Abstract
The proper characterization of salinization due to seawater intrusion requires an appropriate
hydrodynamic modeling system, not being enough the knowledge of flows to the sea - based
on hydrogeological budgets, or in flow models not able to account for variable density effects.
A new mathematical model of Plana de Oropesa-Torreblanca (groundwater body 080.110),
three-dimensional and transient, is presented. It accounts for the effects of variable density
flow and transport (based on SEAWAT). It is built using as initial approach previous 2D
models, it comprises the water body indicated above and includes a greater spatial resolution
and parameterization. Its calibration is based on transient piezometric head data and salinity
measurements. Results confirm the intrusion process characterized in previous studies, and
the stabilization of it due to changes in the exploitation of the system. However, average
annual intrusion is estimated as nearly three times higher than it was in previous models; besides, the lateral recharge to the aquifer might be considerably higher than in previous
models as inferred from the new calibration of the system. The new model is closer to the real
formation conditions than previous models; thus, it can be the basic tool for long-term
predictions that account for exploitation changes as well as for hydrological and sea level
changes due to climate change. However, it will be necessary reconsidering some of the
hydrogeological and hydrodynamic definitions on the base of future studies.
