PREFACE 



This report is published to show the relation between two versions 

 of the energy flux method of predicting longshore transport: The volume 

 rate prediction recommended in the Shore Protection Manual (SPM) (U.S. 

 Army, Corps of Engineers, Coastal Engineering Research Center, 1977), and 

 the immersed weight rate prediction proposed in other publications. The 

 need for this explanation was indicated by inquiries from field engineers 

 to the staff at CERC. 



The report was prepared by Dr. Cyril Galvin, formerly Chief, Coastal 

 Processes Branch, CERC, under the general supervision of Mr. R.P. Savage, 

 Chief, Research Division. 



Comments on this publication are invited. 



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

 Congress, approved 21 July 1945, as supplemented by Public Law 172, 88th 

 Congress, approved 7 November 1963. 



TED E. BISHOP 



Colonel, Corps of bngineers 



Commander and Director 



