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1. REPORT NUMBER 



CETA 80-8 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



ESTIMATION OF FLOW THROUGH OFFSHORE BREAKWATER 

 GAPS GENERATED BY WAVE OVERTOPPING 



5. TYPE OF REPORT & PERIOD COVERED 



Coastal Engineering 

 Technical Aid 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORS 



8. CONTRACT OR GRANT NUMBERfoJ 



William N. Seelig 

 Todd L. Walton, Jr. 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CS) 



Kingman Building, Fort Belvoir, Virginia 22060 



F31538 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



December 1980 



13. NUMBER OF PAGES 



21 



14. MONITORING AGENCY NAME a ADDRESSfi/ dtlferent from Controlling Oilice) 



15. SECURITY CLASS, (ol this report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (ol this Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (ol the abstract entered In Block 20, It different from Report) 



8. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue 



aide If necessary and Identify by block number) 



Breakwaters 

 Offshore breakwaters 



Wave height 

 Wave overtopping 



Wave period 

 Waves 



!0. ABSTRACT (Continue on reverse side If necessary and Identify by block number) 



This report presents a method for estimating the net flow through the gaps of 

 offshore segmented breakwaters caused by wave overtopping of the breakwaters. 

 The method was developed so that either monochromatic or irregular waves can be 

 specified. Example problems illustrate the effects of wave height and period, 

 breakwater freeboard, spacing between breakwaters, and shore attachment on the 

 flow rate. Computations may be done manually or by using the computer program, 

 BWFL0W2, available from the Corps of Engineers Computer Library, U.S. Army 

 Engineer Waterways Experiment Station, Vicksburg, Mississippi. 



DD ,E 



1473 



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