Reprint or republication of any of tliis material shall give appropriate 

 credit to the U.S. Army Coastal Engineering Research Center. 



Limited free distribution within the United States of single copies of 

 this publication has been made by this Center. Additional copies are 

 available from: 



Superintendent o£ Documents 

 U.S. Government Printing Office 

 Washington, D.C, 20402 



STOCK NO. 008-022-00124-7 



Contents of this report are not to be used for advertising, 

 publication, or promotional purposes. Citation of trade names does not 

 constitute an official endorsement or approval of the use of such 

 commercial products. 



The findings in this report are not to be construed as an official 

 Department of the Army position unless so designated by other 

 authorized documents. 



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