Based on the precipitation data of Taohe River basin and surrounding rain-gauges from 1956 to 2013 and using Wavelet analysis method, it involved precipitation changing trend of Taohe River basin during recent 58 a, the changing process of the long-time scale main cycle and its spatial variation characteristics, and the forecast analysis about its future trend. The results have shown that the overall annual precipitation in the Taohe River basin has a tendency to decrease at an average rate of -4. 60 mm/10 a. Then, periodic variation of annual precipitation has 3 scales of 20 a, 12 a and 5 a respectively, in which 20 a scale periodic oscillation is the strongest and goes through the whole time domain. Next, it has obvious difference in spatial distribution that the cycle fluctuation about each scale around downstream area is significantly stronger than that of the upstream region. Finally, expectation can be made that during the period of 2014-2021, except somewhat less in 2017, the rest of the years will be in the normal or somewhat higher years.
wavelet analysislong-time scale characteristicsprecipitationTaohe River basin
国家科技期刊平台
NSTL
维普
万方数据
