Two additional parameters are considered: a = ramp slope and b = ramp 

 intercept depth at tlie shoreline (when the straight-line ramp is extended 

 landward to the shoreline). The shoreface-ramp boundary, 3c, is the 

 characteristic horizontal distance that is first selected from a profile. 

 However, because irregularities in the shape of the lower part of the 

 shoreface are not uncommon, the region between c and 3c is not useful 

 in evaluating the goodness of fit of a mathematically generated curve 

 to the actual profile (App. D) . Consequently, only the upper part of 

 the shoreface was used for that purpose. 



The ramp sector is approximated by the equation of a straight line. 

 The shoreface sector is approximated by an exponential curve with the 

 slope steepest near the shore and, usually, the maximum concavity near 

 the ramp. An empirical term combines the shoreface and ramp sectors. 

 The result is the equation 



z = (1-G) (ax + b) + G Vg\l-exp / / (1) 



where 



z = bottom depth below MLW datum 



G = term to combine the shoreface and ramp sectors 



X = distance seaward of the shoreline 



g = depth at shoreface-ramp boundary 



f = exponent defining concavity of shoreface 



G is defined as 



G = exp 



"--(fe)" 



