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Title: Comparison of numerical and physical hydraulic models, Masonboro Inlet, North Carolina
Authors: Harris, D. Lee, 1916-
Bodine, B. R.
Keywords: Masonboro Inlet, N.C.
Numerical and Physical Hydraulic Models
Tidal Inlets
Publisher: Coastal Engineering Research Center (U.S.) General Investigation of Tidal Inlets Research Program
Engineer Research and Development Center (U.S.)
Description: General Investigation of Tidal Inlets Report
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Abstract: Four models of Masonboro Inlet, North Carolina, have been developed in a program for assessing the value of models in investigating coastal inlet hydraulics problems. A distorted scale, fixed-bed physical model, a lumped parameter numerical model and two two-dimensional numerical models were included in the study. Hydrodynamic equations which describe the two-dimensional flow in tidal inlets are developed in an appendix to this report. The Navier-Stokes equations are integrated vertically and time-averaged to form the governing equations for two-dimensional flow. This procedure eliminates a great deal of unnecessary detail about small -scale motions but retains terms descriptive of the interactions between small- and large-scale flow. Equations are used to investigate the correspondence between model flows. This analysis shows that it should be possible to simulate the major aspects of tidal flow about equally well with either physical or numerical models, that physical models should be most useful for investigating the interaction of the flow of primary importance with boundary conditions or with flows of smaller scale, and that numerical models should be most useful for investigating the interaction between the flow of primary importance and larger scale or external phenomena such as the effects of storms and of the earth's rotation. The assumptions employed in the derivation of the equations used with the lumped parameter model were found to be more restrictive in applications than originally supposed. New equations are presented which display these assumptions more clearly. A comparison of experimental results obtained with a physical model and calculations made with numerical models with the prototype records shows that, in general, the models simulate tidal height more satisfactorily than tidal current. Results obtained with one of the two-dimensional numerical models were much inferior to the results obtained with the other. The basic design of both two-dimensional numerical models was similar, but there were many subtle differences, indicating that a clear understanding of the modeling process is essential to success in modeling tidal flows.
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