UNCLASSIFIED 



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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



TP 76-11 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Sublllle) 



GRAIN SHAPE AND SIZE DISTRIBUTION EFFECTS IN 

 COASTAL MODELS 



5. TYPE OF REPORT & PERIOD COVERED 



Technical Paper 



6. PERFORMING ORG. REPORT NUMBER 



'. AUTHORfsJ 



J. Ian Collins 

 Charles B. Chesnutt 



8. CONTRACT OR GRANT NUMBERfa) 



DACW72-72-C-0024 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Tetra Tech, Incorporated 

 630 N. Rosemead Boulevard 

 Pasadena, California 91107 



D31192 



It. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CP) 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



July 1976 



13. NUMBER OF PAGES 



254 



U. MONITORING AGENCY NAME 4 ADDRESSfi/ dltlerent Irom Controlling Oflice) 



15. SECURITY CLASS, (ol Ihia report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (ol this Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (ol tha abstract . 



ed In Block 20, It dlllerent Irom Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on reverse side it necessary and Identity by block number) 



Coastal models Sediment 



Grain shape Size distribution 



Profiles Longshore bars 



20. ABSTRACT (Continue an reverse aide It necessary and Identify by block number) 



Noda (1971, 1972) proposed a two-dimensional, coastal movable-bed, scale- 

 model relationship with four basic scale ratios: (a) horizontal scale, 

 (b) vertical scale, (c) sediment-size Tatio, and (d) relative specific weight 

 ratio. The model law was derived by empirically matching the distance from 

 the Stillwater level (SWL) intercept to the toe of the foreshore. 



This study was conducted to investigate the effects of the model sediment- 

 size distribution and particle shape in movable-bed models and, if possible 



EDITION OF t MOV 65 IS OBSOLETE 



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