Regional Flood Frequency Analysis of the Seven Sites of Punjab, Pakistan, Using L-Moments |
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Authors: | Zamir Hussain G R Pasha |
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Affiliation: | (1) Department of Statistics, Bahauddin Zakariya University, Multan, Pakistan |
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Abstract: | L-moments based regional flood frequency analysis has been carried out on the seven sites of Punjab, Pakistan. Discordancy
measure in terms of L-moments has been used to screen the data on each of the seven sites. Homogeneity of the region has been
tested using the L-moments based heterogeneity measure (H). H has been calculated using four parameter Kappa distribution with 500 simulations. In order to find the most suitable distribution
for quantile estimates, a number of L-moments based frequency distributions, such as, generalized logistic (GLO), generalized
extreme-value (GEV), generalized normal (GNO), Pearson type III (PE3), generalized Pareto (GPA) and five parameter Wakeby
(WAK) distribution, have been used. Based on the L-moment ratio diagram and Z
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statistic, three distributions; GNO, GPA and GEV have been identified as the suitable candidates for regional distribution.
Accuracy measures for the estimated regional growth curves and quantiles have been calculated for the three candidate distributions,
using Monte Carlo simulations. Simulations study showed that GNO distribution is the robust distribution with GPA as suitable
alternative but GEV is not an appropriate distribution for the study area. |
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Keywords: | Discordancy measure Flood frequency L-moments Quantile estimates |
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