Application of a 2-D Water Quality Model (BETTER) to Manage Effects of Low Flow and Wastewater Effluents in Cheatham Lake, Tennesseeby Russ T. Brown, Jones & Stokes Associates, Sacramento, United States,
Harvey Crouch, Jones & Stokes Associates, Sacramento, United States,
Tim Higgs, Jones & Stokes Associates, Sacramento, United States,
Abstract: Applications of BETTER, a 2-D reservoir water quality model, have been made by the Nashville District Corps of Engineers (Corps) and by the Nashville Metropolitan Water and Sewerage Services (METRO) to evaluate the effects of low flow regulation and wastewater effluents on water quality conditions in Cheatham Lake. Data that are collected routinely and for special studies have been integrated into the daily BETTER model results. Reservoir stratification is intermittent, with most water quality effects observed in the downstream portion of the impoundment. Diurnal variations in flow, temperature, and dissolved oxygen (DO) concentrations are significant and an hourly scale simulation may be required. More intensive monitoring of temperature and DO profiles with surface nutrient and chlorophyll samples are required in the downstream segment of the reservoir for accurate model calibration and improved management of river flows and effluent discharges.
Subject Headings: Water quality | Two-dimensional flow | Two-dimensional models | Hydrologic models | Water flow | Low flow | Wastewater management | Quality control | Model accuracy | Water pollution | Computer models | North America | Tennessee | United States | Nashville
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