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水文特征变异研究是水文学研究中的重点之一。水文特征变异不仅包括时间、空间上的概念,还包括属性上的概念。研究水文序列在属性、时间及空间上的变异,才能够全面地反映水文序列的变异情况。论文探讨了水文特征变异的内涵,提出水文特征变异是研究对象或现象在属性、时间和空间上的变异量度。以北江流域径流量及降雨量资料为基础,全面分析了属性范畴下及时空范畴下北江流域水文序列的变异情况。结果表明:1992—2006年的径流量序列和1973—2006年的径流量序列相对于1956—1972年的径流量序列都发生了变异;从重心移动方向来看,北江流域在1959、1967、1975和1983年移动方向发生了转折,从重心移动的距离来看,降雨重心离多年平均较远的年份分别是1967、1975、1983和2000年。
Hydrological variation study is one of the focuses of hydrological research. Hydrological characteristics of variation include not only time and space concepts, but also includes the concept of attributes. Hydrological sequences in the study of property, time and space variations, can fully reflect the variation of hydrological sequences. The paper explores the connotation of the variation of hydrological features and proposes that the variation of hydrological features is a measure of the variation of the research object or phenomenon in attributes, time and space. Based on the data of runoff and rainfall in the Beijiang River Basin, the variation of hydrological sequences in the Beijiang River Basin under the category of attributes and in the context of time and space is analyzed comprehensively. The results show that both the runoff series from 1992 to 2006 and the runoff series from 1973 to 2006 have a variation with respect to the runoff series from 1956 to 1972. From the moving direction of the center of gravity, Beijiang River Basin in 1959, 1967, 1975 In 1983 and 2000, the turning point of the direction of the movement, from the center of gravity of the distance from the point of view, the center of gravity from far away years of average years are 1967, 1975, 1983 and 2000 respectively.