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Study on the Fractional Modeling of Sediment Transport in Estuarine and Coastal Waters
Pages: 101-105
Year: Issue:  2
Journal: Ocean Technology

Keyword:  estuarine and coastal waterssediment transportfractional modelbed evolutionhydrodynamics;
Abstract: A new two-dimensional fractional numerical model is established in this paper to simulate the hydrodynamics and graded sediment transport process in estuarine and coastal waters. The model is coupled by the hydrodynamic module, sediment transport module and bed evolution module. The Corlioli effect, bed shear and wind shear are introduced in the hydrodynamic module and the wetting-drying method is adopted to deal with the moving boundary. The sediment mixture is divided into several fractions according to the grain size and each fraction is simulated separately in the sediment transport module. Based on the mass conservation equation, the processes of bed elevation change and sediment grain size sorting are simulated in a real-time way in the bed evolution module, and the data are transferred to the hydrodynamic module immediately to renew the bottom boundary. The model has been applied in the Bristol Channel and Severn estuary in the UK. The predictions by the present model are compared with the field data and those by the single-fraction model. The results show that the present model predictions have better compliance with the field data than the non-fractional model results.
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