|V 22 Apr. 1959 IV 8 Mor. 1962 j 1\ 12 Apr. 1968 



Sea Isle City 

 Groins 



Figure 47. Submarine bar (heavy solid lines) 

 characteristics during the spring 

 of two typical years (1959 and 1968) 

 and just after a severe storm (1962) 



Bar presence appears to vary considerably along Ludlam Beach. Figure 48 

 illustrates the percent of time submarine bars were present in the 20 aerial 

 photo sets and the percent of time the submarine bars intersected the coast. 

 Bars were most persistent near the inlets and in the coastal indentations 

 separating the Sea Isle City groins from the inlets. Bars were observed off 

 the Sea Isle City and Strathmere groins in less than 30 percent of the aerial 

 photos. The intersection of bars usually occurred at the southern end of the 

 groin system. 



Ridge-and-runnel systems differ from submarine bars in where they are 

 located. Bars are located seaward of the foreshore; ridge-and-runnel systems 

 are troughs and ridges at the foreshore. They generally indicate an accretion- 

 ary phase on the beach as material from offshore migrates landward on the fore- 

 shore as discrete ridges. The presence of ridge-and-runnel systems at various 



61 



