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Uncertainty Analysis of Regional Rainfall Frequency Estimates in Northeast India

Nilotpal Debbarma, Parthasarathi Choudhury, Parthajit Roy, Shivam Agarwal

Abstract


Estimation of rainfall quantile is an important step in regional frequency analysis for planning and design of any water resources project. Related evaluations of accuracy and uncertainty help to further assist in enhancing the reliability of design estimates. In this study, therefore, we investigate the accuracy and uncertainty of regional frequency analysis of extreme rainfall computed from genetic algorithm-based clustering. Uncertainty assessment is explored with prediction of quantiles with a new spatial Information Transfer Index (ITI) and Monte Carlo simulation framework. And, accuracy assessment is done with the comparison of regional growth curves to at-site analysis for each homogenous region. Further, uncertainty assessment with the ITI method is compared with Maximum Likelihood estimation (MLE) optimized by a genetic algorithm (GA) to check the suitability of the method. Results obtained suggest the ITI-based uncertainty assessment for regional estimates outperformed those of at-site estimates. The MLE-GA method based on at-site estimates was found to be better than at-site estimates based on L-moments, suggesting the former as a better alternative to compare with regional frequency estimates. Moreover, minimal bias and least deviation of the regional growth curve were obtained in the rainfall regions. The confidence intervals of regional estimates were seen to be well within the bounds of normality assumptions.

 

Doi: 10.28991/cej-2021-03091762

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Keywords


L-Moments; Monte Carlo; Information Transfer Index; MLE; GA; Rainfall.

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Full Text: PDF

DOI: 10.28991/cej-2021-03091762

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Copyright (c) 2021 Nilotpal Debbarma, Parthasarathi Choudhury, Parthajit Roy, Shivam Agarwal

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