Bed deformations of the Middle Ob River

Studying fluvial processes of the Middle Ob river is important for applied and scientific purposes. A 130km-long section of the Ob from the mouth of the Chulym river to Kolpashevo town was chosen for study. The major purposes of this research are: the analysis of fluvial processes; the classification of types of fluvial processes in the given part of the river; the analysis of dynamics and values of spatial deformations of the river bed. These problems were solved on the basis of the analysis of map data. The method of overlapping of maps relating to different periods of time was applied. Pilot charts (1900, 1929 and 1986), the topographical map of scale 1:25000 (1965), space pictures (2001) were used. Five types of fluvial processes were distinguished at the study site. The scheme of their location (arrangement) is presented. For the 58km section from Tiskino to Kolpashevo town quantity indicators for different types of fluvial processes and spatial deformations of river banks were defined. 8 bends were allocated. The overlapping of maps allowed establishing the speed of the change of the river bed and the quantity indicators of river banks deformations. The plans of changes of these indicators are presented.

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