New challenges in the study of coastal aquifers from numerical modeling. The case of the Motril-Salobreña aquifer Calvache Quesada, María Luisa Blanco Coronas, Ángela M. López Chicano, Manuel Sánchez Úbeda, Juan Pedro Age transport modeling Coastal aquifer Global change Saltwater intrusion Acuífero costero Cambio Global Intrusión marina Modelos de transporte de calor Modelos de transporte de edad Coastal aquifers are frequently complex systems with highly heterogeneous geological charac teristics, specific flow patterns, presence of fluids with different densities, high risk of contamina tion both by salinization and by other pollutants, and highly modified by anthropic activity. Given this situation, numerical modeling becomes the most appropriate tool to determine the potential impact of global change on marine intrusion in this kind of aquifers. The mathematical models traditionally used in coastal aquifers have been those of flow and mass transport with variable density, which allow obtaining a distribution of salinities in the aquifer and reproducing the flow pattern in the area of discharge to the sea. In addition to these models, another type of numerical modeling can be applied that could also provide information on specific aspects of this type of aquifers. The study of the Motril-Salobreña coastal aquifer shows, for example, how heat trans port models allow quantifying the recharge that occurs from rivers that frequently interact with coastal aquifers; as well as the age transport models provide data on the preferential groundwa ter circulation paths and its residence time, very relevant information in these frequently hetero geneous and anisotropic aquifers. Future challenges are directed towards determining the ef fects of sea level rise on marine intrusion and establishing the degree of equilibrium of the freshwater-saltwater contact with the current situation 2023-06-23T08:49:22Z 2023-06-23T08:49:22Z 2022 journal article Calvache, M. L., Blanco-Coronas, Á. M., Duque, C., López-Chicano, M., & Sánchez-Úbeda, J. P. (2022). New challenges in the study of coastal aquifers from numerical modeling. The case of the Motril-Salobreña aquifer. BOLETÍN GEOLÓGICO Y MINERO, 133(1), 211-225.[http://dx.doi.org/10.21701/bolgeomin/133.1/012] https://hdl.handle.net/10481/82762 10.21701/bolgeomin/133.1/012 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Instituto Geologico y Minero de España