The history of the Moksha River valley development in the end of the Late Pleistocene
https://doi.org/10.31857/S043542812103007X
Abstract
Late Pleistocene reconstruction of the lower part of the Moksha River valley (between the mouth of the Tsna River and the mouth of the Moksha River) was completed using mechanical coring and radiocarbon (AMS) dating of alluvium in the river valley bottom. Results revealed that between 40–30 ka BP, the river incised deeper than the present level, due to the increase of the river runoff associated with climatic changes. Later the incision was replaced by the valley infill caused by the drying up of the climate and a lowering of the river runoff, that was more significant during the last glacial maximum (LGM, 23–20 ka BP). Sediments derived from scarcely vegetated slopes activated by cryogenic processes from drainage area caused changes of river’s longitudinal profile due to sediment accumulation. In the Late Glacial time starting from 18.5 ka BP a significant increase in river runoff led to the formation of macromeanders and widening of the valley bottom. The Holocene was characterized by a decrease in runoff and channel parameters, and narrowing of the meander belt of the river. During interglacial, sediment accumulation in the channel was negligible because of decreased sediment supply from the eroding basin.
Keywords
Late Glacial,
macromeanders (large paleochannels),
Pleistocene paleogeography,
the history of river valleys development,
fluvial geomorphology
Supporting agencies: This study is supported by Russian Science Foundation (Project № 19-17-00215 “Research and modeling of possible scenarios for the formation of extreme paleohydrological phenomena in the Caspian basin after the Last Glacial Maximum”). Field data processing was performed under the facilities of the Institute of Geography RAS, taskforce 0148-2019-0005, and the Department of Geomorphology and Paleogeography of Moscow State University, taskforce “Cenozoic evolution of the environment, the dynamics of the relief, geomorphological hazards and risks of land-use”.
About the Authors
E. Yu. Matlakhova
Lomonosov Moscow State University; Institute of Water Problems RAS
Russian Federation
Russian Federation
Faculty of Geography
Moscow
V. Yu. Ukraintsev
Institute of Water Problems RAS; Institute of Geography RAS
Russian Federation
Russian Federation
Moscow
A. V. Panin
Institute of Water Problems RAS; Institute of Geography RAS
Russian Federation
Russian Federation
Moscow
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For citations:
Matlakhova E.Yu., Ukraintsev V.Yu., Panin A.V. The history of the Moksha River valley development in the end of the Late Pleistocene. Geomorfologiya. 2021;52(3):105-115. (In Russ.) https://doi.org/10.31857/S043542812103007X
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