LAKE-LIKE EXTENSIONS OF THE RIVERBEDS IN THE STEPPE ZONE AND POSSIBLE CAUSES OF THEIR FORMATION (ON THE EXAMPLE OF THE URAL RIVER BASIN NEAR CITY OF ORSK)

A. M. Tarbeyeva; I. V. Krylenko; V. V. Surkov

doi:10.15356/0435-4281-2016-1-73-81

LAKE-LIKE EXTENSIONS OF THE RIVERBEDS IN THE STEPPE ZONE AND POSSIBLE CAUSES OF THEIR FORMATION (ON THE EXAMPLE OF THE URAL RIVER BASIN NEAR CITY OF ORSK)

A. M. Tarbeyeva, I. V. Krylenko, V. V. Surkov

https://doi.org/10.15356/0435-4281-2016-1-73-81

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Abstract

In the steppe zone (The Ural river basin) rounded river openings occur. These openings have signifi cant (up to 5 m) depth, occur too often and are distributed chaotically. So it is unlikely they are the remains of the former pools of the river. They are found in silted riverbeds, and in dry oxbow depressions of the incutting rivers; they are characteristic to flatter sections of their longitudinal profi le. The analysis of the morphology and distribution of the lake-like extensions allowed to put forward the hypothesis of a signifi cant role of suffusion an karst processes in their formation, aggravated by the extinction of the channels. The favorable condition for such forms generation are the reduction of water and sediment runoff. In the rivers with constant flow sink holes are quickly infi lling with alluvium.

Keywords

русловые процессы, суффозия, малые реки, степная зона

About the Authors

A. M. Tarbeyeva

Lomonosov Moscow State University
Russian Federation

I. V. Krylenko

Lomonosov Moscow State University
Russian Federation

V. V. Surkov

Lomonosov Moscow State University
Russian Federation

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Review

For citations:

Tarbeyeva A.M., Krylenko I.V., Surkov V.V. LAKE-LIKE EXTENSIONS OF THE RIVERBEDS IN THE STEPPE ZONE AND POSSIBLE CAUSES OF THEIR FORMATION (ON THE EXAMPLE OF THE URAL RIVER BASIN NEAR CITY OF ORSK). Geomorfologiya. 2016;(1):73-81. (In Russ.) https://doi.org/10.15356/0435-4281-2016-1-73-81