In many regions coastal aquifers are major source of supply of water to various sectors. However indiscriminate pumping from these aquifers leads to seawater intrusion which is difficult to contain. A numerical model is developed to study two-dimensional steady state seawater intrusion problem involving hydrodynamic dispersion in a synthetic multi-layered confined coastal aquifer. The intrusion model is used to investigate efficacy of seawater control measures involving freshwater recharge wells and combined system of freshwater recharge and saltwater discharge wells. The study found that depth of recharge well, its location from the seashore and well head are important parameters that can control the ingress of the diffused interface. As the recharge wells are located closer to the sea shore, push back effect on the 0.5 isochlor is more pronounced. However, increase in depth of the recharge and discharge well has limited effect. The model study found that a combined recharge-discharge wells system is more effective in controlling seawater intrusion compared to the recharge wells approach.
BYU ScholarsArchive Citation
"Diffused Interface Model to Prevent Ingress of Sea Water in Multi-Layer Coastal Aquifers,"
Journal of Spatial Hydrology: Vol. 4
, Article 2.
Available at: https://scholarsarchive.byu.edu/josh/vol4/iss2/2