摘要
线性矩法是在概率权重法基础上发展起来的一类分布函数参数确定方法.以年最小七日平均流量作为枯水径流的统计特征量,在水文站点一致性分析、水文相似区鉴别的基础上,以常见的5种三参数分布函数:Generalized Pareto分布(GPA)、Generalized Extreme-Value分布(GEV)、Generalized Logistic分布(GLO)、LogNormal分布(LN3)和Pearson typeⅢ(PⅢ)为研究对象进行东江流域区域枯水频率分析.分析结果表明,LN3为最适合东江流域的区域枯水分布.将实测枯水流量与采用区域化方法所得到的枯水模拟结果进行对比分析,结果表明区域化所得到的模拟精度较高,可以满足实际需要.
L-moments were a parameter identification method of the distribution function arosed from the probability weighted moments （PWM）. The 7-day low flow was regarded as statistical quantity, on the base of analysis of the discordancy measure and heterogeneity measure, the regional low flow frequency for Donjiang basin was carried out using L-moments based five frequency distributions with three parameters viz. Generalized Pareto （GPA）, Generalized extreme-value （GEV）, Generalized Logistic （GLO）, Lognormal （ LN3 ） and Pearson type Ⅲ （PⅢ）. Based on the L-moments ratio diagram, ｜Z^DIST｜ and T4—statistic criteria, LN3 distribution was identified as the most appropriate distribution for the homogeneous region with the 14 sites. The regional low flow estimates at each return period are obtained with the index flood procedure. Examination of the observed and computed low flow by the regional frequency analysis shows a good agreement in general, and the results may satisfy practical application.
出处
《应用基础与工程科学学报》
EI
CSCD
2005年第4期409-416,共8页
Journal of Basic Science and Engineering
基金
香港特别行政区研究资助局资助项目(CUHK4247/03H)
香港中文大学基金资助(2020712)
国家自然科学基金资助项目(50309002)
