Woods Hole Oceanographic institution 



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 Unclassified 



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 OMB No. 0704-0188 



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2a. SECURITY CLASSIFICATION AUTHORITY 



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3 DISTRIBUTION /AVAILABILITY OF REPORT 



Approved for public release; distribution 

 unlimited. 



4. PERFORMING ORGANIZATION REPORT NUMBER(S) 

 Technical Report CERC-90-8 



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 (Oty, State, and ZIP Code) 



3909 Halls Ferry Road 

 Vicksburg, MS 39180-6199 



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



8a. NAME OF FUNDING /SPONSORING 

 ORGANIZATION 



US Army Corps of Engineers 



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 (If applicable) 



9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 



8c ADDRESS rCify, State, and ZIP Code) 



Washington, DC 20314-1000 



10 SOURCE OF FUNDING NUMBERS 



PROGRAM PROJECT TASK 



ELEMENT NO. NO. NO. 



1 1 . TITLE (Include Security Classification) 



Midscale Physical Model Validation for Scour at Coastal Structures 



12. PERSONAL AUTHOR(S) 



Hughes, Steven A. 



Fowler, Jimmy E. 



13a. TYPE OF REPORT 



Final report 



13b. TIME COVERED 14. DATE OF REPORT (Year, H^onttf, Day) 15. PAGE COUNT 



FROMAug 88 ToDec 89 June 1990 298 



16. SUPPLEMENTARY NOTATION 



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) 



Beach profiles Erosion Scaling 



Coastal processes Movable-bed models Scour 

 Coastal structures Physical models Storm erosion 



!lO 





= o 



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



A l-to-7.5 scale (midscale) movable-bed physical model was used to validate model 

 scaling criteria selected as most appropriate for turbulence-dominated erosion of 

 sediment by waves. Two-dimensional flume tests successfully reproduced profile evolution 

 observed in prototype-scale wave flume tests conducted under both regular and irregular 

 wave conditions. For the case of regular waves, a sloping concrete revetment was exposed, 

 thus validating the scaling guidance for use in studying scour at coastal structures. 

 Variations in experimental parameters were systemmatically examined. Comparisons between 

 regular wave and irregular wave profile evolution indicated that best correspondence is 

 achieved if the significant wave height equals the monochromatic wave height, although 

 irregular wave profile evolution takes about twice as long. The impacts of a vertical 

 seawall on profile change are briefly examined. 



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ODForm1473. JUN 86 



Previous editions are obsolete. 



SECURITY CLASSIFICATION OF THIS PAGE 

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