Abstract
This research presents recent advances on morphodynamic modelling over gravel dunes. Boundary-layer separation over gravel fixed dunes is investigated by particle image velocimetry (PIV) and acoustic Doppler velocimetry (ADV). Using the measurements of flow over dunes for different conditions at laboratory scale, advantages of PIV application are investigated for the flow pattern in the lee angle of 38 degree. To compare the experimental results with numerical models over dunes, the 3D numerical model (SSIIM) is applied in this study. The results reveal that the numerical model successfully simulate flow over dune compared with PIV data. Although ADV application near the bed indicates weak performance for high discharge and low water depth, PIV results present more agreement with the numerical model in this region.
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