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.
onghua Riverrunoffannual distributionunevennessconcentration degreeconcentration period
NETL
NSTL
万方数据
维普
