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Parameterization of a Clumped Model to Directly Simulate Actual Evapotranspiration over a Superintensive Drip-Irrigated Olive Orchard.
- Source :
- Journal of Hydrometeorology; May2019, Vol. 20 Issue 5, p935-946, 12p
- Publication Year :
- 2019
-
Abstract
- The aim of this research was to evaluate the clumped model for estimating latent heat flux (LE) and actual evapotranspiration (ETa) over a non-water-stressed olive orchard. Additionally, submodels to compute the net radiation Rn, soil heat flux G, and canopy resistance were also included. For this objective, a database was used from an experimental unit inside a commercial superintensive drip-irrigated olive orchard located in the Pencahue Valley, Maule Region, Chile (35°23′S, 71°44′W; 96 m above sea level) during the 2009/10 and 2010/11 growing seasons. The evaluation was carried out using measurements of LE obtained from an eddy covariance (EC) system. In addition, estimated values of Rn, G, and were compared with ground-truth measurements from a four-way net radiometer, soil heat flux plates with soil thermocouples, and a portable porometer, respectively. Results indicated that the clumped model underestimated LE and ETa with errors of 11.0% and 3.0%, respectively. Values of the root-mean-square error (RMSE), mean bias error (MBE), and index of agreement dr for LE were 35 W m−2, −1.0 W m−2, and 0.96, while those for ETa were 0.48 mm day−1, 0.04 mm day−1, and 0.64, respectively. The submodels computed Rn and G with errors less than 6% and RMSE values less than 65 W m−2, while the Jarvis-type model predicted with RMSE = 41 s m−1 and MBE = 7.0 s m−1. Finally, a sensitivity analysis indicated that the ETa estimated by the clumped model was significantly affected by variations of ±30% in the values of the LAI and the minimum stomatal resistance rstmin. [ABSTRACT FROM AUTHOR]
- Subjects :
- LATENT heat
EVAPOTRANSPIRATION
PARAMETERIZATION
HEAT flux
ORCHARDS
OLIVE
SOIL air
Subjects
Details
- Language :
- English
- ISSN :
- 1525755X
- Volume :
- 20
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Journal of Hydrometeorology
- Publication Type :
- Academic Journal
- Accession number :
- 136649865
- Full Text :
- https://doi.org/10.1175/JHM-D-18-0135.1