Accession Number : ADA296196

Title :   Periodic Inspections of Dolosse on Crescent City Breakwater, Crescent City, California. Report 1. Monitoring Data for Period 1989 - 1993.

Descriptive Note : Technical rept.,

Corporate Author : COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS

Personal Author(s) : Markle, Dennis G. ; Melby, Jeffrey A. ; Kendall, Thomas R.

PDF Url : ADA296196

Report Date : JUN 1995

Pagination or Media Count : 72

Abstract : The U.S. Army Corps of Engineers administers a research program known as the Monitoring of Completed Coastal Projects (MCCP) Program. A periodic monitoring program is carried out under the "Periodic Inspections" work unit of this program. The breakwater at Crescent City, CA, was rehabilitated in 1986 using 42-ton dolosse. During the rehabilitation, 20 dolosse were instrumented to measure loadings and armor unit motion. This instrumentation and subsequent monitoring were carried out as part of the Crescent City Prototype Dolosse Study (CCPDS). Near the end of the CCPDS it was noted that dolos movement was subsiding, but static loads were still showing increases. For this reason, a lower-level monitoring effort relative to CCPDS, was initiated and carried out during the period 1989-1993 to define the longer term trends in dolos movement, breakage and static stresses. Based on monitoring methods developed during the CCPDS and continued under the MCCP study reported herein, and based on data from both studies and their analysis, it is concluded that: Aerial photography and subsequent photogrammetric analysis can provide very accurate data on movement of armor units located above the waterline. The methods require only minimal ground truth to ensure accuracy of the data. (MM) (S

Descriptors :   *COASTAL REGIONS, *BREAKWATERS, *AERIAL PHOTOGRAPHY, OCEAN WAVES, STRESS ANALYSIS, MONITORING, MOTION, CONCRETE, STRUCTURAL RESPONSE, PHOTOGRAMMETRY, STORMS, CALIFORNIA, COASTAL ENGINEERING, SITE INVESTIGATIONS, DESIGN CRITERIA, REMOTE DETECTION, SLOPE STABILITY, OFFSHORE, BUOYS, HYDROSTATIC PRESSURE.

Subject Categories : Cartography and Aerial Photography
      Physical and Dynamic Oceanography
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE