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Flow-bed interactions analysis and application of automatic close range digital photogrammetric survey in a laboratory flume


Donatella Termini[1], Mauro Lo Brutto[2]
Page No. 175-189 


Abstract

This paper reports on a laboratory study in which the automatic digital photogrammetric survey
was applied to derive the high-resolution Digital Surface Model (DSM) of the bed topography, used
for the flow-bed interactions analysis, in a large amplitude meandering laboratory flume. The
analysis has been conducted with the aid of detailed data of three-dimensional flow field previously
collected using the acoustic Doppler velocity profiler DOP2000. The applied surveying procedure
has allowed the evaluation of the DSM with a resolution of ±0.5 mm. The detailed DSM has been
compared with peculiar maps describing the flow velocity pattern (downstream and the crossstream
flows) and the shear velocity distribution along the meandering flume. The comparison has
highlighted that high quality topographic data are of crucial importance to evaluate the crosscirculation
effect on the redistribution of the velocity and boundary shear stress and, thereby, on
the meandering channel evolution.
Keywords: meandering channels; bed topography; erosion; flow pattern; laboratory flumes; close
range photogrammetry


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