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1. REPORT NUMBER 



TM-43 



2, GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBEP 



4. TITLE fund Su6t/(le; 



ENGINEERING AND ECOLOGICAL EVALUATION OF 

 ARTIFICIAL-ISLAND DESIGN, RINCON ISLAND, 

 PUNTA GORDA, CALIFORNIA 



5. TYPE OF REPORT a PERIOD COVERED 



Technical Memorandum 



6. PERFORMING ORG. REPORT NUMBER 



8. CONTRACT OR GRANT NUMBERf«) 



DACW72-73-C-0004 



7. AUTHORfu; 



James M. Keith 

 Roger E. Skjei 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



John A. Blume § Associates, Engineers 



130 Jessie Street 



San Francisco, California 94105 



08-1005 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



March 1974 



13. NUMBER OF PAGES 



76 



14. MONITORING AGENCY NAME & AOORESS(l I dlUerent troai Conttolling Olllce) 



IS. SECURITY CLASS, (ol thin report) 



Unclassified 



16. DISTRIBUTION STATEMENT (ol thU Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (ol the abstract entered In Block 20, II dlllereni Irom Report) 



18. SUPPLEMENTARY NOTES 



APPENDIX - "THE BIOTA OF RINCON ISLAND," prepared by William L. Brisby, 

 Professor of Marine Biology, Moorpark College, Moorpark, California. 



19. KEY WORDS CConlfnuo on reverse aide if r 



Rincon Island, California 

 Manmade island design 

 Revetment 

 Causeway 



ssary and identity by block number) 



Littoral transport 

 Bathymetry 

 Marine biology 

 Bottom sediment 



20. ABSTRACT (Continue on reverie aide It neceamary and Identity by block number) 



Rincon Island, Punta Gorda, California, is an offshore island manmade 

 in 1958. It was the first such island to be built with an ocean exposure. The 

 island, located in a depth of about 45 feet, is composed of armor rock and 

 tetrapod revetments enclosing a sand core. A pile-supported causeway about 

 2,700 feet long connects the island to the shore. 



Major findings of an evaluation of the island's performance in the more 

 than 14 years of its existence show: that the revetment has not' been damaged 



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