Sediment resuspension by wind in a shallow lake of Esteros del Iberá (Argentina): a model based on turbidimetry |
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| Institution: | 1. Área de Ecología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Río San Pedro, 11510-Puerto Real (Cádiz), Spain;2. Laboratorio Centrale di Idrobiologia, Ministero delle Politiche Agricole e Forestali., Via del Caravaggio 107, 00147 Roma, Italy;2. Department of Radiation Oncology, IU Health Methodist Hospital, Indianapolis, IN;1. Instituto de Física, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia;2. Instituto de Física, Universidade Federal de Alagoas, Maceió-AL 57072-970, Brazil;3. Instituto de Física, Universidade Estadual de Campinas - Unicamp, Campinas - SP 13083-859, Brazil;1. University of North Carolina at Chapel Hill, Department of Marine Sciences, Venable Hall, CB 3300, Chapel Hill, NC 27599-3300, USA;2. University of Southern Mississippi, Department of Marine Sciences, Stennis Space Center, MS 395259, USA;3. Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA 30332-0340, USA;4. University of Georgia, Department of Marine Sciences, Rm 220 MARS Building, Athens, GA 30602-3636, USA;5. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA;6. University of California Santa Barbara, Marine Science Institute, Santa Barbara, CA 93106, USA;7. University of Southern Mississippi, Department of Marine Sciences, Hattiesburg, MS 39406, USA;8. Friedrich Schiller University Jena, Otto Schott Institute of Materials Research, D-07743 Jena, Germany |
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| Abstract: | A model based on empirical relationships is used to study frequency and magnitude of the sediment resuspension by wind-induced waves. The model has been developed for Laguna Galarza, a mesotrophic round-shaped shallow lake located in Esteros del Iberá wetland. Given the logistic and accessibility difficulties of this macrosystem, the installation of automated field stations facilitated continuous data acquisition. Using the wave theory, a daily spatial model of resuspension was built from simultaneous time series of hourly measurements of infrared nephelometric turbidity, wind speed and wind direction. The model was used to predict total suspended solids in another lake of the wetland (Laguna Iberá) showing a good agreement with observed field values, even although Laguna Iberá has a more irregular contour and a eutrophic state. Finally, we apply the model to discuss the ecological impacts of resuspension on the distribution of the littoral communities and to characterize the composition of the particulate suspended matter of the limnetic ecosystem. The model was useful to simulate the possible implications of the recent alterations of the wetland water level on the resuspension regime of the open water bodies. |
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