Flooding(or breaching)of inter-connected proglacial lakes by cascading overflow in the arid region of Western Mongolia(Mt.Tsambagarav,Mongolian Altai)  

作　　者：Otgonbayar DEMBEREL Chinmay DASH Battsetseg DUGERSUREN Munkhbat BAYARMAA Yeong Bae SEONG Elora CHAKRABORTY Batsuren DORJSUREN Atul SINGH Nemekhbayar GANHUYAG 

机构地区：[1]Laboratory of Altai Mountain Cryosphere,Climate Change and Disaster Research,Department of Geography of Western Regional Branch,National University of Mongolia,Khovd 164300,Mongolia [2]Bio-Clim-Land Center of Excellence,Tomsk State University,Tomsk 634050,Russia [3]Department of Geography Education,Korea University,Seoul 02842,Korea [4]Centre for the Study of Regional Development(CSRD),Jawaharlal Nehru University,New Delhi 110067,India [5]Laboratory of Air and Environmental Monitoring,Department of Environment and Forest Engineering,School of Engineering and Technology,National University of Mongolia,Ulaanbaatar 210646,Mongolia [6]Department of Hydrology,Geology and Geography Faculty,Tomsk State University,Tomsk 634050,Russia [7]Department of Geology,North Eastern Hill University,Meghalaya 793022,India

出　　处：《Journal of Mountain Science》2024年第10期3215-3233,共19页山地科学学报（英文）

基　　金：funded by the National University of Mongolia under grant agreement P2023(grant number P2023-4578)。

摘　　要：This study investigates the glacial lake outburst flood(GLOF)hazards in the Tsambagarav mountain range in Western Mongolia,focusing on the Khukhnuruu Valley and its interconnected proglacial lakes.Over the last 30 years,significant glacier retreats,driven by rising temperatures and changing precipitation patterns,have led to the formation and expansion of several proglacial lakes.Fieldwork combined with satellite data and meteorological analysis was used to assess the dynamics of glacier and lake area changes,with particular focus on the flood events of July 2021.The research reveals a substantial reduction in glacier area,particularly in the Khukhnuruu E complex,where glacier area decreased by 19.3%.The study highlights the influence of increasing temperatures and summer precipitation,which have accelerated ice melt,contributing to the expansion and eventual breaching of lakes.Additionally,lake area changes were influenced by the steepness of the terrain,with steeper slopes exacerbating peak discharge during floods.Of the studied seven lakes(Lake 1 to Lake 7),Lake 1 experienced the most dramatic reduction,with a decrease in area by 73.51%and volume by 84.84%,followed by Lake 7.This study underscores the region's vulnerability to climate-induced hazards and stresses the need for a comprehensive early warning system and disaster preparedness measures to mitigate future risks.

关 键 词：Glacial lake outburst flood(GLOF) Mongolian Altai Climate change Proglacial lakes 

分 类 号：P343.63[天文地球—水文科学] TV122.4[天文地球—地球物理学]