Groundwater seepage nutrient loading in a Florida Lake |
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| Authors: | T.V. Belanger D.F. Mikutel P.A. Churchill |
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| Affiliation: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China;2. Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China;3. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ 85721, USA;1. Texas Water Resources Institute, Texas A&M University, 1500 Research Parkway A110, College Station, TX 77843-2260, USA;2. Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843-2260, USA;1. Instituto de Geociencias (CSIC, UCM), Calle José Antonio Nováis, 2, 3ª planta, 3b, Facultad de Ciencias Geológicas, Univ. Complutense, 28040 Madrid, Spain;2. Swiss Federal Institute of Aquatic Science and Technology, Eawag, Ueberlandstrasse 133, CH-8600 Dübendorf, Switzerland;3. Institute of Geological Sciences and Oeschger Centre of Climate Change Research, University of Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland;4. Department of Environmental Processes and Global Change, Pyrenean Institute of Ecology (IPE-CSIC), Campus de Aula Dei, Avda Montañana 1005, E-50059 Zaragoza, Spain;5. Institute of Earth Sciences Jaume Almera (ICTJA-CSIC), Carrer Lluis Sole i Sabaris s/n, E-08028 Barcelona, Spain;6. Section of Earth Sciences, University of Geneva, Rue des Maraîchers 13, CH-1205 Genève, Switzerland;7. Department of Stratigraphy, Paleontology and Marine Geosciences, Universitat de Barcelona, C/ Marti Franques s/n, E-08028 Barcelona, Spain;8. Instituto Geológico y Minero de España (IGME), C/ Calera 1, E-28760 Tres Cantos, Madrid, Spain |
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| Abstract: | Twenty-five seepage meters were positioned in East Lake Tohopekaliga, Florida, to determine groundwater seepage contributions of water and nutrients to the lake in 1983. Seepage was found to be an important source of water to the lake, contributing 14.3% of the water sources, and rates decreased significantly (P < 0.01) with distance from shore. A comparison of the piezometer and seepage meter techniques for measuring nutrient loading to the lake indicates the direct seepage meter technique overestimated nutrient inputs due to the enclosure to the sediments, possibly resulting in anaerobic conditions and increased release rates of ammonium nitrogen and phosphate. These results suggest that past studies employing this technique may be in error. Nutrient loading, calculated from piezometer nutrient data and seepage meter flow data, show that the groundwater nutrient loading in the lake was significant, contributing 8.7 and 17.6% of the total phosphorus and total nitrogen inputs to the lake, respectively. |
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| Keywords: | groundwater seepage meter nutrient budget water budget piezometer |
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