Effectiveness of Barrier Well by Pumping Ratio Control for Saltwater Intrusion: Lab-Scale Experiments and Numerical Modeling

University essay from Lunds universitet/Avdelningen för Teknisk vattenresurslära

Abstract: Saltwater intrusion is the most challenging problem in coastal regions. To prevent saltwater intrusion, saltwater pumping from a barrier well is widely applied, which is a direct abstraction of intruded saltwater from a coastal aquifer. Owing to its easy installation, many studies have been carried out. However, quantitative relationships between barrier and inland production well have not been revealed. Therefore, in this study, basic lab-scale experiments were conducted to examine the effectiveness of a barrier well on the possible pumping amount of a production well. In the lab-scale experiments, pumping ratio between barrier and production wells was changed from 0.9 to 2.6. As a result, the critical pumping ratio of 1.9 was obtained. Moreover, a two-dimensional numerical model was created to analyze the experimental results. As a result of simulation, the barrier well extracted highly concentrated saltwater when the pumping ratio was less than the critical ratio, which had a large effect to prevent saltwater intrusion. Therefore, it is concluded that there is a critical pumping ratio between barrier and production well. Moreover, barrier well can prevent saltwater intrusion by extracting highly concentrated saltwater as long as the pumping ratio is kept less than the critical ratio.

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