Table 3 

 Hindcast Summary 











H 

 mo 



Peak Period 



Date 



m 

 Hurricane 



sec 







Aug 1933 



A. 82 



13.7 



Sep 1933 



3.28 



14.3 



Sep 1936 



3.75 

 Extratropical 



14.3 



Apr 1956 



3.08 



13.3 



Mar 1962 



4.14 



15.4 



Apr 1978 



3.39 



12.2 



hurricane and the March 1962 extratropical storm wave spectra were approved by 

 NAO as the design conditions for the physical model tests. 



17. The hindcast frequency spectra of sea surface variance were com- 

 puted at 26 discrete frequencies for the March 1962 extratropical storm and at 

 20 discrete frequencies for the August 1933 hurricane. Since these spectra 

 were to be the input to a wave generator in a flume, a higher resolution 

 representation was required. This representation was provided by fitting the 

 hindcast spectra to the TMA spectral shape function (Hughes 1984) . TMA is an 

 analytical spectrum representing the depth and frequency dependent trans- 

 formations of a deepwater wave moving into shallow water. Local water depth, 

 significant wave height, peak period, and a set of three spectral shape param- 

 eters allow for the evaluation of the spectrum at any desired frequency and at 

 any desired location shoreward of the initial computational site. The spectra 

 and these results were applied to both the physical model and the beach and 

 dune studies for the Virginia Beach project. 



15 



