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Based on the daily precipitation data of 15 ground stations in the source regions of the Yellow River, the daily runoff data of Tangnaihai Hydrological Station and the wavelet analysis method, this paper analyzed the periodic law, change trend and correlation of precipitation and runoff in the flood season of the source regions of the Yellow River from 1961 to 2020. The results show that a) the precipitation and runoff in the flood season of the source regions of the Yellow River in the past 60 years have the characteristics of multi-time scales, and the variation trends of precipitation and runoff in flood season are different at different time scales. b) The precipitation and runoff series in flood season have the main periods of about 63 years and about 35 years, and the average periods of the three time scales are about 41 years and 25 years, respectively. The precipitation and runoff in flood season have a certain positive correlation. c) Under the 63-year characteristic time scale, it can be predicted that the precipitation and runoff in the flood season of the source regions of the Yellow River will decrease in the next 5-10 years after 2020. [ABSTRACT FROM AUTHOR]

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Influenced by the climate changes and human activities, the agreement of the hydro-meteorological time series in the source region of the Yellow River has be changed, which maybe bring negative effect on the prediction of water resources of the Yellow River. The abrupt change point of the meteorological and hydrological series in the source area of the Yellow River during recent 60 years were discussed in the paper by moving-T test, fixed step moving-F test, order cluster analysis method, Mann-Whitney U test and Mann-Kendall-Sneyers test. After an overall analysis, the abrupt change point of the meteorological and hydrological series might be happened in 1989 and 2017. Moreover, by using of mean validation analysis, the conclusion showed that the annual runoff and annual maximum peak discharge were significantly reduced since 1989. [ABSTRACT FROM AUTHOR]