seaward displacement of the entire section. This displacement is most ap- 

 parent in Photo 18, when the altered positions of the stapods and the most 

 seaward primary armor stones are observed. This problem is an inevitable con- 

 sequence of fronting the vertical seawall with a stone revetment and subject- 

 ing the structure to wave conditions of the severity described herein. After 

 consultation with SAW, it was felt that this problem could not be resolved by 

 changing the geometry of the revetment or by further increasing the armor scone 

 weights. Therefore, revetment stability tests of Plan R4S1 were discontinued. 

 Plan R4S2 



29. The revetment portion of Plan R4S2 (Plate 7, and Photos 19 and 20) 

 was identical to Plan R4S1. This plan differed from those previously tested 

 in that the vertical seawall was replaced with a recurved seawall. Details of 

 this wall design are shown in Figure 6. 



REVETMENT 

 SECTION 



fPRESTRESSED CONCRETE 

 SHEET PILE) 



Figure 6. Details of seawall curvature, Plan Ri|S2 



