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Bivariate Flood Frequency Analysis of Upper Godavari River Flows Using Archimedean Copulas

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Field Value
 
Title Bivariate Flood Frequency Analysis of Upper Godavari River Flows Using Archimedean Copulas
 
Creator REDDY, MJ
GANGULI, P
 
Subject Archimedean copulas
Flood flows
Frequency analysis
Multivariate probability distributions
Return period
L-MOMENTS
DISTRIBUTIONS
VOLUME
INDIA
MODEL
 
Description In this paper, a copula based methodology is presented for flood frequency analysis of Upper Godavari River flows in India. By using the specific advantages of copula method in modeling the joint dependence structure of uncertain variables, this study applies Archimedean copulas for frequency analysis of flood characteristics annual peak flow, flood volume and flood duration. To determine the best fit marginal distributions for flood variables, few parametric and nonparametric probability distributions are examined and the best fit model is adopted for copula modeling. Four Archimedean family of copulas, namely Ali-Mikhail-Haq, Clayton, Gumbel-Hougaard and Frank copulas are evaluated for modeling the joint dependence of annual peak flow-volume, and flood volume-duration pairs. The performance of two parameter estimation methods, namely method-of-moments-like estimator based on inversion of Kendall's tau and maximum pseudo-likelihood estimator for copulas are investigated. On performing Monte Carlo simulation to assess the performance of copula distributions in modeling the joint dependence structure of flood variables, it is found that the developed copula models are well representing the observed flood characteristics. From standard statistical tests, Frank copula has been identified as the best fitted copula for both bivariate models. The Frank copula function is used for obtaining joint and conditional return periods of flood characteristics, which can be useful for risk based design of water resources projects.
 
Publisher SPRINGER
 
Date 2014-10-15T11:45:23Z
2014-10-15T11:45:23Z
2012
 
Type Article
 
Identifier WATER RESOURCES MANAGEMENT, 26(14)3995-4018
http://dx.doi.org/10.1007/s11269-012-0124-z
http://dspace.library.iitb.ac.in/jspui/handle/100/14821
 
Language en