Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14966
Title: Analysis of trends in rainfall and dry/wet years over a century in the Eastern Ganga Canal command
Authors: Krishan R.
Nikam B.R.
Pingale S.M.
Chandrakar A.
Khare, Deepak
Published in: Meteorological Applications
Abstract: In the present study, an attempt has been made to analyse the variability and trends in annual and seasonal rainfall over the Eastern Ganga Canal command area, India. To determine the trend in annual/seasonal rainfall and rainy days, the non-parametric Mann−Kendall test and Sen's slope method were used over daily gridded rainfall for the time period 1901–2012. The results of the trend analysis revealed a decreasing trend in annual and monsoon rainfall in the range 18.5−61.7 and 19.4−56.7 mm/decade, respectively. For annual and monsoon rainy days, the results demonstrated a decreasing trend which varied from 1.8 to 2.9 and 1.4 to 2.2 days/decade, respectively, and an increasing trend in the range 0.2−1.4 and 1.0 days/decade, respectively. A variability analysis was performed to highlight the need for selecting an appropriate confidence level in trend analysis. It was observed that the grids showing a statistically non-significant trend at the 95% confidence level exhibit a statistically significant trend at lower confidence levels. An analysis of dry and wet years on an annual scale revealed that the chances of occurrence of a wet year are more in comparison with the chances of occurrence of a dry year in the command area by a ratio of 14:13. However, data from the last one and a half decades has a contradictory trend with higher chances of occurrence of a dry year to very minimal chances of occurrence of a wet year. Dependable rainfall at various probability levels was estimated using a gamma distribution function. It was observed that the 75% dependable weighted annual and seasonal rainfall over the command area (985.48 and 727.54 mm) was significantly different with respect to the climatic mean weighted annual and seasonal rainfall against the weighted mean annual and seasonal rainfall (1,165.93 and 901.95 mm). © 2018 Royal Meteorological Society
Citation: Meteorological Applications (2018), 25(4): 561-574
URI: https://doi.org/10.1002/met.1721
http://repository.iitr.ac.in/handle/123456789/14966
Issue Date: 2018
Publisher: John Wiley and Sons Ltd
Keywords: dry/wet years
gamma distribution
moving average
rainfall trend
rainfall variability
ISSN: 13504827
Author Scopus IDs: 57194657307
55701561000
55921235700
57194659490
14060295600
Author Affiliations: Krishan, R., Department of WRD&M, Indian Institute of Technology (IIT) Roorkee, Roorkee, India
Nikam, B.R., Water Resources Department, Indian Institute of Remote Sensing (IIRS), Dehradun, India
Pingale, S.M., Research Management & Outreach Division, National Institute of Hydrology RoorkeeRoorkee, India
Chandrakar, A., Department of WRD&M, Indian Institute of Technology (IIT) Roorkee, Roorkee, India
Khare, D., Department of WRD&M, Indian Institute of Technology (IIT) Roorkee, Roorkee, India
Corresponding Author: Krishan, R.; Department of WRD&M, Indian Institute of Technology (IIT) RoorkeeIndia; email: radheyindia@hotmail.com
Appears in Collections:Journal Publications [WR]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.