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READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



I. REPORT NUMBER 



MR 76-8 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



DIURNAL VARIATIONS IN VISUALLY OBSERVED BREAKING 

 WAVES 



5. TYPE OF REPORT & PERIOD COVERED 



Miscellaneous Report 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs; 



P.C. Pritchett 



8. CONTRACT OR GRANT NUMBERfu) 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CP) 



Kingman Building, Fort Belvoir, VA 22060 



A 31463 



I 1. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, VA 22060 



12. REPORT DATE 



May 1976 



13. NUMBER OF PAGES . 



24^^r 



U. MONITORING AGENCY NAME a ADDRESSfy/ dj//eren( from Controlling Ollice) 



IS. SECURITY CLASS, (ol this report) 



UNCLASSIFIED 



16. DISTRIBUTION ST ATEMENT fo/ (hfs RoporfJ 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (ol the abs 



ntered in Block 20, II diflerent from Report) 



IB. SUPPLEMENTARY NOTES 



I. KEY WORDS (Continue on rev 



Breaker height 

 Diurnal variations 



tide it necessary and Identify by block number) 



Sea breeze-generated waves 

 Wave climate 



20. ABSTRACT (Continue on reverse side It necessary and Identify by block number) 



In over 53,000 visual observations made four times daily at 17 U.S. Coast 

 Guard stations during June, July, and August, the average monthly diurnal 

 variations in breaker height ranged from 0.05 to 0.36 foot; diurnal variations 

 averaged about 10 percent of the monthly mean height. Stations along the 

 gulf and in the Pacific Northwest showed the most diurnal variations. Stations 

 with good exposure had smaller absolute diurnal variations in height tlian 

 stations with limited exposure. Absolute diurnal variations were also small at 



DD ,^5 



1473 



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