PART III: TEST AND RESULTS 

 Plan 1 , 4-ton Dolosse 



13. The proposed 4-ton dolos rehabilitation section (Plan 1, Plate 1 

 and Photos 1 and 2) was a two-layer system of randomly placed dolosse on a 

 1V-on-2H lakeside slope. The dolosse coverage extended from a 13-ft-wide 

 crown (elevation +10.3 ft lwd) to a toe berm elevation of -22.0 ft lwd. Plan 1 

 was exposed to the wave and swl conditions of Hydrograph A (Table 1). During 

 Step 1 , minor to moderate rocking of several dolosse was observed around the 

 swl and on the upper slope and crown. Two dolosse were displaced from the 

 dolos crown area onto the old laid-up stone crown and one of these dolos then 

 was displaced onto the harbor-side slope during a later cycle of Step 1 . It 

 also was noted that the combined upslope packing and downslope consolidation 

 of the dolos armor around the swl created an area of dolos separation around 

 the swl. In this area, the dolos armor porosity was much higher than other 

 areas of the structure and the underlayer had become very visible but was 

 showing no signs of movement. Four additional dolosse were displaced from the 

 crown onto the harbor-side slope and one dolos originally placed below the swl 

 was displaced down the lakeside slope during Step 2. The severity of dolos 

 rocking and number of units rocking seemed to increase slightly at the start 

 of this step, but appeared to decrease in severity by the end of Step 2. The 

 wave conditions of Steps 1 and 2 produced moderate to significant overtopping 

 while major overtopping was observed during Step 3 of Hydrograph A. It ap- 

 peared that the 9-sec waves were not impacting as hard on the dolos, but that 

 most of the wave energy was passing over the breakwater crown and was being 

 dissipated on the harbor-side of the structure. No additional displacement 

 occurred during this step and the amount of dolos rocking appeared to have 

 decreased from that observed during the previous step. At the end of Hydro- 

 graph A, the dolos armor showed minor spot damage on the breakwater crown, 

 slight localized damage on the lower lakeside slope, and moderate amounts of 

 dolos reorientation around the swl (Photos 3 and 4). The dolos reorientation 

 around the swl was the result of the upslope packing and downslope consolida- 

 tion of dolosse that occurred during Step 1 and did not seem to increase in 

 severity during Steps 2 and 3 of Hydrograph A. 



14. The structure showed only minor to moderate rocking of a few 



11 



