Abstract
The periodic effect of runoff time series is a basic characteristic that reflects the change law of river hydrological situation. In order to reveal the influence of power station regulation on the periodic change of runoff process, the Gangkouwan Station, the controlling reservoir of the Shuiyangjiang River, was taken as the object in this article, based on the Morlet wavelet analysis technique, the influence of the reservoir on the periodic characteristics of natural runoff was analyzed and the influence of the reservoir on the periodic effect of runoff process of downstream channel on different time scales was revealed. The results show that the Gangkouwan Station significantly affects the periodic change of runoff on the 1-year, 4-month and 1-day scales, and among them, periodic change on the 1-day scale shows change law of day night alternative wetness-dryness.
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