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Assessing the impact of large-scale dewatering on fault-controlled aquifer systems: a case study in the Acque Albule basin (Tivoli, central Italy) |
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| Authors: | Elio Brunetti Jon P Jones Marco Petitta David L Rudolph |
| Institution: | 1. ENVIRON Italy, Via Vincenzo Lancetti 43, 20158, Milan, Italy 2. Department of Earth and Environmental Sciences, University of Waterloo, 200 University Ave. West, Waterloo, N2L 3GI, Ontario, Canada 3. Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, P.le Aldo Moro 5, 00185, Rome, Italy |
| Abstract: | The development of large-scale bedrock quarry operations often requires high-volume and long-term groundwater extraction to maintain a sustainable working environment. These dewatering activities often influence groundwater levels and flow patterns regionally. In the present study, the influence of the dewatering of the travertine quarry operations near the city of Tivoli, Italy, are quantitatively investigated through an integrated analysis of field data and numerical modeling. Lowering of regional groundwater levels in the vicinity of the quarry has led to destructive land subsidence and alterations to the flow system sustaining a hot-spring area. The study employs a finite element numerical model (FEFLOW) to evaluate and quantify the impact of the extensive dewatering on fault-controlled regional groundwater flow in the Acque Albule basin. By incorporating the physical field data and historical hydrologic information, the numerical model was calibrated against three groundwater scenarios, reproducing the effects of different exploitation activities, coupled with natural changes over the course of the quarry operation. The results indicate that groundwater withdrawals by the mining industry and by “Terme di Roma” spa resulted in the cessation of flow from the primary thermal spring and a drop in the phreatic level in the area consequently affected by land subsidence. |
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