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Arid Land Geography ›› 2026, Vol. 49 ›› Issue (3): 508-520.doi: 10.12118/j.issn.1000-6060.2025.407

• Climatology and Hydrology • Previous Articles     Next Articles

Assessment of glacial lake outburst flood susceptibility in the Poiqu River Basin under climate change

XU Shuai(), SU Peidong(), QIU Peng   

  1. Department of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China
  • Received:2025-07-15 Revised:2025-10-08 Online:2026-03-25 Published:2026-03-24
  • Contact: XU Shuai E-mail:yedongzhi1972@163.com;spdong@126.com

Abstract:

Due to global warming, regional glacier retreat has become significant, and the consequent expansion and outburst of glacial lakes seriously threaten public safety and property. The factors affecting glacial lake outbursts are numerous and interact in complex ways, making their prediction challenging. Using glacial lakes in the Poiqu River Basin in the semi-arid region of Xizang in China as an example, the key indicators of glacial lake outbursts were identified using statistical analysis, and the outburst susceptibility was predicted using coupled model intercomparison project phase 6 data (CMIP6). The main conclusions are as follows: (1) In 2024, there were a total of 143 glacial lakes in the Poiqu River Basin, approximately 50% of which decreased in area, and approximately 29% increased in area, the latter being mainly moraine-dammed lakes. (2) Regional glacial lake outburst susceptibility evaluation models were established based on multilayer perceptron (MLP), support vector machine (SVM), and extreme gradient boosting (XGB) models with significant differences, with evaluation accuracy ranging from 67% to 79%. (3) The black kite algorithm (BKA) was introduced to train and generate base models, including BKA-MLP, BKA-SVM, and BKA-XGBoost, and their predictions were used as the training set for the meta model, which was then optimized to establish a stacking model. After optimization, the accuracy of the traditional machine learning models improved to 79%-82%, and the stacking model’s accuracy increased to 83.03% with an area under the curve of 0.84. (4) The stacking model’s susceptibility prediction indicates that under different models and scenarios, the probability of glacial lake outbursts shows a fluctuating upward trend, and highly susceptible glacial lakes are concentrated in Chongduipu, Keyapu, Rujiapu, and the Zhangzangbu Gully. The results of this research provide a scientific basis for predicting glacial lake outburst disasters caused by climate change.

Key words: natural disasters, glacial lake outburstflood, susceptibility, CMIP6, Poiqu River Basin