Author(s): J. L. M. P. De Lima; J. R. C. B. Abrantes
Linked Author(s):
Keywords: Thermal tracer; Overland flow velocity; Laboratory experiments
Abstract: Overland flow velocity is a basic hydraulic parameter and its precise calculation is essential for many applications in surface hydrology. This study proposes a technique based on a thermal tracer to estimate overland flow space-averaged velocities. Experiments were conducted to compare the dye tracer technique with this new thermal tracer technique, based on infrared thermography, by injecting a combined tracer (heated dye) into the flow. Results show that thermal tracers are useful, since measurements are similar to those resulting from using dye tracers. This technique measures the flow velocity in a cleaner way, without leaving any residue in the water or the soil and with negligible temporal and spatial disturbance of the environment.
Year: 2014