1p 
Io 
10 
Of the eight profiles surveyed before and after the storm, two 
were at locations where erosion of the beach in front of the 
seawall was so severe that protective material was placed in 
front of the wall during February and March of 1978, before 
the post-storm profiles were taken (Profiles 2 and 3). Two 
profiles contained nonvertical barriers (a sloping concrete 
apron at Profile 4 and a sloping stepped wall at Profile 7) 
which were inappropriate for the model without further modifi- 
cation. An additional profile (Profile 8) was in a location so 
protected by land that accretion of the beach was experienced 
instead of erosion. Obviously, this profile was also inappro- 
priate for a one-dimensional analysis. The remaining three 
profiles (Profiles 1, 5, and 6) were selected for model 
simulation. 
The assumption of one-dimensionality necessary for making this 
type of analysis economically feasible has been previously 
mentioned. The present project area is the Atlantic Ocean 
coast of New Jersey from Sea Bright to Ocean Township. A one- 
dimensional modeling effort is particularly well suited to 
this area since it is located on an open coast and has no 
major structural or natural features which dominate the cross- 
shore flow regime, invalidating the one-dimensional assump- 
tion. Revere Beach, however, is a protected beach which 
appears to be a highly two-dimensional system. As can be seen 
in Figure 24, the beach is located within a small bay (Broad 
Sound), protected to the northeast by a headland. The Febru- 
ary storm originated from the northeast quadrant and winds 
were almost shore parallel during the entire storm event. 
This is clearly not one-dimensional. This was documented in 
the storm summary which reported a considerable amount of 
alongshore transport below NGVD. Use of the Revere Beach data 
was therefore limited to the area above NGVD where erosion of 
the dune in front of the seawall was observed. The assumption 
is therefore made that the offshore two-dimensional effects 
can be considered to have a negligible effect on erosion of 
the dune and berm. This implies that, although the predomi- 
nant transport of sediment seaward of the NGVD shoreline is 
alongshore, the cross-shore component which governs the one- 
dimensional model can still be used to compute dune erosion. 
The conclusion is, therefore, that the Revere Beach data set 
is acceptable for a limited verification of the model (i.e., 
examination of dune erosion and not of offshore erosion and 
deposition patterns). This approach is valid if limitations 
of the basic model are considered during interpretation of the 
results. 
Surge data for the 6-7 February storm event were provided from 
a tide gage in Boston. The maximum surge level was recorded 
to be 10.3 ft NGVD. Due to differences in location and degree 
of sheltering, the surge level at Revere Beach was slightly 
higher since it was reported that the seawall (elevation of 
approximately 15 ft NGVD) was overtopped. This difference in 
surge levels was accounted for in the verification of the 
model. 
15 
