ON THE ORIGIN OF BEADED RIVER CHANNELS SHAPE IN THE PERMAFROST ZONE ON THE ORIGIN OF BEADED RIVER CHANNELS SHAPE IN THE PERMAFROST ZONE
https://doi.org/10.7868/S043542811801008X
Abstract
Channels with regularly spaced elliptical pools connected by narrow runs, called beaded streams, are widespread in permafrost regions and are considered a result of ice-wedge polygons degradation. Other hypothesis said that such forms are caused by freezing up of alluvial depositional forms in the channel. However no detailed study of the origin of beaded channels in permafrost regions was conducted yet. In this study we combined existing hypotheses of the origin of beaded channels in the permafrost regions with data of their morphology, distribution and permafrost conditions beneath the riverbeds. It was revealed that beaded channels in permafrost regions are not a sign of permafrost and ice-wedge network degradation, because ice-wedge polygons in the floodplain are secondary. They are polygenetic landforms formed by thermokarst, selective thermoerosion due to uneven freezing and thawing of sediments in the pools and runs and also fluvial and ice processes. The role of each of these factors depends on the local conditions of channel formation. A special type of small river channels – beaded meandering channels – was identified, which are remnants of unconfined meandering process and sign of decrease of the fluvial process activity. Transformation from meandering to beaded channel could be caused by reduce of water runoff and permafrost aggradation in the floodplain. Detailed analysis of causes and age of this transformation can be used for paleoclimatic and paleohydrological reconstructions in permafrost regions.
Supporting agencies: RFBR, projects No. 14-05-00549 and No. 17-05-01287
About the Author
A. M. Tarbeeva
Lomonosov Moscow State University
Russian Federation
Russian Federation
Faculty of Geography
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For citations:
Tarbeeva A.M. ON THE ORIGIN OF BEADED RIVER CHANNELS SHAPE IN THE PERMAFROST ZONE ON THE ORIGIN OF BEADED RIVER CHANNELS SHAPE IN THE PERMAFROST ZONE. Geomorfologiya. 2018;(1):88-95. (In Russ.) https://doi.org/10.7868/S043542811801008X
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