Abstract
Although water resources management practices recently use bivariate distribution functions to assess drought severity and its frequency, the lack of systematic measurements is the major hindrance in achieving quantitative results. This study aims to suggest a statistical scheme for the bivariate drought frequency analysis to provide comprehensive and consistent drought severities using observed rainfalls and their uncertainty using synthesized rainfalls. First, this study developed a multi-variate regression model to generate synthetic monthly rainfalls using climate variables as causative variables. The causative variables were generated to preserve their correlations using copula functions. This study then focused on constructing bivariate drought frequency curves using bivariate kernel functions and estimating their confidence intervals from 1,000 likely replica sets of drought frequency curves. The confidence intervals achieved in this study may be useful for making a comprehensive drought management plan through providing feasible ranges of drought severity.
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Acknowledgments
This work was supported by Grants from Korean National Research Foundation (No. 2010-0016717) and Korean National Emergency Management Agency (NEMA-11-NH-40). The authors also thank the anonymous reviewers for their constructive comments and corrections.
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Yoo, J., Kim, U. & Kim, TW. Bivariate drought frequency curves and confidence intervals: a case study using monthly rainfall generation. Stoch Environ Res Risk Assess 27, 285–295 (2013). https://doi.org/10.1007/s00477-012-0588-7
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DOI: https://doi.org/10.1007/s00477-012-0588-7