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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 research on the law of runoff time evolution is very extensive, such as the time, frequency distribution, trend and period analysis of low water runoff. However, from the research status quo, The study of law is still very rare. Therefore, this paper studies the characteristics of the low water in Guangdong Province and selects the time and frequency distribution of low-flow. First of all, the minimum monthly runoff of each control site in 8 major water systems in Guangdong Province from 1956 to 2000 was selected. The statistical analysis was used to study the minimum monthly runoff time of each station. The results showed that the minimum monthly runoff occurred in Guangdong Province, Most of the monthly runoff was in February, accounting for 32.3% of the total monthly statistics, followed by December, January and March. Second, the more typical Jiuzhou station in the Xizang River Basin was 1959-2002 44 years The measured daily minimum runoff data were respectively fitted with two parameter logarithm normal, P-Ⅲ type, logarithm P-Ⅲ type and Gumbel-type four kinds of distribution curves. The results showed that the P-Ⅲ type was most suitable for the year minimum Daily flow frequency distribution.