ANALYSIS OF TEMPORAL VARIATIONS IN TURBIDITY FOR A COASTAL AREA USING THE HILBERT-HUANG-TRANSFORM

Shigeru Kato; Magnus Larson; Takumi Okabe; Shin-ichi Aoki

doi:10.9753/icce.v32.sediment.25

No. 32 (2010), Sediment Transport and Morphology

No. 32 (2010)

ANALYSIS OF TEMPORAL VARIATIONS IN TURBIDITY FOR A COASTAL AREA USING THE HILBERT-HUANG-TRANSFORM

Sediment Transport and Morphology

https://doi.org/10.9753/icce.v32.sediment.25

Published 2011-01-19

Shigeru Kato⁺⁻
Magnus Larson⁺⁻
Takumi Okabe
Shin-ichi Aoki

Shigeru Kato

Toyohashi University of Technology

Magnus Larson

Lund University

Takumi Okabe

Shin-ichi Aoki

Proceedings of the 32nd International Conference

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Keywords

Hilbert-Huang Transform
instantaneous frequency
turbidity
Hilbert spectrum

How to Cite

Kato, S., Larson, M., Okabe, T., & Aoki, S.- ichi. (2011). ANALYSIS OF TEMPORAL VARIATIONS IN TURBIDITY FOR A COASTAL AREA USING THE HILBERT-HUANG-TRANSFORM. Coastal Engineering Proceedings, 1(32), sediment.25. https://doi.org/10.9753/icce.v32.sediment.25

Abstract

Turbidity data obtained by field observations off the Tenryu River mouth were analyzed using the Hilbert-Huang Transform (HHT) in order to investigate the characteristic variations in time and in the frequency domain. The Empirical Mode Decomposition (EMD) decomposed the original data into only eight intrinsic mode functions (IMFs) and a residue in the first step of the HHT. In the second step, the Hilbert transform was applied to the IMFs to calculate the Hilbert spectrum, which is the time-frequency distribution of the instantaneous frequency and energy. The changes in instantaneous frequencies showed correspondence to high turbidity events in the Hilbert spectrum. The investigation of instantaneous frequency variations can be used to understand transitions in the state of the turbidity. The comparison between the Fourier spectrum and the Hilbert spectrum integrated in time showed that the Hilbert spectrum makes it possible to detect and quantify the cycle of locally repeated events.

https://doi.org/10.9753/icce.v32.sediment.25

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References

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ANALYSIS OF TEMPORAL VARIATIONS IN TURBIDITY FOR A COASTAL AREA USING THE HILBERT-HUANG-TRANSFORM

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