Abstract
The statistical study of rainfall time series is one of the approaches for efficient hydrological system design. Identifying, and characterizing long-term rainfall time series could aid in improving hydrological systems forecasting. In the present study, eventual statistics was applied for the long-term (1851–2006) rainfall time series under seven meteorological regions of India. Linear trend analysis was carried out using Mann–Kendall test for the observed rainfall series. The observed trend using the above-mentioned approach has been ascertained using the innovative trend analysis method. Innovative trend analysis has been found to be a strong tool to detect the general trend of rainfall time series. Sequential Mann–Kendall test has also been carried out to examine nonlinear trends of the series. The partial sum of cumulative deviation test is also found to be suitable to detect the nonlinear trend. Innovative trend analysis, sequential Mann–Kendall test and partial cumulative deviation test have potential to detect the general as well as nonlinear trend for the rainfall time series. Annual rainfall analysis suggests that the maximum changes in mean rainfall is 11.53% for West Peninsular India, whereas the maximum fall in mean rainfall is 7.8% for the North Mountainous Indian region. The innovative trend analysis method is also capable of finding the number of change point available in the time series. Additionally, we have performed von Neumann ratio test and cumulative deviation test to estimate the departure from homogeneity. Singular spectrum analysis has been applied in this study to evaluate the order of departure from homogeneity in the rainfall time series. Monsoon season (JS) of North Mountainous India and West Peninsular India zones has higher departure from homogeneity and singular spectrum analysis shows the results to be in coherence with the same.
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Acknowledgements
The authors are grateful to the Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, India. The authors are also thankful to the central library, Indian Institute of Technology Roorkee, India, for providing access to all research papers (http://mgcl.iitr.ac.in/). They are also thankful to the Ministry of Human Resource Development, Government of India, for their regular fellowship to conduct research. The authors are also thankful to all the anonymous reviewers.
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Tiwari, H., Pandey, B.K. Non-parametric characterization of long-term rainfall time series. Meteorol Atmos Phys 131, 627–637 (2019). https://doi.org/10.1007/s00703-018-0592-7
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DOI: https://doi.org/10.1007/s00703-018-0592-7