Analysis of wave spectrum by Blackman-Tukey method and fast fourier method

Hoa Tien Le Nguyen; Dung Tran Xuan; Hao Lam Van; Thanh Nguyen Tien; Phong Nguyen Hoang; Hong Phuoc Vo Luong

doi:10.15625/1859-3097/15114

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Authors

Hoa Tien Le Nguyen University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
Dung Tran Xuan University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
Hao Lam Van University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
Thanh Nguyen Tien University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
Phong Nguyen Hoang University of Science, Vietnam National University, Ho Chi Minh City, Vietnam
Hong Phuoc Vo Luong University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0003-0853-2258

DOI:

https://doi.org/10.15625/1859-3097/15114

Abstract

Energy of surface waves is almost dissipated as propagating from shallow water to muddy flat and in mangrove forest. The study aims to analyze energy spectral density by using Blackman-Tukey (BT) and Fast Fourier Transform (FFT) methods in order to analyze the wave energy in mangrove areas in Cu Lao Dung (Soc Trang province). BT method is easy to use especially in short time series. Selection of lag number m is very important to determine the energy amount and number of peaks. Whereas, FFT method helps us to analyze the shift of spectral energy as waves propagate into shallower water. The results show that wave energy is dissipated from shallow water to muddy flat and into mangrove forests. The spectral energy shifts from low frequency to higher frequency as propagating into mangrove forests. This can prove the non-linear characteristics of waves in mangrove forests and the complicated hydrodynamic processes in mangrove forests.

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References

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