Home – Home – Jornals – Geography and Natural Resources 2019 number 3

A new view of the morphogenesis stages in the Kel’tma hollow for the Valdai Glacial Period is presented. The main method of studying the hydrographic network elements which give direct or indirect evidence of its reconfiguration in the Pre-Holocene period involved satellite image interpretation and morphological analysis of large-scale cartographic material as well as constructing topographic profiles and digital elevation models. Results from studying the landscape pattern of the southern (Kama) part of the Kel’tma hollow and adjacent drainage areas suggest that on its surface there are features of fluvial morpho-dynamics whose formation might be associated precisely with the streams flowing from outside the contemporary basin of the Southern Kel’tma. This is indirectly evidenced by the parameters, configuration and geomorphological position of these forms relative to the modern hydrographic network. In the absence of evidence confirming the absolute age of the ancient valleys, runoff hollows and palaeochannels, it was possible to determine the stadial sequence of their formation having regard to the geomorphological structure as well as some characteristic properties of the planned-high-altitude position of fluvial landforms in relation to each other, to wetlands and aeolian landforms. Single stages of lake terrace modeling in the Late Pleistocene are identified. The manifestation of the very first (initial) modeling stage of the lake terrace is provided by the formation of the ancient valley extended south-westward. The second stage includes a large terrace hollow and microhollows. The third modeling stage refers to the time of formation of incised macromeanders which are currently the home for narrow and, often, undeveloped floodplains of the Southern Kel’tma and Timsher, and their main tributaries.