Aplicação do algoritmo SAFER na obtenção da evapotranspiração atual das culturas em condições de cerrado
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2016-03-03
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Universidade Federal de Goiás
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To realize an efficient management of water use in irrigated agriculture is important to obtain meteorological information to assist in the management of water resources. Since the data of evapotranspiration (ET) they are often used as a fundamental criterion in irrigation operations in the calculation of water balance and agroclimatic zoning. Therefore, the estimated evapotranspiration of culture on a regional scale, based on satellite images represent a great contribution to the studies on the management of water resources, being able to provide their estimate in areas with high heterogeneity and size, to Unlike micrometeorological methods and even of direct measures such as lysimeter. Compared to other models that use the energy balance, the SAFER (Simple Algorithm for Retrieving Evapotranspiration) has a simpler parameter, requiring only the remote data of the albedo, NDVI and temperature. The SAFER still has the additional advantage of using data from both types of stations meteorological conventional and automatic. This feature is important because it allows the assessment of historical trends of energy balance components on a large scale over the years,given that automatic sensors are relatively recent developments in instrumental technology. Considering the recent development of SAFER, there are not many studies to assess its performance. The aim of this study was estimate the culture evapotranspiration and their respective Kc's in its different phenological phases without water restriction, in areas in Goias Cerrado region, using remote sensing techniques for validation of the agro-meteorological model SAFER (Simple Algorithm for Evapotranspiration Retrieving) in compared to the method standard FAO 56. , using agrometeorological monitoring and after evaluation of the model's reliability, make a comparison between the ETr estimation method obtained by SAFER,with the climatological hidric balance and the soil water balance in order to validate the proposed methodology as an alternative to methods traditional. The structure of this study is as follows: after the introduction and literature review on the topic, the first chapter presents the SAFER calibration data and its application in bean crop, tomato, sugarcane and wheat in Goias Cerrado, taking as reference the water requirement estimates using the FAO methodology; and then, after proof of efficiency, in the second chapter presents the SAFER application results in a dry area cultivated with sugarcane in order to present it as an alternative to traditional methods
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SOUZA, J. M. F.. Aplicação do algoritmo SAFER na obtenção da evapotranspiração atual das culturas em condições de cerrado. 2016. 92 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2016.