Abstract
This paper investigates the flow and bed deformation around groins under flood conditions in a river restoration project with both experimental and numerical methods. The experiments are based on a large-scale physical model and are able to resolve the local flow and sediment transport phenomena with a relatively high accuracy. The numerical models are formulated on an unstructured mesh and allow the exact representation of complex geometries, in particular the restoration structures such as groins. The numerical results have been compared with those of the experimental measurements. Reasonable agreements have been obtained in terms of both flow patterns and bed variations. The study suggests that the flood had significant impacts on the bed morphologies with quantitative evidences. The numerical models may serve as a promising tool for the decision-making and post-assessment in river restoration.
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