shown. Profile line 7 illustrates a depressed lower shoreface region 

 which lies below the landward ramp extension. Profile line 33 represents 

 an elevated lower shoreface which lies above the ramp extension. 



2. Description of Shelf Profiles . 



A procedure developed to mathematically describe the profile shape 

 is given in Appendix D.. ,- T]je pi;ocedure utilizes data obtained from the 

 profile locations listed in Appendix A. As shown in Figure 5, three 

 boundary points are defined on the profile, as follows: 



(a) The intersection of MLW and the profile which is 

 assigned distance-elevation coordinates (0,0), i.e., the origin; 



(b) the boundary between the upper and lower shoreface 

 which is assigned distance-elevation coordinates (c,d]; and 



(c) the boundary between the lower shoreface and the ramp 

 which is assigned distance-elevation coordinates (3c, g). 



x=0 



Figure 5. Definition sketch of an idealized Inner Continental 

 Shelf profile showing the planar, seaward-dipping, 

 ramp sector and the concave-up shoreface sector. The 

 horizontal origin, x = 0, and vertical origin, z = 0, 

 indicate the MLW shoreline as obtained from NOS 1200 

 series charts. 



