摘要
利用辽西北地区1971—2010年40个雨量站点降水资料,修正并验证Z指数干旱等级,并基于修正后Z指数,采用小波分析法和克里金空间插值法分析辽西北地区干旱时空特性。结果表明,修正后Z指数适合辽西北地区。时间上,辽西北地区干旱发生频率呈上升趋势,旱涝周期交替发生,存在8年左右的主周期。空间上,不同等级干旱频次的等值线梯度均较小,空间分布比较均匀;辽西北地区干旱高发区主要集中于朝阳市。
Based on rainfall data in 40 rainfall stations from 1971 to 2010 in northwest of Liaoning, grade of Z-index was adjusted and verified. Temporal and spatial characteristics of droughts in northwest of Liaoning were analyzed by wavelet analysis and kriging spatial interpolation method on the basis of adjusted grade of Z-index. The results showed that adjusted grade of Z-index could be used in the northwest of Li- aoning. Drought frequency increased in recent years, and there was eight years of primary cycle in north- west Liaoning. At the same time, the gradient of isoline under different grades of drought was small, dis- tribution in spatial was uniform, and the drought mainly appeared in Chaoyang.
出处
《灌溉排水学报》
CSCD
北大核心
2013年第5期133-136,共4页
Journal of Irrigation and Drainage
基金
水利部公益性行业科研专项(201101061)
水利部科技推广项目(TG1203)
关键词
干旱
Z指数
等级修正
时空特性
辽西北
drought
Z-index
grade adjustment
spatial and temporal characteristics
northwest of Liaoning
