underlayer stone berm. The right side of Figure 10 (Arrow B) shows an area of 

 where the dolos toe is excessively steep and some dolosse placed in 1982 have 

 been lost down the slope. In general, the underwater condition of the head 

 section included a skimpy dolos cover near the toe, numerous "hangers," and 

 more breakage near the waterline. In the transition section (Figure 11), the 

 underlayer toe is very wide and steeply terraced. The sonograph shows tran- 

 sition from the head (left) to the trunk (right). The dolos toe in this area 

 is very steep and well defined as shown by the changes in pattern along 

 line A-A. Divers observed approximately 25 broken dolosse in this section. 

 Although the breakage was random, there was observational evidence of some 

 movement and instability throughout the dolos cover in this section. 



26. In summary, the result of the various side-scan sonar surveys and 

 diving inspections was the assessment that the underwater condition of the 

 dolos cover has several flaws as a result of initial placement. Of primary 

 concern are apparent depressions which may be "holes" in the dolos pover and 

 sections where the dolos toe is perched. The side-scan sonar records reveal 

 significant variation in the condition of the structure toe throughout the 

 4,400-ft-long rehabilitation. There are areas of little or no underlayer berm 

 and other areas where the toe of the dolos cover is very steep. Also of 

 interest is the amount of new breakage and movement observed in both the head 

 section and transition zone during the 1984 inspection. Apparently, the dolos 

 cover in these areas is still dynamic, and progressive deterioration is 

 occurring. 



27. Cleveland Harbor offered a unique opportunity to view a variety of 

 coastal structures. In addition to the dolos rehabilitated section, images 

 were taken of the laid-up block breakwater sections, rubble-mound faces of 

 dredged material containment dikes, vertical sheet-pile walls, and timber 

 cribs. Figure 12 shows a laid-up block section (linearity caused by reflec- 

 tion off the edge of the stone blocks). Section A has a uniform slope, and 

 section B has a shadowed upper slope which suggests irregularities and a 

 deteriorated condition. Arrow C shows the waterline and D the toe. Debris 

 and stone blocks are noticeable beyond the toe. 



28. An old timber crib section of the west breakwater was inspected 

 from the harbor side (Figure 13). Seams between individual timber cribs were 

 revealed as the acoustic pulse penetrated the joints (A). In addition, those 



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