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Based on the annual runoff and sediment data of Zongguantian hydrological station, time-frequency wavelet transform characteristics and their periodic rules of high and low flow alternating change were analyzed in multi-time scales by the Morlet continue wavelet transformation (CWT). It is concluded that the primary periods of runoff and sediment load time series of the high and low annual flow in the different time scales were 12-year, 3-year and 26-year, 18-year, 13-year, 5-year,doi:10.1088/1755-1315/108/3/032067 fatcat:rnhw4eyknvgvlaakmcagtd7t6e