松花江干流中游段径流年内分配变化规律

为了研究松花江干流中游段的径流年内分配变化规律,以哈尔滨站和佳木斯站1954—1987年、2001—2007年的逐日流量资料为基础,对径流年内分配的不均匀性、集中程度和变化幅度等指标进行了分析计算.结果表明:(a)松花江干流中游段在20世纪70年代径流年内分配较为均匀,80年代最不均匀;哈尔滨站的径流年内分配不均匀性和集中度通常要小于佳木斯站;最大径流出现的时间哈尔滨站滞后于佳木斯站.(b)2个站径流年内分配不均匀系数、完全调节系数、集中度和集中期的变化过程是同步的,且前3个指标之间具有较大的相关关系.

Changes of annual runoff distribution in middle reaches of Songhua River

In order to analyze the changes of the annual runoff distribution in the middle reaches of the Songhua River,indices including unevenness,concentration degree,and variation were defined and calculated based on the daily runoff data at Harbin and Jiamusi hydrological stations during the periods from 1954 to 1987 and from 2001 to 2007.The results show the following:(a) The annual runoff distribution in the middle reaches of the Songhua River was comparatively even in the 1970s and mostly uneven in the 1980s.The unevenness and concentration degree of the annual runoff distribution at Harbin Station were lower than those at Jiamusi Station.The time of occurrence of the maximum runoff at Harbin Station was later than that at Jiamusi Station.(b) The changes of the unevenness coefficient,the complete accommodation coefficient,the concentration degree,and the concentration period of the annual runoff distribution at the two stations were consistent,and there was a close correlation between the former three indices.