P-Ⅲ、对数P-Ⅲ和GL分布线型比较研究

Comparison among Theoretical Frequency Distributions of P-Ⅲ, Log P-Ⅲ and GL

以淮河和珠江流域为研究对象．收集了淮河18个和珠江16个水文站1951～2010年长系列日流量资料。通过年极大值取样，应用线性矩法估计参数，比较分析了P-Ⅲ、对数P-Ⅲ和GL分布曲线在两个流域洪水频率分析计算情况。研究结果表明，对于小概率事件，在这两个流域对数P-Ⅲ和GL分布曲线设计洪水值要大于P-Ⅲ曲线分布计算的值，而通过误差分析，P-Ⅲ曲线的误差整体上小于对数P-Ⅲ曲线．

The theoretical frequency distributions of P-Ⅲ, Log P-ⅢI and GL （Generalized Logistic Distribution） were compared and analyzed by using annual maximum sampling and L-moment method in the river basins of the Huaihe and Pearl, where there are 18 and 16 hydrometry stationd with data series （1951-2010） collected, respectively. The results show that the design flood from the curve of P-IU is less than that from the other two curves and the errors of P-Ⅲ are less than these of log P-Ⅲ by analyzing the errors of the curve fitting in these two basins.