Degradation model for rock armour in coastal engineering

Latham, John-Paul

doi:10.1016/0148-9062(91)91241-i

Cited by 8 publications

(26 citation statements)

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“…In fact, since the MCWI index is calculated based on the mathematical product of a number of parameters, and one of these is the number of days when the temperature falls below freezing (which does not occur in Bahrain) the MCWI calculated in this way must be zero and the climate is treated as benign. It was noted in Latham's paper (Latham 1991) that salt crystallization in porous sedimentary rocks can be accelerated by the climate in the Middle East, and this concurs with observations of armourstone inservice in Bahrain. Therefore, the original recommendations from Latham were used to determine X 6 instead of the MCWI index of Lienhart.…”

Section: Meteorological Climate Weathering Intensitysupporting

confidence: 68%

“…For the purposes of this study X 6 has been determined by the method described by Latham (1991). However, there is no local data to support this and the refinement of the X 6 parameter could be the subject of further study.…”

Section: Discussionmentioning

confidence: 99%

“…These two degradation models are greatly based on works carried out by Latham (1991) and Leinhart (1998 and2003), which were later redeveloped (Latham, Lienhart, Dupray, 2006).…”

Section: Overview Of Degredation Modelsmentioning

confidence: 99%

“…The first work was proposed by Latham (1991), who presented a method for predicting armourstone mass loss in-service. Lienhart (1998) presented a method of evaluating the quality of armourstone sources.…”

Section: Introductionmentioning

confidence: 99%

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Weathering of Rock as Armourstone: A Case Study on Bahrain Limestone

Caricato¹,

Woods²,

Mohan³

2011

Int. Conf. Coastal. Eng.

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Locally-sourced armourstone is used extensively in the construction of new sea defence structures throughout Bahrain, with hundreds of thousands of tonnes being placed on single reclamation projects. This armourstone is won almost exclusively from the local quarry, which outputs limestone of variable quality. An evaluation has been made into the quality of local rock for usage as armourstone, using observations on sites and at the quarry, as well as compliance test results from various projects undertaken in recent years. Attempts are made to quantify potential losses in-service, by using the two degradation models described in the CIRIA Rock Manual, which give markedly different estimates. The envisaged loss of mass is difficult to predict with great accuracy due to the high sensitivity of the models to material and site parameters. Plots of estimated mass loss over time are presented for different rock sizes and different levels of rock armour mobility.

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Section: Meteorological Climate Weathering Intensitysupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

“…These two degradation models are greatly based on works carried out by Latham (1991) and Leinhart (1998 and2003), which were later redeveloped (Latham, Lienhart, Dupray, 2006).…”

Section: Overview Of Degredation Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Weathering of Rock as Armourstone: A Case Study on Bahrain Limestone

Caricato¹,

Woods²,

Mohan³

2011

Int. Conf. Coastal. Eng.

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“…As an example input parameters for two site situations are given in table 2 (Latham [1]): (i) for a 3 ton, basalt in tropical climate, medium grading, dynamic design, and (ii) for 4.5 ton, temperate climate, narrow grading, static design. Abrasion mill test results for a specific type of armor stone.…”

Section: Example Of Degradation Modelmentioning

confidence: 99%

Environmental impacts on coastal structures with a case evaluation of armor stone protection at Keweenaw Waterway, USA

Zakikhani

Harrelson

Tom³

et al. 2010

WIT Transactions on Engineering Sciences

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The evaluation of armor stone performance as a viable construction material is essential to increasing the longevity of maritime structures used to protect harbors, coastal areas and navigable waterways from damaging waves and other forces. The environmental parameters have led to the armor stones deteriorating faster than laboratory testing indicates. This paper provides an overview of the decomposition of the four rock types (limestone, granite, quartzite, and concrete) over the five field inspections. The meteorological variables were used to calculate the number of freeze-thaw events that occurred over the time period. The water wave height data were used to calculate stone deterioration from wave actions. The results from the field observations, together with the meteorological analysis, were used to help better parameterize the numerical model and assist in identifying problems in scalability from laboratory test samples to field samples.

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Coastal Geo-Engineering Techniques for the Assessment of Rock Armour Structures

Pires

Chaminé

Piqueiro

et al. 2014

Marine Georesources & Geotechnology

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This work deals with the problem of assessing armourstone structures focusing on strengthening the combination of geo-marine techniques and geotechnical properties. The research has two main purposes: (i) to establish an integrative coastal geo-engineering approach for better assessment of the hydraulic structures; and (ii) to draw attention to the importance of quarry evaluation in order to improve armourstone quality and durability. Several studies have demonstrated the relevance of a holistic approach to coastal design issues. The suggested approach couples GIS-based mapping with geo-engineering techniques assessment along five pilot sectors of the Espinho coastal system in Northwestern Portugal. This investigation allowed us to propose zoning a coastal structure according to its degree of deterioration, geomechanical properties and geomaterial status. Replacement of the primary armour layer in only selected sections or components of the structure will reduce the cost of maintenance, repair and reinforcement work. All the gathered data about the preservation status of the armour layer and the quarry inventory have been compiled in a powerful GIS geo-database. The paper argues for the wider use of combination of coastal geo-engineering and GIS analysis in planning the monitoring and=or maintenance of marine works using armourstone.

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Degradation model for rock armour in coastal engineering

Cited by 8 publications

References 0 publications

Weathering of Rock as Armourstone: A Case Study on Bahrain Limestone

Weathering of Rock as Armourstone: A Case Study on Bahrain Limestone

Environmental impacts on coastal structures with a case evaluation of armor stone protection at Keweenaw Waterway, USA

Coastal Geo-Engineering Techniques for the Assessment of Rock Armour Structures

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