4.4 Mixed Exchange Wetland

As presented in the discussion of streams and lakes, wetland types are commonly represented in the map views and cross sections as shown in Figures 16 through 22; and in Figures 32 through 36 by substituting the word wetland for the labeled streams and lakes, respectively. However, wetland exchange can be more complex in these mixed exchange settings (Figure 47). Field investigation of wetlands may require detailed analyses of groundwater exchange. Section 5 presents methods for such analysis.

Schematic cross section and map view showing a mixed exchange wetland dominated by both effluent and influent groundwater conditions
Figure 47 – Schematic cross section and map view showing a mixed exchange wetland dominated by both effluent and influent groundwater conditions. In this setting some surface-water outflow may occur. Equipotential lines and relative head values are in black. Groundwater flow lines are in blue. Isotropic and homogeneous conditions are assumed. Monitoring wells are open at the bottom. a) A cross sectional view of a mixed exchange wetland. b) A map view of a mixed exchange wetland (Woessner, 2020).

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Groundwater-Surface Water Exchange Copyright © 2020 by William W. Woessner. All Rights Reserved.