Estimativa de Balanço Hídrico por meio de dados multi-sensores

This study aimed to use remote sensing data of different missions, to estimate the water balance in four drainage areas, delimitated from flow measuring stations, in different basins in Brazil. Through the results it was possible to verify that three out of the four areas; in the Amazonas, Tocantins and São Francisco basins; significant results were verified between the terms of the water balance dS/dT and (P-ET-Q). In these areas, correlation coefficients (r) ranged, from 0.77 to 0.90; and determination (R2), from 0.60 to 0.83. In Tocantins basin, the flow measuring station Iraí, which has the smallest area, was where they obtained the worst estimates. The evapotranspiration, for all drainage areas, was the component that presented the worst estimates, primarily to the areas of the Amazonas and Uruguai basins. In Tocantins and São Francisco basins’ areas, it was observed a highly seasonal behavior of all variables for both areas. In addition, it was noted a relation between the precipitation and evapotranspiration dynamics with the water storage. Finally, despite the differences; of missions, spatial and temporal resolutions; the remote sensing data, applied to the water balance estimates, has shown satisfactory results especially for large areas, presenting itself as a promising alternative about hydrological studies.