Study on the semi-diurnal tides-induced movement features of suspended sediment and the influencing factors

Zhu Zichen; Zhang Wanjun; Hu Zejian; Liu Jianqiang; Xiong Congbo

doi:10.3969/j.issn.0253-4193.2019.06.004

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Zhu Zichen, Zhang Wanjun, Hu Zejian, Liu Jianqiang, Xiong Congbo. Study on the semi-diurnal tides-induced movement features of suspended sediment and the influencing factors[J]. Haiyang Xuebao, 2019, 41(6): 37-47. doi: 10.3969/j.issn.0253-4193.2019.06.004

Citation:

Zhu Zichen, Zhang Wanjun, Hu Zejian, Liu Jianqiang, Xiong Congbo. Study on the semi-diurnal tides-induced movement features of suspended sediment and the influencing factors[J]. Haiyang Xuebao, 2019, 41(6): 37-47. doi: 10.3969/j.issn.0253-4193.2019.06.004

Citation:

Zhu Zichen, Zhang Wanjun, Hu Zejian, Liu Jianqiang, Xiong Congbo. Study on the semi-diurnal tides-induced movement features of suspended sediment and the influencing factors[J]. Haiyang Xuebao, 2019, 41(6): 37-47. doi: 10.3969/j.issn.0253-4193.2019.06.004

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Study on the semi-diurnal tides-induced movement features of suspended sediment and the influencing factors

doi: 10.3969/j.issn.0253-4193.2019.06.004

First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China

Received Date: 2018-03-02
Rev Recd Date: 2018-07-11

Abstract

Abstract

To study the sediment movement characteristics in a tidal channel, an one-dimensional depth-averaged suspended sediment concentration (SSC) model is established including advection, resuspension and deposition as main physical processes. The hydrodynamic force contains M₂ and S₂ tides. The model was applied in Meizhou Bay, in which tide, current, SSC and the sediment were measured or sampled in August, 2007. And the model was validated by the observation data. Suspension was decomposed into 12 primary terms by Fourier analysis, including (1) a demisemi-diurnal term induced by M₂ tide with an angular velocity of the overtide of M₂, (2) a demisemi-diurnal term induced by the combined action of M₂ and S₂ tides with an angular velocity of the sum of the angular velocities of M₂ and S₂, and (3) a semi-diurnal term induced by the combined action of horizontal suspension concentration gradient, residual current and M₂ tide, with an angular velocity same to that of M₂ tide. The time average of SSC is mainly controlled by residual current, horizontal gradient of suspension concentration, M₂ tidal current, and the incipient condition of sediment. The residual current could cause the asymmetry of suspension between the adjacent periods. The feature of SSC curve is controlled by the sediment parameters which reflect the sediment characteristics. The deposition parameters influence both the phase and the amplitude of SSC. The resuspension parameters only influence the amplitude of SSC, nor did the phase.
- suspended sediment,
- Trigonometric Fourier analysis,
- resuspension,
- M₂ partial tide,
- S₂ partial tide,
- residual current

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References(20)

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