Utkina A. O.

The Influence of Glacial Isostatic Adjustment on the River Flow of the Upper Volga during the Last Glacial Period P. 116- 129.

UDC 551.334.2:627.15(282.247.41)«625»

DOI 10.37724/RSU.2020.68.3.013

 

The likelihood of the formation of large proglacial lakes in the Upper Volga basin during the Last Glacial Period is a palaeographic issue that needs to be further investigated. Proglacial lakes are believed to have formed by the damming action of the moraine (which modern scientists consider rather doubtful) or due to postglacial rebound. The research reconstructs topographic changes of the Upper Volga basin on the basis of glacial isostatic adjustment models (ICE-5G and ICE-6G L. Peltier). The analysis of reconstructed river profiles shows that the adjustment was not sufficient to block the flow and to form large barrier lakes. Local lakes can be found in the source of the Volga River and in the Upper Volga downstream known for the glacier compensation effect resulting in the reduction of longitudinal slope. The reduction of longitudinal slope caused an intensive directed accumulation, deglaciation cutting and pre-glacial upland immersion. The used strategy can be employed to assess the influence of glacial isostatic adjustment on glacial areas. It can also be used by researchers who employ glacial isostatic adjustment models.

Valdai glaciation; Upper Volga; glacial isostatic adjustment; glacial isostatic compensation; pre-glacial upland; proglacial lakes

 

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