to the activation and increase in the intensity of horizontal channel deformations. The geological and geomorphological conditions of channel formation (the width of the valley bottom and the inf luence of bedrock banks), along with hydroclimatic factors, affect the rate of channel displacement and their reformation. According to the conditions of river bank erosion, seven regions are distinguished in the Ob- Irtysh basin, each of which is characterized by different intensities of channel deformations and hydrological and morphological dependences that connect their indicators (rate and length of riverbanks erosion fronts) with the channel and water content of the flow. The characteristics of bank erosion (rate and the length of the erosion front) depend on the shape of the channels, which determines the hydraulic characteristics of the flow. Riverbanks erosion rates increase with an increase in the degree of development of the meanders. The water content of the river and decreases in the branches due to the dispersal of the runoff. The washout front, ceteris paribus, is longer for flat bends. The bedrock banks recede mainly due to the development of landslides and scree, provoked by the impact of the flow on them.
Supporting agencies: The paper is prepared with financial support of the Russian Science Foundation (project no. 18-17-00086 П) and Russian Foundation of Basic Research (project no. 20-3590003/20).
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For citations:
Kurakova A.A. Regionalization of the Ob–Irtysh Basin According to the Conditions of Riverbanks Erosion. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2023;87(2):280-294. (In Russ.) https://doi.org/10.31857/S2587556623020061
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