Assessing hydrologic drought risk using multi-dimensional copulas: case study in Karkheh River basin

Drought severity, duration and magnitude are important for evaluating the drought condition. This study developed multivariate (Joint Deficit Index) JDI and then used bivariate and trivariate copulas to assess hydrological drought risk in the Karkheh River basin in the west of Iran, since there exists a significant dependency between severity (S), duration (D), and magnitude (M). The JDI was constructed by implementing Kendall’s empirical copula...