Observed trends in indices for daily rainfall extremes specific to the agriculture sector in Lower Vellar River sub-basin, India

Extreme rainfall trends over Lower Vellar sub-basin
  • Amanda JayadasEmail author
  • N K Ambujam


Globally, climate change has caused changes in frequency and intensity of climate extremes such as heat waves, droughts, floods and tropical cyclones. There is a need to understand the pattern of regional climate extremes to develop crucial adaptation strategies for the farming community. This paper focuses on developing the Expert Team on Climate Risk and Sector-specific Indices for rainfall, relevant for the agriculture and food security sector. The indices have been developed for Lower Vellar River sub-basin, a coastal basin in Tamil Nadu, India. Trend analysis has been done for the climatic and cropping seasons in the sub-basin. Overall, there has not been any trend in the annual rainfall index values. The monthly trend values for the different indices have mostly exhibited insignificant trends throughout the study period (1978–2015) except for a few indices. Overall, the southwest monsoon season has shown a significantly decreasing trend in the indices. The northeast monsoon season has shown insignificant trends with positive slopes for most indices. There were insignificant or no trends in the indices for the summer season. The findings from the study can be used as a guiding tool for developing adaptation strategies, for the farming community.


Climate variability and change monsoon observations extreme climate indices agriculture and food security trend analysis 



We acknowledge Sakthivadivel R, Emeritus Professor, Anna University, Chennai, for his valuable guidance throughout the research period. A special thanks to Arun Babu E for discussions and critical comments. Finally, we thank the anonymous reviewers and the editor for their comments which helped in refining this paper.


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Centre for Water ResourcesAnna UniversityChennaiIndia

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