采用Morlet小波分析方法,对852农场1958~2008年51 a的年降水变化进行多尺度分析,分析其中存在的主要周期振荡和突变点。结果表明:该农场年降水存在多时间尺度的周期变化特征,年降水存在3 a和9 a的主周期。852农场年降水变化存在着明显的多时间尺度,即年代际尺度和年际尺度的周期性变化。同时也表明,自2008年以来,852农场降水量有逐渐增多的趋势。因此,可以充分利用降水,缓解地下水资源危机。
Through analyzing the time series of annual precipitation of Farm 852 from 1958-2008 with Morlet wavelet,the multi-time scale structure and mutation points in precipitation change are revealed.The results showed precipitation series of Farm 852 had four main periods which were 3 and 9 years around,and the annual precipitation of Farm 852 had phasic and mutational characteristics.After 2008,the annual precipitation of Farm 852 was in the wet period.Therefore,the precipitation can be used fully and the groundwater crisis can be relieved.