Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Pays Bas → 2019 → Critical comparison of actual evapotranspiration estimates using ground based, remotely sensed and simulated data in the USA : Three measurement sites : Nebraska, Oklahoma, California

UNESCO-IHE Institute for Water Education, Delft (2019)

Critical comparison of actual evapotranspiration estimates using ground based, remotely sensed and simulated data in the USA : Three measurement sites : Nebraska, Oklahoma, California

Kibria, Saad

Titre : Critical comparison of actual evapotranspiration estimates using ground based, remotely sensed and simulated data in the USA : Three measurement sites : Nebraska, Oklahoma, California

Auteur : Kibria, Saad

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2019

Résumé
Quantification of actual evapotranspiration is of immense interest to the present-day irrigation managers and agriculturalists, because it helps in making water management and allocation decisions, and also estimating water demand and irrigation requirements. Irrigated agriculture takes a large chunk of the consumptive use of water, through evapotranspiration. Many techniques to estimate evapotranspiration are available today, including direct and indirect ones. However, due to a lack of validation of estimates of evapotranspiration from various techniques, there arises the need of a critical comparison of actual evapotranspiration estimated from a combination of few methods. This work shows a critical comparison of actual evapotranspiration obtained using ground based, remotely sensed, and simulated data. The three methods used in this research are : (1) Eddy Covariance ; (2) Remote Sensing ; (3) a crop-soilwater balance model SIMETAW# (Simulation of Evapotranspiration of Applied Water). The combination of these three methods and the comparison of their results is a very unique research, as it involves observed (in-situ) data, remotely sensed satellite data and simulated/modelled data. This yields a nice combination of results from entirely different kind of sources. The study focusses on three sites which are based in Nebraska, Oklahoma and California, in the United States of America. These sites are chosen based on the availability of crop data at eddy covariance stations, since the SIMETAW# model used in this research requires crop data, so those eddy covariance stations are chosen which are installed in crop fields, and not plain grass. For carrying out the analysis, climate and flux data are observed from Eddy Covariance towers, climate data are obtained from NLDAS, and remotely sensed data from ET ensemble. Also, there is soil and crop data of the sites where the stations are installed.

Sujets  : evapotranspiration agriculture data collection remote sensing United States of America

Présentation

Page publiée le 6 avril 2021