Catastrophe ; Changement global ; Coin de glace ; Eurasie ; Jakutija ; Modèle ; Pergélisol ; Réchauffement climatique ; Variation climatique ; Zone froide
Catastrophe ; Climatic variation ; Climatic warming ; Cold area ; Eurasia ; Global change ; Ice wedge ; Model ; Permafrost ; Yakutia
Since models of global warming predict that climatic changes will be greatest in the Arctic and might already be in progress, it is prudent to attempt to understand the rapidly changing thermal regime on Eurasian cold regions. In this paper
the A. tries to evaluate the probable catastrophic implications of global climatic change in the cold regions of Eurasia. The impact on Man activities in permafrost regions is discussed.
Recent climatic change and catastrophic geomorphic processes in mountain environments
Avalanche ; British Columbia ; Canada ; Catastrophe ; Changement global ; Coulée boueuse ; Déglaciation ; Montagne ; Mouvement de masse ; Réchauffement climatique
Avalanche ; British Columbia ; Canada ; Catastrophe ; Climatic warming ; Debris flow ; Deglaciation ; Global change ; Mass movement ; Mountain
Many times human perceptions of geomorphic hazards are fallacious. Three types of misperceptions are 1) a perception of stability, which leads to the conclusion that any change is not natural, 2) a perception of instability, which leads
to the conclusion that change will not cease, and 3) a perception of excessive response, which leads to the conclusion that changes will always be major. Examples, which include the Snake, Ohio, Colorado, and Nile Rivers, incised channels, and Rocky Mountain Streams
the actual aspect of a landscape corresponds to the instantaneous dynamic equilibrium between them. Extremely small accidental pertubations can cause the system to become unstable, leading to rapid changes in the landscape which are experienced as hazard