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Tracking Evaporative Loss From Standing Water. Liz Mitnick Fall 2013. Modeling Evaporation: Relating Evaporation Rate to Change in Volume. m ethod: ordinary differential equation discretization - dV / dt = surface area*k k includes: n et radiation change in energy storage of water
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Tracking Evaporative Loss From Standing Water Liz Mitnick Fall 2013
Modeling Evaporation: Relating Evaporation Rate to Change in Volume • method: ordinary differential equation discretization • -dV/dt= surface area*k • k includes: • net radiation • change in energy storage of water • latent heat of vaporization • specific heat of air and water • atmospheric pressure • temperature at water surface: changes with time of day (sine function– exaggerated amplitude to see “leveling off” of volume during cold temperatures) • temperature of air: changes with time of day • molecular weight ratio of water to dry air • saturation vapor pressure of air*