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start:hype_model_description:processes_above_ground [2019/08/27 15:34]
cpers [Alternative potential evaporation models]
start:hype_model_description:processes_above_ground [2019/09/20 12:50] (current)
cpers [Alternative potential evaporation models]
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 === Model 5 - FAO Penman-Monteith === === Model 5 - FAO Penman-Monteith ===
-The FOA Penman-Monteith potential evaporation depends on net downward radiation (//​netrad//​),​ slope of saturated vapour pressure curve (//​dsatvap//​),​ saturated and actual vapour pressure (//satvap// and //​actvap//​),​ temperature (//T//), wind speed (//wind//) and a psychrometric constant (<​m>​gamma</​m>​). One land use dependent parameter (crop coefficient //kc5// or //kc//) is used.+The FAO Penman-Monteith potential evaporation depends on net downward radiation (//​netrad//​),​ slope of saturated vapour pressure curve (//​dsatvap//​),​ saturated and actual vapour pressure (//satvap// and //​actvap//​),​ temperature (//T//), wind speed (//wind//) and a psychrometric constant (<​m>​gamma</​m>​). One land use dependent parameter (crop coefficient //kc5// or //kc//) is used.
  
 <m> epot_{base} = MAX(0,​kc*{0.408 * dsatvap*netrad + gamma*{{900}/​{T+273}}*wind*(satvap-actvap)}/​{dsatvap+gamma*(1+0.34*wind)}) </m> <m> epot_{base} = MAX(0,​kc*{0.408 * dsatvap*netrad + gamma*{{900}/​{T+273}}*wind*(satvap-actvap)}/​{dsatvap+gamma*(1+0.34*wind)}) </m>
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