Theoretical and Applied Climatology

, Volume 114, Issue 1–2, pp 61–71 | Cite as

Trends and fluctuations of rainfall regime in the Brahmaputra and Barak basins of Assam, India

  • R. L. Deka
  • C. Mahanta
  • H. Pathak
  • K. K. Nath
  • S. Das
Original Paper


The historical rainfall data of 110 years (1901–2010) of the two neighbouring basins of Brahmaputra and Barak of Assam, Northeast India were analyzed for monthly, seasonal and annual trends. The Mann–Kendall test and Sen’s slope model were used to identify the trends and estimate the magnitude of change, respectively. The analysis revealed significant decreasing trend of rainfall during monsoon and post-monsoon seasons in the Barak basin during 1901–2010. Annual as well as monsoon rainfall during the recent 30-year normal period decreased significantly in both the basins. The last decade (2001–10) was the leanest decade in both the basins. Recent rainfall fluctuations with larger amplitudes indicate greater degree of uncertainties of heavy floods or short spell drought events.


Monsoon Rainfall Monsoon Trough Rainfall Series Excess Rainfall Monsoon Depression 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Authors are grateful to the Regional Meteorological Centre (India Meteorological Department), Guwahati, Assam for providing the data used in this study. Authors are also grateful to the anonymous reviewer for the critical review, which helped in improving the quality of the paper.


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Copyright information

© Springer-Verlag Wien 2012

Authors and Affiliations

  • R. L. Deka
    • 1
  • C. Mahanta
    • 1
  • H. Pathak
    • 2
  • K. K. Nath
    • 3
  • S. Das
    • 2
  1. 1.Centre for EnvironmentIndian Institute of Technology GuwahatiGuwahatiIndia
  2. 2.Regional Meteorological CentreGuwahatiIndia
  3. 3.Department of AgrometeorologyAssam Agricultural UniversityJorhatIndia

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