近40年松花江流域气象干旱演变特征

Evolution characteristics of meteorological drought in Songhua River Basin in recent 40 years

本文基于中国区域地面气象要素驱动数据集1979—2018年的降水数据,采用标准化降水指数为评价指标,计算松花江全流域及嫩江、松花江下游和松花江吉林段各子流域近40年各季节、年尺度干旱指数,并在此基础上利用Mann-Kendall趋势检验法分析了流域各季节的气象干旱演变特征,研究成果对松花江流域的水资源管理和生态保护具有重要理论意义和实践价值。

Based on the precipitation data of China's regional surface meteorological factor driven dataset from 1979 to 2018,this paper uses standardized precipitation index as an evaluation index to calculate the seasonal and annual drought indices of the Song⁃hua River basin and subbasins of Nenjiang River,the lower reaches of Songhua River and the Jilin section of Songhua River in recent 40 years.On this basis,the Mann-Kendall trend test method is used to analyze the characteristics of meteorological drought evolution in each season of the basin.The research results have important theoretical and practical value for water resources management and ecological protection in the Songhua River basin.