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 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



TP 80-4 



2. GOVT ACCESSION NO, 



3. RECIPIENT'S CATALOG NUMBER 



A. TITLE fand Sub(yrle) 



THE SPM ENERGY FLUX METHOD FOR PREDICTING 

 LONGSHORE TRANSPORT RATE 



5. TYPE OF REPORT & PERIOD COVERED 



Technical Paper 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs; 



8. CONTRACT OR GRANT NUMBERCsJ 



Cyril Galvin 

 Charles R. Schweppe 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army- 

 Coastal Engineering Research Center (CERRE-CP) 

 Kingman Building, Fort Belvoir, Virginia 22060 



D31196 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



June 1980 



'3. NUMBER OF PAGES 



34 



14. MONITORING AGENCY NAME & ADDRESSfif dy«Bi-en( from Controlling Ollice) 



IS. SECURITY CLASS, (ol this report) 



UNCLASSIFIED 



16. DISTRIBUTION ST ATEMENT fo/ t/l/s ReporO 



Approved for public release; distribution unlimited. 



'7. DISTRIBUTION STATEMENT (of the abstract entered in Block 20, if different from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue < 



saary and Identify by block number) 



Coastal engineering 

 Energy flux 



Longshore transport rate 

 Wave height 



2Q. ABSTRACT (XTantimja am rmv^ram sxiA ff nmcv^vary mtd Identity by block number) 



This report explains in detail the energy flux method in Section 4.532 of 

 the Shore Protection Manual (SPM) . Appendix A describes the derivation of four 

 energy flux factors. Appendix B explains how the significant wave height enters 

 these equations. Appendix C identifies the data that led to the prediction of 

 longshore transport rate from the energy flux factor. The importance of the 

 correct formulation of breaker speed, and its effect on estimates of breaker 

 angle are demonstrated. The report describes the steps used to arrive at the 

 energy flux method, but it does not critically analyze those steps. 



on •"' 



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