Natural zoning of drought in Yunnan Province based on principal component cluster analysis
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Abstract:
Research on the natural zoning of drought can reveal the law of drought occurrence and development in the study area. It can also provide theoretical basis for formulating countermeasures against drought disasters. Based on the principal component cluster analysis method, we chose the relief degree of land surface, annual average drought index, percentage of precipitation negative anomaly in low-flow years (P=75%), and variation coefficient of annual precipitation for natural zoning of drought in Yunnan province. With the ArcGis software, we plotted the natural zoning diagram of drought. Finally, single-factor analysis of variance was adopted to verify the rationality of zoning results. The results indicated that the central and eastern regions in Yunnan province are more susceptible to drought than the western regions. This finding is basically consistent with the statistical analysis results of relevant yearbooks and data. The differences among the four drought regions are remarkable, which can further verify that the natural zoning results of drought are reasonable in this paper.
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