Table 2 

 Storm Events 



Duration* Surge Level Wave Ht Fall Vel Number of 

 Location/Date hr m above MSL m m/sec Profiles 



0.0450 3 



0.0450 3 



0.0450 5 



0.0500 3 



Westhampton, N.Y. 

 3 Feb 1972 



6.0 



1.3 



Westhampton, N.Y. 

 19 Feb 1972 



7.0 



1.5 



Long Beach Is, N.J. 

 19 Dec 1977 



9.0 



1.4 



Duck, N.C. 

 14 Nov 1981 



15.5 



1.6 



This is duration as defined by the Vellinga model, the elapsed time the 

 surge level was within 1 m of the peak level. 



either actual (Duck) or approximate offshore data, at several locations. 

 Note that these data were originally selected to satisfy the requirements of 

 the Vellinga model with respect to dune height, width, and slope. This data 

 set was further analyzed in order to derive the input conditions required for 

 use of the Kriebel model. This analysis involved approximating the modeled 

 area by defining a constant dune and berm height, dune and berm face slopes, 

 and berm width. The offshore profile was approximated as monotonically 

 increasing in depth according to the equilibrium profile concept. 



97. The resulting approximations for the geometry of each of the sur- 

 veyed profiles which were used as input for the Kriebel model are presented 

 in Table 3. The value of the shape coefficient A for each of the profiles 

 was selected to best represent the prestorm offshore profile. Since the 

 majority of the profiles are characterized by bar formations, the resulting 

 equilibrium profile represents a smoothing of the existing offshore 

 bathymetry. 



98. An additional parameter required by the Kriebel model is the surge 

 hydrograph, the duration of which differs from that defined by the Vellinga 

 model. The period used for this application represents the duration of the 

 entire storm surge event; whereas the duration used for the Vellinga model 

 only represents the maximum peak. Therefore, the durations shown in Table 3 

 are much longer than those of Table 2. 



48 



