ISHS Acta Horticulturae 537: III International Symposium on Irrigation of Horticultural Crops
CALIBRATION OF THE PENMAN-MONTEITH METHOD TO ESTIMATE LATENT HEAT FLUX OVER A GRASS CANOPY |
| Authors: | S.O. Ortega-Farías, C. Avevedo, S. Fuentes |
| Keywords: | Penman-Monteith, canopy resistance, latent heat flux, grass. |
| Abstract:
A study was performed at the Panguilemo Evapotranspiration Investigation Plot (ETIP) located 11 km north of Talca, Chile (35º23´ South and 71º West; 110 m above the sea level) to evaluate latent heat flux by using the Penman-Monteith method. Data collected on a 20 minute time intervals included latent heat flux (LE), net radiation (Rn), soil heat flux (G), air temperature (Ta), relative humidity (RH), and wind speed (V). The performance of the Penman-Monteith equation (LEPM) was tested with latent heat flux measurements from the eddy correlation system (LEED) over a grass canopy under different soil moisture conditions. Results indicate that there was a good agreement between LEPM and LEED with an overall standard error of estimate (SEE) of 45 W.m-2 and an absolute relative error of 6.2 %. | |
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