The Chesapeake Bay hydraulic model, an 8.6-acre fixed-bed model, constructed to a horizontal scale ratio of 1:1000 and a vertical ratio of 1:100, reproduces the entire Chesapeake Bay estuarine system from the offshore Atlantic Ocean to the head of tide for all tributaries. The model is equipped with the necessary appurtenances to accurately reproduce and measure tidal heights, tidal currents, salinity distributions, and freshwater inflows. It is the largest and one of the most sophisticated estuarine models of its kind. State-of-the-art modeling techniques continue to be developed and incorporated into the complex model operating system. Complete computer control and data acquisition capabilities ensure accurate and precise monitoring and control throughout the 14-acre shelter. Dynamic testing conditions associated with time-varying freshwater hydrographic conditions and lunar-monthly tidal reproduction are important technological advances utilized at the model. During the summer of 1980, unusual concrete expansion on the model resulted in compression and unequal vertical concrete movement. Damaged areas were remolded and all existing and new expansion joints were widened and filled with a closed cell expansion material. Reverification of the model was required following this rehabilitation effort. This report provides all the necessary information to adequately assess model reverification and model operating capabilities. The nonsynoptic nature and short durations of prototype data greatly complicate the verification process. Model and prototype hydrodynamic characteristics are compared in a manner that clarifies model and prototype response trends while minimizing the amount of noise associated with complex and dynamic prototype conditions. Tide and velocity characteristics are examined under "quasi-steady-state" conditions associated with the reproduction of a repetitive M?cosine tide and a constant, long-term average freshwater discharge and distribution. Salinity characteristics are examined under more dynamic conditions associated with the reproduction of a 12- tidal constituent, 56-cycle tide and a time-varying 4-year freshwater inflow hydrograph simulating the prototype weekly average discharge and distribution. An induced-mixing bubbler system is used to enhance vertical mixing to more accurately reflect prototype salinity structure resulting from wind-associated energy. Simplifications and associated limitations of model boundary conditions used in simulating dynamic prototype conditions are discussed. Direct extrapolation of model results to the prototype should be undertaken with these considerations in mind. When evaluated in such a manner, excellent model reproductions of general prototype tide, velocity, and salinity characteristics are demonstrated. The Chesapeake Bay hydraulic model is shown to be a valuable tool for assessing man-induced changes to the three-dimensional hydrodynamic characteristics of the Chesapeake Bay estuarine system._x000D_ _x000D_ NOTE: This file is large. Allow your browser several minutes to download the file.


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    Titel :

    Reverification of the Chesapeake Bay Model: Chesapeake Bay Hydraulic Model Investigation



    Erschienen in:

    Erscheinungsdatum :

    1985


    Format / Umfang :

    28016104


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :


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