4 Tests and Results 



Tests 



Existing conditions 



Prior to testing of the improvement plan, tests were conducted for exist- 

 ing conditions (Plate 1) to establish a base from which to evaluate the ef- 

 fectiveness of the improvement plan. Short period wave-height data were 

 obtained in the cove and harbor entrance and along the center lines of the 

 proposed breakwaters (for design wave information) for the selected test 

 wave conditions. Wave-pattern photographs were secured for representa- 

 tive test waves from the five test directions, and riverine sediment tracer 

 patterns were obtained for various river discharges as well as wave-induced 

 sediment tracer movement and subsequent deposits. Long-period wave 

 test data obtained for existing conditions in previous studies (Bottin, 

 Acuff, and Markle 1988) were used for comparison of test results with the 

 proposed plan. 



Improvement plan 



The improvement plan (Plate 2) consisted of a 400-ft-long offshore 

 breakwater constructed in the cove approximately 2,000 ft from the Noyo 

 River and Harbor jettied entrance. The breakwater had a crest el of +20 ft 

 with side slopes of 1V:1.33H along the trunk and 1V:1.67H at the heads. 

 As stated earlier, the structure was constructed of stone in the model, but 

 represented an accropode armored structure (based on transmission charac- 

 teristics obtained during two-dimensional model testing). Short-period 

 wave-height tests, riverine and wave-induced sediment tracer patterns, 

 and long-period wave tests, as well as wave-pattern photographs, were 

 secured for the proposed improvement plan. 



18 



Chapter 4 Tests and Results 



