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ARS Home » Northeast Area » Beltsville, Maryland (BARC) » Beltsville Agricultural Research Center » Hydrology and Remote Sensing Laboratory » Research » Publications at this Location » Publication #363662
Research Project: Integrating Remote Sensing, Measurements and Modeling for Multi-Scale Assessment of Water Availability, Use, and Quality in Agroecosystems

Location: Hydrology and Remote Sensing Laboratory

Title: Forward to the GRAPEX special issue

Author
item Kustas, William - Bill
item AGAM, N. - Ben Gurion University Of Negev
item ORTEGA-FARIAS - University Of Talca

Submitted to: Irrigation Science
Publication Type: Review Article
Publication Acceptance Date: 5/17/2019
Publication Date: 5/25/2019
Citation: Kustas, W.P., Agam, N., Ortega-Farias 2019. Forward to the GRAPEX special issue. Irrigation Science. https://doi.org/10.1007/s00271-019-00633-7.
DOI: https://doi.org/10.1007/s00271-019-00633-7

Interpretive Summary:

Technical Abstract: Initial research results presented in this Special Issue from the GRAPEX project cover a broad range of topics as well as a full range in spatial and temporal scales. It starts with a set of papers dealing, at micrometeorological scales, with analysis of turbulent intermittency above and below the vine/interrow system, surface energy balance (SEB) above and below the vine canopy, evaluation of surface renewal technique for ETa estimation, modeling and measurement of radiation divergence through the vine canopy, the micro-scale distribution of soil heat flux, and investigation of the temporal behavior of canopy/leaf level crop water stress index. A paper on evaluation of several indirect measurement methods of vine leaf area index used in validating remote sensing retrievals is also presented, which is critical for upscaling remotely sensed leaf area beyond the canopy to the field, landscape and regional scale using satellite data. Following these studies are aspects of land surface temperature (LST)-based two-source energy balance (TSEB) model and its utility in ETa partitioning between vine and interrow: validation at the micrometeorological scale; the impact of modifications to TSEB wind extinction algorithms through the vine canopy layer to account for unique vine row and canopy architecture/structure; and sensitivity of TSEB model SEB output to uncertainty in aerodynamic roughness parameters. At the canopy to field scale the utility of very-high-resolution imagery is then examined: use of very high-resolution UAV imagery for mapping vineyard ETa and partitioning of ET between vine and interrow and detection and impact of shadows in UAV imagery on SEB modeling. Finally, validating the satellite-based data fusion ETa modeling system that generates daily 30 m ETa year-round at field to regional scales completes the special issue.