REPORT DOCUMENTATION PAGE BENG Gooones 
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1.AGENCY USE ONLY (Leave blank) 2.REPORT DATE 3.REPORT TYPE AND DATES COVERED 
November 1997 Final report 
4.TITLE AND SUBTITLE 5.FUNDING NUMBERS 
Periodic Inspection of Ofu Harbor Breakwater, American Samoa; 
Report 1, Base Conditions 
6.AUTHOR(S) 
Robert R. Bottin, Jr., Stanley J. Boc 
7.PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8.PERFORMING ORGANIZATION 
U.S. Army Engineer Waterways Experiment Station REPORT NUMBER 
3909 Halls Ferry Road, Vicksburg, MS 39180-6199 Technical Report CHL-97-32 
U.S. Army Engineer Division, Pacific Ocean 
Building 230, Fort Shafter, HI 96858-5440 | 
9.SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10.SPONSORING/MONITORING 
AGENCY REPORT NUMBER 
U.S. Army Corps of Engineers 
Washington, DC 20314-1000 
11.SUPPLEMENTARY NOTES 
Available from National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161. 
| 12a.DISTRIBUTION/AVAILABILITY STATEMENT 12b.DISTRIBUTION CODE 
Approved for public release; distribution is unlimited. 
13.ABSTRACT (Maximum 200 words) 
Selected navigation structures are periodically monitored under the periodic Inspections work unit of the Monitoring 
Completed Navigation Projects research program. Monitoring is done to gain an understanding of the long-term structural 
response of unique structures to their environment. Periodic data sets are used to improve knowledge in the design, 
construction, and maintenance of both existing and proposed projects. 
This report is the first in a series that will track the long-term structural response of the Ofu Harbor breakwater, American 
Samoa, to its environment. Data from limited ground-based surveys, aerial photography, and photogrammetric analysis were 
obtained to establish base level conditions for the Ofu Harbor breakwater. Although planned low-altitude photography was 
not obtained due to logistical problems, oblique images taken from a fixed-wing aircraft were analyzed using convergent 
photogrammetric techniques. A detailed walking survey of the structure resulted in a well-documented data set that can be 
compared to subsequent surveys. 
The Ofu Harbor breakwater site will be revisited to gather data to assess the long-term response of the structure to its 
environment. These data will facilitate engineering decisions concerning whether closer surveillance and/or repair of the 
(Continued) 
14.SUBJECT TERMS 15.NUMBER OF PAGES 
Aerial photography Periodical Inspections 46 
Breakwaters Photogrammetry 16.PRICE CODE 
Coastal navigation projects Remote sensing 
Ofu Harbor breakwater Tribars 
17.SECURITY CLASSIFICATION |18.SECURITY CLASSIFICATION |19.SECURITY CLASSIFICATION | 20.LIMITATION OF ABSTRACT 
OF REPORT OF THIS PAGE OF ABSTRACT 
UNCLASSIFIED UNCLASSIFIED Sill 
NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89) 
Prescribed by ANSI Std, 239-18 
298-102 
