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REPORT DOCUMENTATION PAGE BEFORE COMPLETING FORM 
T. REPORT NUMBER 2. GOVT ACCESSION NO. RECIPIENT'S CATALOG NUMBER 
MR 80-6 
4. TITLE (and Subtitle) - TYPE OF REPORT & PERIOD COVERED 
Rae ih Report 
A NUMERICAL MODEL FOR PREDICTING SHORELINE 
CHANGES 6. PERFORMING ORG. REPORT NUMBER 
Tetra Tech Report No. TC-831 
7. AUTHOR(s) 8. CONTRACT OR GRANT NUMBER(s) 
Bernard Le Mehaute and Mills Soldate DACW72-7T-C-0002 
9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT, PROJECT, TASK 
Tetra Tech Inc AREA & WORK UNIT NUMBERS 
’ ° 
630 North Rosemead Boulevard 
Pasadena, California 91107 
11. CONTROLLING OFFICE NAME AND ADDRESS 12. REPORT DATE | 
Coastal Engineering Research Center 13. NUMBER OF PAGES 
Kingman Building, Fort Belvoir, Virginia 22060 
14. MONITORING AGENCY NAME & ADDRESS(if different from Controlling Office) 15. SECURITY CLASS. (of this report) 
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F31551 
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) 
Currents Numerical model Shoreline evolution 
Great Lakes Shore structures Wave diffraction 
Holland Harbor, Michigan Shoreline changes Wave refraction 
20. ABSTRACT (Continue om reverse side if necessary and identify by block number) 
A mathematical model for long-term, three-dimensional shoreline evolution 
is developed. The combined effects of variations of sea level; wave refrac- 
tion and diffraction; loss of sand by density currents during storms, by rip 
currents, and by wind; bluff erosion and berm accretion; effects of manmade 
structures such as long groin or navigational structures; and beach nourish- 
ment are all taken into account. A computer program is developed with various 
subroutines which permit modification as the state-of-the-art progresses. The 
program is applied to a test _case at Holland Harbor, Michigan. 
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