| Construction of comprehensive drought index on the Loess Plateau and analysis of spatiotemporal characteristics |
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| DOI：10.7606/j.issn.1000-7601.2025.06.26 |
| Key Words: drought index CRITIC empowerment method trend analysis trip theory drought frequency Loess Plateau |
| Author Name | Affiliation | | CHENG Xi’an | School of Civil Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China | | NIU Quanfu | School of Civil Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China
Gansu Province Emergency Surveying and Mapping Engineering Research Center, Lanzhou, Gansu 730050, China
Academician Expert Workstation of Gansu Dayu Jiuzhou Space Information Technology Co., Ltd., Lanzhou,Gansu 730050, China | | WANG Gang | School of Civil Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China | | SHAO Donghu | School of Civil Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China | | ZHU Dengfeng | School of Civil Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China | | WANG Zhenyu | School of Civil Engineering, Lanzhou University of Technology, Lanzhou,Gansu 730050, China |
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| Abstract: |
| As one of the key regions in China with frequent and highly influential droughts, the Loess Plateau has a particularly significant negative impact on the ecological environment and people’s lives. This study was based on the CRITIC weighting method, which comprehensively considers meteorological and agricultural drought indicators, aiming to construct a comprehensive drought index (TVSS). Based on this, trend analysis and trip theory were combined to study and analyze the drought change trend and drought events in the Loess Plateau region. The results showed that TVSS constructed based on the CRITIC weighting method at different time scales have been confirmed to be reliable through correlation analysis, and a total of 28 comprehensive drought events have been recorded in the past 23 years. Through analyzing the characteristics of drought,??it was found that the duration, peak intensity, and total intensity of drought all showed a decreasing trend. The frequency of drought in the western part of the Loess Plateau was higher than that in the eastern part, and that in the northern part was higher than that in the southern part. The proportion of regional drought and local drought was 19.6% and 18.5%, respectively, while the frequency of regional drought and partial regional drought was relatively low, at 7.6% and 8.7%, respectively. From 2000 to 2022, the TVSS index of the Loess Plateau showed an upward trend, with the monthly change rate of 0.0004·10a-1, the seasonal change rate of 0.3·10a-1 except in winter, and the annual change rate of 0.447·10a-1, indicating that the drought situation in the region is gradually developing towards a humidifying trend. |
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