Evaluation of Existing Conditions 
157. An evaluation of existing conditions was requested by CENAN in 
order to document the necessity for developing a beach fill protection plan 
for the project beach complex. An investigation was therefore made of four 
existing profile locations specified by CENAN to be representative of the Sea 
Bright to Ocean Township area. Locations of the profiles are shown in Fig- 
ure 26. Detailed information related to profile locations and shoreline 
change is contained in Appendix D. 
158. Case A. Profile 160, shown in Figure 27, was selected to repre- 
sent a typical cross-section characterized by an existing beach backed by a 
protective seawall. Profile 160 is located in Block 15, the Long Branch south 
block (Figure D1), along which the average rate of shoreline change from 1953- 
1985 was +0.39 m/year (Table D18). The average measured grain size for this 
block is in the range of 0.33-0.37 mm (Table D19). Analysis of the offshore 
profile indicated that the value of the shape parameter A of Equation 6 was 
equal to 0.176 m'/3, corresponding to a sediment diameter of 0.40 mm. 
159. Case B: Profile 82, shown in Figure 28, was selected to represent 
the case of a narrow beach in front of the seawall. This profile is located 
in Block 5 in the Navesink Beach-Normandie Beach area. The average rate of 
shoreline position change for this area was -0.31 m/yr between 1953 and 1985 
(Table D18). Grain size measurements are not available for Navesink Beach, 
but Normandie Beach average grain size varies between 0.35 and 0.60 mm for 
the 1953 and 1985 surveys respectively (Table D19). Data from Normandie 
Beach also show a trend of increasing grain size with distance offshore 
(Table D19). For the 1985 survey, the mean diameter reaches 1.05 mm at the 
-30-ft contour. Analysis of the offshore profile data yielded an A-value of 
0.283 m!/3 | corresponding to a sediment diameter of approximately 1.40 mm. 
This large diameter is characteristic of a surf zone subjected to steep waves 
which remove much of the small-diameter sediment. In addition, the possible 
absence of an adequate supply of fine sediment to replace that lost offshore 
as a result of wave action is indicated. Note that a small subaerial beach 
area is specified as an initial condition; a finite beach initial boundary 
condition is required by the model to give an initial source of material for 
offshore sediment deposition. 
160. Case C. Profile 140, shown in Figure 29, was selected to 
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