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Periodic Inspections of Concrete-Armored Coastal Structures

By Robert R. Bottin

Abstract

information on the long-term structural performance of selected concrete-armored navigation structures to their environment. Inspections of coastal structures at Ofu Harbor, American Samoa; Nawiliwili, Laupahoehoe, and Kahului Harbors, HI; and Manasquan Inlet, NJ, are discussed herein. The response of stone-armored coastal structures to their environment was presented in ERDC/CHL CHETN-III-65. OVERVIEW: In the “Periodic Inspections ” work unit of the Monitoring Completed Navigation Projects (MCNP) Program, selected coastal navigation structures are periodically monitored to gain an understanding of their long-term structural response. Periodic data sets are evaluated to improve knowledge in design, construction, and maintenance of both existing and proposed coastal navigation projects, and will help avoid repeating past designs that have failed and/or resulted in high maintenance costs. Low-cost remote sensing tools and techniques, with limited ground truthing surveys, are the primary inspection tools used in the periodic monitoring efforts. Most periodic inspections consist of capturing above-water conditions of the structures at periodic intervals using high-resolution aerial photography. Structural changes (primary armor unit movement) are quantified through photogrammetric techniques. When a coastal structure is photographed at lo

Year: 2003
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