Fourier decomposition of multi-scale sand wave fields on the Taiwan Banks

Zhu Chao; Wu Ziyin; Zhou Jieqiong; Yang Fanlin; Zhao Dineng; Liu Yang; Lu Haohao

doi:10.3969/j.issn.0253-4193.2019.09.013

Volume 41 Issue 9

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Zhu Chao，Wu Ziyin，Zhou Jieqiong, et al. Fourier decomposition of multi-scale sand wave fields on the Taiwan Banks[J]. Haiyang Xuebao，2019, 41(9)：136–144，doi:10.3969/j.issn.0253−4193.2019.09.013

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Fourier decomposition of multi-scale sand wave fields on the Taiwan Banks

doi: 10.3969/j.issn.0253-4193.2019.09.013

Zhu Chao^{1, 2, 3, 4
,},
Wu Ziyin^{2, 3, 4, 5
,
,},
Zhou Jieqiong^{2, 3, 5},
Yang Fanlin¹,
Zhao Dineng^{2, 3},
Liu Yang^{2, 3},
Lu Haohao^{2, 3, 6}

1.
College of Geomrtics, Shandong University of Science and Technology, Qingdao 266590, China
2.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
3.
Key Laboratory of the Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China
4.
Ocean College, Zhejiang University, Zhoushan 316021, China
5.
School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
6.
School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China

Received Date: 2018-10-29
Rev Recd Date: 2019-03-18

Available Online: 2021-04-21

Publish Date: 2019-09-25

Abstract

Abstract

Sand waves are widely distributed in the world and have complex genesis. And multi-scale complex sand waves often overlap to form a complex sand wave geomorphology system, which makes it difficult to conduct quantitative research. To solve this problem, a practical Fourier analysis method is proposed in this paper, and Butterworth filter is designed to transform water depth data into frequency domain, and then decompose complex sand wave geomorphology into a series of single types of sand waves in different frequencies. Taking the complex sand wave geomorphology system of Taiwan Banks as an example, three spatial scales of sand waves are quantitatively decomposed, which are: giant sand waves (over 100 m in length, over 5 m in height), medium sand waves (wavelength of 5–100 m, wave height of 0.4–5 m) and sand ripples (wavelength less than 5 m, wave height less than 0.4 m). The quantitative analysis method of sand waves proposed in this paper is helpful to study the genesis and mechanism of sand waves in different scales, and is also of practical value to the safety assessment of marine engineering in sand wave fields.
- submarine sand waves,
- Fourier analysis,
- multi-scale decomposition,
- Taiwan Banks,
- multi-beam echo sounding

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References(40)

References

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