^ 



Profile Line 



Strathmere 



Sea Isle 

 City 



Miles 



EEE 



. Groins 



2 40 

 Bar Presence 

 (pet) 



50 

 Bar Intersection 

 (pet) 



Figure 48. Percent of time submarine bars were present in aerial photos 

 and the percent of time a submarine bar was observed to 

 intersect the coast of Ludlam Beach. Note the decreased bar 

 presence along the Sea Isle City groin system reach of the coast. 



locations on the aerial photos is shown in Figure 49. Ridge -and -runnel systems 

 were most frequent in the indentations north and south of Sea Isle City. 



The average distance of the bars from the shoreline (waterline) is shown in 

 Figure 50. This distance varied between 375 and 850 feet, and averaged about 

 500 feet. In most cases only a single submarine bar was observed. 



It cannot be assumed that wave energy reaching the coast is uniform the 

 length of the barrier island, nor that wave approach direction is constant at 

 the coast. An analysis of the aerial photos, primarily on wave approach direc- 

 tion on submarine bars and on the beach, provided information on the alongshore 

 variation in these parameters. The information is only on relative variations 

 in wave direction and not on the distribution of wave approach angle for a 

 specific location on the beach. 



Wave approach angle, at breaking, was measured on the submarine bars and on 

 the beach (Fig. 51). For the same sets of deepwater waves, such illustrations 



62 



