基于小波阈值降噪-EEMD分解的潮汐河网地区纳潮引水调度周期研究

Research on Scheduling Period of Tide Raising and Water Diversion for Tidal River Network Based on Wavelet Threshold Denoising-EEMD Method

鉴于在分析纳潮引水方案时,基于潮位周期变化规律的典型潮位过程选取难度较大,将小波阈值降噪与EEMD信号处理方法引入潮位特征分析中,结合径流量变化影响分析、端点效应消除及周期合理性检验等,提出基于小波阈值降噪-EEMD分解的潮汐河网地区纳潮引水调度周期识别方法。对福州市南台岛纳潮引水调度周期的分析结果表明,南台岛纳潮引水调度周期为14d,利用小波阈值降噪-EEMD分解法提取潮汐河网地区纳潮引水调度周期合理可行。

In view of the analysis of tide raising and water diversion scheme,the typical tidal level process based the tidal cycle variation law is difficult to be selected.The wavelet threshold denoising and EEMD signal processing method were introduced to tidal characteristics analysis.Combined with the analysis of the characteristics of runoff variation,endpoint effect elimination and periodic rationality test,the paper proposed a method,which is based on the wavelet threshold denoising and EEMD,to identify the scheduling period of tide raising and water diversion.The analysis results of the Nantai Island tide diversion scheduling period in Fuzhou City show that the scheduling period of tide raising and water diversion in the Nantai Island are 14 days.The rationality and feasibility of this method were verified by the example analysis.