River (Gages 11-15 and 19) for wave periods of 60, 90, 95, 110, 115, 130, 

 150, 155, 165, and 185 sec. Resonant peaks (with amplification factors in 

 excess of 1.0) will occur in Noyo Harbor (Gages 16-18) for wave periods 

 of 75, 95, 102.5, 115, and 155 sec. The maximum peak in Dolphin Marina 

 (Gage 20) occurred for a 110-sec wave period with an amplification factor 

 of 0.95. 



Frequency response curves obtained for the offshore breakwater plan 

 also are shown in Plates 14-23. Results indicate that resonant peaks 

 (with amplification factors in excess of 1.0) will occur at various stations 

 in Noyo River for wave periods of 85, 90, 95, 100, 105, 115, 120, 125, 

 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, and 

 200 sec. Resonant peaks with amplification factors greater than 1.0 will 

 occur in Noyo Harbor for wave periods of 90, 95, 100, 105, 110, 115, 120, 

 140, 145, 150, 155, and 160 sec. The maximum peak in Dolphin Marina 

 occurred for a 140-sec wave period and had an amplification factor of 

 0.55. 



Discussion of long-period wave tests 



A comparison of long-period wave test results for existing conditions 

 and the offshore breakwater plan indicates similar frequency response con- 

 ditions in Noyo Harbor. Maximum response factors of 1 .92 and 1 .97 oc- 

 curred for existing conditions and the breakwater plan, respectively, in the 

 southern corner of the harbor (Gage 16). In some cases, response factors 

 were slightly larger for existing conditions for some wave periods, and in 

 other instances, they were slightly larger for the offshore breakwater plan 

 for some wave periods. In general, it appears that construction of the off- 

 shore breakwater will not have any negative impacts on surge conditions 

 in Noyo Harbor. 



Maximum response factors of 0.95 and 0.55 occurred in Dolphin Ma- 

 rina for existing conditions and the offshore breakwater plan, respectively. 

 Frequency response over the entire period range was generally slightly 

 lower for the offshore breakwater plan than for existing conditions. 



A comparison of frequency response in Noyo River indicated maxi- 

 mum values of 2.9 and 2.33, respectively, for existing conditions and the 

 offshore breakwater plan. In the lower reaches of the river, however, for 

 some period ranges the offshore breakwater plan resulted in slightly larger 

 frequency response values with wider peaks than existing conditions did. 

 Since surging has not been a problem in this area in the prototype, it is not 

 expected to become a problem with the offshore breakwater installed. 



26 



Chapter 4 Tests and Results 



