Abstract
In this study, a regional rainfall frequency analysis has been conducted for the Lower Brahmaputra Basin in India, and regional rainfall intensity-duration-frequency curves are generated. Two sets of data have been used in this study—annual maximum series (AMS) and partial duration series (PDS). The discordancy measure (Di) was used to assess each of these 12 data sets from the Lower Brahmaputra Basin. For both data sets, it was verified that all the 12 sites form a homogeneous zone using the heterogeneity measure (H), which was based on the L-moments technique. The generalised extreme value, generalised logistic, generalised Pareto, lognormal, and Pearson Type III frequency distributions were considered as candidate distributions in this study. The generalised extreme value distribution has been recognised as the best-fit distribution for the region based on AMS, whereas the generalised Pareto distribution has been identified as the best-fit distribution for the region based on PDS, using the L-moment goodness of fit test measure. Then using the regional frequency relationship for the best fit distribution for the region, the IDF curves for this region have been constructed. Finally, rainfall IDF relationships were found out for the region based on three general IDF relationships—the original Kothyari and Garde IDF equation for India, the updated Kothyari and Garde IDF equation and the Sherman IDF equation.
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ACKNOWLEDGMENTS
We thank Indian Meterological Department (IMD), Pune, which had provided daily rainfall data for this research.
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Sarma, B., Chakrabarty, D. Regional Rainfall Frequency Analysis in the Lower Brahmaputra Basin. Water Resour 50, 600–609 (2023). https://doi.org/10.1134/S009780782304005X
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DOI: https://doi.org/10.1134/S009780782304005X