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Wetlands

, Volume 30, Issue 5, pp 997–1006 | Cite as

Wetland-Groundwater Interactions in Subtropical Depressional Wetlands

  • Joong-Hyuk Min
  • Daniel B. Perkins
  • James W. JawitzEmail author
Original Paper

Abstract

Restoration of ditched and drained wetlands in the Lake Okeechobee basin, Florida, USA is currently under study for possible amelioration of anthropogenic phosphorus enrichment of the lake. Here we focus on the dynamic hydrology of these systems, with emphasis on understanding the interaction between wetland surface water and adjacent upland groundwater. Based on natural drawdown events observed over 2 years at four depressional wetlands, hydraulic conductivities (K) of the soils surrounding the wetlands were calculated at the wetland scale (approximately 2 ha) using the modified Dupuit equation under a constrained water budget framework. The drawdown-based average K = 6.6 m/d (range 0.9 to 21.3 m/d) was about three times greater than slug test-based values (1.9 ± 1.5 m/d), which is consistent with scale-dependent expectations. Net groundwater recharge rate at each depressional wetland, calculated based on the mean K, corresponded to approximately 40% of rainfall in the same period (10.0 m3/d). The average net groundwater recharge decreased by approximately 15% if ET was increased by 30%. Variability in estimated K and groundwater flow between the study wetlands was likely due to the relative difference of ditch bottom elevation controlling the surface outflow, as well as the spatial heterogeneity of the soils.

Keywords

Drawdown Groundwater recharge Hydraulic conductivity Isolated wetland Okeechobee basin Water budget 

Notes

Acknowledgments

This research was supported by the Florida Department of Agricultural and Consumer Services, and DBP also received support from a University of Florida Alumni Fellowship. We thank Michael D. Annable, Arne E. Olsen, and Jehangir Bhadha for collecting field data, and two anonymous reviewers for insightful comments that improved an early version of the manuscript.

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Copyright information

© Society of Wetland Scientists 2010

Authors and Affiliations

  • Joong-Hyuk Min
    • 1
  • Daniel B. Perkins
    • 1
  • James W. Jawitz
    • 1
    Email author
  1. 1.Soil and Water Science DepartmentUniversity of FloridaGainesvilleUSA

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