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Politecnico di Milano (2017)

Seawater intrusion and pumping wells in coastal aquifers


Titre : Seawater intrusion and pumping wells in coastal aquifers


Université de soutenance : Politecnico di Milano

Grade : Dottorato 2017

inglese The natural balance between freshwater (FW) and seawater (SW) in coastal aquifers can be altered ‎by human activity such as groundwater withdrawals. Seawater (or saltwater) intrusion (SWI) is ‎defined as the movement of SW (from the sea) into the aquifers. Accounting for this phenomenon is ‎a key constraint to groundwater management practices in coastal aquifers. SWI is a common and ‎serious contamination problem in coastal areas where the proximity of aquifers to SW creates unique ‎concerns for the sustainability of the groundwater compartment [FAO, 1997]. Implementing ‎suitable method, to control and prevent seawater intrusion through inland areas and pumping well, is ‎an important issue regarding coastal aquifers studies. Freshwater extraction in coastal aquifers ‎intensifies the importance of SWI phenomena. This issue involves key parameters, which may affect ‎pumping well contamination. The SWI model is simulated considering a partial penetrating pumping ‎well within a homogeneous isotropic porous media. A numerical method is applied to discover the ‎relation between characteristic parameters of SWI and the pumping time in two models, 2D (the ‎model with a pumping well barrier) and 3D (the model with a single pumping well). To avoid SWI ‎through aquifer, prevention technics are defined, applying an extra partial penetrating pumping well, ‎extracting saltwater. The main scopes of this article are to (i) analyze the sensitivity of key ‎parameters to SWI, (ii) discover the coefficient of key parameters as a function of critical pumping ‎time in 2D and 3D SWI problem, and (iii) assess the feasibility of SWI prevention technics in four ‎scenarios in a 3D homogeneous media. The most significant difference has been observed between ‎the two empirical solutions is related to the coefficients of discharge rate and the location of the ‎pumping well. The empirical equations corresponding to two models (2D and 3D) are able to be ‎provided as reliable estimations of contamination threshold pumping time. Concerning SWI ‎prevention, the two first scenarios are represented as influential technics to reduce the SWI ‎contamination at the well. Considering the achievements in this research, the critical pumping time is ‎estimable and subsequently, a sustainable freshwater extraction in coastal aquifers is reached by ‎implementing the provided technics.‎


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