Journal of Geographical Sciences

, Volume 17, Issue 1, pp 33–42 | Cite as

Changing features of extreme precipitation in the Yangtze River basin during 1961–2002

  • Zhang Zengxin 
  • Zhang Qiang 
  • Jiang Tong 
Article

Abstract

The total precipitation of the highest 1 day, 3 day, 5 day and 7 day precipitation amount (R1D, R3D, R5D and R7D) in the Yangtze River basin was analyzed with the help of linear trend analysis and continuous wavelet transform method. The research results indicated that: 1) Spatial distribution of R1D is similar in comparison with that of R3D, R5D and R7D. The Jialingjiang and Hanjiang river basins are dominated by decreasing trend, which is significant at >95% confidence level in Jialingjiang River basin and insignificant at >95% confidence level in Hanjiang River basin. The southern part of the Yangtze River basin and the western part of the upper Yangtze River basin are dominated by significant increasing trend of R1D extreme precipitation at >95% confidence level. 2) As for the R3D, R5D and R7D, the western part of the upper Yangtze River basin is dominated by significant increasing trend at >95% confidence level. The eastern part of the upper Yangtze River basin is dominated by decreasing trend, but is insignificant at >95% confidence level. The middle and lower Yangtze River basin is dominated by increasing trend, but insignificant at >95% confidence level. 3) The frequency and intensity of extreme precipitation events are intensified over time. Precipitation anomalies indicated that the southeastern part, southern part and southwestern part of the Yangtze River basin are dominated by positive extreme precipitation anomalies between 1993–2002 and 1961–1992. The research results of this text indicate that the occurrence probability of flash flood is higher in the western part of the upper Yangtze River basin and the middle and lower Yangtze River basin, esp. in the southwestern and southeastern parts of the Yangtze River basin.

Keywords

extreme precipitation event linear trend continuous wavelet transform Yangtze River basin 

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Copyright information

© Science in China Press 2007

Authors and Affiliations

  • Zhang Zengxin 
    • 1
    • 2
    • 3
  • Zhang Qiang 
    • 2
    • 3
  • Jiang Tong 
    • 2
    • 3
  1. 1.Jiangsu Key Laboratory of Forestry Ecological EngineeringNanjing Forestry UniversityNanjingChina
  2. 2.Nanjing Institute of Geography and LimnologyCASNanjingChina
  3. 3.Laboratory for Climate StudiesChina Meteorological AdministrationBeijingChina

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