Simulation and Validation of Pan Evaporation Using COMSOL Multiphysics® · 2016. 11. 18. ·...
Transcript of Simulation and Validation of Pan Evaporation Using COMSOL Multiphysics® · 2016. 11. 18. ·...
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Simulation and Validation of Pan Evaporation Using
COMSOL Multiphysics®
Larry John Matel, P.E.
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Class A Evaporation Pan
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Interested Communities
•Water Resource Managers – Hydrologists
•Soil Scientists
•Agronomists
•Meteorologists
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Common Equations
•Penman E[mm/d] = 0.35 1 + 0.24𝑢 𝑒𝑠 − 𝑒𝑎
•Thornwaite E[cm/mo] = 1.610𝑇
𝐼𝑎
•Romaneko E[mm/mo] = 0.0018 25 + 𝑇 2 10 − ℎ𝑛
•Turc E[mm/d] = 0.013 T/ 15 + 𝑇 𝑅 + 50
•Others
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COMSOL Multiphysics Approach
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Parameters and Variables•Air Temperature
•Diffusion Coefficient – Water Vapor in Air
•Saturated Air (moles/m^3)
•Absolute Humidity (moles/m^3)
•Wind Speed
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Ambient Air Temperature and Absolute Humidity Variations
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Saturated Air Absolute Humidity and Diffusion Coefficient
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Model Geometry
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Simulation Results
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Validation Results
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Summary
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References
Montgomery, R. B. Viscosity and Thermal Conductivity of Air and Diffusivity of Water Vapor in Air. Journal of Meteorology, Pages 193-196, December 1947.
Winter, T.C. and Rosenberry, D.O. Evaluation of 11 Equations for Determining Evaporation for a Small Lake in the North Central United. States. Water Resources Research, Vol. 31 No.4, Pages 983-993, April 1995.
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ReferencesWestern Regional Climate Center, http://www.wrcc.dri.edu/climatedate/tables/
Xu, C.Y. and Singh, V.P. Dependence of Evaporation on Meteorological Variables at Different Time-Scales and Intercomparison of Estimation Methods. Hydrological Processes, 12, Pages 429-442, 1998.
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Acknowledgements
•COMSOL Inc.