20 
Beach Profile Evolution 
Beach profiles are compared over the period June 1994 to October 1995 to 
examine beach profile evolution. The alongshore locations indicated in 
Figure 15 were selected for evaluating the beach profile evolution within and 
south of the identified hot-spot region (sta 255, 265 ,275, 286, and 290) as well 
as immediately north of the hot spot (sta 208, 224, 232, 240, and 245). These 
profiles are used to evaluate beach profile evolution and associated cross-shore 
and longshore processes present at each location. 
Hot-spot region 
Within and south of the hot-spot region, beach profile evolutions of sta 255, 
265, 275, 286, and 290 are examined. Available beach profile surveys at each 
location are used to discuss the sediment transport processes that contribute to 
the evolution of each profile. 
Station 255 is located near the tip of Groin 44 (New York District 1989), a 
curved groin approximately 4,500 ft (0.85 mile) north of the southern boundary 
of Monmouth Beach. Figure 16 presents the profile surveys for sta 255 from 
June 1994 to October 1995. The evolution of the beach profile at sta 255 
indicates that the groin impounded northbound beach-fill material placed to the 
south of sta 255 prior to construction of the design template in October 1994. 
After placement of beach-fill material in October 1994, the beach profile at 
sta 255 remains relatively stable with only a slight shoreward transition of the 
profile and little cross-shore profile adjustment. It is likely that the stability of 
this profile is due to its proximity to Groin 44. 
Station 265 is located within the area considered the Monmouth Beach hot 
spot. The beach profile surveys shown in Figure 17 indicate dynamic changes 
over time at this location. Placement of the construction template is apparent in 
the October 1994 beach profile. After October 1994, progressive erosion of the 
profile is evident. The beach profile at sta 265 lost 156 cu yd/ft between October 
1994 and October 1995. The net losses of material from the beach profiles at 
this location and lack of evidence that material is moving offshore indicate that 
longshore sediment transport is dominant at this location. 
The beach profiles at sta 275 (Figure 18) indicate placement of the 
construction template between August and September of 1994, then progressive 
erosion of the profile until its condition approaches the prefill condition in 
October 1995. Similar to sta 265, the profile at sta 275 does not indicate any 
cross-shore profile adjustment; instead, there is a net loss of 170 cu yd/ft of 
beach fill between September 1994 and October 1995. 
Chapter 3 Beach Profile Evolution 
