The assumptions involved in the shoal zone model are limiting, to some ex- 

 tent and confirmatory field evidence is definitely meager, but the present 

 calculation procedure is objective, and seems to be a useful new tool for engi- 

 neering applications. The calculated shoal zone supplements other estimation 

 techniques for the seaward limit (U.S. Army, Corps of Engineers, Coastal 

 Engineering Research Center, 1977); of these other techniques, analysis of 

 sediment character variation along the profile seems the most defendable. 



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