A Ten-Year History of Dolos Monitoring at Crescent City

Appleton, William S.; Kendall, Thomas R.; Melby, Jeffrey A.

doi:10.1061/9780784402429.363

Cited by 2 publications

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“…One main research area is monitoring at breakwater sites that have used Dolosse units. For example, Kendall and Melby (1992), Appleton et al (1996), and Myrick and Melby (2005) have all contributed towards a comprehensive monitoring study of Crescent City breakwater, California, USA. Another main research area is the combination of analytical approaches with laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of breakages of concrete armour units using a three-dimensional fracture model in the context of the combined finite-discrete element method

Guo

Latham

Xiang

2015

Computers & Structures

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Rubble-mound breakwaters covered by armour layers of concrete units are widely used coastal structures. In this work, a three-dimensional fracture model in the context of the combined finite-discrete element method is applied to investigate the structural integrity of two types of concrete armour units under dynamic and extreme loading conditions. Dolosse units are simulated in drop tests and pendulum tests, and Core-Loc units of prototype scale are simulated under an imaginary extreme loading condition. The whole structural response of concrete armour units is accurately captured and the results provide a better understanding of damage and reserve stability of such systems.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of breakages of concrete armour units using a three-dimensional fracture model in the context of the combined finite-discrete element method

Guo

Latham

Xiang

2015

Computers & Structures

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“…Baseline surveys were reported. Melby and Turk (1995), Markle et al (1995), Appleton et al (1996), Bottin and Tolliver (1999), and Melby (2002) discussed continued monitoring of the dolosse under the Periodic Inspections work unit as well as monitoring specifically for the San Francisco District. Monitoring has included wave climate, dolos movement and breakage, stress measurement within selected dolosse, and coring of dolosse for strength tests.…”

Section: History Of Crescent City Dolos Monitoringmentioning

confidence: 99%

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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A Ten-Year History of Dolos Monitoring at Crescent City

Cited by 2 publications

References 1 publication

Numerical simulation of breakages of concrete armour units using a three-dimensional fracture model in the context of the combined finite-discrete element method

Numerical simulation of breakages of concrete armour units using a three-dimensional fracture model in the context of the combined finite-discrete element method

Monitoring of Dolos Armor Units at Crescent City, California

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