ranges from 178 ft x 540 ft in the high-resolution region of the Shrewsbury 
River, to 2,720 ft x 3,180 ft along the landward boundary of the grid. The 
nearshore grid used in the surge model is illustrated in Figure 51. 
201. Water depths and land elevations were assigned to grid nodes based 
on information obtained from: 
a. A topographic map (1954, photorevised in 1981) of Sandy Hook 
and Long Branch, New Jersey. 
NOAA Nautical Chart No. 12324 (edition 22, January 1984). 
ce. Shrewsbury River map (May 1985) supplied by CENAN. 
Ina 
Water depths and land elevations used in the calibration are shown in 
Figure 52. 
202. Channel bathymetries were sparsely marked on both the topographic 
map and nautical chart. The 1985 field survey was only conducted for a few 
channel sections: the downstream reach of the Shrewsbury River; the Barley 
Point Reach; and the lower part of the Long Branch Reach. The lack of accu- 
rate data on channel bathymetry from Highland Beach to Sea Bright made channel 
Simulation more complicated and difficult than anticipated. 
Calibration 
203. Before conducting water level simulations, the model was cali- 
brated and verified using data obtained from the study area to ensure the 
accuracy of model results. Tide gages were installed at the following five 
locations (Figure 53): Sandy Hook Bay Marina (TGI), Red Bank (TG2), Rumrunner 
Restaurant (TG3), Mariner's Emporium at Manhasset Creek (TG4), and Locust 
Point Bridge (TG5). Unfortunately, data from TG5 were lost and only a small 
portion of the data from TG4 was available due to mechanical malfunction of 
the gages. 
204. A 35-hr period, from 0700 26 May to 1800 27 May, 1985, was chosen 
for calibration since usable data were available at gages TG1, TG2, and TG3 
and wind data indicated low wind speeds. To account for wind effects during 
the calibration period, field data from TG1 were used to drive the boundary of 
the storm surge model. Previous simulations showed negligible differences 
between the boundary and gage data from the Sandy Hook Bay Marina gage (TG1). 
The model was calibrated and verified by adjusting depths, frictional coeffi- 
cients (Manning's n), channel sizes, and back-bay volumes. Values of the 
coded friction array and Manning's n used in the calibration are shown in 
110 
