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Position: Home > Articles > Multiscale Analysis of the Precipitation Time Series in Dafeng District of Yancheng City Based on EEMD Journal of Anhui Agricultural Sciences 2016 (10) 209-211+225

基于EEMD的盐城大丰区降水量时间序列多尺度分析

作  者：
陈超;李鹏飞;陈尚云;陈凯;陈则煌
单  位：
江苏省盐城市大丰区气象局;中国气象局气溶胶与云降水重点开放实验室
关键词：
年降水量;时间序列;EEMD;Hilbert变换;显著性检验;盐城大丰地区
摘  要：
[目的]研究盐城大丰地区年降水量时间序列规律。[方法]基于集合经验模态分解(EEMD)的数据处理方法,通过Hilbert变换对降水量数据进行多尺度特征研究,并对研究结果进行显著性和误差检验。[结果]近55 a盐城大丰地区年降水量序列可以分解成4个IMF分量和1个趋势分量;主要存在0~0.05和0.45~0.50 Hz 2个频率区间,其间主周期为2.12 a年际周期和27.50 a年代际周期,二者均通过95%显著性检验。EEMD可以有效地重构原始降水量数据变化曲线,与原始数据对比误差百分比始终控制在±0.6%范围内,由白噪声带来的干扰误差几乎可以完全忽略。[结论]该研究可为合理开发与充分利用水文资源、防汛抗旱等提供科学依据。
译  名：
Multiscale Analysis of the Precipitation Time Series in Dafeng District of Yancheng City Based on EEMD
作  者：
CHEN Chao;LI Peng-fei;CHEN Shang-yun;Dafeng District Meteorological Bureau;Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration;College of Atmospheric Physics,Nanjing University of Information Science & Technology;
关键词：
Annual precipitation;;Time series;;EEMD;;Hilbert transform;;Significance test;;Dafeng District in Yancheng City
摘  要：
[Objective] To research the precipitation time series in Dafeng District of Yancheng City. [Method] Based on the data treatment method of ensemble empirical mode decomposition( EEMD),multi-scale characteristics research of precipitation data were researched by Hilbert transform. Significance and error tests on research results were carried out. [Result] The sequence of annual precipitation of Dafeng District in recent 55 years could be broken down into four IMF( Intrinsic Mode Function) components and a trend component. There were mainly two frequency regions,which were 0- 0. 05 Hz and 0. 45- 0. 50 Hz. The annual cycle was 2. 12 years and the decadal cycle was 27. 50 years during the main period. Both of them passed the 95% significance test. EEMD precipitation could effectively reconstruct the curve of original data. Compared with the original data,error percentage was always controlled within ± 0. 6%. Then the interference error by the white noise could be almost completely ignored. [Conclusion]This research provides scientific basis for the rational development and fully utilization of hydrologic resources,flood control and drought relief.

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