UNCLASSIFIED 



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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



MR 76-9 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE fand SublKloJ 



WAVE ATTENUATION BY ARTIFICIAL SEAWEED 



5. TYPE OF REPORT A PERIOD COVERED 



Miscellaneous Report 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORC«; 



John Ahrens 



8. CONTRACT OR GRANT NUMBERf.) 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-SP) 



Kingman Building, Fort Belvoir. Virginia 22060 



F31236 



I 1. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building. Fort Belvoir. Virginia 7?(\f.(\ 



12. REPORT DATE 



June 1976 



13. NUMBER OF PAGES 

 1/ I ^ f 



14. MONITORING AGENCY NAME & ADDRESSC// dl»<irenl from Con(roI//ng Olticn) 



IS. SEduRITY CLASS, (ol Ihia ropori; 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT fo/ Oila Rspori; 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (ot Iha abstract sntsrad In Block 20, It ditlarmt Irom Report) 



IB. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continu 



cesaary and Identity by btock number) 



Artificial seaweed 

 Shore protection 



Wave attenuation 

 Waves 



20. ABSTRACT (Continue on reverae aide It neceanary and Identify by block number) 



A series of wave tank tests was conducted at the U.S. Army Coastal Engi- 

 neering Research Center (CERC) to determine the ability of a field of low" 

 specific gravity artificial seaweed to attenuate wave action. Wave gages 

 were located on both sides of the seaweed field to measure wave attenuation. 

 The field consisted of seven rows of seaweed with the rows spaced 3 meters 

 (10 feet) apart. Ten distinct wave conditions were tested using periods 

 ranging from 2.6 to 8.2 seconds and wave heights from 0.24 to 1.1 meters 



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