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Groundwater is considered a safe, well protected source of water supply, and in some places it should be used as a strategic reserve. However, lack of adequate management in a coastal aquifer has led to several problems, including seawater intrusion. The Recife metropolitan region encompasses 14 towns and has 14 m3/s of water supply demand, and is facing deficit problems. A drought during 1998 and 1999, caused by low precipitation rates, led to a severe crisis, with the surface water reservoirs reaching very low storage levels. Consequently, the number of operating wells increased. This work aims at analyzing the possibility of seawater intrusion and the effect of measures to control this process in Boa Viagem and Cabo aquifer, considering the scenario of over-exploitation and injection wells. The neighborhoods of Boa Viagem and Pina in Recife, and Piedade in Jaboatão dos Guararapes, were been chosen for the high number of operating wells and existing data on groundwater salinity. A conceptual model was been defined for the mathematical modeling. A 15-km long cross-section (10 Km on the continent and 5 Km in the sea) was considered. The SHARP model (USGS) was used. Data from previous field investigations and studies were used and different scenarios were simulated considering pumping, natural and artificial recharge. Key-words: Marine intrusion, coastal aquifer, mathemati-

Modelagem Numérica Aplicada à Análise de Medidas de Controle da Intrusão Marinha na Região Sul da Planície do Recife (PE