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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



I. REPORT NUMBER 



CETA 81-14 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



EFFECTS OF CURRENTS ON WAVES 



5. TYPE OF REPORT & PERIOD COVERED 



Coastal Engineering 

 Technical Aid 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs; 



Barry E. Herchenroder 



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 



B31673 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



October 1981 



13. NUMBER OF PAGES 

 20 



U. MONITORING AGENCY NAME a ADDRESSf;/ different from Controlling Olli 



15. SECURITY CLASS, (ol this report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (ol this Report) 



Approved for public release; distribution unlimited. 



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



18. SUPPLEMENTARY NOTES 



9. KEY WORDS (Co 



sary and identify by block i 



Horizontal currents 

 Surface gravity 



Wave characteristics 



Wave measurements 



0. ABSTRACT (Continue on reverse side it necessary and Identify by block number) 



This report presents ways in which a horizontal current influences surface 

 gravity waves and their measurement. Relatively simple hand-calculation meth- 

 ods are described which provide a means to estimate (a) the wavelength modifi- 

 cation due to a current, (b) whether a current can prevent waves from reaching 

 a particular location, (c) the correction needed to compensate for a current 

 when observed bottom pressure fluctuations are used to estimate wave heights, 

 and (d) the range of periods (if any) where the effects of currents can be 

 neglected when wave heights are estimated from bottom pressure fluctuations. 



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