Unclassified 

 SECURITY CLASSIFICATION OF THIS PAGE 



REPORT DOCUMENTATION PAGE 



form Approved 

 OMB No. 0704-0188 



1a. REPORT SECURITY CLASSIFICATION 

 Unclassified 



1b. RESTRICTIVE MARKINGS 



2a. SECURITY CLASSIFICATION AUTHORITY 



2b. DECLASSIFICATION /DOWNGRADING SCHEDULE 



3 DISTRIBUTION /AVAILABILITY OF REPORT 



Approved for public release; distribution 

 unlimited. 



4 PERFORMING ORGANIZATION REPORT NUMBER(S) 



Technical Report REMR-CO-12 



5 MONITORING ORGANIZATION REPORT NUMBER(S) 



6a. NAME OF PERFORMING ORGANIZATION 

 USAEWES, Coastal 

 Engineering Research Center 



6b. OFFICE SYMBOL 

 (If applicable) 



7a. NAME OF MONITORING ORGANIZATION 



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



PO Box 631 



Vicksburg, MS 39181-0631 



7b. ADDRESS (City, 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 (City. State, and ZIP Code) 

 Washington, DC 20314-1000 



10. SOURCE OF FUNDING NUMBERS 



32278 



1 1 . TITLE (Include Security Classification) 



Stability of Toe Berm Armor Stone and Toe Buttressing Stone on Rubble-Mound Breakwaters and 

 Jetties; Physical Model Investigation 



12 PERSONAL AUTHOR(S) 



Markle , Dennis G . 



13a TYPE OF REPORT 

 Final report 



13b. TIME COVERED 

 FROM 1 



14. DATE OF REPORT (Year. Month. Day) 

 September 1989 



15 PAGE COUNT 

 75 



16. supplementary notation A report of the Coastal Problem Area of the Repair, Evaluation, Main- 

 tenance, and Rehabilitation (REMR) Research Program. Available from National Technical 

 Information Service. 5285 Port Royal Road. Springfield. VA 22161. 



COSATI CODES 



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



Breakwaters Toe buttressing 



Jetties Toe stability 



Rubble mound Wave stability 



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



A series of two-dimensional (2-D) and three-dimensional (3-D) breakwater stability 

 experiments was developed and conducted to address the sizing of toe beirm and toe 

 buttressing stone in breaking wave environments. The 2-D tests focused on sizing of toe 

 stone on rubble-mound structure trunks exposed to 90-deg wave attack, i.e. wave orthogonals 

 perpendicular to structure crest. Toe berm armor stone sizing for oblique wave attack on 

 rubble-mound structure heads and trunks was examined in the 3-D model tests. Guidance for 

 sizing toe berm armor stone was developed for a range of wave and still-water level 

 conditions. Guidance for sizing of toe buttressing stone was addressed for a limited set of 

 incident wave conditions on structure trunks. 



20. DISTRIBUTION /AVAILABILITY OF ABSTRACT 



D2 UNCLASSIFIED/UNLIMITED □ SAME AS RPT. □ DTIC USERS 



21 ABSTRACT SECURITY CLASSIFICATION 



Unclassified 



22a. NAME OF RESPONSIBLE INDIVIDUAL 



22b TELEPHONE (Include Area Code) 22c OFFICE SYMBOL 



DD Form 1473. JUN 86 



Previous editions are obsolete 



SECURITY CLASSIFICATION OF THIS PAGE 



Unclassified 



