Peat slope failures and other mass movements in western Ireland, August 2008

Dykes, Alan P.; Jennings, Paul

doi:10.1144/1470-9236/09-020

Cited by 17 publications

(16 citation statements)

References 20 publications

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“…The dominant morphology is that of a bogflow. However, a basal shear surface around 20 mm above the base of the peat was visible in two small parts of the source area (Dykes 2009;Dykes and Jennings 2011). Although the latter observation corresponds with a 'bogslide' (Dykes and Warburton 2007b), we will refer to this failure as a bogflow.…”

Section: Study Sitesmentioning

confidence: 95%

“…Most involve shearing of mineral soil beneath the peat ('peaty-debris slides'), shearing at the peat-mineral interface ('peat slides'), or shearing entirely within the basal peat ('bog slides'). 'Peat flows', a term reserved for failures resulting primarily from head-loading, appear to be effectively bearing capacity failures with small areas of shear surface within the basal peat having been observed in the Derrybrien and Ballincollig Hill landslides (Long 2005; Dykes and Jennings 2011).…”

Section: Blanket Bog Failures In Irelandmentioning

confidence: 99%

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Botanical and geotechnical characteristics of blanket peat at three Irish bogflows

Madio

Dykes

2022

Environmental Geotechnics

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Systematic investigations of instability and failure of peat covered hillslopes began in the late 1990s and quickly identified the potential importance of botanical controls on the properties and behaviour of the blanket peat involved in the failures. However, attempts to unravel some of these controls did not begin for several years. During 2010-12 investigations of the blanket peat at three relatively recent bogflows in northwest Ireland were done with the aim of establishing some form of relationship between botanical or paleoecological characteristics and standard physical and geotechnical properties, assuming the latter to be meaningful but recognising that this may not be the case. In-situ measurements and investigations at all three sites were followed by extensive laboratory characterisation of small core, block and monolith samples. The botanical composition of the peat could not be fully determined due to the very high degree of decomposition. However, analysis of macrofossils allowed distinct depth-related patterns of several key botanical indicators to be determined. In particular the monocotyledon fragments, dominated by Eriophorum vaginatum, showed distinct and potentially useful distributions throughout the peat profiles. Overall results showed that the basal peat at one of the sites was discernibly different from the other two sites having fewer monocotyledons, fewer fibres, higher dry bulk density and higher saturated hydraulic conductivity. This approach therefore offers a potential basis for developing a means of assessing peat mass characteristics from small auger samples. Key words Fabric/structure of soils, Landslides, Strength & testing of materials Notation F fibre content Fm fine fibre fraction of the peat (fragment of plant tissue 0.15-1.00 mm in any dimension) Rm coarse fibre fraction of the peat (fragment of plant tissue > 1 mm in any dimension) Ft total fibre fraction of the peat (all fibres > 0.15 mm in any dimension) Fh humus fraction of the peat (all particles < 0.15 mm in any dimension) FVS field vane strength MFt mass of the total fibre fraction (g) MFh mass of the humus fraction (g) Ms mass of oven-dried (105°C) peat sample-mass of ash (g)

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Section: Study Sitesmentioning

confidence: 95%

Section: Blanket Bog Failures In Irelandmentioning

confidence: 99%

Botanical and geotechnical characteristics of blanket peat at three Irish bogflows

Madio

Dykes

2022

Environmental Geotechnics

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“…These slides are described in detail by Dykes and Jennings (2011). Similar to the 2006 events a period of very heavy prolonged rainfall preceded the slides see Figure 5.…”

Section: Slidesmentioning

confidence: 63%

“…However these conventional stability analyses need to be treated with caution as they fail to capture the complexity of the failure zone in the sliding mass and in particular the lubricating role of water. (Dykes and Warburton, 2007) Number of events 1900-09 1910-19 1920-29 1930-39 1940-49 1950-59 1960-69 1970-79 1980-89 1990- …”

Section: Discussionmentioning

confidence: 99%

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Irish peat slides 2006–2010

Long

Jennings

Carroll³

2011

Landslides

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Publication information Landslides, 8 (3): 391-401Publisher Springer incidence of such events but they seem to occur in clusters with intervening quiet periods.These clusters coincide with periods of intense rainfall. For many slides at least two causal factors can be identified. Primarily these comprised intense rainfall but human activities such as road construction and peat cutting also contributed to the slides.Detailed geotechnical testing of the peat, including laboratory direct simple shear tests (DSS), is reported for two of the slides. Backanalysis of these two failures suggest that the mobilised strength of the material in the failure surface is similar to that measured in the DSS tests. However conventional geotechnical analyses need to be treated with caution as they fail to account for the complex interactions in the sliding surface and in particular the lubricating role of water.

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Peatlands and Windfarms: Conflicting Carbon Targets and Environmental Impacts

Lindsay¹

2018

The Wetland Book

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Peat slope failures and other mass movements in western Ireland, August 2008

Cited by 17 publications

References 20 publications

Botanical and geotechnical characteristics of blanket peat at three Irish bogflows

Botanical and geotechnical characteristics of blanket peat at three Irish bogflows

Irish peat slides 2006–2010

Peatlands and Windfarms: Conflicting Carbon Targets and Environmental Impacts

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