Therefore these two angles were selected for testing (see Plate H) . 



Design of Model Breakwater 



12. Plates 4 and 5 and Photos 1-6 show the existing structure as rep- 

 resented in the model. The breakwater was reproduced from sta 31+25 to MO+00, 

 with dolos coverage from Just below mllw up to the crest of the breakwater 

 between sta 3^+70 and 37+00. Dolos used in the model represented 42-ton units 

 in the prototype. Several different configurations, or plans, were tested in 

 an attempt to arrive at a feasible design for the dolos rehabilitation area. 

 These plans are described in Part III. 



Model Construction 



13. The model breakwater was constructed to reproduce, as closely as 

 possible, results of the usual methods of constructing prototype breakwaters. 

 The core material was dampened as it was dumped by bucket or shovel into the 

 flume and then was compacted with hand trowels to simulate natural consolida- 

 tion resulting from wave action during construction of the prototype struc- 

 ture. Once the core material was in place, it was sprayed with a low-velocity 

 water hose to ensure adequate compaction of the material. The underlayer 

 stone then was added by shovel and smoothed to grade by hand or with trowels. 

 No excessive pressure of compaction was applied during placement of the under- 

 layer stone. Except for the toe area of the dolos, armor units used in the 

 cover layers were placed in a random manner corresponding to work performed 



by a general coastal contractor (i.e., they were individually placed but were 

 laid down without special orientation or fitting). Special placement was used 

 for the toe of the rehabilitated dolosse units (i.e., the dolos were placed 

 with their shanks parallel to the slope of the breakwater and their vertical 

 fluke downslope away from the crest), or in the case of transition areas, the 

 vertical fluke faced outward from the body of the dolos section. Any devia- 

 tion from this type of placement is described in the individual test plans. 

 After each test, the armor units were removed from the breakwater, all of the 

 underlayer stones were replaced to the grade of the original test section, and 

 the armor was replaced. 



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