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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Geometric and hydraulic assessment of the accuracy of a bed moulding technique
Geometric and hydraulic assessment of the accuracy of a bed moulding technique
Author : CHRISTY USHANTH NAVARATNAM(1), JOCHEN ABERLE(2) , STEPHAN SPILLER(3)
nts preliminary results from an experimental study aiming at the investigation of the significance of bed
porosity on surface flow characteristics in gravel beds. In order to quantify this influence, hydraulic measurements need
to be conducted over permeable beds and their impermeable counterparts having the identical surface structure. Recent
developments in experimental techniques have resulted in innovative casting methods which can be used to reproduce
such surfaces with high accuracy. In the present study, we used a liquid two-component silicone rubber to manufacture
a negative imprint of granular and artificial beds. The corresponding surfaces were subsequently reproduced from the
silicon form using a two-component pouring resin. The accuracy of the applied moulding technique is evaluated based
on a geometrical analysis of the surface structures of the prototype surfaces and their moulded counterparts. Moreover,
preliminary results from hydraulic measurements using a 2D-Particle Image Velocimetry (PIV) system are presented for
a surface consisting of a layer of original and duplicate golf balls. The corresponding measurements were, using
identical hydraulic boundary conditions, carried out for two water depths. The obtained data are analyzed using the
double averaging methodology and are used to investigate the accuracy of the moulding technique in hydraulic terms by
comparing the near bed flow structure and turbulence characteristics over the original and artificially reproduced surface,
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 27/08/2015
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