Thermokarst Activity and Phenomena

Thermokarst activity is expressed geologically by lowering of the ground surface, retreat of slopes or hollowing out of the substrate. These expressions, occurring singly or in different combinations, allow us to distinguish here six fundamental modes of thermokarst activity in permafrost soils: (1) active-layer deepening, (2) ice-wedge melting, (3) thaw slumping, (4) groundwater flow, (5) shoreline thermokarst, and (6) basin thermokarst. A more complex classification of modes of permafrost degradation specific to the boreal forest is given by Jorgenson and Osterkamp (2005).

Was this article helpful?

0 0

Post a comment