with the +7.0-ft swl. Typical wave patterns for the offshore breakwater 

 plan are shown in Photos 21-40. 



Discussion of short-period wave tests 



Results of wave-height tests for existing conditions indicated rough 

 and turbulent wave conditions in the cove and jettied entrance to Noyo 

 River. Considering all test conditions, wave heights ranged from 22.0 to 

 30.9 ft at the proposed breakwater location in the cove and from 12.2 to 

 15.2 ft in the entrance, depending on incident wave direction. For opera- 

 tional wave conditions (14-ft waves or less), wave heights ranged from 

 8.5 to 13.7 ft in the entrance from the various incident wave directions. 



Wave-height tests with the offshore breakwater plan installed revealed 

 8.7- to 14.6-ft waves in the entrance for the various incident wave direc- 

 tions, considering all test conditions. For operational wave conditions, 

 maximum wave heights ranged 6.3 to 9.3 ft in the entrance, depending on 

 incident wave direction. 



Comparisons of maximum wave heights in the Noyo River jettied en- 

 trance for existing conditions and the offshore breakwater plan are shown 

 in Plates 3-12. Wave-height values for test waves from northwest with the 

 0.0- and +7.0-ft swl's (Plates 3 and 4) and from west-northwest with the 

 0.0-ft swl (Plate 5) were similar for both existing conditions and the break- 

 water plan. Most operational waves that exceeded the 6-ft wave-height 

 criterion for existing conditions also exceeded it for the breakwater plan. 

 Test results for waves from west-northwest with the +7.0-ft swl (Plate 6) 

 revealed that 12- to 14-ft incident waves were within the established 6.0-ft 

 criterion for the offshore breakwater plan and exceeded it for existing con- 

 ditions. Results for test waves from west (Plates 7 and 8) indicated that 

 the breakwater plan was slightly better than existing conditions; however, 

 the wave-height criterion was still exceeded for several operational test 

 wave conditions. In general, test waves from west-southwest (Plates 9 

 and 10) and southwest (Plates 11 and 12) resulted in significantly reduced 

 wave heights in the entrance for the offshore breakwater plan versus exist- 

 ing conditions. The wave-height criterion will be exceeded by some oper- 

 ational wave conditions from west-southwest with the +7.0- ft swl 

 (Plate 10). 



An analysis of maximum wave heights obtained in the jettied entrance 

 for existing conditions and the offshore breakwater plan versus the num- 

 ber of occurrences of 14-ft waves or less from Table 3 is shown in the fol- 

 lowing tabulation: 



Chapter 4 Tests and Results 



21 



