Alterações nos Gradientes de Temperatura Provocadas por circulação de Água no Solo

Abstract

The heat flow density data published in the geothermal Atlas of Europe(1992) show relatively high values for temperature gradients and for thermal conductivity obtained in the SW area of the Iberian Peninsula . In the first part of this study we explain how an anomalous value of thermal conductivity or heat production value can influence heat flow density values. In the second part we try to explain the anomalous values based in the presence of water at relatively high temperatures outside the holes where the measurements were made, and the inclination of strata, derived from samples taken from the boreholes. We used a two-dimensional numerical model based on the finite volume method. Equations governing the transfer of energy by conduction, advection and fluid flow, were solved. The heat flow density value considered for the region is 60 mw m-2. The results obtained are compared with those published.