Bakker, M. and Schaars, F. (2013), Modeling Steady Seawater Intrusion With Single-Density Groundwater Codes. Ground Water, 51(1): 135–144. doi: 10.1111/j.1745-6584.2012.00955.x
In the above-referenced research paper, the reported aquitard properties are incorrect in the example application of interface flow in a two-aquifer system. The error occurred because the authors inadvertently forgot to apply the scaling of the vertical hydraulic conductivity of the aquitard (Eq. 30). The results presented in Figs. 10 and 11 are for vertical hydraulic conductivities of the aquitard that vary from 0.16 m/d to 0.002 m/d.
The interface positions in Fig. 10 correspond to aquitard resistances of 25 days, 500 days, 1000 days, and 2000 days, respectively. The results in Fig. 11 are for the case that c=1000 days. The authors thank Charles Fitts of the University of Southern Maine, who reported that there was a problem with the example. He also informed us that his analytic element code AnAqSim can be used to simulate steady interface flow in multi-aquifer systems, not just single-aquifer systems.