摘要
基于天津市13个行政区域测点1961-2010年逐月降水资料的基础上,利用不同时间尺度下的标准化降水指数SPI分析了天津市干旱变化的时空特征,并运用k-means聚类理论对天津市进行了干旱分区。研究得出天津市干旱情况逐渐严重,季节性干旱比较明显;各区县整体干旱情况类似,但发生不同等级干旱的时间不太相同;并将天津市分为6个干旱特征类似的地区,为分区域研究干旱特征提供了基础。
By using 1961-2010 monthly precipitation data from 13 stations in Tianjin,the Standardized Precipitation Index（SPI） of different time scales was used to analyze the spatial and temporal variability of drought.The study area was divided into different regions according to the K-means clustering methods.The results show that the drought condition in Tianjin is more serious than ever before with obvious seasonal drought,each station has similar drought condition but the occurrence of different drought levels is different and Tianjin was divided into six different regions by similar features which would provide a foundation for sub-regional study in the future.
出处
《灾害学》
CSCD
北大核心
2013年第2期40-45,共6页
Journal of Catastrophology
基金
国家自然科学基金(51179117)
关键词
干旱
标准化降水指数SPI
时空变化
干旱分区
K-MEANS聚类
drought
Standardized Precipitation Index（SPI）
spatial and temporal variability
sub-regional
K-means cluster
