CATASTROPHIC ICE-STONE INERTIAL GAS-DYNAMIC AVALANCHE-TYPE STREAMS AS AN OCCURRENCE OF PAROXYSMAL AIR-BLAST DIRECTIONAL GAS-DYNAMIC SURGES OF GLACIERS. ABOUT CORRELATION OF THE CONCEPTS «AVALANCHE-TYPE STREAM» AND «MUDFLOW»

Abstract

The features of catastrophic glacial avalanche-type streams are considered in the article. A special type of these streams is singled out. The features of origination and motion of such streams point at the fact that they are the evidence of paroxysmal air-blast directional gas-dynamic surges of glaciers. The mechanism and extraordinary parameters of motion kinematics of these streams are explained. Accordingly a mudflow version of the Kolka catastrophe of 2002 in its epicentral and adjoining zone including the motion zone of glacial avalanche-type stream is unreasonable and false what confirms unsuccessful efforts of hydraulic modelling of this catastrophe. It is shown that such streams are referred to the slope-gravity phenomena and are either ordinary no special type of such phenomena.