为全面分析碧流河水库流域降水和径流变化特征，根据流域内1958－2011年的日降水及径流资料，运用基尼系数法、R/S分析法和小波分析法分别分析了降水和径流的年内变化特征、年际变化趋势和周期性特征。结果表明：流域内降水和径流年内分配极度不均匀，年内分配过程呈单峰型，月降水峰值在20世纪80年代后有峰值后移的特点；多年降水量和径流量均有减少趋势，径流量的减少趋势更显著，说明除降水减少外，还受其它因素的影响，如各种人类活动等；降水径流序列都呈现丰枯交替变化周期，变化主周期均为12～16 a，可能与太阳黑子周期活动有关；20世纪80年代后的径流周期较降水震荡性减弱，说明径流周期变化还受除降水外的其它因素的影响。

The temporal characteristics of intraannual and interannual precipitation and runoff in the Biliu River reservoir basin were investigated in this study based on daily data from 1958 to 2011.The Gini coefficient method,R/S analysis method and wavelet method were used to explore the intraannual variation.Interannual variation and trend,and periodicity of precipitation and runoff.The results showed that the intraannual distributions of precipitation and runoff in the basin were extremely uneven with a unimodal type.The peak values of monthly precipitation moved backwards after the 1980s.Both annual precipitation and runoff had decreased, and the trend of runoff was more significant than that of precipitation,which implied that runoff was also affected by other factors besides precipitation,such as human activities.Both precipitation and runoff sequences exhibited a cycle of abundance and drought change,and the main cycle was 12-16 years,which might be explained by sunspot cycle activity.The oscillation of runoff cycle was weaker than that of precipitation cycle after 1980s,which indicated that other factors also effected runoff generation besides precipitation.

国家自然科学基金(51509176);山西省自然科学基金(201601D021086,2016011054);山西省水文局项目（ZNGZ2015-036）