This paper reports on a laboratory study in which the automatic digital photogrammetric surveyudwas applied to derive the high-resolution Digital Surface Model (DSM) of the bed topography, usedudfor the flow-bed interactions analysis, in a large amplitude meandering laboratory flume. Theudanalysis has been conducted with the aid of detailed data of three-dimensional flow field previouslyudcollected using the acoustic Doppler velocity profiler DOP2000. The applied surveying procedureudhas allowed the evaluation of the DSM with a resolution of ±0.5 mm. The detailed DSM has beenudcompared with peculiar maps describing the flow velocity pattern (downstream and the crossstreamudflows) and the shear velocity distribution along the meandering flume. The comparison hasudhighlighted that high quality topographic data are of crucial importance to evaluate the crosscirculationudeffect on the redistribution of the velocity and boundary shear stress and, thereby, onudthe meandering channel evolution.
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