The spatio-temporal distribution of snowmelt floods and disaster risk assessment in the Northwest China

Abstract

Snowmelt runoff is an important component of water resources in the Northwest China (NWC). With global climate warming and the increasing frequency of extreme events, snowmelt floods have caused significant damage. However, current studies lack comprehensive research and systematic risk assessments of snowmelt floods across the NWC. Based on the snowmelt runoff simulated by GLDAS-NOAH model (1948–2022), the multiple indicators of snowmelt floods were retrieved by Peaks Over Threshold (POT) model in the NWC, and comprehensive risk assessment was conducted by integrating socio-economic data. The results indicated that the snowmelt runoff in the NWC shows a significant increasing trend and exhibits a spatial pattern of being more abundant in the northwest and southwest edges while less in the central and eastern regions. In Northern Xinjiang, snowmelt floods occurred relatively infrequently but with large magnitudes, while around the Qilian Mountains, snowmelt floods were more frequent but of smaller magnitudes. The longest duration of snowmelt floods was observed in the Kashgar and Yarkant River. Basins near mountainous areas are prone to snowmelt floods, especially the Tongtian and Lancang River basins, as well as the Ebinur Lake, Ili River basin, and the rivers south of the Altai Mountains, which face the highest risk of snowmelt floods. Based on comprehensive assessment of hazard, exposure, vulnerability and adaptability, high and very high-risk areas account for 15.5 % of the NWC. It is urgent to enhance monitoring, early warning systems, and implement corresponding disaster prevention and mitigation measures in large mountainous basins.

Keywords

Snowmelt flood / Risk assessment models / Climate change / Hydrological simulations / Spatiotemporal distribution / Extreme events

CRediT authorship contribution statement

Xi Zhang: Conceptualization, Methodology, Formal analysis, Investigation, Visualization, Writing – original draft. Min Xu: Conceptualization, Methodology, Resources, Formal analysis, Supervision, Writing – review & editing. Shichang Kang: Funding acquisition, Supervision, Writing – review & editing. Haidong Han: Funding acquisition, Writing – review & editing. Hao Wu: Writing – review & editing.

Declaration of competing interests

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgements

This study was supported by China-Pakistan joint program of the Chinese Academy of Sciences (Grant No. 046GJHZ2023069MI), National Natural Science Foundation of China (Grant No. 42371145), and the program of the Key Laboratory of Cryospheric Science and Frozen Soil Engineering, CAS (Grant No. CSFSE-ZZ-2402).

Data Availability

Data will be made available on request.

Supplementary materials

Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.geosus.2024.100261.

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