RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (03): 514-522.doi: 10.11870/cjlyzyyhj201603019

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TEMPORAL AND SPATIAL DISTRIBUTION CHARACTERISTICS OF METEOROLOGICAL DROUGHT FOR RECENT 52 YEARS IN DONGTING LAKE BASIN

WANG Ting1, ZHANG Xin-ping1, LI Zu-xian2, LUO Zi-dong1, LIAO Meng-si1, LIU Na1   

  1. 1. College of Resources and Environment, Hunan Normal University, Changsha 410081, China;
    2. Weather Modification Office, Hunan Metrological Bureau, Changsha 410007, China
  • Received:2015-07-03 Revised:2015-09-07 Online:2016-03-20
  • Supported by:
    National natural science foundation;the key constructiondisciplines program in Hunan province;The foundation of extreme drought mechanism research inHunan province

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Abstract: In this study, based on the daily meteorological data of 84 meteorological stations in the Dongting Lake Basin from 1962 to 2013. we employed comprehensive Meteorological drought index (CI) to analyze the temporal and spatial distribution characteristics of meteorological drought in Dongting Lake Basin during recent 52 years. In the past 52 years, the result showed that the intensity of regional drought was mainly pronounced in summer, autumn, summer to autumn, autumn to winter. Among then, the regional drought intensity tended to increase in spring, summer, summer to autumn and winter. And it decreased from spring to summer, autumn, winter to spring. In addition, the regional drought intensity was unobvious in autumn to winter and annum. This pattern showed that different seasons had different trend of regional drought intensity, the seasonal variation trend was not consistent with the annual variation trend. The average drought intensity of continuous drought was heavier than that in a single season. The continuous drought contained drought from spring to summer, drought from summer to autumn, drought from autumn to winter and drought from winter to spring. Results from the Morlet wavelet analysis showed faster oscillation period of 4 to 6 years or 9 to 11 years on regional drought intensity, they alternated remarkably from drought to wetness. The period of 9 to 11 years was present throughout all studied time period, which was stable during this period. Based on the wavelet variance figure, the regional drought intensity had quasi-periodicity of 5 years, 10 years and 22 years. Among then, the 10 years was the obviously primary period, the 5 and 22 years were the secondary periods. In the past 52 years, the number of stations which had drought is relative fewer in spring. In summer, the range of drought stations ratio total stations in the basin was mostly presenting as local drought and part of the regional drought, and it showed smaller range in this season. The range of droughty stations ratio total stations was relatively higher in autumn, and it was similar with the droughty range of summer. Winter was a season that the value of droughty stations ratio total stations would be small. It was mainly represented as drought-free. In conclusion, the range of drought stations ratio total stations of four seasons in the basin was mostly floated from 10%-30%, presenting mainly as local drought and part of the regional drought. And the range of drought was generally wider in summer and autumn. High incidence of drought frequency mainly occurred in summer, summer to autumn and autumn, which located in the south mountainous area and northeast of Basin. Drought occurred less in the northwest of Basin, the frequency of drought converted from high to low in the HengShao Basin.

Key words: Dongting Lake Basin, comprehensive Meteorological drought index, temporal and spatial variations, regional drought intensity

CLC Number: 

  • P426.616
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