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REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No 07040188 

 f«p Dare lun 30 1986 



la REPORT SECURITY CLASSIFICATION 



Unclassified 



lb RESTRICTIVE MARKINGS 



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2b DECLASSIFICATION /DOWNGRADING SCHEDULE 



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Approved for public release; distribution 

 unlimited 



a PERFORMING ORGANIZATION REPORT NUMBER(S) 



Technical Report CERC-86-12 



5 MONITORING ORGANIZATION REPORT NUMBER(S) 



6a. NAME OF PERFORMING ORGANIZATION 



USAEWES, Coastal 

 Engineering Research Center 



6b OFFICE SYMBOL 

 (// applicable) 



7a NAME OF MONITORING ORGANIZATION 



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



PO Box 631 



Vicksburg, MS 39180-0631 



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 ORGANIZATION 



US Army Corps of Engineers 



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 (If applicable) 



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Washington, DC 20314-1000 



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WORK UNIT 

 ACCESSION NO 



1 1 TITLE (Include Security Classification) 



Review and Comparison of Methods for Estimating Irregular Wave Overtopping Rates 



12 PERSONAL AUTHOR(S) 



Douglass, Scott L. 



13a TYPE OF REPORT 



Final report 



13b TIME COVERED 

 FROM 



14 DATE OF REPORT [Year Month, Day) 



December 1986 



15 PAGE COUNT 



44 



16 SUPPLEMENTARY NOTATION 



Available from National Technical Information Services, 

 Snringfield VA 22161. 



5285 Port Royal Road, 



COSATi CODES 



SUB-GROUP 



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



Coastal flooding Overtopping Wave runup 



Coastal structures Seawalls 



Irregular waves Wave overtopping 



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



Methods for estimating the volume rate of wave overtopping by irregular seas are 

 reviewed. Four methods are discussed in detail: Shore Protection Manual (SPM 1984), Goda 

 (1971), Battjes (1974), and Owen (1980). Each method is discussed adequately for 

 engineering use, and an example using each method is given. The assumptions made in each 

 method's derivation and the importance of these assumptions are discussed also. Since the 

 four methods were derived for different situations, the methods' ranges of applicability are 

 summarized. 



The different methods yield results which can vary by more than an order-of- 

 magnitude. For vertical seawalls, the SPM method estimates more overtopping than Goda's 

 method except in very shallow water. For steeply sloped structures, the SPM method 

 estimates less overtopping than Owen's method. For mildly sloped structures, the SPM method 

 estimates less overtopping than Battjes' method except for very low relative freeboards 



(Continued) 



20 distribution /availability of abstract 

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Unclassified 



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rn DO FORM 1473, 84MAR 



83 APR edition may be used until exhausted 

 All other editions are obsol ;te 



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