长江流域资源与环境 >> 2021, Vol. 30 >> Issue (7): 1649-1658.doi: 10.11870/cjlyzyyhj202107012

• 生态环境 • 上一篇    下一篇

汉江流域1961~2018年多尺度气象干旱时空演变特征

汪  琳1,2,舒章康1,2,王国庆1,2* ,彭  涛3,4,林青霞 3,4,周  俊5   

  1. (1. 南京水利科学研究院,江苏 南京 210029;2. 水利部应对气候变化中心,江苏 南京 210029;3.  三峡大学水利与环境学院,湖北 宜昌 443004;4. 水资源安全保障湖北省协同创新中心,湖北 武汉 430072;5.中国科学院国家空间科学中心,北京 100000)
  • 出版日期:2021-07-20 发布日期:2021-08-03

Spatial and Temporal Evolution of Multi-Scale Meteorological Drought in Hanjiang River Basin from 1961 to 2018

WANG Lin 1,2, SHU Zhang-kang 1,2, WANG Guo-qin 1,2, PENG Tao 3,4, LIN Qin-xia 3,4, ZHOU Jun 5   

  1. (1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute, Nanjing 210029, China; 2. Research Center for Climate Change, Ministry of Water Resources, Nanjing 210029, China; 3. College of Hydraulic and Environmental Engineering,Three Gorges University,Yichang 443004,China; 4. Hubei Provincial Collaborative Innovation Center for Water Resources Security,Wuhan 430072,China; 5.National Space Science Center, CAS, Bengjing 100000, China)
  • Online:2021-07-20 Published:2021-08-03

摘要: 干旱是一种最常见的自然灾害,随着人类活动和气候变化的加剧,干旱事件的发生愈发频繁,对人类的生产生活产生了巨大影响。基于1961~2018年汉江流域0.25°×0.25°格点降水资料,选用标准化降水指数(SPI)定量分析了汉江流域的月尺度、季尺度、年尺度气象干旱的干旱趋势、干旱频率及干旱强度,揭示了汉江流域气象干旱发生的时空演变特征。结果表明:(1)SPI值能较好的反映汉江流域气象干旱变化特征,随着时间尺度的增加,SPI值波动幅度减小,稳定性增强。月、季、年尺度SPI序列的突变年份分别为1980、1988、1994年,季尺度和年尺度SPI序列分别表现出2和4年的显著周期性特征。(2)汉江流域自20世纪90年代以来呈现中部地区干旱化、东部和西部地区湿润化的趋势,干旱发生频率总体呈上升趋势,干旱强度呈现中部高,东西低的特征。其中丹江口水库附近区域和唐白河下游段呈显著干旱化趋势,丹江口以上区域干旱频率最高,干旱强度最大,轻旱、中旱事件频发。(3)各地区的季节性气象干旱特征具有一定差异性。丹江口以下地区秋旱趋势最显著,唐白河地区夏旱发生频率最高,且以轻旱、中旱事件为主,丹江口以上地区秋旱强度最高。

Abstract: Drought is one of the most commonly occurred natural disasters. With the intensification of human activities and climate change, the production and life of human being have been highly influenced by the frequently occurred drought events. Based on the grid precipitation data with resolution of 0.25°×0.25° in the Hanjiang River Basin from 1961 to 2018, the process, frequency and intensity of meteorological droughts were analyzed at monthly, seasonal, and annual scales by using the standardized precipitation index (SPI). The characteristics of the spatial and temporal evolution of meteorological droughts in the Hanjiang River Basin were then comprehensively investigated. Results indicate that: (1) The SPI value can better reflect the characteristics of meteorological drought variation in the Hanjiang River Basin. With increase in time scale, the magnitude of SPI fluctuation tends to decreases and the stability accordingly increases. The abrupt change points of the meteorological droughts at monthly, seasonal, and annual scale occurred at 1980 and 1988, and 1994, respectively. The significant periodicity of 2 and 4 years were detectable in seasonal and annual meteorological droughts. (2) Since the 1990s, the central region of the Hanjiang River Basin presented an aridification trend while the eastern and the western regions exhibited a humidification trend. For the whole catchment, the frequency of droughts tends to increase in general, with the higher drought intensity occurring in the central region and the lower occurring in the east and west regions. The lower reaches of the Tangbaihe River and the area nearby the Danjiangkou Reservoir showed a significant aridification trend. Meanwhile, the area above the Danjiangkou Reservoir could be characterized with the highest drought frequency and intensity, as well as the more frequently occurring for the light and moderate drought events. (3) The seasonal meteorological droughts are different for different regions. For instance, the area below Danjiangkou reservoir has the most significant trend of autumn drought, the summer droughts are usually in the levels of light drought or moderate drought with a relatively higher frequency, and mainly manifesting in the Tangbaihe area. The autumn drought tends to increase with a higher intensity, mainly occurs in the area above the Danjiangkou reservoir.

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