Reducing of negative consequences and adaptation to climate changes for highland of Great Altai
Bayan Olgii, Mongolia, 19-20 December 2018
In the face of Climate warming, most glaciers of Altai Mountains have been retreating, resulting in an increase in the number and size of dammed lakes are generated by moraines after the retreat of glaciers which block the drainage of rivers. The failure of naturally dammed lakes is the source of the largest floods in Earth’s history; they exceed precipitation caused events by magnitudes. Natural dams consist of glacier ice, moraines, landslide deposits and block the drainage of rivers to lakes of variable size and duration. The failure of the dams can release large amounts of accumulated water abruptly by outburst floods without prior warning. Due to the current global retreat of most mountain glaciers it might be expected, that the number of outburst floods related to the failure of naturally dammed lakes could even increase. Disastrous mudflows generated by GLOFs are a frequent phenomenon in the Altai region. Single events are described, while systematic investigations, spatial differentiations and assessment of hazardous lake are missing for most part.