Cross 

 Section 



'Depth of Closure" 



(Depth Ructuotes 



According to 



Conditions) 



Seofloor 

 Response 



Normol Strong Bed 

 Agitation By Woves 



Periodic Bed 

 Agitation By Waves 



Littoral Zone 



Shoal Zone 



Offshore Zone 



{Hollermeier 198 To) 



Evidence of Sediment 

 Tronsport 9 Woter Depth 



30m 

 (Wright 1987) 



17m (Hayes1967a, 

 Peorson and Riggs 1981) 



200m 

 (Komar, Neudeck 

 and Kulm 1972) 



Figure 1. Continental shelf cross-sectional profile (site specific to the mid-Atlantic Bight 

 of the United States). D, and d, (from Hallermeier (1981a)) refer to the 

 seaward limit of surf-related effects, and the seaward limit to sand motion by 

 normal waves, respectively 



Most models predicting shoreline change and cross-shore profile shape 

 and changes are based on a profile of equilibrium which recognizes that 

 for a given wave condition or average wave condition there is a profile 

 shape (concave upward) that is in equilibrium with the wave conditions. 

 While useful, this concept ignores the fact that, in addition to wave action, 

 many other processes affect sediment transport. Moreover, cross-shore 

 sediment transport is also affected by the regional geological framework 

 and profile shape, as well as hydrodynamic conditions. 



Purpose 



The purpose of this report is to summarize literature which addresses 

 the exchange of sediment between the beach and the inner shelf through 

 analysis of physical processes, sediment transport, and stratigraphy. Spe- 

 cific topics considered include the following: 



a. Depth of closure and extent of sediment transport landward and 

 seaward of this zone. 



Chapter 1 Introduction 



