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Evolution of ENSO Related Rainfall Anomalies for Lower Tapi River, India

8 pagesPublished: July 22, 2017

Abstract

The present study is an attempt to detect anomalies in rainfall for lower Tapi basin due to ENSO events. Daily rainfall data have been used for the present analysis. The data have been collected from state water data centre from 1961 to 2001. With the availability of suitable data 1982, 1986, 1987, 1991, 1997, 2002 and 2009 are the El Nino years and 1988, 1998, 1999, 2007 and 2010 are the La Nina years analysed for the present study. The yearly extreme precipitation indices have been computed for frequency, intensity and duration for the base period 1981 to 2010. For the El Nino years 1997 and 2009 positive anomalies have been observed in the frequency based indices. In the years 1982, 1987, 1991, 1997, 2002 and 2009, positive anomalies have been observed for the intensity based indices. Positive anomalies results into better rainfall during El Nino events. Negative anomalies have been observed in the years 1998 and 1999 of the La Nina events for the frequency based indices and for the years 1988, 1998, 1999, 1007 and 2010 negative anomalies have been observed in the intensity based indices. The analysis of La Nina events results in a decrease in rainfall. The precipitation duration based indices have not indicated clear trend. The overall analysis showed that ENSO is not directly affecting the rainfall of the study region.

Keyphrases: Anomalies, El Nino, ENSO, Extreme climate indices, La Nina, Lower Tapi basin

In: C. D. Modhera, G. J. Joshi, D.P Soni, Indrajit N. Patel, A. K. Verma, L. B. Zala, S. D. Dhiman, D. R. Bhatt, Jagdish M. Rathod, Bhargav C. Goradiya, Mehfuza S. Holia and Dharita K. Patel (editors). ICRISET2017. International Conference on Research and Innovations in Science, Engineering and Technology. Selected Papers in Civil Engineering, vol 1, pages 410--417

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BibTeX entry
@inproceedings{ICRISET2017:Evolution_of_ENSO_Related,
  author    = {Paresha Baria and Sanjaykumar M. Yadav},
  title     = {Evolution of ENSO Related Rainfall Anomalies for Lower Tapi River, India},
  booktitle = {ICRISET2017. International Conference on Research and Innovations in  Science, Engineering and Technology. Selected Papers in Civil Engineering},
  editor    = {C. D. Modhera and G. J. Joshi and D.P Soni and Indrajit N. Patel and A. K. Verma and L. B. Zala and S. D. Dhiman and D. R. Bhatt and Jagdish M. Rathod and Bhargav C. Goradiya and Mehfuza S. Holia and Dharita K. Patel},
  series    = {Kalpa Publications in Civil Engineering},
  volume    = {1},
  pages     = {410--417},
  year      = {2017},
  publisher = {EasyChair},
  bibsource = {EasyChair, http://www.easychair.org},
  issn      = {2515-1789},
  url       = {https://easychair.org/publications/paper/VW2D},
  doi       = {10.29007/vjgz}}
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