This report documents tie application of a two-dimensional, laterally averaged, numerical model of hydrodynamics and water quality (CE-QUU-W2) to Cordell Hull Reservoir, Tennessee. This reservoir is part of a system of Corps of Engineers-operated reservoirs in the Cumberland River Basin. Although not problematic within Cordell Hull Reservoir, unacceptably low dissolved oxygen concentrations farther downstream in the system of reservoirs have caused concern. This model study was undertaken as part of a potentially system-wide modeling effort to evaluate, without risking possible environmental degradation by experimentation at prototype structures, the water quality (specifically tennperature and dissolved oxygen) impacts of operational changes at individual reservoir outlet structures. Additionally, this particular study was designed to reveal the interactions between hydrodpmics and stratification within Cordell Hull Reservoir. Unstable stratification is thought to be responsible for-two additional problems in this reservoir: the absence of an anticipated substantial fishery and a less than desirable amount of contact recreation. The concept of installing submerged weirs at the mouths of two of the reservoir's embayments within an established recreational site was proposed to help alleviate these two problems. As Cordell Hull Lock and Dam operates as a run-of-the-river navigation project on the main-stem Cumberland River, no significant operational changes at this site are possible. The reservoir is characterized by high flows, intermittent moderate to weak thermal stratification, and a relatively shallow pool (maximum depth less than 25 m). These factors combine, as was demonstrated by the model testing resul.ts, to preclude significant control over the release quality characteristics. However, the advective nature of the reservoir presents an advantage. Any changes to the quality of incoming water of Cordell Hull Reservoir will be propagated downstream, largely intact. It was concluded, therefore, that changes in the quality of releases from the storage impoundments upstream of Cordell Bull Resewoir might impact the water quality a considerable distance downstream. The hydrodynamics within the reservoir were found to be relatively insensitive to the degree of stratification. Thermal stratification was found to remain moderate to weak from the usual top-to-bottom withdrawal patterns in the reservoir. The results of testing with the proposed weirs were mixed, as anticipated. Placement of the weirs resulted in the desired stably stratified environment, but also permitted significant depletion of dissolved oxygen concentrations within the embayments. The boundary condition input data are shown in Appendix A, and a sensitivity analysis performed on the data is described in Appendix B.


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    Titel :

    Application of a Two-Dimensional Model of Hydrodynamics and Water Quality (CE-QUAL-W2) to Cordell Hull Reservoir, Tennessee



    Erschienen in:

    Erscheinungsdatum :

    1988


    Format / Umfang :

    4503767


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :



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