Developing the wave-current-microtopography coupled model of sediment dynamics and its applications

Lu Jing; Xia Changshui; Teng Yong; Liu Xuehai

doi:10.3969/j.issn.0253-4193.2017.07.002

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Lu Jing, Xia Changshui, Teng Yong, Liu Xuehai. Developing the wave-current-microtopography coupled model of sediment dynamics and its applications[J]. Haiyang Xuebao, 2017, 39(7): 12-25. doi: 10.3969/j.issn.0253-4193.2017.07.002

Citation:

Lu Jing, Xia Changshui, Teng Yong, Liu Xuehai. Developing the wave-current-microtopography coupled model of sediment dynamics and its applications[J]. Haiyang Xuebao, 2017, 39(7): 12-25. doi: 10.3969/j.issn.0253-4193.2017.07.002

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Developing the wave-current-microtopography coupled model of sediment dynamics and its applications

doi: 10.3969/j.issn.0253-4193.2017.07.002

1.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;Key Lab of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
Key Lab of Marine Science and Numerical Modeling, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

Received Date: 2016-10-14
Rev Recd Date: 2016-12-13

Abstract

Abstract

Ripple microtopography prevalently exist on coastal beds, which significantly change the bottom stress and then influence the sediment transport. Previous researchers mainly study the wave-dominant ripples and have applied them to the wave modelling. Wave-current combined flow is rarely discussed to generate ripples, and the combined flow-dominant ripples are rarely implemented to hydrodynamic and sediment models. We embedded the University of New South Wales sediment model into the POM model, and connected them with a wave-current interaction bottom boundary model coupled with a microtopography module under combined flow. We developed a wave-current-microtopography coupled model of sedimentology dynamics, and applied this coupled model to Jervis Bay, Australia. Developing stages and types are modeled, and the ripple height and length are simulated. The suspended sediment transport was analyzed under wave-dominant and combined flow separately. Simulated results show that the wave-dominant ripples have longer height and length. Therefore, ripples place an important role on suspended sediment when waves dominate. Through considering roughness that varies with microtopography, this model can predict the abrupt rising of suspended sediment concentration rather than setting an average uniform roughness.
- sediment dynamical model,
- wave-current coupling,
- microtopography,
- ripples,
- bottom boundary layer,
- roughness,
- suspended sediments

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References(31)

References

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