The assessment of the water needs for a specific crop has a fundamental importance in the management of water resources. The application of empirical models able to retrieve estimates of the actual evapotranspiration (ETa) to assess the need for water could give a valid tool for the planning of water supply, avoiding unnecessary water losses. In this context, two independent models for estimating actual evapotranspiration were compared. The first model is based on an energy balance and uses remotely sensed data and ancillary data from weather stations to assess the ETa. The second model also uses remotely sensed data and climatic data on a daily basis from a weather network. Field measurements are needed to calibrate both models. The study was conducted in a commercial vineyard located in Napa Valley (California). The observed range of ETdaily is included within the values measured by other authors. The results retrieved from both models show actual ETdaily values with a different trend over time; after mid-summer (early July) VSIM estimates of ETdaily trend downwards, while SEBAL estimates remain fairly constant. This disagreement illustrate the difficulty in estimating the actual evapotranspiration at the end of season, when soil moisture gets low and vine water stress increases due to reducing stomatal conductance.

Gentile, A., Pierce, L., Ciraolo, G., Zhang, G., La Loggia, G., Nemani, R. (2009). Comparison between energy balance and mass balance models for actual evapotranspiration assessment. In Proc. SPIE 7472, Remote Sensing for Agriculture, Ecosystems, and Hydrology XI, 747212 (September 18, 2009) (pp.747201-747212). SPIE [http://dx.doi.org/10.1117/12.830229].

Comparison between energy balance and mass balance models for actual evapotranspiration assessment

CIRAOLO, Giuseppe;LA LOGGIA, Goffredo;
2009-01-01

Abstract

The assessment of the water needs for a specific crop has a fundamental importance in the management of water resources. The application of empirical models able to retrieve estimates of the actual evapotranspiration (ETa) to assess the need for water could give a valid tool for the planning of water supply, avoiding unnecessary water losses. In this context, two independent models for estimating actual evapotranspiration were compared. The first model is based on an energy balance and uses remotely sensed data and ancillary data from weather stations to assess the ETa. The second model also uses remotely sensed data and climatic data on a daily basis from a weather network. Field measurements are needed to calibrate both models. The study was conducted in a commercial vineyard located in Napa Valley (California). The observed range of ETdaily is included within the values measured by other authors. The results retrieved from both models show actual ETdaily values with a different trend over time; after mid-summer (early July) VSIM estimates of ETdaily trend downwards, while SEBAL estimates remain fairly constant. This disagreement illustrate the difficulty in estimating the actual evapotranspiration at the end of season, when soil moisture gets low and vine water stress increases due to reducing stomatal conductance.
1-set-2009
Proceedings of SPIE - The International Society for Optical Engineering - Remote Sensing for Agriculture, Ecosystems, and Hydrology XI; Berlin; Germany
Berlino (Germania)
1 Settembre 2009
7472
20-ago-2009
2009
12
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1341592
Gentile, A., Pierce, L., Ciraolo, G., Zhang, G., La Loggia, G., Nemani, R. (2009). Comparison between energy balance and mass balance models for actual evapotranspiration assessment. In Proc. SPIE 7472, Remote Sensing for Agriculture, Ecosystems, and Hydrology XI, 747212 (September 18, 2009) (pp.747201-747212). SPIE [http://dx.doi.org/10.1117/12.830229].
Proceedings (atti dei congressi)
Gentile,A; Pierce, L; Ciraolo, G; Zhang, G; La Loggia, G; Nemani,R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/74464
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