Experimental and numerical analysis of the local scour flow field and sediment transport around a cylindrical pier

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This project aims at clarifying deficits and uncertainties in understanding and modelling the local scour development around bridge pier in mobile river beds. The focus of the investigation lies in an analysis of the flow field and its modification with increasing scour depth and in dependence of the Reynolds number. Published formulae for modeling erosion and erosion onset will be analysed. Flow fields will be simulated by space-time resolved numerical simulation (Large Eddy Simulation) and measured in a laboratory experiment by laser-based techniques (LDA, PIV). The experimental design is in line with the numerical simulations to enable the experimental results to be used for validation of the numerical ones. Thus, valid and reliable data on flow field and wall shear stresses will be obtained. By space-time analysis of these data, a link between flow field and erosion rate will be established on the local and instantaneous scale.