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Arid Land Geography ›› 2024, Vol. 47 ›› Issue (10): 1628-1639.doi: 10.12118/j.issn.1000-6060.2024.178

• The Third Xinjiang Scientific Expedition • Previous Articles     Next Articles

Changes in glacial lakes on the northern slope of Kunlun Mountains and assessment of their outburst risks

CHEN Man1(), CHEN Yaning2(), FANG Gonghuan2, LI Yupeng2, SUN Huilan1   

  1. 1. College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, Xinjiang, China
    2. State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
  • Received:2024-03-18 Revised:2024-05-08 Online:2024-10-25 Published:2024-11-27
  • Contact: CHEN Yaning E-mail:107622022210545@stu.xjnu.edu.cn;chenyn@ms.xjb.ac.cn

Abstract:

The exploration of spatiotemporal changes in glacial lakes on the northern slope of Kunlun Mountains and the risk assessment of glacier lake outburst floods (GLOF) are of great significance for regional water resource security and ecological development. Using the Google Earth Engine (GEE) remote sensing platform, this study analyzed changes in glacial lakes on the northern slope of Kunlun Mountains over the past 30 years and applied a GLOF risk assessment model to evaluate current moraine lakes for disaster risk. The results indicate the following: (1) From 1990 to 2023, the number and area of glacial lakes on the northern slope of Kunlun Mountains increased significantly. By 2023, the number of glacial lakes had risen to 925, marking a 2.73-fold increase from 248 in 1990. Similarly, the area of glacial lakes expanded to 54.83 km2, a 2.66-fold increase from 14.99 km2 in 1990. This growth was particularly notable in the high-altitude mountainous regions of the western part of the northern slope. (2) The 2023 GLOF risk assessment indicates that the Yarkant River Basin poses the highest disaster risk, accounting for approximately 47.2% of the assessed area, followed by the Hotan River Basin at 15.7%. In terms of risk levels, the Yarkant River Basin shows a relatively high-risk, accounting for about 50.8%, and high-risk glacial lakes in the Yarkant River Basin glacial lakes account for 60.7% of the high-risk glacial lakes on the entire northern slope of the Kunlun Mountains. (3) The increasing trend in glacial lakes from 1990 to 2023 is closely related to regional climate change. Rising temperatures have led to increased precipitation in mountainous areas and accelerated the melting of glaciers and snow, which are the primary drivers of glacial lake expansion. The GLOF risk assessment contributes to the sustainable management of water resources in arid regions and provides a scientific basis for disaster prevention and early warning systems in downstream areas.

Key words: glacial lakes, outburst flood disaster, risk assessment, northern slope of Kunlun Mountains