Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE 



REPORT DOCUMENTATION PAGE 



Form Approved 

 OMBNo 0704 0188 

 Exp Date Jun30. 1986 



REPORT SECURITY CLASSIFICATION 



Unclassified 



1b RESTRICTIVE MARKINGS 



2a SECURITY CLASSIFICATION AUTHORITY 



2b. DECLASSIFICATION /DOWNGRADING SCHEDULE 



3 DISTRIBUTION /AVAILABILITY OF REPORT 



Available for public release; distribution 

 unlimited. 



4 PERFORMING ORGANIZATION REPORT NUMBER(S) 

 Technical Report REMR-CO-4 



5 MONITORING ORGANIZATION REPORT NUMBER(S) 



6a NAME OF PERFORMING ORGANIZATION 



USAEWES, Coastal Engineering 

 Research Center 



6b. OFFICE SYMBOL 

 (If applicable) 



WESCW 



NAME OF MONITORING ORGANIZATION 



6c. ADDRESS (City, State, and ZIP Code) 



PO Box 631 



Vicksburg, MS 39180-0631 



7b ADDRESS (Oty, State, and ZIP Code) 



8a. NAME OF FUNDING /SPONSORING 

 ORGANIZATION 



US Army Corps of Engineers 



8b OFFICE SYMBOL 

 (If applicable) 



9 PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



8c. ADDRESS (Gty, State, and ZIP Code) 

 Washington, DC 20314-1000 



10 SOURCE OF FUNDING NUMBERS 



32325 



II TITLE (Include Security Classification) 



Stability of Dolos and Tribar Overlays for Rehabilitation of Stone-Armored Rubble-Mound 

 Breakwater and Jetty Trunks Subjected to Breaking Waves 



12. PERSONAL AUTHOR<S) 



Carver, Robert D.; Wright, Brenda J. 



13a. TYPE OF REPORT 



Final report 



13b TIME COVERED 

 FROM ' 



14. DATE OF REPORT {Year, Month, Day) 

 February 1988 



15 PAGE COUNT 

 35 



16 SUPPLEMENTARY NOTATION 



See reverse. 



COSATI CODES 



18 SUBJECT TERMS {Continue on reverse if necessary and identify by block number) 

 Armor units Jetties 



Breakwaters Rubble-mound 



19 ABSTRACT (Continue on reverse if necessary and identify by block number) 



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 (d/L) and relative 

 wave height (H/d) with minimum stability occurring at the lower values of d/L 

 and higher values of H/d , i.e., longer wave periods in shallower water. 



£. 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. 



(Continued) 



20 DISTRIBUTION /AVAILABILITY OF ABSTRACT 



El UNCLASSIFIED/UNLIMITED D SAME AS RPT 

 22a NAME OF RESPONSIBLE INDIVIDUAL 



n DTIC USERS 



21 ABSTRACT SECURITY CLASSIFICATION 



Unclassified 



22b TELEPHONE f/nc/ude Area Code) 22c OFFICE SYMBOL 



DO FORM 1473, 84 mar 



83 APR edition may be used until exhausted 

 All other editions are obsolete. 



SECURITY CLASSIFICATION OF THIS PAGE 



Unclassified 



