maximum wind that is moving perpendicular to a shoreline with a speed of 

 15 MPH. This nomogram indicates there is a critical storm size as reflec- 

 ted by the radius of maximum winds, R. For a given pressure drop greater 

 than zero, the highest peak surge is produced for a critical value of R 

 equal to 30 miles and any value of R greater or less than this value 

 results in a lesser value of the peak surge. 



A second factor F^ given in Figures 3-52 and 3-53 adjusts for the 

 effects of variations in bathymetric characteristics along the gulf and 

 Atlantic coasts. A third factor Fm given in Figure 3-54, adjusts for 

 the effects of storm speed and the angle with which the storm track 

 intercepts the coast . 



The predicted peak storm surge Sp is then given by 



Sp = h Fs ^M (3-78) 



Jelesnianski (1972) applied the scheme to the 43 storms given by Harris 

 (1959) that entered land south of New England during the period from 1893 

 to 1957. The peak surges reported by Harris are plotted against the peak 

 surges predicted by the nomograph method in Figure 3-55. The two- 

 dimensional hurricane model and storm surge prediction model described by 

 Jelesnianski (1967) was used for all calcualtions without adjustment for 

 local variations in friction coefficient or other efforts to calibrate 

 the model for individual storms. For many of the hurricanes, the post- 

 storm surveys conducted were of limited scope and probably did not disclose 

 the true peak surge. Thus, at least a part of the spread between observed 

 and computed values must be due to the observed data. In addition to the 

 peak surge, other nomograms for computing other storm surge parameters are 

 given by Jelesnianski (1967). 



An example problem illustrating the use of the nomogram method follows: 

 ************** EXAMPLE PROBLEM ************** 

 GIVEN : Parameters for Hurricane Camille are: 



Ap = 3.19 inches of mercury (in. Hg.) 

 Vp = 13 knots 

 R = 14 nautical miles (n.m.) 



FIND : Estimate peak open-coast surge produced by Hurricane Camille. 



3-120 



