Features of the floodplain formation of the Oka River in its middle reaches: the case study of the “Spasskoe” local widening
https://doi.org/10.31857/S0435428120030050
Abstract
Floodplain widening “Spasskoe” includes a portion of the Oka floodplain and its two tributaries, the Istya and Pronya rivers, with a total area of about 120 km2. The floodplain in this part of the Oka valley was formed within a depression that was occupied by a lake about 30 thousand years ago and filled with lacustrine-alluvial sands that were preserved within the remnants of the first terrace above the floodplain. Overlaying floodplain alluvial facies with a thickness of 3.5 to 5.5 m occurred intermittently during the colder climate phases since the end of the Atlantic period of the Holocene to the present time. In relatively warm phases, floodplain sedimentation ceased due to the decrease of floods, and soil formation took place. 14C-dates, which record the stages of surface stabilization in periods from 400 to 3500 years ago were obtained for three buried soils. Formation of different generations of floodplain segments with levee-hollow to leveled topography occurred in the Subboreal and Subatlantic periods of the Holocene.
About the Authors
V. A. Krivtsov
Yesenin Ryazan State University
Russian Federation
Ryazan
Russian Federation
Ryazan
A. Yu. Vorobyov
Yesenin Ryazan State University
Russian Federation
Ryazan
Russian Federation
Ryazan
A. V. Vodorezov
Yesenin Ryazan State University
Russian Federation
Ryazan
Russian Federation
Ryazan
E. P. Zazovskaya
Institute of Geography, RAS
Russian Federation
Moscow
Russian Federation
Moscow
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Review
For citations:
Krivtsov V.A., Vorobyov A.Yu., Vodorezov A.V., Zazovskaya E.P. Features of the floodplain formation of the Oka River in its middle reaches: the case study of the “Spasskoe” local widening. Geomorfologiya. 2020;(3):56-71. (In Russ.) https://doi.org/10.31857/S0435428120030050
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