Open AccessAnalysis of wave spectrum by Blackman-Tukey method and fast fourier method
Author(s) -
Hoa Tien Le Nguyen,
Dung Tran Xuan,
Hao Lam Van,
Thanh Nguyen Tien,
Phong Nguyen Hoang,
Hong Phuoc Vo Luong
Publication year - 2021
Publication title -
vietnam journal of marine science and technology/vietnam journal of marine science and technology (vietnam academy of science and technology)
Language(s) - English
Resource type - Journals
ISSN - 1859-3097
DOI - 10.15625/1859-3097/15114
Subject(s) - mangrove , fast fourier transform , energy (signal processing) , environmental science , dissipation , spectral analysis , energy spectrum , acoustics , geology , physics , mathematics , statistics , ecology , algorithm , spectroscopy , quantum mechanics , biology , thermodynamics , nuclear physics
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.