Analysis of 42-Ton Dolos Motions at Crescent City

Kendall, Thomas R.

doi:10.1061/9780872626874.159

Cited by 3 publications

(7 citation statements)

References 1 publication

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“…Figure 6 shows the dolos section and cap looking south in 2004. More historical details may be found in USAE District, San Francisco (1992), Bottin (1988), Kendall (1988), Kendall andMelby (1989 and, and Markle and Greer (1992). …”

Section: Project Location and Brief Historymentioning

confidence: 99%

“…Baumgartner et al (1985), Howell (1985 and Chapter 1 Introduction 1986), and Kendall et al (1985) reported on the design of the early monitoring effort. The focus at the time was dolos structural monitoring, but Kendall (1988) also discussed photogrammetric monitoring of the dolos movements. Kendall (1988), Howell (1988, 1990), Howell and Melby (1991), Kendall andMelby (1989, 1992), Markle and Greer (1992), and USAE District, San Francisco (1992) reported results from this early monitoring study.…”

Section: History Of Crescent City Dolos Monitoringmentioning

confidence: 99%

“…The focus at the time was dolos structural monitoring, but Kendall (1988) also discussed photogrammetric monitoring of the dolos movements. Kendall (1988), Howell (1988, 1990), Howell and Melby (1991), Kendall andMelby (1989, 1992), Markle and Greer (1992), and USAE District, San Francisco (1992) reported results from this early monitoring study. These reports discuss the nesting of the armor layer and stabilization as well as the unique dolos structural response measurements.…”

Section: History Of Crescent City Dolos Monitoringmentioning

confidence: 99%

“…These reports discuss the nesting of the armor layer and stabilization as well as the unique dolos structural response measurements. Kendall (1988) reported on design of the unique photogrammetric measurement system using ground-truthed, lowaltitude helicopter, photogrammetric survey techniques as well as the photogrammetric measurements of dolos movements. Baseline surveys were reported.…”

Section: History Of Crescent City Dolos Monitoringmentioning

confidence: 99%

“…The targeted survey points serve as reference points for overlapping photography. To establish accuracy, comparisons of coordinates for selected ground survey targets with stereo model photographs are conducted (Kendall 1988). Dolosse are marked with three visible targets at spatially separate points.…”

Section: Photogrammetric Analysismentioning

confidence: 99%

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Monitoring of Dolos Armor Units at Crescent City, California

Myrick¹,

Melby²

2005

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Crescent City breakwater is located on the California coastline approximately 17 miles south of the Oregon border. In 1974 and again in 1986, dolosse were placed along a section of the breakwater particularly susceptible to damage. Monitoring of above water dolosse moment and breakage has been conducted since 1986. In August of 2004, a detailed monitoring survey was conducted of the dolos section of the Crescent City breakwater. The goal of this monitoring is to understand the long-term structural response of the dolosse. Detailed monitoring included ground surveys, aerial photography, photogrammetric analysis, and a broken armor unit survey. Results showed very little dolos movement has occurred since the end of the initial nesting period in 1988. Furthermore, no additional dolos breakage was observed since 1993. From 1995 to 1999, core samples were obtained from dolosse cast in 1986 and in 1974 in order to determine the in-situ strength of units in both non-loaded (near concrete cap) and highly loaded regions (near still water level) of the structure. The cores were subjected to standard laboratory concrete strength tests. Results indicated that the structural strength has increased considerably since construction for non-loaded units. However, concrete strength for units placed in highly loaded units near the still water level was near constant.

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Section: Project Location and Brief Historymentioning

confidence: 99%

Section: History Of Crescent City Dolos Monitoringmentioning

confidence: 99%

Section: History Of Crescent City Dolos Monitoringmentioning

confidence: 99%

Section: History Of Crescent City Dolos Monitoringmentioning

confidence: 99%

Section: Photogrammetric Analysismentioning

confidence: 99%

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Monitoring of Dolos Armor Units at Crescent City, California

Myrick¹,

Melby²

2005

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Movement and Static Stress in Dolosse: Six Years of Field Monitoring at Crescent City

Kendall

Melby

1993

Coastal Engineering 1992

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Measurements of Forces on Dolos Armor Units at Prototype Scale

Howell

1988

Int. Conf. Coastal. Eng.

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In-situ measurements of the structural bending moments and torque about the shank-fluke interface of the dolos armor unit have been made for 42-ton (36-metric tonne) dolosse at Crescent City, California jetty. The measurements include the static loads on the dolosse as well as wave induced forces. The data were obtained from internal strain gages cast into the dolos during construction along with a special data acquisition system. The measurement system was also capable of capturing impact forces caused by dolos rocking or movement. Measurements were made during the winter storm seasons from January 1987 through May 1988. Coincident with the structural measurements, wave height and period were measured at several water depths approaching the breakwater, including a site directly in front of the dolos test section. The Crescent City jetty is a shallow water breakwater with depth limited waves in about 10 meters of water depth. The structural measurements were made from 14 dolos units arranged in a rectangular section on the top layer of the trunk portion of the jetty. Four of these dolosse are also instrumented with an accelerometer platform to measure motion with six degrees of freedom. In addition, there are three instrumented dolosse on the bottom layer of the breakwater. These dolosse measure the static stress due to the units placed on top of them, as well as pulsating forces. The structural and wave measurements, reported here, are supplemented with hydrostatic pore pressure measurements in the core material of the breakwater, and by aerial photogrammetric motion analysis (Kendall, 1988), land based surveys, boudary condition surveys, hydrographic surveys, and side scan sonar surveys.

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Analysis of 42-Ton Dolos Motions at Crescent City

Cited by 3 publications

References 1 publication

Monitoring of Dolos Armor Units at Crescent City, California

Monitoring of Dolos Armor Units at Crescent City, California

Movement and Static Stress in Dolosse: Six Years of Field Monitoring at Crescent City

Measurements of Forces on Dolos Armor Units at Prototype Scale

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