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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Assessment of groundwater recharge and water fluxes of the Guarani Aquifer System, Brazil

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Author(s):
Rabelo, Jorge Luiz [1] ; Wendland, Edson [2]
Total Authors: 2
Affiliation:
[1] Fed Univ Reconcavo da Bahia, Ctr Exact Sci & Technol, BR-44380000 Cruz Das Almas, BA - Brazil
[2] Univ Sao Paulo, Dept Hydraul & Sanit Engn, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: HYDROGEOLOGY JOURNAL; v. 17, n. 7, p. 1733-1748, NOV 2009.
Web of Science Citations: 28
Abstract

The groundwater recharge and water fluxes of the Guarani Aquifer System in the state of Sao Paulo in Brazil were assessed through a numeric model. The study area (6,748 km(2)) comprises Jacar,-Gua double dagger A(0) and Jacar,-Pepira River watersheds, tributaries of the Tiet River in the central region of the state. GIS based tools were used in the storage, processing and analysis of data. Main hydrologic phenomena were selected, leading to a groundwater conceptual model, taking into account the significant outcrops occurring in the study area. Six recharge zones were related to the geologic formation and structures of the semi-confined and phreatic aquifer. The model was calibrated against the baseflows and static water levels of the wells. The results emphasize the strong interaction of groundwater flows between watersheds and the groundwater inflow into the rivers. It has been concluded that lateral groundwater exchanges between basins, the deep discharges to the regional system, and well exploitation were not significant aquifer outflows when compared to the aquifer recharge. The results have shown that the inflows from the river into the aquifer are significant and have the utmost importance since the aquifer is potentially more vulnerable in these places. (AU)