Trend analysis of time series rainfall data using robust statistics

Arati Paul; Riddhidipa Bhowmik; V. M. Chowdary; Dibyendu Dutta; U. Sreedhar; H. Ravi Sankar

doi:10.2166/wcc.2017.141

journal article Jul 12, 2017

Trend analysis of time series rainfall data using robust statistics

Arati Paul Riddhidipa Bhowmik V. M. Chowdary Dibyendu Dutta U. Sreedhar H. Ravi Sankar

Journal of Water and Climate Change Vol. 8 No. 4 pp. 691-700 · IWA Publishing

View at Publisher Save 10.2166/wcc.2017.141

Abstract

AbstractA temporal rainfall analysis was carried out for the study area, Rajahmundry city located in lower Godavari basin, India, during the period 1960–2013. Both the parametric and non-parametric approaches were envisaged for identifying the trends at different temporal scales. Linear and robust regression analysis revealed a negative trend at weekly scale during monsoon months, but failed to signify the slope at 95% confidence level. The magnitude of Sen's slope was observed to be negative during the months of April–September. Results of the Mann–Kendall test ascertained the negative rainfall trends during the monsoon months of June and July with a significant trend at 95% confidence interval. Application of robust statistics for long-term rainfall analysis helped to address the outlier's problem in the dataset. The Mann–Kendall test rejected the null hypothesis for all months except February–May and August after exclusion of outliers. Overall, a negative trend during monsoon season and a positive trend during post-monsoon season were observed using a robust non-parametric approach. Further, good correlation was found between the total rainfall and rainy days during the study period. On average, 21.25% days of a year is considered as rainy, while heavy and extreme rainfall in this region together occupies nearly 15% of the rainy days.

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Details

Published: Jul 12, 2017
Vol/Issue: 8(4)
Pages: 691-700

Authors

A

Arati Paul

Regional Remote Sensing Centre – East, NRSC, ISRO, Kolkata, India

R

Riddhidipa Bhowmik

Department of Computer Application, Narula Institute of Technology, Kolkata, India

V

V. M. Chowdary

Regional Remote Sensing Centre – East, NRSC, ISRO, Kolkata, India

D

Dibyendu Dutta

Regional Remote Sensing Centre – East, NRSC, ISRO, Kolkata, India

U

U. Sreedhar

Central Tobacco Research Institute, Rajahmundry, Andhra Pradesh, India

H

H. Ravi Sankar

Central Tobacco Research Institute, Rajahmundry, Andhra Pradesh, India

Cite This Article

Arati Paul, Riddhidipa Bhowmik, V. M. Chowdary, et al. (2017). Trend analysis of time series rainfall data using robust statistics. Journal of Water and Climate Change, 8(4), 691-700. https://doi.org/10.2166/wcc.2017.141

Trend analysis of time series rainfall data using robust statistics

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