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A study on the variation coefficient of annual runoff of the rivers in northwest China

ABSTRACT The coefficient of variation C v of annual runoff of rivers is the main indication for the yearly variation in river runoff. The study of the variation of annual runoff C V y of the rivers in northwest China is not only valuable for water conservancy projects and agriculture, but also for understanding the relationship between glacier ablation and river runoff, as well as for utilization of water resources from glacier-fed rivers, thus it is of definite significance in the domain of science. Starting with analysis of the main factors, this paper investigates the quantitative relationship between C v and other variables, the laws governing variation of C v with altitude, and its distribution features in rivers with different alimentations.