Stability of Dolos and Tribar Overlays for Rehabilitation of Stone-Armored Rubble-Mound Breakwater and Jetty Trunks Subjected to Breaking Waves
COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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An experimental model investigation was conducted to obtain design guidance for dolos and tribar overlays used to rehabilitate stone-armored rubble-mound breakwater and jetty trunks subjected to breaking waves. It was concluded that a. Randomly placed dolos are an acceptable option, provided that a stability coefficient of 12 is used to size the units. b. Dolos stability proved to be sensitive to relative depth dL and relative wave height Hd with minimum stability occurring at the lower values of dL and higher values of Hd i.e., longer wave periods in shallower water. c. Randomly placed tribars are not recommended at slopes steeper than IV on 2H however, they may be used at milder slopes with a stability coefficient of 9. d. Uniformly placed tribars are an acceptable option for a lV-on-1.5H slope, provided they are used in concert with toe buttressing stone, size selection is based on a stability coefficient of 7, and placement of the units replicates that used in the model. e. Tribar stability appears to be insensitive to dL and Hd for both types of placement.
- Civil Engineering