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KMID : 1024519990080040431
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Journal of the Environmental Sciences
1999 Volume.8 No. 4 p.431 ~ p.441
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Regional Drought Frequency Analysis of Monthly Precipitation with L-Moments Method in Nakdong River Basin
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Kim Sung-Won
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Abstract
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In this study, the regional frequency analysis is used to determine each subbasin drought frequency with reliable monthly precipitation and the L-Moments method which is almost unbiased and has very nearly a normal distribution is used for the parameter estimation of monthly precipitation time series in Nakdong river basin. As the result of this study, the duration of ’93-’94 is most severe drought year than any other water year and the drought frequency is established as compared the regional frequency analysis result of cumulative precipitation of 12th duration months in each subbasin with that of 12th duration months in the major drought duration. The Linear regression equation is induced according to linear regression analysis of drought frequency between Nakdong total basin and each subbasin of the same drought duration. Therefore, as the foundation of this study, it can be applied proposed method and procedure of this study to the water budget analysis considering safety standards for the design of impounding facilities large-scale river basin and for this purpose, above all, it is considered that expansion of reliable preciptation data is needed in watershed rainfall station.
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KEYWORD
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regional drought frequency, L-moments method, water year, partial duration series, linear regression analysis, L-coefficient of vaariation, L-skewness, L-kurtosis
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