119. Table 6 summarizes results of the three calibrations and verifica- 
tions. It is concluded that use of the calibrated model with either a vari- 
able or constant maximum depth of closure will produce essentially equivalent 
results. Longshore sediment transport rates associated with the maximum depth 
of closure model will be higher by a factor of about 2. 
Table 6 
Comparison of Calibration and Verification Results 
Ydiff for Ydiff for 
Calibration Verification 
D,(m) Ky Ko (m) (m) 
Variable 0.41 0.10 597 919 
35 0.28 0.15 591 WSe/ 
6.00 0.80 0.10 515 1,094 
i _———_———————————————————————— 
120. Longshore sediment transport rate capacity. The calibrated model 
was used to compute the longshore sediment transport rate capacity from Shark 
River Inlet to Sandy Hook. Transport rate capacity is the potential maxi- 
mum transport rate assuming infinite sediment supply and no interception or 
interruption by structures. The transport rate capacity was calculated with 
GENESIS by removing all groins and the seawall from the 1985 shoreline config- 
uration. The beach could then erode and accrete in response to local breaking 
wave action only. This situation was run to give an indication of the trans- 
port rates which created Sandy Hook, when the coast was in its natural state 
before implementation of shore protection measures. 
121. Calculated longshore sediment transport rate capacities are given 
in Figure 20. Rates were obtained by averaging yearly volumes of transported 
sediment obtained from 3 years of simulated shoreline change with the 3-year 
hindcast wave time series. 
122. Transport rate capacities with a constant maximum depth of closure 
are approximately double those for a variable depth of closure. The magni- 
tudes of these computed transport rate capacities are about one-third those 
obtained by Caldwell (1966) in his arithmetic budget analysis based on long- 
term change in shoreline position at Sandy Hook. 
123. The computed sediment transport is directed to the north, as 
expected, but the difference between output and input rates at the ends of the 
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