Estudo do comportamento bi e tridimensional do fluxo em um aquífero aluvial adjacente ao rio Paraíba na M.R.H. agropastoril do baixo Paraíba.

Abstract

In this dissertation studies were made on the uni, bi and three-dimensional behavior of an alluvial aquifer with an average thickness of 8 cm, adjacent to the Paraíba River, 12 km from Juripiranga city, being in M.R.H. Agro-Pastoral of Baixo Paraíba. An area of ​​about 40,000 m2 was delimited, almost forming a square. CDRM / CAGEPA data were used, such as the drilling lithological profiles and pumping well results obtained at a flow rate of 26.67 m3 / h. In order to calibrate it in a P.C computer, in order to check the veracity of the results, the hydrodynamic parameters were established, thus treating the spatial permeabilities of 21.6m / effective porosity of 0.30. Variations of the unevenness in the impermeable bases of the considered sections, which cause spatial velocity components, were treated. The study area was divided into two main configurations, quadrangles and rectangles, and these areas were further subdivided to know the individual and global effects on flow conditions and velocities. A comparative study was made between the results thus obtained from the two configurations. Necessary conditions have been established for flow in aquifers to become uni, bi and three-dimensional. In a procedure by using the two-dimensional loads of the four corners of the regular / irregular tetrahedra, the Pinder et al (1982) device was adopted in both configurations to determine the velocity components and their resultants, in and with the y - x plane. . The effects of high pumping rates on uni and two-dimensional loads developed in the aquifer were investigated, with different flow rates adopted, at a central point of a reduced 60mx60m network. The results were interpreted under two-way inclined groundwater conditions, which have their applications in public water well decontamination studies. In another attempt, which was made using the slope of the equipotential lines and the spacing between them, the Kashef (1986) trick of three distinct wells was adopted to determine the magnitude and direction of velocity, treating a triangular area. The results of these researches were presented in the form of tables and graphs, in two and three dimensions, the latter being to give a warning the perspective of the phenomena.