north of Sea Isle City has been eroding at a rate of 3 to 5 feet per year, and 

 at a lower rate south of Sea Isle City. In the past 130 years the length of 

 Ludlam Beach has extended 2,300 feet northward at Corson Inlet and 1,000 feet 

 southward at Townsend Inlet. The concavity of the island embayment has in- 

 creased because the north and south protrusions at the inlets have remained 

 relatively stable while the central part of the island, especially the northern 

 half, has retreated perhaps 700 feet in places. The N. 30° E. orientation of 

 the island has not varied noticeably since 1842. 



b. 1949-74 Changes . Shoreline positions over this 25-year period were 

 measured from aerial photos and converted to rates of shoreline change (Fig. 

 28). The plotted rates are based on the changes in waterline and wetted 

 boundary shorelines. In most cases, the changes from the wetted boundary 

 shorelines were slightly less than the waterline position changes, but the 

 trends were the same. Maximum erosion occurred in the north protrusion (near 

 Corson Inlet) with intermediate erosion in the north and south indentations. 

 Both the central protrusion (near the Sea Isle City groins) and the south 

 protrusion (near Townsend Inlet) were nearly stable (see Fig. 4 for groin 

 history) . 



Erosion 



Townsend r — v i < 1- 



Inlef \ ^ -30 -20 -10 



Accretion 







10 20 30 



Mean Shoreline Position Change (ft/yr) 



Figure 28. Shoreline change for Ludlam Beach, 1949-74 



(obtained from 20 sequential sets of aerial photos). 



40 



