Abstract:

Taking the leading reservoir of a basin as  research object, the annual runoff data from 1952 to 2013 was selected. Based on Matlab calculation,the variation period and trend of the annual runoff series of the leading reservoirs in the basin are analyzed by continuous power spectrum method, Kendall rank correlation test and Spearman rank correlation test. The results indicate that there were no obviously change period but a slightly decreasing trend in the annual runoff series of the leading reservoir.

Key words:

Matlab, annual runoff series, variation period;variation trend;reservoir