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자료유형
학술대회자료
저자정보
Jehanzaib, Muhammad (Department of Civil and Environmental Engineering, Hanyang University) Kim, Ji Eun (Department of Civil and Environmental System Engineering, Hanyang University) Park, Ji Yeon (Department of Civil and Environmental System Engineering, Hanyang University) Kim, Tae-Woong (Department of Civil and Environmental Engineering, Hanyang University, Ansa)
저널정보
한국수자원학회 한국수자원학회 학술발표회 한국수자원학회 2019년도 학술발표회
발행연도
2019.1
수록면
151 - 151 (1page)

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Because drought is a complex and stochastic phenomenon in nature, statistical approaches for drought assessment receive great attention for water resource planning and management. Generally drought characteristics such as severity, duration and intensity are modelled separately. This study aims to develop a relationship between drought characteristics using a bivariate copula model. To achieve the objective, we calculated the Standardized Precipitation Index (SPI) using rainfall data at 6 rain gauge stations for the period of 1961-1999 in Jehlum River Basin, Pakistan, and investigated the drought characteristics. Since there is a significant correlation between drought severity and duration, they are usually modeled using different marginal distributions and joint distribution function. Using exponential distribution for drought severity and log-logistic distribution for drought duration, the Galambos copula was recognized as best copula to model joint distribution of drought severity and duration based on the KS-statistic. Various return periods of drought were calculated to identify time interval of repeated drought events. The result of this study can provide useful information for effective water resource management and shows superiority against univariate drought analysis.

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