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REPORT DOCUMENTATION PAGE 



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1. REPORT NUMBER 



TP 80-8 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. T\TLE (Bnd Subtitle) 



CALCULATION OF WAVE ATTENUATION DUE TO 

 FRICTION AND SHOALING: AN EVALUATION 



5. TYPE OF REPORT & PERIOD COVERED 



Technical Paper 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfsJ 



William G. Grosskopf 



8. CONTRACT OR GRANT NUMBERfsJ 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CO) 



Kingman Building, Fort Belvoir, Virginia 22060 



10. PROGRAM ELEMENT. PROJECT, TASK 

 AREA & WORK UNIT NUMBERS 



A31592 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



October 1980 



13. NUMBER OF PAGES 

 15 



14. MONITORING AGENCY NAME a ADDRESSf// dllterenl from Controlling Otlice) 



IS. SECURITY CLASS, (of tlila report) 



UNCLASSIFIED 



15a. DECLASSIFI CATION/ DOWN GRADING 

 SCHEDULE 



16. DISTRIBUTION ST ATEMEN T Co/ (/i(s Reporf; 



Approved for public release, distribution unlimited. 



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



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Conlinue on reverse side if necessary and Identify by block number) 



Bottom friction Wave attenuation 

 Shoaling Wave height 



20. ABSTRACT (Continue on reverse aide If neceaaary and Identify by block number) 



An evaluation of the Bretschneider and Reid (1954) technique for cal- 

 culating wave attenuation due to friction and shoaling is presented. Data 

 used in this evaluation were collected at CERC's Field Research Facility 

 (FRF), Duck, North Carolina. The results, using Karaphuis' (1975) friction 

 factor diagram, show slightly underpredicted wave heights with an average 

 deviation of 6 percent. ^Poor correlation with observed wave heights is 

 illustrated when bottom contours are not straight and parallel, indicating the 

 presence of other mechanisms. 



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