Evapotranspiración de la cubierta vegetal mediante la determinación del coeficiente de cultivo por teledetección. Extensión a escala regional: Acuífero 08.29 Mancha Oriental.

by González Piqueras, José

ABSTRACT The methodology Kc?ETo (known as two steps) is commonly used to estimate the water requirements of cover, where Kc is the crop coefficient and ETo is the reference evapotranspiration. From an operational point of view, the estimation of the crop coefficient Kc from satellite can be used to monitor crop evapotranspiration and thus to estimate the crop water requirements. The remote sensing data allow the estimation of crop water requirements over large areas. Within this framework, the thesis continues the previous published works that estimates the crop transpiration from the vegetation indices. The crop evapotranspiration (evaporation from soil and transpiration from vegetation), is estimated by using the relationship between the spectral vegetation indices and the crop coefficient. This emphasis is derived from and confirmed by the requirements of the users (irrigation advisory services, water managers, hydrological models, environmental managers,...) who need tools for operational real-time monitoring evapotranspiration like proposed in this work. The general objective of the work is to analyze and improve the methodology to derive the crop coefficient from the canopy spectral response using the vegetation index (VI) to estimate the crop evapotranspiration. To achieve this objective, several field experiments using the most representative crops in the area (corn and wheat) were carried out using a plot in the area of the 08.29 aquifer (Mancha Oriental). The experiments provide the relationship between the crop coefficient and the vegetation indices. This relationship was extended to the extent of the aquifer during the year 2003 to estimate the average crop coefficient curve and the cover evapotranspiration at different time scales.