Estimativas de evapotranspiração através de sensoriamento remoto e métodos empíricos para o estado do Rio de Janeiro e Parque Nacional do Itatiaia

Abstract

Evapotranspiration is a fundamental step in maintaining the water cycle. Consequently, its occurrence has an impact on the availability of water in natural and man-made environments and on agricultural productivity. In order to understand the hydrological cycle in areas with different levels of impact, it is important that evapotranspiration studies are carried out both in natural and anthropogenic environments. In Conservation Units, such studies can contribute to the development of more effective management plans. Therefore, studies involving the application of evapotranspiration estimation techniques are essential for this parameter to be more widely used. In order to understand the dynamics of evapotranspiration in the Itatiaia National Park and in the State of Rio de Janeiro, this study used remote sensing techniques and empirical equations. For the Itatiaia National Park, micrometeorological sensors installed in a tower in the Park were used and images from orbital remote sensing were used, all estimates were compared with the FAO-56 reference method, from December 2017 to November 2018. For the rest of the state, evapotranspiration estimates were obtained using the product MOD16A2 and seven empirical equations, using the FAO-56 reference method, with data obtained from six meteorological stations in the state of Rio de Janeiro, in the period from 2007 to 2013, including La Niña, El Niño and Neutrality phases.