Estimativa da vulnerabilidade de aqüíferos utilizando sistemas de informação geográfica e geoestatística-UGRHI-PCJ / Aquifer vulnerabilty assessment using geographic information system and geoestatistics - UGRHI-PCJ

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The natural aquifer vulnerability estimative is one of the primary tasks to be accomplished for a groundwater planning, control and prevention program, that would for example aim a protection perimeter design for human use or environmental protection. In this study the GOD model (G from groundwater confinement; O from overlay strata; D from depth to groundwater) (FOSTER et al. 1998) was applied for the natural groundwater vulnerability estimative of Sao Paulo State Water Resource Management Unit of the Hydraulic Basins of Piracicaba, Capivari and Jundiaí. An intensive bibliographic research related to physiographic and environmental characteristics from the researched area, and hydrogeologic criteria used for aquifer vulnerability estimative were also included. The GOD model uses as parameters the type of groundwater confinement, the vadoze zone representative litology and depth to groundwater in meters. To perform the estimative analysis and map elaboration the Brazilian Geologic Map 1:1.000.000 (CPRM, 2004) and the Sao Paulo State Groundwater Map (DAEE, IG, IPT and CPRM, 2005) were used as input database. In spite of the fact that the GOD model is well known and have been extensively applied both in Brazil and South America, it was suggested in this study the insertion of a pluviometric index as a fourth parameter to be considerate in the GOD model, for a groundwater vulnerability estimative in scales lower than 1:250.000. As an increment for academic research, it was also applied geostatistic methods as residual krigage of five SRTM images, multiple regression analysis of annual mean pluviometric data obtained from DAEEs pluviometric stations and, krigage with external derivation from the multiple regression analysis output data. All maps, figures and GOD model input data were developed, designed and analyzed using specific software for Geographic Information System integration, better known as GIS.

ASSUNTO(S)

vulnerability aquíferos sig gis vulnerabilidade aquifer

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