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Combination Method (Penman)<br />
• Evaporation can be estimated by aerodynamic method (E a ) when energy<br />
supply not limiting and energy method (E r ) when vapor transport not<br />
limiting<br />
• Typically both factors limiting so use combination of above methods<br />
E<br />
<br />
g<br />
E r E a<br />
g<br />
g<br />
• Weighting factors sum to 1.<br />
= vapor pressure deficit<br />
g = psychrometric constant<br />
<br />
4098<br />
e s<br />
2<br />
237.3 T<br />
g 66.8Pa /<br />
0 C
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