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Development of site-specific time distribution pattern of rainfall for Tarapur, India

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Abstract

Generalised dimensionless temporal patterns of rainfall were developed using 17 yr-long hourly rainfall records from Tarapur, on the west coast of India, in conventional approach and without any synthetic tweaking of observed rainstorms. Higher percentile curves (higher intensity rainstorms), as well as lower duration rainstorms, produced steeper initial segments, reflecting site-specific rainstorm characteristics, typical for southwest monsoon rainfall occurring at Tarapur. Patterns derived at Tarapur differed from NRCS Type-III curves for tropical rainfall in US, which has the steepest segment in the middle. Compared to regional studies applicable for Tarapur, site-specific curves were conservative. A proposed risk metric indicated that local infrastructure and hydraulic elements might get underdesigned, if generic rainfall pattern is adopted. The curves thus generated would be inputs for development/augmentation of local infrastructure facilities, accommodating climate change scenarios, especially for important industrial or nuclear installations at and around Tarapur. This is the first study to analyse the departures of site-specific temporal distribution from generic rainfall curves available in literature, for tropical rainfall in the Indian subcontinent.

Research highlights

  • Site-specific temporal patterns of rainfall were generated and compared to generic curves for the first time in India, for Tarapur, a location on west coast of India.

  • When compared to the generic temporal patterns of rainfall applicable for Tarapur, the developed curves were usually conservative.

  • The generic temporal patterns were closer to 95 percentile of site-specific pattern till around first 20% duration of storm, and were closer to the 85 percentile pattern subsequently.

  • A risk metric is proposed for evaluation of the flooding risk of earlier designs based on generic temporal distribution of rainfall from literature or earlier site-specific distributions as well.

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Acknowledgements

The authors take this opportunity to sincerely acknowledge the contribution of the officials at Environmental Survey Laboratory, Tarapur, India, for recording and providing high-quality rainfall data used for the study. The authors also appreciate Homi Bhabha National Institute authorities for granting permission to undertake part of this study for partial fulfilment of the requirements of award of M.Tech. degree to the first author from the Institute. The authors are sincerely indebted to the Editors and anonymous reviewers for their critical comments and suggestions, which significantly improved the technical content and clarity of the manuscript.

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Authors and Affiliations

Authors

Contributions

R Harshanth: Analysis of data and tabulation of results; Saha Dauji: Data acquisition, methodology, writing (text, tables, plots), risk metric method: analysis, results, and plots, location map preparation, additional literature review for revision, revision and formatting; P K Srivastava: Data acquisition, methodology, review and editing, location map acquisition, and revision. All authors read, corrected and approved the final manuscript.

Corresponding author

Correspondence to Saha Dauji.

Additional information

Communicated by Parthasarathi Mukhopadhyay

Appendix

Appendix

See tables A1 and A2.

Table A1 Number of storms for different durations (individual/group) at Tarapur (1997–2013).
Table A2 Coefficients of the generalised dimensionless cumulative mass curve of rainfall developed for Tarapur, Maharashtra, India.

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Harshanth, R., Dauji, S. & Srivastava, P.K. Development of site-specific time distribution pattern of rainfall for Tarapur, India. J Earth Syst Sci 132, 77 (2023). https://doi.org/10.1007/s12040-023-02086-1

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  • DOI: https://doi.org/10.1007/s12040-023-02086-1

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