(c) a theoretical study where the modes of oscillation and 

 resonant periods of the bodies of water (bay and shelf resonance) 

 surroiinding the problem area are determined, is usually required 

 before the model can be designed; 



(d) the longer wavelengths require a larger area of the 

 surrounding ocean waters to be included within the model 

 boundaries; 



(e) a large volume of low-reflection, wave absorber-filter 

 material must be used around the ocean boundaries of the model; 

 and 



(f) the testing program is usually very tedious and time 

 consuming because of the large number of wave conditions that 

 must be investigated. 



The Monterey Harbor wave and surge action model study, which involved 

 short-, intermediate, and long-period wave investigations, cost about 

 $121,000. The area of the model was 7,800 square feet and the operating 

 time was 7 months. The investigation was performed in 1966-67. The cost 

 of such a study in 1976 would be about $170,000, exclusive of the costs 

 of collecting the necessary prototype data and the performing of a theo- 

 retical study to ensure a sound basis of designing and operating the 

 model . 



280 



