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Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer
SPAR
kr 143
Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer

The evolution and utilization of estuarine and coastal regions are greatly restricted by sediment problems. This thesis aims to better understand fine sediment transport under combined action of waves and currents, especially in the wave-current bottom boundary layer (BBL). Field observations, experimental data analysis, theoretical analysis and numerical models are employed. Silt-dominated sediments are sensitive to flow dynamics and the suspended sediment concentration (SSC) increase rapidly under strong flow dynamics. This research unveils several fundamental aspects of silty sediment, i.e., the criterion of the incipient motion, the SSC profiles and their phase-averaged parameterization in wave-dominated conditions. An expression for sediment incipient motion is proposed for silt-sand sediment under combined wave and current conditions. A process based intra-wave 1DV model for flow-sediment dynamics near the bed is developed in combined wave-current conditions. The high concentration layer (HCL) was simulated and sensitivity analysis was carried out by the 1DV model on factors that impact the SSC in the HCL. Finally, based on the 1DV model, the formulations of the mean SSC profile of silt-sand sediments in wave conditions were proposed. The developed approaches are expected to be applied in engineering practice and further simulation.

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The evolution and utilization of estuarine and coastal regions are greatly restricted by sediment problems. This thesis aims to better understand fine sediment transport under combined action of waves and currents, especially in the wave-current bottom boundary layer (BBL). Field observations, experimental data analysis, theoretical analysis and numerical models are employed. Silt-dominated sediments are sensitive to flow dynamics and the suspended sediment concentration (SSC) increase rapidly under strong flow dynamics. This research unveils several fundamental aspects of silty sediment, i.e., the criterion of the incipient motion, the SSC profiles and their phase-averaged parameterization in wave-dominated conditions. An expression for sediment incipient motion is proposed for silt-sand sediment under combined wave and current conditions. A process based intra-wave 1DV model for flow-sediment dynamics near the bed is developed in combined wave-current conditions. The high concentration layer (HCL) was simulated and sensitivity analysis was carried out by the 1DV model on factors that impact the SSC in the HCL. Finally, based on the 1DV model, the formulations of the mean SSC profile of silt-sand sediments in wave conditions were proposed. The developed approaches are expected to be applied in engineering practice and further simulation.

Produktdetaljer
Sprog: Engelsk
Sider: 188
ISBN-13: 9781138334687
Indbinding: Paperback
Udgave:
ISBN-10: 1138334685
Kategori: Vandforsyning
Udg. Dato: 18 jul 2018
Længde: 16mm
Bredde: 170mm
Højde: 239mm
Oplagsdato: 18 jul 2018
Forfatter(e) Liqin (UNESCO-IHE Institute for Water Education Zuo, Liqin Zuo


Kategori Vandforsyning


Sprog Engelsk


Indbinding Paperback


Sider 188


Udgave


Længde 16mm


Bredde 170mm


Højde 239mm


Udg. Dato 18 jul 2018


Oplagsdato 18 jul 2018

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