摘要
分析渝东北地区干旱规律,为当地抗旱政策制定提供理论依据。基于空间分辨率为0.1°的降水网格数据,以标准化降水指数(SPI)为基础干旱指标,计算渝东北地区1979-2015年各月干旱指数。在此基础上,进行三维干旱事件识别,并计算得到干旱的5个特征变量:干旱历时、面积、强度、烈度和干旱中心。研究发现,渝东北地区的干旱状况在上世纪80年代较轻,90年代最重,到21世纪有频率增加的趋势。经过归纳统计,渝东北地区夏旱、秋旱频发,夏秋连旱影响最大,可为以后渝东北区的抗旱工作提供科学依据。
Droughts frequently occurred in the Northeast Chongqing in recent years.Analyzing the spatial-temporal distribution characteristics is important to cope with droughts and protect natural resources.A 3-dimensional clustering method was used to identify drought events in China from 1979 to 2015 based on the 0.1°grid indices of SPI.Drought events were further characterized by five parameters:duration,affected area,intensity,severity,and centroid.The results showed that drought condition in northeast Chongqing was light in 1980s.The most severe drought conditions in Hengduan Mountains occurred in 1990s.the frequency of the drought increased in 21st century.Summer drought and autumn drought occured frequently in northeast Chongqing,and the effect of summer and autumn drought is the most serious.The results will provide the basis for future drought relief efforts.
作者
牛文娟
NIU Wen-juan(Chongqing Surveying and Design Institute of Water Resources Electric Power and Architecture,Chongqing 400020,China)
出处
《水利科技与经济》
2021年第10期1-7,共7页
Water Conservancy Science and Technology and Economy
基金
重庆市社会民生类重点研发项目(编号:No.cstc2018jscx-mszdX0052)。
关键词
标准化降水指数
干旱事件
渝东北
standardized precipitation index
drought events
Northeast Chongqing
