摘要
概述了枯水频率分析的研究进展,采用低定量取样,应用泊松和指数(Po-Ex)分布分别拟合低定量系列的年发生次数和量级,并与皮尔逊III型(P3)模型进行比较.实测枯水流量系列和统计试验的计算结果表明,Po-Ex模型的拟合和预测效果较好,要优于采用年最小流量取样和P3模型的枯水频率分析.基于低定量取样的模型可利用更多枯水流量信息,具有更强的物理相关性.为枯水频率分析提供了一条新的途径.
Low-flows under threshold （LUT） series have been used as an alternative to annual minima series in low flow frequency analysis. The Po-Ex model is derived from the combination of Poisson process for annual occurrence number and the exponential distribution for magnitudes of LUT series. Based on the observed data and statistical experiment, the proposed model is compared with P3 model. The results indicate that the Po-Ex model based on the LUT series has better descriptive ability and predictive ability than that of the P3 model based on the annual minima series. The Po-Ex model incorporates more information of low flow and has more physical relevant. It is suggested that the Po-Ex model can be used in low flow frequency analysis.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2006年第2期1-4,共4页
Engineering Journal of Wuhan University
基金
水利部重大科研项目"水库设计运用专题研究"
教育部重大科研项目(104204)资助
