Models of diel variations of water quality in a stratified eutrophic reservoir (Lake Livingston, Texas).
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1984.
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| Subjects: | |
| Online Access: | Link to OAKTrust Copy Link to ProQuest Copy |
| Abstract: | A mathematical model has been developed in order to predict variations that may occur in selected physio-chemical parameters over diel cycles. The model consisted of three interrelated segments; a model to predict variations in temperature distributions and mixing regimes; a segment to predict variations in the distributions of pH and dissolved oxygen; and, a segment to predict distributions of zinc among species and surfaces. The model was based upon a vertical segmentation of constant geometry. The calibration and verification of the model was based upon studies conducted on Livingston reservoir, a eutrophic reservoir located near Goodrich, Texas. Field and laboratory studies were first conducted during August and September, 1982. Data were collected for two diel cycles during these preliminary investigations. Data were used to provide insights into the system as well as an initial data base for model calibration. Final studies were then conducted during June and July, 1983, to provide a comprehensive data base for final model calibration and verification. The final studies consisted of a single intensive sampling effort encompassing a 60-hour period of monitoring. The calibrated model was found to adequately represent variations in temperature, pH, and dissolved oxygen that occur over diel cycles. Large diel variations in surface dissolved oxygen concentrations have been reported for the surface layers of this reservoir. Analysis indicated that variations in turbulent mixing may largely influence diel variations in dissolved oxygen distributions. This indicates that assumptions concerning productivity and respiration based upon surface dissolved oxygen concentrations may be in error if the vertical mixing history is not considered. A model for the speciation and adsorption of trace metals was included as an example of an application of the model to predict variations in pH. This analysis indicated that relatively little diel variation may occur in the vertical distribution of zinc among species and surfaces. The majority of zinc at all times appeared to be associated with particulates. Very little free zinc was found to occur in the trophogenic zone. This indicates that little of the total zinc present may be in the form, as free metal ions, considered most toxic to algae. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Civil Engineering." |
| Physical Description: | xv, 359 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references (leaves 274-295). |