Investigação baseada em GIS e Calculadora AHP para identificação de zonas potenciais para águas subterrâneas no Rio Araguari

Abstract

The gradual increase in demand for water resources today is common in industries, agro- industries, and urban water supply. Therefore, the placement of tubular wells meets the existing water needs in urban and rural regions. However, this task is not always easy, especially without knowledge of local geological and hydrogeological conditions. In areas with fractured aquifers, assessing locations with higher occurrences of groundwater can become even more complex. Addressing this issue, this thesis aims to provide a final output: a groundwater favorability map, helping to reduce uncertainties and potentially assisting in future groundwater prospecting efforts for well location, saving time and financial resources. The targeted area covers the lower and middle reaches of the Araguari River in the municipalities of Araguari and Uberlândia, Minas Gerais. This study utilized geographic data, reprocessed within a GIS environment, resulting in four main maps, each essential for identifying groundwater reserves: (1) lithological, (2) structural lineament density (morphostructural, gamma-ray spectrometric, and magnetometric), (3) HAND, and (4) aquifer maps. These were integrated using the Analytic Hierarchy Process (AHP) method, allowing the delineation of areas with higher and lower groundwater potential. The Multi-Criteria Analysis methodology helped determine favorable zones for well drilling, leading to a probabilistic final map of hydrogeological potential. The thematic map of hydrographic potential was validated using existing wells in the area, based on their specific capacity.