A hybrid modeling system (coupled physica and numerical models) was developed to investigate the hydrodynamic and sedimentation processes of Cumberland Sound and the interior Kings Bay navigation channel. The hybrid modeling procedures and the physical and numerical model verifications are described in detail. The Kings Bay physical model was an accurately scaled fixed-bed concrete model of the Cumberland Sound/Kings Bay estuarine system, The physical model provided the means of assessing three-dimensional hydrodynamic characteristics of Cumberlaqd Sound and Kings Bay. It also provided the boundary forcing conditions for the numerical model and an expanded data base for comparison. Verification of the physical model to reproduce pre-Trident channel field measurements collected during November 1982 and transitional channel conditions measured during January 1985 was demonstrated The other component of the modeling system was the US Amy Corps of Engineers Generalized Computer Program System: Open-Channel Flow and Sedimentation, TABS-2. TABS-2 is a complete depth-averaged finite element numerical modeling system. The numerical hydrodynamic model RMA-2V used physical model-derived St, Marys Inlet water levels and tributary velocity measurements for the boundary forcing conditions for an average tidal cycle. The numerical model was verified to physical model tidal elevations and depth-averaged velocity data for interior locations. A wetting and drying algorithm was used to numerically model the extensive marsh and intertidal areas of the estuarine system. Marsh-estuarine circulation interaction and prescribed marsh elevation were found to be important in achieving proper hydrodynamic reproduction, Three separate numerical model schematizations or meshes of the Cumberland Sound system were verified as the submarine channel evolved in detail. RMA-2V demonstrated reasonable reproduction of pre-Trident and transitional channel hydrodynamic conditions for the Cumberland Sound/Kings Bay system. Hydrodynamic results from RMA-2V were used in the numerical sediment transport code STUDH in modeling the interaction of the flow transport and sedimentation on the bed. Both cohesive (clay and silt) and noncohesive (silt and sand) sedimentation were modeled. STUDH was verified through comparisons of model predictions with actual field shoaling rates. Excellent numerical model pre-Trident channel sediment verification was demonstrated. Model predictions for the upper Trident channel. turning basin for the transitional channel demonstrated higher shoaling rates than the limited field data. Possible explanatfons for this difference included low field sediment loads associated with the prolonged east coast drought, the transitional nature of the channel, and the possible need for further model adjustments. The sediment model was developed and verified for long-term average conditions, and additional model adjustments could not be justified based on the limited transitional channel data. Verification of the hydrodynamic and sediment transport hybrid modeling system for Cumberland Sound and Kings Bay navigation channel has been demonstrated. The developed modeling procedures can be used in carefully designed testing programs to assess potential hydrodynamic and sedimentation impacts associated with submarine plan channel and remedial measure alternatives.


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    Titel :

    Verification of the Hydrodynamic and Sediment Transport Hybrid Modeling System for Cumberland Sound and Kings Bay Navigation Channel, Georgia



    Erschienen in:

    Erscheinungsdatum :

    1989


    Format / Umfang :

    7519960


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :


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