UNCLASSIFIED 
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REPORT DOCUMENTATION PAGE BEFORE COMPLETING FORM 
1. REPORT NUMBER 2. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER 
TP 81-1 
4. TITLE (and Subtitle) 5. TYPE OF REPORT & PERIOD COVERED 
Technical Paper 
6. PERFORMING ORG. REPORT NUMBER 
8. CONTRACT OR GRANT NUMBER(s) 
ESTIMATION OF WAVE REFLECTION AND ENERGY 
DISSIPATION COEFFICIENTS FOR BEACHES, 
REVETMENTS, AND BREAKWATERS 
7. AUTHOR(s) 
William N. Seelig 
John P. Ahrens 
10. PROGRAM ELEMENT, PROJECT, TASK 
AREA & WORK UNIT NUMBERS 
9. PERFORMING ORGANIZATION NAME AND ADDRESS 
Department of the Army 
Coastal Engineering Research Center (CERRE-CS) 
Kingman Building, Fort Belvoir, Virginia 22060 
F31538 
12. REPORT DATE 
13. NUMBER OF PAGES 
1S. SECURITY CLASS. (of thie report) 
UNCLASSIFIED 
11. CONTROLLING OFFICE NAME AND ADDRESS 
Department of the Army 
Coastal Engineering Research Center 
Kingman Building, Fort Belvoir, Virginia 22060 
14. MONITORING AGENCY NAME & ADDRESS(if different from Controlling Office) 
15a. DECLASSIFICATION/ DOWNGRADING 
SCHEDULE 
16. DISTRIBUTION STATEMENT (of this Report) 
Approved for public release; distribution unlimited. 
DISTRIBUTION STATEMENT (of the abstract entered in Block 20, if different from Report) 
- SUPPLEMENTARY NOTES 
- KEY WORDS (Continue on reverse side if necessary and identify by block number) 
Beaches Irregular waves Revetments 
Breakwaters Monochromatic waves Wave reflection 
Energy dissipation 
ABSTRACT (Continue en reverse side if neceseary and identify by block number) 
More than 4,000 laboratory measurements of wave reflection from beaches, 
revetments, and breakwaters are used to develop methods for predicting wave 
reflection and energy dissipation coefficients. Both monochromatic and 
irregular wave conditions are considered and the prediction techniques apply 
to both breaking and nonbreaking wave conditions. 
FORM 
DD . san 73 1473 EDrTion OF t Nov 65 1S OBSOLETE UNCLASSIFIED 
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