Abstract
In computation of saltwater intrusion processes transient effects, wherein an elevation of salinity above a final steady state occurs, have been observed and termed as ‘overshooting’. To clear the overshooting phenomena a paradigmatic saltwater layer problem is studied. A new analytical solution for two-dimensional unsteady convective and hydrodispersive saltwater spreading in a bilayered aquifer is presented. A good agreement between analytical predictions and numerical results obtained by finite elements is exhibited. Using the analytical solution it has been found that the major factors for the existence and the development of overshooting are the initial conditions of saltwater layering and the difference of the flow velocities between the layers. The results presented in the paper can provide better insight into the mixing process of flowing saltwater layers.
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