Modelos geo-elétricos dos aqûíferos de Chame - Bejuco, República de Panamá
2005
Carrasquillla, Abel
Chame - Bejuco region is located 60 km SW of Panama City and has approximately 10 km2. The geology of this area presents layers of sand, alluvium, ashes and volcano rocks. This volcano material presents little fractures and cracks, thus, the principal aquifers are constituted by conglomerate and sands. The Groundwater Department of the Natinal Institute of Aqueducts and Sewerages of the Republic of Pariama (DFSIIDAAN) drilled 17 wells in this area and peifonned 59 vertical electrical soundings (VES) in 1986, both with hydrogeological purposes. These data were interpreted using one, bi and three-dimensional modeis. The used algorithms were 1D forward and inverse with ridge regression approaches; 2D inverse schcmc known as smoothncss-constrained least-squares with the forward problem using numerical techniques as finite diferences and finite elements; and, 31) forward problem with otimized finite diferences. Based on theses interpretations, the VES were classified in four types of curves, which reveal that the first and third family of curves present highly resistive layers that correspond to conglomerate and sand horizons, respectively. Also, resistivity profiles and contour maps reveal an average thickness of 80 m for the main sand aquifer, located in the depression where the resistive basement form in the N part of the area, and, 150 m for conglonierate aquifer in the W sector. The geoelecirical sections, the numerical modelling and the pumping well tests of the boreholes show us that the N sector is the best to drifi boreholes, with the W sector in the second place. For this reason, in this work we chose the N sector to drili more wells, where the well No. 18 was drilled and became the best of the area with 150 gpm.
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