Dynamics of riverbed evolution in the middle Ural River and natural management risks
https://doi.org/10.1134/S2587556618050126
Abstract
Data on the shifts of riverbeds in the Ural River basin were obtained based on the analysis of remote sensing data (Landsat, 1985–2015) and archival data. The stages of development of free bends and riverbed, the degree of their completeness for rivers with different hydrological regime and conditions of formation of runoff in catchments (Ural and Sakmara) are marked. It was revealed that the peculiarities of riverbed transformation in wide floodplain conditions are mainly due to runoff values during the spring flood. It is noted that the dynamics of riverbed evolution processes in general is reduced due to a decrease in the share of spring flow as a result of macroregional climatically determined trends and regulation of runoff by reservoirs. The most actively developing elements of the riverbed are the peaks of free bends, the rates of spatial displacement of which range from 3–5 m to 11 m per year. The main reasons for the current risks of destruction of economic facilities located in the immediate vicinity of the coastal ledges are due to insufficient account of riverbed activity during the development of the region. The location of part of the state Russian-Kazakhstan border along the Ural and Ilek rivers in conditions of constant riverbed transformations causes the emergence of disputed territories.
About the Authors
V. M. Pavleichik
Institute of Steppe, Ural Branch
Russian Federation
Orenburg
Russian Federation
Orenburg
Zh. T. Sivokhip
Institute of Steppe, Ural Branch
Russian Federation
Orenburg
Russian Federation
Orenburg
Yu. A. Padalko
Institute of Steppe, Ural Branch
Russian Federation
Orenburg
Russian Federation
Orenburg
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- Quantitative assessment of the intensity of channel transformations for rivers with different water regimes.
- The determining factor of channel transformations is the value of spring runoff, especially for the rivers with high spring flood waves.
- Reduction in spring floods due to climate change and runoff control.
- Risks for river settlements and transport infrastructure and risks of territorial claims in border area.
Review
For citations:
Pavleichik V.M., Sivokhip Zh.T., Padalko Yu.A. Dynamics of riverbed evolution in the middle Ural River and natural management risks. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2018;(5):37-45. (In Russ.) https://doi.org/10.1134/S2587556618050126
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