RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (12): 2166-2176.doi: 10.11870/cjlyzyyhj201512022

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CLIMATIC CHARACTERISTICS OF EXTREME PRECIPITATION EVENTS IN THE DADU RIVER BASIN DURING 1961-2010

LIU Jia, MA Zhen-feng, YANG Shu-qun, YANG Xiao-bo, LI Xiao-lan   

  1. Climate Center of Sichuan Province, Chengdu 610071, China
  • Received:2014-06-20 Revised:2014-08-07 Online:2015-12-20

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Abstract: In recent years, with the increase of extreme precipitation events in high-latitude Northern Hemisphere land, the average intensity and frequency of extreme precipitation and in China are also on the rise. Dadu River is the largest tributary of the Minjiang River. Because of their topography, lithology, structure, slope structure, avalanches, landslides and other disasters occur frequently. Variation in precipitation extremes in the Dadu River basin from 1960-2009 were analyzed based on daily precipitation data from 17 meteorological stations within and adjacent to the Basin. This paper used a recently developed interpolator, the greens line, based on the application of green's functions of the biharmonic operator.The interpolated surface is constructed by globally summing the weighted Green's functions centered at every data point. Moreover, the methods of linear regression, Mann-Kendall test and continuous wavelet transform were employed to delineate the rate of change, abrupt change points, statistical significance of the trends, and periodicity of extreme precipitation indices. The results showed inter-annual variations of the extreme precipitation index in Dadu River showed relatively stable volatility increases. The distribution of annual average showed an increased trend from the northwest to southeast, and there were significant regional differences in the trend of extreme precipitation index. Extreme precipitation indices showed a trend of reducing in upstream and increasing in downstream, with exception of the heavy precipitation days. The extreme precipitation indices were closely associated with annual total precipitation in the basin. The abrupt change point of each extreme precipitation index in the Dadu River basin was inconsistent. Abrupt change points of RX1 day, RX5 day were at 1974-1976, and 1978, and R25, R95 and R95 day were at 1984, 1979, 1977, and increased after abrupt changes. The cyclying characteristics of extreme precipitation indexes is more complex, we conclude that most extreme precipitation indices in the Dadu River basin existed two common oscillation cycles, 5-10 years and 20-25 years(major cycle).

Key words: extreme precipitation events, abrupt change, oscillation cycle, climate change, Dadu River basin

CLC Number: 

  • P467
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