Investigação e modelamento do fluxo subterrâneo em aquífero aluvial no semiárido da Paraíba.

Abstract

In order to observe the variations of the water tables during the research years, 8 (eight) soundings in the study area were carried out in the period from 05-08-1996 to 13-08-96. besides the "aproveitamento" of 4 existent amazonas wells. A complete topographical survey of the selected area was done, where an automatic pluviometer was installed to avaliate the pluviornetric rate, and volumetric rate measurements were done during the low water months downstream "alluvials dam B i , that exists in the outflow of the pilote aquifer. Along the study area in a 5 km space, three submersed dams exist, where wells were installed : estrategic upstream and downstream each dam. All these field data were used as input data for a numerical simulation model of the spatial and temporal hydrological behaviour, considering non-steady state bidimensional flow anisotropic and heterogeneous. The results obtained with that model satisfectoralry reproduced the field data observed, and were used to estimate the principal hydrological parameters, as well as the amount of available water in the selected space. The methodology applied will allow future hydrological investigations to be done at very low cost and a little period for the other shallow aquifers, typical of the Northeast, as will also be used as a model of the behaviour of the underground water flows in the shallow alluvial aquifers .