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- W2184842490 abstract "The study site covers an area of 273 km 2 in the Oristano plain on the western coast of central Sardinia (Italy). In the coastal area, since 1950, intensive agriculture and subsequent urbanization have resulted in overexploitation of the aquifer system and significant deterioration of groundwater quality due to seawater encroachment. The groundwater basin, hosted in the Quaternary alluvia released by the Tirso river, is formed of a shallow phreatic aquifer and a deeper semi-confined aquifer, separated by a possibly discontinuous thin clayey aquitard. Hydrogeological and hydrochemical data [Pala & Cossu, 1994; Barroccu et. al, 1995] do not allow for a precise characterization of this confining layer, but suggest that partial hydraulic connection between the upper and lower aquifer units occurs. In this study we assess the impact of the aquitard on the salt dispersion process by running simulations based on different realizations of its hydraulic conductivity (K) distribution. The proposed methodology consists in three steps: (1) a stochastic approach to generate synthetic realizations of random spatially correlated parameters K, (2) a modeling study, based on a three dimensional coupled flow and transport groundwater model, to simulate for each realization pressure heads and solute concentrations in the aquifer system, and (3) a statistical analysis of the simulated fields. With this strategy we attempt to cover the uncertainty of the model parameter K in the prediction of fluid and solute mass exchange between upper and lower aquifer units in the framework of a rational development on groundwater resources for the study site. DESCRIPTION OF THE STUDY AREA" @default.
- W2184842490 created "2016-06-24" @default.
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- W2184842490 date "2003-01-01" @default.
- W2184842490 modified "2023-09-26" @default.
- W2184842490 title "Estimating the impact of a discontinuous confining layer on the seawater intrusion using a stochastic approach: the Oristano coastal aquifer site (Sardinia, Italy)" @default.
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