determined by an independent equation so that sand volume is 

 not conserved. 



g_. The wave transformation model is not time dependent; it 

 assumes that the offshore bar-trough bathymetry is in 

 equilibrium. The erosion model includes time dependency 

 through use of the rise time of the surge level. 



h. The model has been tested for a range of Florida and gulf 



coast profile changes and found to produce reasonable results. 

 The volumetric relationship (Equations 13 and 14) is based on 

 a limited number of data points but from a wide range of 

 Florida and non-Florida beaches. 



92. The MSBWT model has evolved from a surf zone wave transformation 

 model to a combined wave and beach profile erosion model. Because the model 

 includes a description of many of the important processes associated with 

 dune erosion, further testing and evaluation should be made, particularly 

 with respect to non-Florida, non-gulf coast beaches. Several considerations 

 preclude use of the MSBWT at present. Although numerous reports document 

 various aspects of the model, a report by Balsillie (in preparation) 

 detailing the present model in use by the State of Florida has not been 

 published. Though the code for the model has been published (Balsillie 

 1984c), it is written in the Applied Programming Language, a computational 

 programming language which is seldom encountered in coastal research. 

 Conversion of the complex code to FORTRAN or PASCAL would be time consuming 

 and costly. Finally, the model and the equations and assumptions on which it 

 is based must pass the scrutiny of independent testing and verification. 



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