Mixed finite element method of a seawater intrusion problem in confined aquifers Ibtissam Medarhri, Mohamed Farhloul, Khalid Najib, Soumia Slimani and Abdelmalek Zine E3S Web Conf., 314 (2021) 05004 Published online: 26 October 2021 DOI: 10.1051/e3sconf/202131405004