UNCLASSIFIED 



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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



SR-7 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



TIDES AND TIDAL DATUMS IN THE UNITED STATES 



S. TYPE OF REPORT & PERIOD COVERED 



Special Report 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs; 



D. L. HARRIS 



8. CONTRACT OR GRANT NUMBERfs; 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CO) 



Kingman Building, Fort Belvoir, Virginia 22060 



10. PROGRAM ELEMENT. PROJECT, TASK 

 AREA a WORK UNIT NUMBERS 



F3I234 



11. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



February 1981 



13. NUMBER OF PAGES 



382 



U. MONITORING AGENCY NAME & AODRESS(lt different from Controlling Office) 



15. SECURITY CLASS, (of thia report) 



UNCLASSIFIED 



15a. DECLASSIFICATION/ DOWNGRADING 

 SCHEDULE 



16. DISTRIBUTION STATEMENT fof thie Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (of the abstract entered In Block 20, If different from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on revorae aide If neceeaary and Identity by block number) 



Tidal datums Tides United States 



20^ ABSTT^ACT (Caatlaum cm rmvermm sfdi ff n«c«««a£7 aod Identify by block number) 



The boundary between sea and land appears to be the natural datum of reference for measuring 

 elevation of land or depth of the sea. TMs boundary, however, varies continuously because of the 

 astronomical tides and for other reasons. The various factors wliicli cause this variability are discussed 

 with emphasis on the astronomical tides as the most predictable of the phenomena which affect sea 

 level. (Continued) 



W) t jam'tB 1^73 EDITION OF » MOV 65 IS OBSOLETE 



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