摘要
枯水径流时间演化规律研究的内容非常广泛,如枯水径流发生的时间、频率分布、趋势和周期分析等,但从研究现状来看,处在丰水地区的广东省对枯水径流时间演化规律的研究还十分少见,因此文章根据广东省枯水所具备的特点,选取枯水径流发生时间和频率分布两个方面进行了研究。首先选取1956—2000年广东省境内8大水系上各控制站点的最小月径流量,采用统计分析的方法,对各站最小月径流量发生时间规律进行了研究,结果表明,广东省内出现最小月径流量的大多数月份是2月,占总统计月份数的32.3%,其次为12月、1月和3月;其次选取较为典型的西枝江流域九洲站1959—2002年44年间的实测径流最小日流量资料,分别采用两参数对数正态、P-Ⅲ型、对数P-Ⅲ型和耿贝尔型四种分布曲线进行适线,结果表明,P-Ⅲ型最为符合年最小日流量频率分布。
The contents of the study on the evolutionary laws of low flows is abroad, such as the time low flow happened, frequency analysis, trend and cycle analysis, and so. But this study is not more in Guangdong province, so based on the characteristics of water, the law of the time when low flow happen and the frequency analysis are studied in this paper. Firstly, taking the series of the minimum monthly runoff from 8 control water stations which represent the characteristics of water systems in Guangdong province, the evolution law of low flows has been analyzed, including the month that the minimum monthly runoff happen and its causes and affects. While based on comparing four typical theoretical frequency distributions that are logarithmic normal distribution, Pearson-Ⅲ distribution, logarithmic Pearson--Ⅲ distribution and Gumbel distribution, the result shows that the Pearson--Ⅲ distribution is the best of the type of the low flows frequency distribution in Jiu Zhou-jiang station which is represented the whole system in Guangdong Province.
出处
《生态环境》
CSCD
北大核心
2007年第2期617-622,共6页
Ecology and Environmnet
基金
国家自然科学基金项目(50579078)
广东省自然科学基金项目(04009805)
关键词
枯水
时间演化
枯水流量
频率分析
low flows
law of temporal change
discharge of low flows
analysis of low flow frequency
