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枯水径流频率计算对于水资源评价、环境水利及工程水文分析有重要的现实意义。文中依据奎屯河流域三条主要河流1959-2006年48年径流序列资料,采用PPCC检验法对我国常用的5种水文频率分布线型进行检验,以选择适合奎屯河流域的最优线型。结果表明:奎屯河流域内三条最大的河流的代表性水文站最小月枯水序列和各时段枯水序列的枯水径流频率分布都是以P-Ⅲ型曲线最优,但流域内其它个别水文站也有以其它线型最优。最后对三条主要河流最小月和最小3个月枯水径流频率采用P-Ⅲ型曲线进行了计算,得出不同保证率的枯水径流。
The calculation of runoff frequency is of great practical significance for water resources assessment, environmental water conservancy and engineering hydrology analysis. According to the runoff series data of three major rivers in the Kuitun River basin from 1959 to 2006, the PPCC test is used to test the five kinds of hydrological frequency distribution lines commonly used in our country to select the optimal linear type for the Kuitun River Basin. The results show that the minimum monthly flow pattern of the representative hydrological stations and the low-frequency flow patterns of the low-lying hydrological series in each of the three largest rivers in the Kuitun River Basin are all P-Ⅲ type curves. However, other hydrological stations There are other linear optimization. Finally, the P-Ⅲ curve was used to calculate the runoff frequency of the three major rivers in the minimum month and the minimum three months, and the low water runoff with different guaranteed rates was obtained.