Measurement of Evaporation on Bare Soil and Estimating Surface Resistance
Publication: Journal of Environmental Engineering
Volume 129, Issue 12
Abstract
A new evaporation measuring device incorporating an evaporation chamber has been developed and checked for its accuracy. This device is unique that it uses a chamber that is completely open at one end and thereby minimizes the effect of the chamber on the natural profiles of temperature, humidity, and turbulence. It was used in estimating a newly formulated surface resistance to bare soil evaporation under dry topsoil conditions. A simple energy balance model incorporating the depth of evaporating surface, blended with a new approach for describing surface resistance was developed and successfully tested with a limited set of data obtained from a simple experiment, assuming ideal conditions. In addition to the newly formulated surface resistance, the depth of the dry soil layer was also estimated and was relatively comparable with measured value. The newly formulated surface resistance was found to be insignificant compared to the resistance imposed by the dry soil layer. The total surface resistance was modeled as a power function of soil moisture in the top 0–1 cm of soil, while the newly formulated resistance did not show any relation with the soil moisture.
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Information
Published In
Journal of Environmental Engineering
Volume 129 • Issue 12 • December 2003
Pages: 1157 - 1168
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jan 22, 2001
Accepted: Jul 3, 2002
Published online: Nov 14, 2003
Published in print: Dec 2003
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