Avaliação do tempo de resposta a um aporte pluviométrico na varição do nível de água em um poço tubular localizado em um sistema aquífero cárstico

Abstract

: The increase in demand for groundwater resources in recent years in the Lagoa Santa Karst Environmental Protection Area (APA) located in the state of Minas Gerais has been notable. This protected area encompasses several cities located in the Belo Horizonte metropolitan region, north of the capital of Minas Gerais. A hydrogeological monitoring network was implemented in this APA with the aim of assisting in the understanding of local aquifer systems, as well as in the management of groundwater. Thus, this study used level monitoring data measured over three hydrological years in a well installed in the karst aquifer system in the environmental protection area. Based on the historical series of potentiometric variation observed in well N10, the response time to a rainfall event in the variation of the NA level of this well was calculated using two different methods. A static method was used, guided by the use of cross-correlations and direct observations of the daily oscillation of the water table of the monitoring instrument. For both methods, the response time for recharge was similar, which demonstrates that the methodologies can be used for this type of analysis in aquifers with well-developed karstification.