llNCT,A.SSTFTF.n 



SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) 



REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



MR 77-4 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



A LABORATORY STUDY OF THE STABILITY OF SAND- 

 FILLED NYLON BAG BREAKWATER STRUCTURES 



5. TYPE OF REPORT a PERIOD COVERED 



Miscellaneous Report 



.6;, PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs; 



Robert Ray 



B. CONTRACT OR GRANT NUMBERfo; 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CEREN-DE) 



Kingman Building, Fort Belvoir, Virginia 22060 



F31234 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



March 1977 



13. NUMBER OF PAGES 



J^l^ 



U. MONITORING AGENCY NAME a ADDRESSfi/ dllterent from Controlling Office) 



15. SECURITY CLASS, (of thie report) 



UNCLASSIFIED 



16. DISTRIBUTION ST ATEMEN T Co/ (hio Roporf; 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (of the absli 



ntered In Block 20, If different from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue 



sary and identify by block number) 



Breakwaters 

 Laboratory tests 

 Low-cost shore protection 



Sandbag breakwaters 

 Sandbag materials 

 Waves 



20. ABSTRACT (Continue on reverse elde If necesaary and identity by block number) 



One emergent and three submerged breakwaters built of sand-filled nylon 

 bags on a sand bed were subjected to progressively more severe wave conditions 

 in full-scale laboratory tests. The tests determined the properties of the 

 bags, the effects of wave action on placement of bags, and the performance of 

 bags and structures for various combinations of structure configuration and 

 wave conditions. The changes in the sand bed at the base of the structures 

 and the wave attenuation by the breakwaters were also investigated. 

 (Continued) 



DD ,^5 



1473 



EDtTlON OF t NOV 65 rS OBSOLETE 



UNCLASSIFIED 



SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) 



