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REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB Mo 0704-0188 

 Exp Date Iun30, 1986 



1a REPORT SECURITY CLASSIFICATION 



Unclassified 



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2a SECURITY CLASSIFICATION AUTHORITY 



2b DECLASSIFICATION /DOWNGRADING SCHEDULE 



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Approved for public release; distribution 

 unlimited. 



4. PERFORMING ORGANIZATION REPORT NUMBER(S) 



Technical Report CERC-88-5 



5 MONITORING ORGANIZATION REPORT NUMBER(S) 



6a NAME OF PERFORMING ORGANIZATION 



USAEWES Coastal 

 Engineering Research Center 



6b. OFFICE SYMBOL 

 (If applicable) 



WESCW 



7a. NAME OF MONITORING ORGANIZATION 



6c. ADDRESS (City, State, and ZIP Code) 



PO Box 631 



Vicksburg, MS 39180-0631 



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 ORGANIZATION 



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10. SOURCE OF FUNDING NUMBERS 



1 1 TITLE (Include Security Classification) 



Approximate Upper Limit of Irregular Wave Runup on Riprap 



12. PERSONAL AUTHOR(S) 



Ahrens, John P.; Heimbaugh, Martha S. 



13a. TYPE OF REPORT 



Final report 



13b TIME COVERED 

 FROM 



14 DATE OF REPORT (Year, Month. Day) 



May 1988 



15. PAGE COUNT 

 33 



16. SUPPLEMENTARY NOTATION 



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

 VA 22161. 



COSATI CODES 



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



18. SUBJECT TERMS (Continue on reverse if necessary and identify by block number) 



Irregular waves Riprap 

 Prediction method Runup 

 Revetments 



This report describes methods to calculate the approximate upper limit of runup on 

 riprap revetments caused by irregular wave action. A formula to predict the maximum runup 

 is developed from one laboratory study and compared to data from a second study. The 

 formula is found to fit the data of both studies quite well. A slightly improved version 

 of the formula is then developed by combining the data from both studies. The improved 

 formula has little or no systematic error associated with structure slope, water depth, or 

 wave conditions and is easy to use. Errors between predicted and observed elevations of 

 the maximum runup had a root mean square value of approximately 12 percent. 



20 DISTRIBUTION /AVAILABILITY OF ABSTRACT 



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21 ABSTRACT SECURITY CLASSIFICATION 



Unclassified 



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DD FORM 1473, 84 mar 



83 APR edition may be used until exhausted 

 All other editions are obsolete 



SECURITY CLASSIFICATION OF THIS PAGE 



Unclassified 



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