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Hydrologylec14_evap_meas - Evapotranspira on...

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3/1/12 1 Evapotranspira+on Measurement and Es+ma+on Mass Balance Approachs Evapora+on Pans In Canada, 1.2 m in diameter 25 cm deep used at hundreds of climate sta+ons during the frost free season evapora+on = change in water level (or amount of water added to keep level constant) – precipita+on typically overes+mate evapora+on placement very important ET o = K p E pan Where: K p is the pan coefficient values of K p can range between 0.4 to 0.85 and are dependant on pan si+ng and wind speed
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3/1/12 2 Lysimeters Energy Balance Approaches Bowen Ra+o ra+o of sensible heat to latent heat flux B= SH/ LE possible by measuring the difference between temperature and vapour pressure at two levels
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3/1/12 3 Bowen Ra+o Evapotranspira+on can be solved as: Where: the psychrometric constant (0.066 kPa K ‐1 ) varies with pressure, and the latent heat of vaporiza+on γ Where: C a – heat capacity of air MJ kg -1 K -1 P - pressure kPa v – latent heat of vaporization MJ kg -1 λ Bowen Ra+o
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