Wetlands

, Volume 21, Issue 4, pp 614–628 | Cite as

Estimating evapotranspiration in natural and constructed wetlands

Article

Abstract

Difficulties in accurately calculating evapotranspiration (ET) in wetlands can lead to inaccurate water balances—information important for many compensatory mitigation projects. Simple meteorological methods or off-site ET data often are used to estimate ET, but these approaches do not include potentially important site-specific factors such as plant community, root-zone water levels, and soil properties. The objective of this study was to compare a commonly used meterological estimate of potential evapotranspiration (PET) with direct measurements of ET (lysimeters and water-table fluctuations) and small-scale root-zone geochemistry in a natural and constructed wetland system. Unlike what has been commonly noted, the results of the study demonstrated that the commonly used Penman combination method of estimating PET underestimated the ET that was measured directly in the natural wetland over most of the growing season. This result is likely due to surface heterogeneity and related roughness efffects not included in the simple PET estimate. The meterological method more closely approximated season-long measured ET rates in the constructed wetland but may overestimate the ET rate late in the growing season. ET rates also were temporally variable in wetlands over a range of time scales because they can be influenced by the relation of the water table to the root zone and the timing of plant senescence. Small-scale geochemical sampling of the shallow root zone was able to provide an independent evaluation of ET rates, supporting the identification of higher ET rates in the natural wetlands and differences in temporal ET rates due to the timing of senescence. These discrepancies illustrate potential problems with extrapolating off-site estimates of ET or single measurements of ET from a site over space or time.

Key Words

evapotranspiration water budget PET lysimeters hydrology geochemistry 

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Literature Cited

  1. Abtew, W. 1996. Evapotranspiration measurements and modeling for three wetland systems in south Florida. Water Resources Bulletin 32:465–473.Google Scholar
  2. Abtew, W. and J. Obeysekera. 1995. Lysimeter study of evapotranspiration of cattails and comparison of three estimation methods. Transactions of the American Society of Agricultural Engineers 38:121–129.Google Scholar
  3. Armstrong, J. and W. Armstrong. 1991. A convective throughflow of gases in Phragmites australis. Aquatic Botany 39:75–88.CrossRefGoogle Scholar
  4. Armstrong, J., W. Armstrong, P. M. Beckett, J. E. Halder, S. Lythe, R. Holt, and A. Sinclair. 1996. Pathways of aeration and the mechanisms and beneficial effects of humidity- and Venturi-induced convections in Phragmites australis. Aquatic Botany 54:177–197.CrossRefGoogle Scholar
  5. Bravo, H. and G. H. Brown. 1998. 3-D Modeling of groundwater hydrology in a wetland. Advances in Environmental Research 2: 153–166.Google Scholar
  6. Carter, V. 1986. An overview of the hydrologic concerns related to wetlands in the United States, Canadian Journal of Botany 64:364–374.CrossRefGoogle Scholar
  7. Campbell, D. L. and J. L. Williamson. 1997. Evaporation from a raised peat bog. Journal of Hydrology 193:142–160.CrossRefGoogle Scholar
  8. Campbell, G. S. and J. M. Norman. 2000. An Introduction to Environmental Biophysics, 2nd ed. Springer-Verlag, Heidelburg, Germany.Google Scholar
  9. Chanton, J. P. and G. J. Whiting. 1996. Methane stable isotope distributions as indicators of gas transport mechanisms in emergent aquatic plants. A quatic Botany 54:227–236.Google Scholar
  10. Conservation Foundation. 1988. Protecting America’s Wetlands: an Action Agenda; the Final Report of the National Wetlands Policy Forum. Conservation Foundation, Washington, DC, USA.Google Scholar
  11. Dacey, J. W. H. 1981a. Pressurized ventilation in the yellow waterlily. Ecology 62:1137–1147.CrossRefGoogle Scholar
  12. Dacey, J. W. H 1981b. How aquatic plants ventilate. Oceanus 24:43–51.Google Scholar
  13. Dooge, J. 1972. The water balance of bogs and fens. p. 233–271. In Proceedings of the Minsk Symposium. UNESCO Press. Paris, France.Google Scholar
  14. Dunne, T. and L. B. Leopold. 1978. Water in Environmental Planning. W. H. Freeman and Company, New York, NY, USA.Google Scholar
  15. Epstein, S. and T. Mayeda. 1953. Variation of 18O content of water from natural sources. Geochimica Cosmochimica Acta 4:213–244.CrossRefGoogle Scholar
  16. Gerla, P. 1992. The relationship of water-table changes to the capillary fringe, evapotranspiration, and precipitation in intermittent wetlands. Wetlands 12:91–98.Google Scholar
  17. Grosse, W., H. Buchel, and H. Tiebel. 1991. Pressuzired ventilation in wetland plants. Aquatic Botany 39:98–98.CrossRefGoogle Scholar
  18. Hammer, D. E. and R. H. Kadlec. 1986. A model for wetlands surface water dynamics. Water Resources Research 22:1951–1958.CrossRefGoogle Scholar
  19. Harbeck, G. E., Jr., M. A. Kohler, and G. E. Koberg, 1958. Waterloss investigations; Lake Mead studies. U.S. Geological Survey Professional Paper 298.Google Scholar
  20. Heliotis, F. D. and C. B. DeWitt. 1987. Rapid water table responses to rainfall in a northern peatland ecosystem. Water Resources Bulletin 23:1011–1016.Google Scholar
  21. Hesslein, R. H. 1976. An in situ sampler for close interval porewater studies. Limnology and Oceanography 21:912–914.CrossRefGoogle Scholar
  22. Hughes, P. E., J. S. Hannuksela, and W. J. Danchuck. 1981. Flood of July 15, 1978 on the Kickapoo River, Southwestern Wisconsin. U.S. Geological Survey Hydrologic Investigations Atlas HA 653.Google Scholar
  23. Hunt, R. J. 1992. Simulation of drainage ditch and adjacent wetland creation effects on a wetland system using analytic elements. p. 552. In Wetlands: Proceedings of the 13th Annual Conference of the Society of Wetland Scientists, New Orleans, LA. Society of Wetland Scientists. Lawrence, KS, USA.Google Scholar
  24. Hunt, R. J., D. P. Krabbenhoft, and M. P. Anderson. 1996. Groundwater inflow measurements in wetlands systems. Water Resources Research 32:495–507.CrossRefGoogle Scholar
  25. Hunt, R. J., D. P. Krabbenhoft, and M. P. Anderson. 1997. Assessing hydrogeochemical heterogeneity in natural and constructed wetlands. Biogeochemistry 34:271–293.CrossRefGoogle Scholar
  26. Hunt, R. J., T. D. Bullen, D. P. Krabbenhoft, 1999a. Characterizing hydrology and the importance of ground-water discharge in natural and constructed wetlands. Wetlands 19:458–472.CrossRefGoogle Scholar
  27. Hunt, R. J., J. O. Jackson, G. L. Running, D. P. Krabbenhoft, and J. T. Krohelski. 1999b. Hydrogeological, geomorphological, and vegetative investigations of select wetland creation and restoration projects. Federal Highways Administration. Washington, DC, USA. Madison, WI: Department of Transportation Technical Report SPR-0092-45-91.Google Scholar
  28. Idso, S. B. 1981. Relative rates of evaporative water losses from open and vegetation convered water bodies. Water Resources Bulletin 17:46–48.Google Scholar
  29. Idso, S. B. and M. G. Anderson. 1988. A comparison of two recent studies of transpirational water loss from emergent aquatic macrophytes. Aquatic Botany 31:191–195.CrossRefGoogle Scholar
  30. Kadlec, R. H. and R. L. Knight. 1996. Treatment Wetlands. CRC Press, Boca Raton, FL, USA.Google Scholar
  31. Koerselman, W. and B. Beltman. 1988. Evapotranspiration from fens in relation to Penman’s potential free water evaporation (E) and pan evaporation. Aquatic Botany 31:307–320.CrossRefGoogle Scholar
  32. Krabbenhoft, D. P., C. J. Bowser, M. P. Anderson, and J. W. Valley. 1990. Estimating ground water exchange with lakes, 1, The stable isotope method. Water Resources Research 26:2445–2453.Google Scholar
  33. Kusler, J. A. and M. E. Kentula. 1989. Wetland Creation and Restoration: the Status of the Science, vol. 1- Regional Review, U.S. Environmental Protection Agency, Washington, DC, USA. Report 600/3-89/038a.Google Scholar
  34. LaBaugh, J. W. 1986. Wetland system studies from a hydrologic perspective. Water Resources Bulletin 22:1–10.Google Scholar
  35. Lefleur, M. and W. R. Rouse. 1988. The influence of surface cover and climate on energy partitioning and evaporation in a subarctic wetland. Boundary Layer Meteorology 44:327–347.CrossRefGoogle Scholar
  36. Lafleur, P. M. and N. T. Roulet. 1992. A comparison of evaporation rates from two fens of the Hudson Bay Lowland. Aquatic Botany 44:59–69.CrossRefGoogle Scholar
  37. Linsley, R. K. M. A. Kohler, and J. L. H. Paulhus. 1982. Hydrology for Engineers. McGraw-Hill Company, New York, NY, USA.Google Scholar
  38. Lott, R. B. 1997. Estimating evapotranspiration in natural and constructed wetlands: traditional and geochemical approaches, M.S. Thesis, University of Wisconsin-Madison, Madison, WI, USA.Google Scholar
  39. McGuinness, J. L. and E. F. Bordne. 1972. A comparison of lysimeter-derived potential evapotranspiration with computed values. Agricultural Research Service, U.S. Departments of Agriculture, Washington, DC, USA: Technical Bulletin 1452.Google Scholar
  40. Mitsch, W. J. and J. G. Gosselink. 1993. Wetlands. Van Nostrand Reinhold Company. New York, NY, USA.Google Scholar
  41. National Cooperative Highway Research Program. 1996. Guidelines for the Development of Wetland Replacement Areas. National Academy Press Washington, DC, USA. NCHRP Report 379.Google Scholar
  42. National Research Council. 1995. Wetlands: Characteristics and Boundaries, National Academy Press, Washington, DC, USA.Google Scholar
  43. O’Brien, A. L. 1982. Rapid water table rise. Water Resources Bulletin 18:713–715.Google Scholar
  44. Owen, C. R. 1993. Policy-relevant science: hydrologic functions of an urban wetland. Ph.D. Dissertation University of Wisconsin-Madison, Madison, WI, USA.Google Scholar
  45. Owen, C. R. 1995. Water budget and flow patterns in an urban wetland. Journal of Hydrology 169:171–187.CrossRefGoogle Scholar
  46. Price, J. S. 1994. Evapotranspiration from a lakeshore Typha marsh on Lake Ontario. Aquatic Botany 48:261–272.CrossRefGoogle Scholar
  47. Rushton, B. 1996. Hydrologic budget for a freshwater marsh in Florida. Water Resources Bulletin 32:13–21.Google Scholar
  48. Scheffe, R. D. 1978. Estimation and prediction of summer evapotranspiration from a northern wetland. Master’s Thesis. University of Michigan. Ann Arbor, MI, USA.Google Scholar
  49. Souch, C., C. S. B. Grimmond, and C. Wolfe. 1998. Evapotranspiration rates from wetlands with different disturbance histories. Wetlands 18:216–229.Google Scholar
  50. Stauffer, R. E. 1985. Use of solute tracers released by weathering to estimate groundwater inflow seepage to lakes. Environmental Science and Technology 19:405–411.CrossRefGoogle Scholar
  51. Sturrock, A. M., T. C. Winter, and D. O. Rosenberry. 1992. Energy budget evaporation from Williams Lake: a closed lake in north central Minnesota. Water Resources Research 28:1605–1617.CrossRefGoogle Scholar
  52. Thompson, M. A., D. I. Campbell, and R. Spronken-Smith. 1999. Evaporation from natural and modified raised peat bogs in New Zealand. Agricultural and Forest Meteorology 95:85–98.CrossRefGoogle Scholar
  53. Todd, D. K. 1964. Groundwater. p. 13.1–13.55. In V. T. Chow (ed.) Handbook of Applied Hydrology McGraw-Hill. New York, NY, USA.Google Scholar
  54. Winter, T. C. 1981. Uncertainties in estimating the water balance of lakes. Water Resources Bulletin 17:82–115.Google Scholar
  55. Yin, Z. Y. and G. A. Brook. 1992. Evapotranspiration in the Okefenokee Swamp watershed: a comparison of temperature-based and water balance methods. Journal of Hydrology 131:293–312.CrossRefGoogle Scholar

Copyright information

© Society of Wetland Scientists 2001

Authors and Affiliations

  1. 1.U.S. Geological Survey-Water Resources DivisionMiddletonUSA
  2. 2.Farnsworth Group, Inc.BloomingtonUSA

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