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- Title
Water stress coefficient determined by orbital remote sensing techniques.
- Authors
Alves, Élvis da S.; Filgueiras, Roberto; Rodrigues, Lineu N.; Cunha, Fernando F. da; Aleman, Catariny C.
- Abstract
In regions where the irrigated area is increasing and water availability is reduced, such as the West of the Bahia state, Brazil, the use of techniques that contribute to improving water use efficiency is paramount. One of the ways to improve irrigation is by improving the calculation of actual evapotranspiration (ETa), which among other factors is influenced by soil drying, so it is important to understand this relationship, which is usually accounted for in irrigation management models through the water stress coefficient (Ks). This study aimed to estimate the water stress coefficient (Ks) through information obtained via remote sensing, combined with field data. For this, a study was carried out in the municipality of São Desidério, an area located in western Bahia, using images of the Landsat-8 satellite. Ks was calculated by the relationship between crop evapotranspiration and ETa, calculated by the Simple Algorithm for Evapotranspiration Retrieving (SAFER). The Ks estimated by remote sensing showed, for the development and medium stages, average errors on the order of 5.50%. In the final stage of maize development, the errors obtained were of 23.2%.
- Subjects
BAHIA (Brazil : State); BRAZIL; REMOTE sensing; EVAPOTRANSPIRATION; IRRIGATION management; WATER supply; WATER efficiency; WATER; REMOTE-sensing images
- Publication
Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi, 2020, Vol 24, Issue 12, p847
- ISSN
1807-1929
- Publication type
Article
- DOI
10.1590/1807-1929/agriambi.v24n12p847-853