Bottom sediment transport in the western Laizhou Bay during strong wind events based on a tripod measurement

Li Hai; Wan Kai; Song Xin; Song Dehai; Wang Nan; Bao Xianwen

doi:10.12284/hyxb2022041

Volume 44 Issue 6

Jul. 2022

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Li Hai，Wan Kai，Song Xin, et al. Bottom sediment transport in the western Laizhou Bay during strong wind events based on a tripod measurement[J]. Haiyang Xuebao，2022, 44(6)：68–79 doi: 10.12284/hyxb2022041

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Bottom sediment transport in the western Laizhou Bay during strong wind events based on a tripod measurement

doi: 10.12284/hyxb2022041

Li Hai^{1, 2, 3
,},
Wan Kai⁴,
Song Xin⁵,
Song Dehai^{1, 2
,
,},
Wang Nan³,
Bao Xianwen^{1, 2, 3}

1.
Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China
2.
Laboratory for Ocean Dynamics and Climate, Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266237, China
3.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
4.
Beihai Offshore Engineering Survey Institute, State Oceanic Administration, Qingdao 266061, China
5.
Weifang Marine Development Research Institute, Weifang 261100, China

Received Date: 2021-05-19
Rev Recd Date: 2021-10-11

Available Online: 2022-07-13

Publish Date: 2022-07-13

Abstract

Abstract

Based on a tripod measurement in the Laizhou Bay from October 21 to November 6, 2018, the unit-width bottom sediment transport rate and the effects of strong winds on bottom sediment transport are analyzed using the ensemble empirical mode decomposition, the Hilbert-Huang transform and the wavelet analysis method. The resuluts show thta the unit-width sediment transport rate can be divided into four intrinsic mode functions with increased periods including the high-frequency, tidal-period, low-frequency and long-period. The high-frequency and tidal-period components have the highest variance contribution rate and energy, indicating their greatest impact on sediment transport. The marginal spectrum shows a significant period of 13.3 h in the east-west direction, and a period larger than 11 h in the north-south direction. The net bottom sediment fluxes in the east-west and north-south directions are 305.77 kg/m and 597.25 kg/m, respectively; and the high-frequency and low-frequency component contribute least while the residual-current component contributes most. Winds work on the time-frequency distribution of the unit-width sediment transport rate mainly through the turbulence and waves during the wind decrease periods, which enhances the low-frequency domain significantly, and further induces the high-frequency fluctuations with periods about 1 h. The cross-wavelet analysis shows the winds and the unit-width sediment transport rate have a strong coherence on the low-frequency band; and the latter lags behind the former by 1/4 to 1/2 period. In addition, the wind-waves enhance the asymmetric sediment transport between flood and ebb tidal phase, which increases the net sediment flux of tidal period.
- unit-width sediment transport rate,
- net sediment flux,
- ensemble empirical mode decomposition,
- HHT time-frequency analysis,
- cross-wavelet analysis

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References(20)

References

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