Flow and Mixing Calculations for a Two-Dimensional Reservoir Water Quality Model

by Russ T. Brown, Tennessee Technological Univ, Cent, for the Management, Utilization, & Protection of Water Resources,

Document Type: Proceeding Paper

Abstract: A two-dimensional reservoir water quality box model has been developed and applied to several Tennessee Valley Authority reservoirs including a mainstem reservoir that is fully mixed vertically, a mainstem reservoir that is intermittently stratified with a downstream surface wedge and cool underflow, as well as more typical tributary reservoirs with strong stratification and interflow. The reservoir geometry is considered as an array of volume elements, and a daily heat balance computation is used to estimate temperatures of each element. The flow and mixing within the reservoir is approximated using relatively simple algorithms involving daily inflow and outflow, element geometry, matched density deflections, and densimetric Froude numbers to limit density deflections and vertical mixing rates.

Subject Headings: Hydrologic models | Water quality | Reservoirs | Two-dimensional models | Two-dimensional flow | Water flow | Water pollution | Water stratification | Discrete element method | North America | Tennessee | United States

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