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|Title:||Characterization of aerobic chemical processes in reservoirs : problem description and model formulation|
|Authors:||Environmental and Water Quality Operational Studies (U.S.)|
Chen, Rex L.
Brannon, James M.
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Destratification of hypolimnetic waters produces circulation that moves dissolved oxygen into the anoxic hypolimnion of reservoirs. Destratification increases the dissolved oxygen content of anoxic water and results in decreased concentrations of the dissolved forms of iron, manganese, ammonium, phosphorus, and hydrogen sulfide. Aeration also affects water pH and temperature and redox potential, which change the transformation rate of various chemicals in reservoir ecosystems. A thorough review of existing literature indicates that the factors affecting oxidation of nutrients and metals are highly site specific. This report discusses oxidation pathways of chemicals and important environmental parameters that affect the transformation rate of selected nutrients and metals in lakes and reservoirs and presents a model for predicting the transition from anaerobic to aerobic conditions. In order to better demonstrate the necessary components for an aerobic predictive model, consideration was given to the basic concepts of the most commonly available equilibrium models for predicting water quality in lakes. Evaluation of the practicality of available models revealed that, although equilibrium models provide the flexible and comprehensive approaches necessary for water quality prediction, rate models are more precise and reliable in their depiction of the transition from anoxic to aerobic conditions in reservoirs. Oxidation rates of selected nutrients and metals in U.S. Army Corps of Engineers reservoirs were determined in environmentally controlled laboratory investigations; field measurements of the fate of reduced iron and manganese in the anoxic bottom water of Eau Galle Reservoir, Wisconsin, during destratification corroborated the laboratory results. These oxidation rate coefficients will form the basic input variables for RE-AERS, a reaeration subroutine of the water quality evaluation model CE-QUAL-R1.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|
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