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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Stream gauging by combined use of surface ptv and cfd techniques in channel flows
Stream gauging by combined use of surface ptv and cfd techniques in channel flows
Author : SIAMAK GHARAHJEH, ISMAIL AYDIN
ABSTRACT
A video imagery technique for free surface velocity measuring is presented and used to calculate discharge for uniform
open channel flows numerically. When the surface velocities are measured and used as boundary conditions on the
water surface, velocity field can then be solved numerically to satisfy the surface boundary conditions. This approach
can provide a precise tool for velocity field, discharge and boundary shear distribution calculation. PTV or particle
tracking velocimetry is implemented over the free surface to provide the boundary condition for numerical solution.
Present paper describes the limitations and capabilities of conducting PTV measurements for a variety of flow
conditions. Sensitivity of the PTV measurements is investigated for different lighting conditions, time interval between
successive frames, location of the tracking particle, size and material of the particle with respect to changing free surface
velocity. Finally, the measured surface velocity are compared to the computed ones.
File Size : 1,050,176 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 28/08/2015
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