The profile survey data were imported into the Intergraph MGE Terrain 
Modeler at a 500-ft alongshore density for each respective survey time period 
The beach profile data were triangulated to define a surface and then 
incorporated into a bathymetric grid with a horizontal resolution of 25 ft. Color- 
shaded contours, shorelines, and plots of bathymetric change presented in this 
chapter were generated using the bathymetric models developed from the beach 
profile survey data. 
Beach-Fill Planform Evolution 
The evolution of the beach-fill planform is important in understanding the 
transport processes that resulted in the high rates of shoreline erosion within the 
hot-spot region. Four plots of nearshore bathymetry are key in understanding 
how the beach fill evolved from prefill condition to the nourished shoreline with 
significant erosion at the hot-spot region. The four bathymetric models defining 
this evolution are given in Figures 278-31, representing the bathymetric 
conditions during February 1993 (prefill), October 1994, March 1995, and 
October 1995, respectively 
The February 1993 bathymetry (Figure 278) represents the prefill conditions 
along the Contract 1A reach of shoreline. Notice the sediment-starved condition 
of the shoreline. Only locations near groins (sta 250, 175, and 140) or where 
shoreline orientation decreases northbound transport potential (sta 195-205) have 
much dry beach. Also notice that the -20-ft contour is in general much straighter 
than the shoreline (which is dictated by the offsets in seawall and revetment 
construction as well as the presence of groins). 
The October 1994 bathymetry (Figure 29) represents the constructed 
condition of the northern portion of the hot-spot region (to sta 255) and the 
adjacent, unnourished beach to the north as the beach-fill placement approached 
completion for the season. Note that construction did not cease until 3 January 
1995,' but material was placed no further north than sta 245° at that time. 
A complete profile survey of Contract 1A was performed in March 1995 to 
establish the condition of the beach fill before resuming construction in April. 
Figure 30 represents the condition of the beach fill from beach profile surveys of 
March 1995. During the period between October 1994 and March 1995, little 
beach-fill material was added to Contract 1A, and the volume that was added was 
placed no further north than Profile 245. Yet during this time, the region 
between sta 200 and 240 gained significant amounts of material, while the region 
' Personal C ommunication, June 1996, Lynn Bocamazo, New York District 
2 Personal Communication, 12 August 1996, Brian Carr, New York District 
Chapter 5 Beach-Fill Planform Adjustment 
37 
