基于经验模态分解的HHT变换解析洪水频域特性

Study on Frequency Domains of Flood by Using Empirical Mode Decomposition and HHT

依据经验模态分解的希尔伯特黄变换方法,解析洪水过程的频域特性.以武江流域为研究对象,选取6场洪水过程进行分析.结果表明6场洪水在整个洪水过程中,洪水时间序列的能量主要集中在0.1 Hz以内.洪水时间序列具有多能量组分的特点.EMD分解出的分量具有较清晰的物理意义和自适应性;由于采用三次样条插值来获得信号的瞬时平均值,导致Hilbert-Huang变换得到的结果会出现端点飞翼现象.

According to the empirical mode decomposition and HHT, this paper analysis the flood process. The six floods processes have been study on the Wujiang River. The results showed that： the flood energy has concentrated in 0. 1 Hz. And floods showed flood time series have more energy components characteristics. All components, which has decomposed by EMD method, have a clearer physical meaning. The signal instantaneous average, which can be obtain by 3 - spline interpolation, brought endpoint winger phenomenon.