In this paper results of sensitivity studies and calibration of a sediment transportrnmodel are summarised. The investigation area is located on the German Wadden Sea betweenrnthe Elbe and Eider estuaries. Field data obtained from measuring campaigns adapted to providerndata for evaluating the performance of numerical models was used. Process-based twodimensionalrndepth-integrated models for the simulation of currents, waves and sedimentrntransport were coupled. The sediment transport model solves the convection-diffusion inrnconjunction with the algebraic equations proposed by Bijker and Van Rijn. Sensitivity studiesrnwith respect to particle sizes, coefficients in the algebraic equations and bed roughness wererncarried out. Different approaches were used for calibration of the model. Results show thernimportance of measurement data to achieve high-accuracy predictions. The sediment transportrnmodel is capable of predicting the suspended sediment concentration within the order ofrnmagnitude of the observed values. The bed roughness was found to be a key element in thernestimation of the suspended sediment concentrations. The consideration of variable bedrnroughness in time and space is found to improve the predictive ability of the sediment transportrnmodel.
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