The radiation balance in Jacaré River Basin – By Orbital
Keywords:
Energy balance, Hydrological basin, SEBALAbstract
Remote sensing has been proven effective in the evaluation of energy flows and biophysical properties of vegetated surfaces on a regional scale.This paper aimed to determine the radiation balance of the Jacaré river basin, State of Sergipe, Brazil, by using part of SEBAL algorithm - Surface Energy Balance Algorithm for Land - and satellite images of Landsat-5 TM, of 17/10/1999 and 07/12/2006. The following jobs were developed: radiometric calibration, reflectance, planetary and surface albedo, atmospheric transmissivity, normalized difference vegetation index (NDVI), soil-adjusted vegetation index (SAVI), leaf area index (LAI), emissivities, surface temperature, long-wave and short-wave radiations, balance of radiation and flow of heat in the ground. Results showed very slight changes between the targets investigated - caatinga, irrigated cultivation and Atlantic Forest, however, in the general analysis of orbital scenes, substantial differences in albedo were identified. It is worth highlight that the Normalized Difference Vegetation Index (NDVI) showed intense variations between both periods. The average surface radiation (Rn) was 585.1 W/m2 for 1999 and 578.7 W/m2 for 2006, so a little higher for the year of 1999. The methodology used to determine the radiation balance in the Jacaré river basin proved to be consistent, since the results obtained were compatible with data from specific literature for places like the study area.Downloads
Published
2013-06-10
How to Cite
Vasco, A. N., Aguiar Netto, A. de O., & Sousa, I. F. de. (2013). The radiation balance in Jacaré River Basin – By Orbital. Scientia Plena, 9(4). Retrieved from https://scientiaplena.org.br/sp/article/view/1102
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