PREFACE 



This report is published to provide coastal engineers the results of a 

 series of prototype-scale tests of a floating breakwater that incorporates 

 massive cylindrical members (steel or concrete pipes, telephone poles, etc.) 

 in a matrix of scrap truck or automobile tires. The breakwater, which was 

 developed by the senior author while serving on the faculty of the State 

 University of New York at Buffalo (SUNY), is referred to as the Pipe-Tire 

 Breakwater (PT-Breakwater) . Tests were conducted in the large wave tank at 

 the U.S. Army Coastal Engineering Research Center (CERC) in a joint effort by 

 CERC and SUNY personnel. The work was carried out under CERC's Design of 

 Floating Breakwaters work unit, Coastal Structure Evaluation and Design 

 Program, Coastal Engineering Area of Civil Works Research and Development. 



The report was prepared by Dr. Volker W. Harms, SUNY and University of 

 California, Berkeley; Joannes J. Westerink, SUNY; Dr. Robert M. Sorensen, 

 Chief, Coastal Processes and Structures Branch, CERC; and James E. McTamany, 

 Coastal Oceanography Branch, CERC. 



The authors gratefuly acknowledge the assistance of SUNY technical spe- 

 cialist J. Sarvey and students T. Bender, P. Hughey, and P. Speranza, and 

 the difficult crane operations and frequent wave generator stroke changes 

 performed by CERC's research support personnel. 



This research was sponsored in part by the New York Sea Grant Institute 

 under a grant from the Office of Sea Grant, National Oceanic and Atmospheric 

 Administration (NOAA), U.S. Department of Commerce, through SUNY. It was also 

 supported by the U.S. Department of Energy under Contract W-7405-ENG-48 to the 

 Marine Sciences Group, Lawrence Berkeley Laboratory, University of California. 



Technical Director of CERC was Dr. Robert W. Whalin, P.E., upon publica- 

 tion of this report. 



Comments on this publication are invited. 



Approved for publication in accordance with Public Law 166, 79th Congress, 

 approved 31 July 1945, as supplemented by Public Law 172, 88th Congress, 

 approved 7 November 1963. 



ID E. BISHOP 

 Colonel, Corps of Engineers 

 Commander and Director 



