Estimativa e análise do volume hídrico do açude público de Sumé-PB por meio de imagem de satélite.

Abstract

The present work emphasizes the importance of water, an essential element to life, a finite resource, scarce and essential for life, emphasizing the knowledge of the bulk of surface storage, using remote sensing tools and geotechnologies, in which, through images and computer programs, it is possible to assist in planning and ensure decision making in the management of natural resources. The present research promoted the estimation and analysis of the stored water bulk of the public reservoir of Sumé-PB, by means of satellite images, with a view to assist in the management water resources. The Sumé dam is located in the Paraíba River basin, in the Cariri Paraibano region, with a maximum storage capacity of 44.8 million m3 with a water area of 8.5 million m2. Orbital images of the LANDSAT 8 / OLI, LANDSAT 5 / TM and ETM and LANDSAT 7 / TM and ETM + satellites were used to perform this work. The system used for digital processing was SPRING 5.4.3. through the stages of Contrast; Main Components (bands 5, 4 and 3 - LANDSAT 5 and 7, and 6, 5 and 4 - LANDSAT 8); IVDN; Highlight by Decorelation; Adjusted Multispectral Composition; and, False color composition (RGB). After the manipulation of the images, the area of the hydraulic basin was cut, by means of vectorization. The statistical analysis was of the inferential type, using spreadsheet MS Excel®, where the analysis and interpretation of the data and percentage tests of the bulks obtained by the Water Volume Analysis method of Molle and Cadier were promoted. A linear regression analysis (R2). and Pearson test, in order to selectionthe best technique to evaluate the water volume of the dams. The methods tested in this study have strong correlation, both between the reference value and between them. All presented a correlation above 0,99, that is, they have correlation level of 99%. The strongest correlation was 0,9988 obtained through RGB_contrast.