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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



MR 77-1 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE fand SuhiyileJ 



A POSITIVE DISPLACEMENT OSCILLATORY WATER TUNNEL 



5. TYPE OF REPORT a PERIOD COVERED 



Miscellaneous Report 



f> "PERFORMIN 



G ORG. REPORT NUMBER 



7. AUTHORfsJ 



Karl E.B. Lofquist 



8. CONTRACT OR GRANT NUMBERfs) 



CERC Agreement No. 76-50 



PERFORMING ORGANIZATION NAME AND ADDRESS 



National Bureau of Standards 

 Mechanics Division 

 Washington, D.C. 20234 



D3119S 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CP") 



Kingman Building, Fort Bel voir, VA 22060 



12. REPORT DATE 



February 1977 



13. NUMBER OF PAGES 



14. MONITORING AGENCY NAME & />.ODHESS(l I dlfterent Irom Controlling Ollice) 



15. SECURITY CLASS, (of Ibis report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (of this Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (o{ the absira 



ed in Blocli 20, il dllferent from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Co 



sary and identify by bloclc number) 



Coastal processes 

 Permeability effects 

 Prototype tests 



Sand transport 

 Water tunnel 

 Waves 



20. ABSTRACT ("Continue on reverse side H necessary and identity by block numberj 



The water tunnel described produces sinusoidal flow with peak velocities 

 adjustable from to at least 30 centimeters per second for any period between 

 3 and 25 seconds. The tunnel is of U-tube design with the middle horizontal 

 part comprising the test section. The vertical end parts are two cylinders 

 with tight-fitting pistons at one end, and two reservoirs open to air at the 

 other. The pistons are driven by a variable-speed electric motor, with an 

 adjustable counterweight permitting operation at resonance at any period. 



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