[关键词]
[摘要]
干旱自然分区能揭示研究区干旱的发生发展规律,为制定抗旱防灾减灾对策提供理论依据。基于主成分聚类分析法,选用地形起伏度、多年平均干旱指数、P75%年降水量负距平百分率和年降水变差系数四个指标对云南省进行干旱自然分区,并使用ArcGis软件绘制相应的干旱自然分区图,最后采用单因素方差分析法检验分区结果的合理性。结果表明:云南省中东部地区比西部地区更容易发生干旱,这与相关年鉴资料的统计分析结果基本一致;四个干旱自然分区之间差异显著,进一步证实了本文干旱自然分区结果具有一定的合理性。
[Key word]
[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.
[中图分类号]
[基金项目]
国家科技支撑计划课题(2013BAB06B01);江苏省普通高校研究生科研创新计划基金(CXZZ12_0240)