Analysis of Techniques to Limit Saltwater Intrusion in Coastal Aquifers

摘要

In this study, saltwater intrusion in coastal aquifers and prevention techniques were investigated using a new computer model, the Sea Water Intrusion (SWI) package (Bakker and Schaars, 2005), which simulates three-dimensional regional seawater intrusion in coastal multi-aquifer systems. Prevention methods consisting of injection wells, extraction wells, a combination of injection and extraction wells, and a subsurface barrier were evaluated as means of controlling saltwater intrusion by using SWI to simulate groundwater flow in an idealized rectangular coastal aquifer with a pumping well. For the first case, a line of injection wells was located along the column between the sea and the pumping well. For the second case, a line of extraction wells pumping saltwater was located between the sea and the pumping well. The third case consisted of a line of injection wells and a line of extraction wells. In order to represent the subsurface barrier, the hydraulic conductivity along a cplumn,towards the sea was reduced. The results obtained were compared to each other, a^l the subsurface barrier technique was determined to give the best result, i.e., it resulted in the least amount of upconing beneath the pumped well.