Figure 37. Extrapolation of shoreline updrift 

 of Murrells Inlet. 



Results at Murrells Inlet would have indicated a large volume of sand in 

 storage updrift of the jetty. The presence of a groin field updrift of 

 the inlet has had some influence on the shoreline and thus affects the 

 extrapolation. 



A second method of determining the shoreline near the jetties is to apply 

 an analytical model to describe the shoreline evolution in response to inci- 

 dent wave conditions. The most often quoted model is that developed by 

 Pelnard-Considere (1956). LeMehaute and Brebner (1961) and LeMehaute and 

 Soldate (1977) describe the development of an expression for the updrift 

 shoreline and for the amount of sand bypassing. Basically, the shoreline 

 updrift of a groin or jetty as a function of time is given by the expression 

 (variables are defined in Fig. 38) 



tan cu 



y= - 



/ir 



/4te x 2 k 



e - x /it E , 



k 4te V Ate/k 



(17) 



56 



