Evapotranspiration (ET) is a crucial part of hydrological cycling, and its (ET) partitioning allows separate assessment of soil and plant water, energy, and carbon fluxes. ET partitioning plays an important role in agriculture since it is related to yield quality, irrigation efficiency, and plant growth. Satellite remote-sense-based methods provide an opportunity for ET partitioning at a subfield scale. However, one challenge is the resolution of the remote sensing data and relating these results to vine plants and irrigation subfield sections (valve units). With the small unmanned aerial system - sUAS such as AggieAir from Utah State University, ET and ET partition estimation via the two-source energy balance (TSEB) model at vineyards can be achieved. In this study, assessment of ET and ET partitioning, soil water evaporation and plant transpiration, using the Grape Remote sensing Atmospheric Profile and Evapotranspiration eXperiment (GRAPEX) information and aerial high-resolution imagery from AggieAir team will be performed. In specific, the performance of two implementations of the TSEB model: TSEB-PT (Priestley-Taylor approach) and TSEB-2T (dual temperature approach) on ET partitioning at a subfield scale will be evaluated, using ground and recently developed machine-learning-based Grapevine LAI imagery. The performance of the TSEB implementations will be documented for three major areas in California called Barelli, Sierra Loma, and Ripperdan, which encompasses major climatological regions in the state.
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