1. Data on the distribution of glacial lakes in the Russian, Mongolian and Chinese Altai and their dynamics during the post-Little Ice Age maximum have been obtained using geo-information mapping.
Spatial boundaries of the Upper Akkol Lake and thermokarst reservoirs of the terminal moraine complex of the Sofiyskiy Glacier. (a) in 1952; (b) in 1966; (c) in 2012; (d) d in 2020. The red arrow shows the location of the presumed lake outburst.
Flood zone near the village of Chagan-Uzun and valley of the ChaganUzun at maximum flood discharge
4. The potential economic damage to the population in the valley below was calculated using flood modelling. The value of the total damage amounted to 700000000 roubles.
5. A plan to gradually reduce the level of Upper Akkol Lake has been developed in collaboration with local authorities and the national government. Engineering work will begin in the new fiscal year (March 2024).
6. Until the threat is removed, the Watch Group of local people has been formed to monitor the status of Upper Akkol Lake.