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Time–Frequency Analysis of Particulate Matter (PM 10 ) Concentration in Dry Bulk Ports Using the Hilbert–Huang Transform

Xuejun Feng, Jinxing Shen, Haoming Yang, Kang Wang, Qiming Wang and Zhongguo Zhou
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Xuejun Feng: College of Habour, Coastal and Offshore Engineering, Hohai University, No.1, Xikang Road, Nanjing 210098, China
Jinxing Shen: College of Civil and Transportation Engineering, Hohai University, No.1, Xikang Road, Nanjing 210098, China
Haoming Yang: Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science and Technology, No.219, Ningliu Road, Nanjing 210044, China
Kang Wang: College of Habour, Coastal and Offshore Engineering, Hohai University, No.1, Xikang Road, Nanjing 210098, China
Qiming Wang: College of Science, Hohai University, No.1, Xikang Road, Nanjing 210098, China
Zhongguo Zhou: College of Science, Hohai University, No.1, Xikang Road, Nanjing 210098, China

IJERPH, 2020, vol. 17, issue 16, 1-15

Abstract: To analyze the time–frequency characteristics of the particulate matter (PM 10 ) concentration, data series measured at dry bulk ports were used to determine the contribution of various factors during different periods to the PM 10 concentration level so as to support the formulation of air quality improvement plans around port areas. In this study, the Hilbert–Huang transform (HHT) method was used to analyze the time–frequency characteristics of the PM 10 concentration data series measured at three different sites at the Xinglong Port of Zhenjiang, China, over three months. The HHT method consists of two main stages, namely, empirical mode decomposition (EMD) and Hilbert spectrum analysis (HSA), where the EMD technique is used to pre-process the HSA in order to determine the intrinsic mode function (IMF) components of the raw data series. The results show that the periods of the IMF components exhibit significant differences, and the short-period IMF component provides a modest contribution to all IMF components. Using HSA technology for these IMF components, we discovered that the variations in the amplitude of the PM 10 concentration over time and frequency are discrete, and the range of this variation is mainly concentrated in the low-frequency band. We inferred that long-term influencing factors determine the PM 10 concentration level in the port, and short-term influencing factors determine the difference in concentration data at different sites. Therefore, when formulating PM 10 emission mitigation strategies, targeted measures must be implemented according to the period of the different influencing factors. The results of this study can help guide recommendations for port authorities when formulating the optimal layout of measurement devices.

Keywords: ambient particulate matter; Hilbert–Huang transform (HHT); empirical mode decomposition (EMD); intrinsic mode functions (IMF); Hilbert spectrum analysis (HSA) (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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