Aplicação de geotecnologias para a determinação de parâmetros morfométricos e fisiográficos de uma sub-bacia hidrográfica

Abstract

The Remotely Piloted Aircraft System (RPAS) combined with Geographic Information Systems (GIS) has been growing as a source of obtaining, processing and analyzing data for studies of the hydrological behavior of watersheds. The research in question aimed to analyze the applicability of the use of RPAS and GIS geotechnologies as a subsidy for the mapping, determination and dimensioning of morphometric and physiographic parameters of the Córrego dos Chaves sub-basin, located in the municipality of Morrinhos - GO. The methodology of this work was based on the realization of 10 flights using the eBee Plus RTK aircraft that has on board the Sensor Optimised for Drone Applications (S.O.D.A.) camera, both manufactured by senseFly. To obtain the orthomosaic, the Digital Terrain Model (MDT) and the contour lines, the flights were processed in the Agisoft Metashape Professional program. From the products obtained in the processing of the aerophotogrammetric flight, the automatic extraction of the sub-basin and drainage network in a SIG environment was performed, which served as a basis for determining the parameters proposed in this research. Some of the results determined for the sub-basin under study were: area of 12.60 km2, perimeter of 20.10 km, ordering of grade 3 channels, length of the main watercourse of 5.12 km and total length of watercourses of 14.82 km. From the slope, it was found that the predominant type of relief in the sub-basin area is the smooth wavy in which it occupies 7.37 km2, which corresponds to 58.52% of the total area. The data generated at the end of this analysis can serve as support for future hydrological studies involving the planning of use and management of water resources, as well as the control and environmental monitoring of the sub-basin of the Córrego dos Chaves. It is recommended to continue and deepen the study in question.