摘要
利用成都市1981～2010年降水资料,对成都市近30年降水时间变化量特征进行分析.得到:降水量整体呈略微下降趋势,特别是近十年下降速率加快;降水时间序列存在三个时间尺度的主周期变化,分别为6a、12a和19.5a,其中振荡能量最强大的主周期是19.5a.
By use of the recent 30 years＇ precipitation data of Chengdu from 1981 to 2010, an analysis is made of the time change feature of the precipitation time. The results show ： the overall precipitation sees a slight decreasing trend in the ar- ea under investigation, the recent ten years in particular, sees an accelerated decrease in this respect; the precipitation time se- quence exist three primary period changes at 6.5a, 12a and 19.5a respectively, of which the periodic oscillation of the 19.5a en- ergy is the most powerful.
出处
《内江师范学院学报》
2012年第6期81-83,共3页
Journal of Neijiang Normal University
关键词
成都市
降水时间序列
线性倾向
小波变换
小波方差
precipitation time sequence
linear trend
wavelet transformation
wavelet variance
