REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No. 0704-0188 



Public reporting burden forthis collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining 

 the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions 

 for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA22202-4302, and to the 

 Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC20503. 



1. AGENCY USE ONLY (Leave blank) 



2.REPORT DATE 



July 1998 



3.REPORT TYPE AND DATES COVERED 



Final report 



4.TITLE AND SUBTITLE 



Three-Dimensional Breakwater Stability Tests at Vale de Cavaleiros, 

 Cape Verde 



5.FUNDING NUMBERS 



6.AUTHOR(S) 



Ernest R. Smith, Jeffrey A. Melby 



7.PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 



U.S. Army Engineer Waterways Experiment Station 

 3909 Halls Ferry Road, Vicksburg, MS 39180-6199 



8.PERFORMING ORGANIZATION 

 REPORT NUMBER 



Technical Report CHL-98-22 



9.SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 



1 0.SPONSORING/MONITORING 

 AGENCY REPORT NUMBER 



11. SUPPLEMENTARY NOTES 



Available from National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161. 



12a.DISTRIBUTION/AVAILABILITY STATEMENT 



Approved for public release; distribution is unlimited. 



12b.DISTRIBUTION CODE 



13.ABSTRACT (Maximum 200 words) 



A breakwater rehabilitation has been proposed for Vale de Cavaleiros, Republic of Cape Verde. Rehabilitation would 

 include extending the breakwater length, placing all salvageable tetrapods in the northernmost portions of the breakwater, and 

 placing Core-Loc armor units on the remainder of the structure. A breakwater stability model investigation was initiated by 

 the U.S. Army Engineer Waterways Experiment Station's Coastal Engineering Research Center. The goal of the study was to 

 evaluate the stability of the Core-Loc armor layer for the proposed breakwater rehabilitation. This report describes the 

 rehabilitation design and facilities used, as well as the three-dimensional stability test results. 



14.SUBJECT TERMS 



Breakwater rehabilitation Tetrapods 



Breakwater stability Vale de Cavaleiros breakwater 



Core-Loc armor units 



15.NUMBER OF PAGES 



79 



16.PRICECODE 



17.SECURITY CLASSIFICATION 

 OF REPORT 



UNCLASSIFIED 



18.SECURITY CLASSIFICATION 

 OF THIS PAGE 



UNCLASSIFIED 



INSECURITY CLASSIFICATION 

 OF ABSTRACT 



20.LIMITATION OF ABSTRACT 



NSN 7540-01-280-5500 



Standard Form 298 (Rev. 2-89) 



Prescribed by ANSI Std. Z39-18 

 298-102 



