AQUACOAST: A Simulation Tool to Explore Coastal Groundwater and Irrigation Farming Interactions

Figure 1

The AQUACOAST model added to Verruijt’s schematization for an idealized unconfined coastal aquifer. h_F is the height of the free groundwater surface (FGS: water table) above sea level (it is not a model parameter), h_S is the depth of the saltwater-freshwater interface (SFI) below sea level (it is not a model parameter), hght is the average height of land surface above sea level, vtmz is the vertical thickness of the mixing zone, dpwl is the depth of pumping wells below sea level, CDSB is the current distance of the SB from the shoreline, CDAB is the current distance of the AB from the shoreline, CDFB is the current distance of the FB from the shoreline, EDSB is the equilibrium distance of the SB from the shoreline, EDFB is the equilibrium distance of the FB from the shoreline, lgth is the coastal aquifer length, slfw is the freshwater salinity, S is the mixing water salinity along the x-axis distance from the shoreline (CDSB ≤ x ≤ CDFB), slmz is the actual average salinity across a line segment connecting FB and AB (CDAB ≤ x ≤ CDFB), slcl is the crop-limiting salinity, and slsw is the saltwater salinity.