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20. ABSTRACT (Continued), 



revetment within the limits of still-water levels and wave 

 periods that could be expected to occur in the prototype area. 

 These tests led to the development of a storm-surge hydrograph 

 to which the seawall-revetment sections were subjected. The 

 hydrograph included still-water levels of +2.6, +4.3, +6.9, and 

 +8.6 ft mean sea level and wave periods of 6, 8, 10, 12, and 

 14 sec. The most severe breaking wave heights ranged from 

 9.0 to 17.0 ft. 



b. Several stone revetment sections were tested under the worst 

 breaking wave conditions to optimize the geometry and stone 

 sizes. Results indicated that the revetment plan characterized 

 by 6.3-ton primary armor stone would be an adequate design. 



c. Pressure tests were conducted to determine the distribution of 

 wave forces on the seawall so that the seawall could be designed 

 to withstand the resultant forces and ensure stability against 

 overturning and sliding. The seawall geometries tested Included 

 a vertical wall and two recurved walls. The two recurved sea- 

 walls were very similar in design; however, one included a 

 slightly different crown geometry designed to reduce over- 

 topping. Results indicated that the modified recurved seawall 

 (Plan R4S3) was the most suitable design tested in terms of 

 minimizing pressures on the face of the wall and reducing runup 

 and overtopping. 



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