that the original 7- to 12-ton armor stone may have been an inadequate design 

 for the Incident wave environment. 



North Atlantic Division 



Baltimore District 



24. The south jetty at Ocean City Inlet, Maryland (Figure 27), is the 

 only structure within the Baltimore District that was reported as having 

 significant toe stability problems. The original north and south jetties, 

 both rubble mound, were constructed in 1934 and 1935, respectively. The crown 

 elevation on the shoreward end of the north jetty had to be increased in 1937 

 to stop flow of sand into the inlet. The landward end of the south jetty 

 required extensions in 1956 and 1963 to repair flanking caused by erosion. 

 The south jetty has suffered major deterioration along its outer leg caused by 

 ebb. flow induced scour and undermining of the structure's inlet side toe. 

 During major repair of the south jetty in 1963, the center line of the struc- 

 ture's repair section was offset outward from the inlet (Figure 27). This was 

 done to alleviate the need to fill the massive scour hole that existed where 

 the inlet side of the structure was originally constructed. The ocean side of 

 the existing structure that remained was used as a base against which the in- 

 let side toe of the jetty repair section was positioned. By 1982, the 1963 

 repair section of the south jetty was once again very deteriorated. Like the 

 original, this damage was only on the converging portion of the jetty and was 

 caused by ebb flow induced undermining of the structure's inlet side. In 

 order to prevent failure of the outer end of the south jetty, which would lead 

 to severe inlet shoaling, the scour hole adjacent to the structure was filled 

 with dredge material and capped with stone. The lower portion of the inlet 

 side of the jetty was overlaid with an intermediate stone size, and the 

 remainder of the inlet side slope was covered with primary armor stone. This 

 work was completed during 1983 to 1984, and a typical repair cross section is 

 shown in Figure 27. The majority of the south jetty's original repair section 

 still shows considerable deterioration and is highly overtopped. It is 

 unknown how well the scour protection is performing. It appears that scour on 

 the north side of the inlet has slowed down, and the north jetty is in good 

 condition; however, the overall scour in the throat of the inlet shows no 

 signs of stabilizing. 



40 



