摘要
以西江流域控制性水文站最枯月径流、枯水期平均径流序列作为频率分析的特征指标,采用PPCC检验法,对10个水文站点6种理论概率分布进行了对比计算,并分析了不同线型、不同频率区间内枯水设计值的误差变化趋势及外延可靠性。结果表明,采用三参数对数正态分布描述西江流域枯水径流概率分布最优,对数皮尔逊Ⅲ型分布次之,最优分布型式在流域空间分布上无明显差异,在西江流域枯水径流实际水文频率计算时应分析所用频率曲线的可靠性,慎用外延值。
Taking the Xijiang basin for an example,the probability plot correlation coefficient（PPCC） method is used to analyze frequency characteristic index of ten hydrologic stations and compare with six kinds of flow theoretical probability distributions.Then the errors variation trends of low water design are analyzed for each theoretical distribution in different frequency interval.The results show that the LN-3 frequency distribution is the best fitted for low flow series,followed the LP-Ⅲ distribution;while the optimal distribution type in Xijiang basin has no obvious difference in spatial distribution.Thus,it should analyze the reliability of frequency curve for calculation of low water hydrologic frequency in Xijiang basin and the extension of frequency curve must be considered reasonably.
出处
《水电能源科学》
北大核心
2011年第4期11-13,130,共4页
Water Resources and Power
基金
水利部公益性行业专项基金资助项目(200901035)
珠江水利委员会珠江水利科学研究院开放研究基金资助项目(ZKF1004)
