Utility of Thermal-Based Two-Source Model for Routine Evapotranspiration Estimation of Vineyards
Hydrology and Remote Sensing Laboratory
2013 Annual Report
1a.Objectives (from AD-416):
Evaluate and refine thermal-based remote sensing models and develop operational tools for quantifying water use (evapotranspiration) and root zone water availability and stress of vineyards for improved water management while maintaining grape productivity and quality.
1b.Approach (from AD-416):
Conduct intensive field experiments collecting evapotranspiration (ET), root zone soil moisture and biophysical data in concert with high resolution aircraft remote sensing imagery provided by Utah State University (Collaborator). The remote sensing imagery from aircraft and satellite sensors will be used to evaluate and refine remote sensing-based ET models for quantifying vineyard water use and vine stress/condition at different vine phenological stages. The high resolution aircraft imagery will be used to distinguish vine and cover crop contributions to total water use and root zone water availability as well as the capability of using coarser resolution satellite data with thermal sharpening techniques to provide separate vine and cover crop contributions to total ET.
The E&J GALLO WINERY cooperators have secured two vineyards, a mature and young Pinot Noir field site, for collecting tower-based eddy covariance measurements of evapotranspiration (ET) and surface energy balance this growing season. Additionally, E&J GALLO cooperators are collecting biophysical data , vine transpiration data and profile soil moisture from a network of sensors within the upwind source-area of the eddy covariance towers. All field sensors have been operating since April, 2013. A first Intensive Observation Period (IOP) involving the collection of high resolution airborne imagery was successfully conducted April 10-12, 2013.