长江流域资源与环境 >> 2021, Vol. 30 >> Issue (3): 712-720.doi: 10.11870/cjlyzyyhj202103018

• 自然灾害 • 上一篇    下一篇

1960~2017年汉江流域气象干旱时空特征分析

冉鹏羽,赵强*,熊丹,姚天   

  1. (济南大学水利与环境学院,山东 济南 250022)
  • 出版日期:2021-03-20 发布日期:2021-04-07

Spatial and Temporal Characteristics of Meteorological Drought in the Hanjiang River Basin from 1960 to 2017

RAN Peng-yu,ZHAO Qiang,XIONG Dan,YAO Tian   

  1. (School of Water Conservancy and Environment,University of Jinan,Jinan 250022,China)
  • Online:2021-03-20 Published:2021-04-07

摘要: 基于汉江流域13个站点1960~2017年的逐月降水和平均气温资料,计算不同时间尺度下的标准化降水蒸散指数(SPEI),分析汉江流域气象干旱时空特征,并结合大气环流指数讨论该流域气象干旱成因。结果表明:(1)汉江流域SPEI数值具有3~4年的主周期,表现出干湿交替的状态。(2)年尺度下,轻旱和中旱发生频率在5%~24%,且西部地区较高。春季,多轻旱和中旱发生且频率在6%~19%;夏季,轻旱频率中部高于四周,最高地区频率在20%~28%;秋季,中部地区干旱频率较高;冬季干旱频率普遍高于10%但以轻旱和中旱为主。(3)年尺度下,汉江流域SPEI值以0.0021/a的速度降低,说明全球变暖对流域年际干旱情况影响很小;春季和秋季SPEI值与MEI、SOI显著相关,相关系数绝对值在0.271~0.422之间;夏季SPEI值与EASM显著相关,相关系数绝对值在0.261~0.498之间;冬季SPEI值与AO、NAO显著相关,相关系数绝对值在0.220~0.281之间。

Abstract: Based on monthly precipitation and average temperature data from 13 stations in the Hanjiang River Basin from 1960 to 2017, this paper calculated the standardized precipitation evapotranspiration index (SPEI) at different time scales, analyzed the temporal and spatial characteristics of meteorological drought in the Hanjiang River Basin, and discussed the causes of meteorological drought in the basin in combination with the atmospheric circulation index. The results show that: (1) The Han River Basin SPEI value has a main period of 3-4a, showing a state of alternating wet and dry. (2) On an annual scale, the frequency of light and middling droughts ranges from 5% to 24%, and is higher in the western regions. In spring, light and moderate droughts occur with a frequency of 6% -19%; in summer, the frequency of light drought is higher in the middle than the surroundings, and the highest frequency is 20%-28%; in autumn, the frequency of drought in the central region is high; in winter, the frequency of drought is generally higher than 10%, but it is mainly light and moderate. (3) On an annual scale, the SPEI value of the Han River Basin decreased at a rate of 0.0021/a, indicating that global warming has little effect on interannual drought conditions in the basin.SPEI values in spring and autumn are significantly correlated with MEI and SOI, and the absolute value of the correlation coefficient is between 0.271-0.422; the SPEI value in summer was significantly correlated with EASM, and the absolute value of the correlation coefficient was between 0.261-0.498; the SPEI value in winter was significantly correlated with AO, NAO, and the absolute value of the correlation coefficient was between 0.220-0.281.

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