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- W2273923027 abstract "For the past thirty-five years, the layered aquifer system of Central Veneto (Italy) has seen an increasing demand of water for domestic and private uses and a significant reduction of groundwater heads. During these years the origin and development of important groundwater pollution phenomena in the relevant aquifers has been revealed by a quality monitoring system. These aquifers are particularly vulnerable because of the presence of industrial activity in areas characterized by high permeability soils highly susceptible to contaminants transport.The presenti thesis deals with mathematical models of the relevant processes (flow and transport), jointly with their field validations.The regional groundwater flux model developed is a large scale scheme originating from detailed studies of the hydrogeological system including: accurate reconstruction of the geological model; hydrogeological characterization; estimates of the groundwater fluxes for mass balance. The three-dimensional flow model allows for the establishment of causal relationships between withdrawal of water (whatever the production layer, and the extracted flow rates) and the fluctuations of piezometric heads anywhere in the system. Its purpose is to provide boundary conditions for the study of flow models and specifically of transport models at smaller scale.The chief aim of this work is to develop a three-dimensional transport model of solutes within the heterogeneous aquifer systems, in order to obtain long-term predictions of pollutant migration into geologic deposits characterized by variable hydraulic properties. The transport model is implemented according to different numerical approaches: first, a finite elements method is adopted, secondly a Lagrangian approach (Particle Tracking) is taken into account and, finally, the advection-dispersion equation in groundwater, used to describe solute transport in porous media, is solved by a time-splitting technique.During the present study field experiments have been carried out, which consisted in monitoring solute plume via tracer tests in a heterogeneous aquifer. Concentration data are then used for aquifer parameter identification, necessary for model calibration. The movement of a saline tracer in the subsurface has been monitored via electrical resistivity tomography (ERT) from the surface. The spreading of the solute plume measured in the field experiment permits for an estimate of the actual transport properties in the heterogeneous medium in terms of dispersivity parameters. These parameters are then applied to transport models on a regional scale.The transport model implemented has allowed for a better understanding of the regional groundwater system and of its transport-related properties. The model is suggested to predict well the evolution of real transport phenomena, so it is deemed of a certain importance for the management of water resources in the area." @default.
- W2273923027 created "2016-06-24" @default.
- W2273923027 creator A5021771370 @default.
- W2273923027 date "2009-01-01" @default.
- W2273923027 modified "2023-09-23" @default.
- W2273923027 title "Modello matematico di flusso e trasporto nei sistemi acquiferi dell'Alto Vicentino" @default.
- W2273923027 hasPublicationYear "2009" @default.
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