Proposta de modelos hidrogeológicos conceituais aplicados aos aqüíferos da região do Distrito Federal

Abstract

This paper presents the conceptual aquifers models applied to the Distrito Federal region emphasizing the hydrogeologic information that control the groundwater flow conditions. Generally, the mathematical models are based on conceptual models, which are based on local observations. The proposed models have been formulated from a data base collected in several places of the Distrito Federal, mainly during deep wells construction which are important information source about geology and hydrogeology. The groundwater occurrence conditions are different, considering characteristics of the aquifer, climate, soils type and structural conditions. It is difficult to explain mathematically all parameters, however the conceptual models can be a representation of the natural hydrogeologic conditions and can be proved by applying scientific studies. The main objective of mathematical or conceptual modeling is to represent the real conditions of occurrence and groundwater movement. The main goal of this paper is to show the conceptual hydrogeological models proposed in the Distrito Federal region, considering the physical and hydraulic characteristics and the area where they can be applied. The groundwater occurrence conditions and movement knowledge can help in the management of groundwater resources, groundwater supply and protection of recharge areas. Based on hydrodynamic data acquired from deep wells and physical/structural characteristics of the rocks associated to the different fractured aquifers overlain by soil coverage, four hydrogeological flow models were described: (1) the two potenciometric surfaces model, (2) the fractured-carstic model (3) the unique confined potenciometric surface model, (4) the unique non confined potenciometric surface model.