Jf NC LA SSIFI ED 



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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



MR 77-7 (IV) 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. T\T\.E (and Subtitle) 



LABORATORY EFFECTS IN BEACH STUDIES 

 Volume IV. MOVABLE-BED EXPERIMENTS WITH 

 II^/L = 0.021 (1972] 



5. TYPE OF REPORT a PERIOD COVERED 



Miscellaneous Report 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs; 



Charles B. Chesnutt 

 Robert P. Stafford 



a. CONTRACT OR GRANT NUMBERfs; 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CP) 



Kingman Building, Fort Belvoir, Virginia 22060 



D31192 



n. CONTROLLING OFFICE NAME AND ADDRESS 



Department of tlie Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



December 77 



13. NUMBER OF PAGES 



U. MONITORING AGENCY NAME a ADORE.SS(ll dllferent Irom Controlling Olllce) 



15. SECURITY CLASS, (ol thla report) 



LTJCLASSIFIED 



16. DISTRIBUTION ST ATEMENT fo/ this Reporf; 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (of the abat 



ntered In Block 20, 11 dtflerent from Report) 



18. SUPPLEMENTARY NOTES 



>. KEY WORDS (Continue on reve 



Breakers 



Coastal engineering. 



Currents 



Model studies 



aide It neceaaary and Identity by block number. 



Movable-bed e.xperiments 

 Wave envelopes 

 Wave generators 



Wave height variability 

 Wave reflection 

 Wave tanks 



20. ABSTRACT CCaatinum aa rmv^rmm aA£t tf nmce^aary and Identity by block number) 



A two-dimensional movable-bed experiment was conducted in a 6-foot-wide wave 

 tank for 180 hours, with a wave period of 1.90 seconds and a generated wave 

 height of 0.36 foot. The profile had an initial slope of 0.05, which was flatter 

 than the profiles in earlier experiments (0.10 in Vols. II and III of the series), 

 and developed a different profile shape. The profile never reached equilibrium, 

 even though the shoreline stopped retreating and the water temperature was 

 relatively constant for the last 80 hours. 



(continued) I 



Ulf I J, 



M73 



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