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Instantaneous sediment transport model for asymmetric oscillatory sheet flow
Xin Chen1, Yong Li2, Genfa Chen3
1Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing, China.
Plos One
|December 23, 2017
Summary
A new analytical model accurately predicts sediment transport in asymmetric oscillatory flow. It accounts for factors like suspended sediment and phase-lag, improving predictions for net transport rates, especially offshore.
Area of Science:
- Coastal Engineering
- Fluid Dynamics
- Sedimentology
Background:
- Sediment transport in oscillatory flow is complex, influenced by wave asymmetry and seabed conditions.
- Existing models often struggle to accurately predict net sediment transport, particularly under skewed flow conditions.
Purpose of the Study:
- To develop an instantaneous analytical model for sediment transport in asymmetric oscillatory flow.
- To incorporate advanced concentration and velocity profiles, including phase-lag and boundary layer effects.
Main Methods:
- Derived an analytical model based on mass conservation and turbulent boundary layer theory.
- Integrated classical exponential concentration profiles and asymmetric velocity profiles.
- Incorporated erosion depth, free stream velocity, phase-lead, and boundary layer thickness.
Main Results:
- The model simplifies to classical empirical models (Shields parameter power 3/2) under certain conditions.
- It accurately predicts instantaneous transport rates, accounting for phase-lag and sediment size.
- Successfully predicts net transport rates, including offshore transport under skewed flows, where other models fail.
Conclusions:
- The developed model provides a unified framework for instantaneous sediment transport rates.
- It highlights the significant impact of suspended sediment, phase-lag, and boundary layer asymmetry on net transport.
- Offers improved predictive capabilities for coastal engineering applications.
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