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中文摘要：
采用Frank和Gaussiancopulas函数分析二维干旱特征变量联合分布，构建Frankpair—copula、Gaussiancopula、M3copula函数，对比分析三维干旱联合特性。以渭河流域华阴站降雨资料为例，表明copulas函数能够很好地描述多变量干旱联合特性，体现了copulas函数在多变量联合特性研究中的可行性和适用性。
英文摘要：
Frank and Gaussian copulas are used to analyze two-dimensional joint distribution of drought variables. Frank pair-copula, Gaussian copula and M3 copula functions are established to compare and analyze three-dimensional joint distribution of drought variables. Taking the monthly precipitation data of Huayin Gauge Station located in the Weihe River Basin as an example to indicate copulas can well describe the multivariate joint drought characteristics and reflect the feasibility and applicability of copulas in the study of multivariate joint characteristics.
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