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Analysis of 500-year precipitation periodicity and prediction in Haihe River Basin
TAN Weili,ZHAO Yong,WANG Qingming,LIU Rong
(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of
Water Resources and Hydropower Research,Beijing 100038,China)
Abstract:Periodicity is a fundamental characteristic of precipitation sequences. There has been a long-standing
debate on whether the periodic analysis based on data from station sequences over the past 60 years can represent the
true regional precipitation cycles,making future predictions less convincing. Therefore,it is particularly necessary to
reconstruct precipitation sequences over longer periods and conduct periodic analyses. This study,based on the Long
Short-Term Memory (Long Short-Term Memory,LSTM)algorithm,combined with historical records of drought and
flood levels,as well as station monitoring data,reconstructed a 546-year precipitation sequence in the Haihe River
Basin and analyzed the periodic variations and future trends of precipitation. The main results are as follows. (1)A
drought-flood-precipitation model based on the LSTM algorithm was established,reconstructing the precipitation
sequence in the Haihe River Basin from 1477 to 2022. (2)The 546-year precipitation sequence reveals three signifi⁃
cant cycles in the Haihe River Basin:a 33-year cycle,a 66-year cycle,and a 17-year cycle. Currently,the domi⁃
nant cycle is the 33-year,but the amplitude signal of the 66-year cycle is strengthening. The PDO index shows a 64-
year periodic variation,providing a basis for the intense amplitude of the 66-year precipitation cycle. (3)At present,
precipitation in the Haihe River Basin is in a period of above-average rainfall. According to the 33-year cycle,it is
predicted that there is a 75% probability that the above-average rainfall period in the Haihe River Basin will continue
for 4 to 8 years since 2022,followed by a below-average rainfall period,which is expected to last approximately 15 to
18 years with an 86% probability. Adequate preparedness for water security in the Haihe River Basin is essential to
meet the severe challenges posed by drought cycles.
Keywords:Haihe River Basin;LSTM;precipitation reconstruction;precipitation periodicity;prediction
(责任编辑:耿庆斋)
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