Consider an aquifer in which fresh water of depth h flows over a salt water layer, as sketched in Fig XXXXXXXXXXThe salt water layer is stagnant and has salinity S0, while the inflowing freshwater has...

Consider an aquifer in which fresh water of depth h flows over a salt water layer, as sketched in Fig. 10.34. The salt water layer is stagnant and has salinity S0, while the inflowing freshwater has initial salinity S D 0. The freshwater flow is driven by a mean gradient of 10^-3, and the aquifer has hydraulic conductivity 50 m/day and porosity 0.2. The vertical dispersivity is 2 cm. Except near the entrance, horizontal dispersion may be neglected. Under steady state, calculate the isohaline lines corresponding to S/S₀
= 0.25, 0.5, and 0.75. Assume that h is large. (Note: this type of problem is developed further in Chap. 11.)