IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 33rd Congress - Vancouver (2009) : Topic A: Advances in the Fundamentals of Water Science and Engineering : Thermal imaging for discharge and velocity measurements in open channels
Thermal imaging for discharge and velocity measurements in open channels
Author : E. Jackson, D. Admiraal, D. Alexander, J. Stansbury, J. Guo, D. Rundquist, and M. Drain
Thermal imaging cameras are powerful tools for measuring the temperature distributions on the surfaces of water bodies. The velocity distribution of a water surface can also be determined by recording the motion of the water surface temperature distribution with a thermal imaging camera and then applying particle image velocimetry (PIV) methods to sequential thermal images to obtain the velocity distribution. In this paper we discuss field and laboratory measurements of velocity distributions in open channel flows using a thermal imaging camera. The laboratory measurements are relatively simple comparisons of measured and calculated velocities for flows in a 71-cm wide channel with actively heated water surfaces. The field measurements include measurements of water velocity in a large power canal from an oblique camera angle with variations in image resolution. The oblique images are rectified and analyzed to determine velocities in the canal. The surveying and rectification processes are described in the paper, and resulting velocity measurements are presented. None of the field measurements of velocity distributions utilize active heating of the water surface.
File Size : 345,334 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 33rd Congress - Vancouver (2009)
Article : Topic A: Advances in the Fundamentals of Water Science and Engineering
Date Published : 09/08/2009
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