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| DOI： |
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| Drought Partition and Agricultural Drought Risk Zoning in Yunnan Province |
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CHANG Wenjuan， LIANG Zhongmin， LI Yan， DUAN Qicai
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College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China; Hubei Provincial Collaborative Innovation Center for Water Resources Security, Wuhan 430072, China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China; Nantong Hexin Engineering Survey and Design Institute Corporation Limited, Nantong 226000, China; Yunnan Research Institute of Water Resources and Hydropower, Kunming 650021, China
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| Abstract: |
| The method of drought partition and agricultural drought risk zoning were investigated, and Yunnan province was selected as a pilot to apply the presented methods. Firstly, three indicators, including topographical features index , average years of drought indices and negative anomaly percentage of 75% guarantee rate at annual level, were selected as the drought partition index, then the principal component analysis method was applied to describe drought natural partition of Yunnan province. While, drought partition consequent was used as the one of drought risk zoning index, synthetically considering drought risk hazard, fragility and vulnerability factors as the common constitutions of agricultural drought risk zoning index system. Moreover, multi-level fuzzy comprehensive evaluation results were employed to synthetic agricultural drought risk zoning of Yunnan province. The results showed that the northeast of Yunnan province was the drought prone areas, which was more prone to drought than that of the southwest and belonged to the drought light-prone areas or less-prone areas. The northeast of Yunnan province was the high drought risk area, however，the northwest was the low drought risk area. The above consequences were basically consistent with the actual drought situation of Yunnan province. These showed that drought natural partition based on principal component method and drought risk zoning by the elements in the practical application had certain feasibility and practicability. |
| Key words: drought partition；Principal Component Analysis；agricultural drought risk zoning；fuzzy comprehensive evaluation; ArcGIS |
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