基于EEMD的验潮站水位序列降噪方法  

EEMD-based de-noising method of tide gauge station water level sequence

作　　者：戴国强 沈友东 贺小星 DAI Guoqiang;SHEN Youdong;HE Xiaoxing(Jiangxi Province Institute of Water Sciences,Nanchang 330029,China;School of Architectural Engineering,Jiujiang Vocational and Technical College,Jiujiang 332007,China;School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西省水利科学院,江西南昌330029 [2]九江职业技术学院建筑工程学院,江西九江332007 [3]江西理工大学土木与测绘工程学院,江西赣州341000

出　　处：《海洋测绘》2022年第2期1-5,共5页Hydrographic Surveying and Charting

基　　金：江西省数字国土重点实验室开放基金(DLLJ201909);江西省水工安全工程技术研究中心开放研究基金(2020GGCZX04);江西理工大学高层次人才科研启动项目(205200100564);江西省教育厅科学技术研究项目(GJJ204015,GJJ200639)。

摘　　要：验潮站水位序列是研究海平面变化的重要基础数据,针对验潮站水位序列中夹杂的噪声对海平面变化速度估计的负面影响,提出一种基于整体经验模态分解方法(EEMD)的降噪新方法。该方法通过EEMD进行水位序列分解,并以相关系数进行高频噪声与低频信号分离,以提高验潮站水位序列速度估值的确定精度。通过对美国西海岸的10个长期验潮站进行实验分析,实验结果表明经本文所提出的方法降噪后的验潮站水位序列能清晰地反映站点长期的变化趋势,其海平面变化速度不确定度平均减小0.122 mm/年,并且在较高纬度地区效果更为显著。The tide gauge station water level sequence is an important basic data for the study of sea level change.Aiming at the negative impact of noise included in the tide gauge station water level sequence on the estimation of sea level change velocity,this paper proposes a method based on the ensemble empirical mode decomposition(EEMD)New method of noise reduction.This method uses EEMD to decompose the water level sequence,and separates the high-frequency noise and low-frequency signal with the correlation coefficient,to improve the accuracy of determining the speed estimation of the water level sequence at the tide gauge station.Through experimental analysis of 10 long-term tide gauge stations on the w est coast of the United States,the experimental results show that the tide gauge station water level sequence after noise reduction by the method proposed in this paper can clearly reflect the long-term change trend of the station,and the uncertainty of sea level change velocity is reduced by 0.122 mm/a on average.The effect is more significant in higher latitudes.

关 键 词：验潮站水位序列 海平面变化速度 整体经验模态分解 降噪分析 速度不确定度 

分 类 号：P229.7[天文地球—大地测量学与测量工程]