Análise da disponibilidade hídrica em reservatórios artificiais com sensoriamento remoto na região hidrográfica dos Sertões de Crateús

Abstract

The access to information on reservoir volumes is widely important for effective water resources planning. Only the larger reservoirs may no longer be capable of meeting the needs of the community in drought periods. The Região Hidrográfica dos Sertões de Crateús have the need to better know the volumes and location of unmonitored reservoirs to guarantee water security in the region. The use of indirect methods of volume measurement along the use of remote sensing as a data source can supply the absence of such information. Simplified and modified methods of volume mensuration from the characteristics of water surface geometry already shows a larger accuracy margin, bringing more reliability to the obtained values, as is the method proposed by Pereira et al (2019), using the data periodically provided by FUNCEME, we can show the hydric situation in a given singular space time, demonstrating the reality of such unmonitored reservoirs to the hydric resources planning of the region. According to the FUNCEME data to the year of 2008, there was 363 reservoirs with areas larger than 5 hectare, of which 90 was selected to accumulated volume calculations, for them being of social interest, being the construction of some of them subsidized by the DNOCS as a part of the promotion to the dam construction in the Brazilian Northeast semi-arid. This given work demonstrated the accuracy of the Molle modified equation by Pereira et al (2019) to the characteristic reservoir of the RHSC, the usability of the FUNCEME (2008) data, the unmonitored accumulated volumes in stock, the spatial localization of the given volumes and the proportion to the populations of the cities inserted in the study. It was also shown the classification of the region reservoirs and the General Index of the Dam Saturation for the subbasins of the RHSC, demonstrating which areas have a larger hydric fragility within the process. We can verify that the region has unmonitored reservoirs that can help supply the need of the society, besides assisting with the hydric safety and water democratization.