Irish peat slides 2006–2010

Long, Michael; Jennings, Paul; Carroll, Roselyn

doi:10.1007/s10346-011-0254-z

Cited by 12 publications

(9 citation statements)

References 5 publications

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“…While the occurrence of peat slides / flows is not a recent phenomenon, the need to develop infrastructure in these environments has brought about increased awareness of this geohazard. A number of significant peat slides / flows have been recorded since 2003 (Dykes and Warburton, 2007;Dykes and Warburton, 2008;Long et al, 2011), some of which occurred alongside engineering works. These have put emphasis on the need to consider peat stability during development of upland areas.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of peat strength for stability assessments

Boylan

Long

2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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SynopsisIn this paper guidance is given for the assessment of peat strength for stability assessments based on laboratory undrained simple shear tests (SS). When considering the stability of peat, these tests will yield a conservative estimation of the in-situ strength of the peat mass. The study was motivated by recent interest in renewable energy developments in upland peat areas. The results of more than 111 SS tests from 16 sites in Ireland, Scotland and the Netherlands were studied. It was found that peat strength is strongly influenced by its stress history and also varies as a function of the water content and degree of decomposition (fibre content). The normally consolidated normalised strength ratio (s u /σ v ') from SS tests of peat was found to be approximately 0.4, which is towards the lower bound of previously published data for peat. Comparisons of strengths derived from SS and field vane tests showed the ratio of the strength derived from the two tests was influenced by the degree of decomposition and that previously published correction factors for field vane strengths are inappropriate. Guidance is given for engineers working on future schemes on upland peat areas.

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Section: Introductionmentioning

confidence: 99%

Evaluation of peat strength for stability assessments

Boylan

Long

2014

Proceedings of the Institution of Civil Engineers - Geotechnica

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“…The island of Ireland is affected by numerous small-scale ground instabilities related to either land-sliding, peatlands, karstification, fluvial or coastal erosion ( Figure 2) [22][23][24]. Other instabilities relate to past or current anthropogenic activities, mainly drainage, construction, and mining.…”

Section: Ground Motion In Irelandmentioning

confidence: 99%

PS-InSAR Analysis of Sentinel-1 Data for Detecting Ground Motion in Temperate Oceanic Climate Zones: A Case Study in the Republic of Ireland

et al. 2019

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Regions of temperate oceanic climate have historically represented a challenge for the application of satellite-based multi-temporal SAR interferometry. The landscapes of such regions are commonly characterized by extensive, seasonally-variable vegetation coverage that can cause low temporal coherence and limit the detection capabilities of SAR imagery as acquired, for instance, by previous ERS-1/2 and ENVISAT missions. In this work, we exploited the enhanced resolution in space and time of the recently deployed Sentinel-1A/B SAR satellites to detect and monitor ground motions occurring in two study areas in the Republic of Ireland. The first, is a~1800 km 2 area spanning the upland karst of the Clare Burren and the adjacent mantled lowland karst of east Galway. The second, is an area of 100 km 2 in Co. Meath spanning an active mine site. The available datasets, consisting of more than 100 images acquired in both ascending and descending orbits from April 2015 to March 2018, were processed by using the Permanent Scatterer approach. The obtained results highlight the presence of small-scale ground motions in both urban and natural environments with displacement rates along the satellite line of sight up to −17 mm/year. Localized subsidence was detected in recently built areas, along the infrastructure (both roads and railways), and over the mine site, while zones of subsidence, uplift, or both, have been recorded in a number of peatland areas. Furthermore, several measured target points indicate the presence of unstable areas along the coastline. Many of the detected movements were previously unknown. These results demonstrate the feasibility of adopting multi-temporal interferometry based on Sentinel-1 data for the detection and monitoring of mm-scale ground movements even over small areas (<100 m 2 ) in environments influenced by temperate oceanic climate.

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“…The records used to populate the database were gathered in a manner compatible for the case histories on the rail network. The principal sources of information included the Geological Survey of Ireland's National Landslide Database (GSI, 2016), research papers (Bourke and Thorp, 2005;Long and Jennings, 2006;Boylan et al, 2008;Long et al, 2011) and newspaper reports. While the National Landslide Database contains a reasonably large dataset of landslides with excellent spatial accuracy, the vast majority of landslides have no date recorded.…”

Section: Comparison With Thresholds For Natural Landslides In Irelandmentioning

confidence: 99%

Rainfall thresholds as a landslide indicator for engineered slopes on the Irish Rail network

et al. 2018

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Rainfall thresholds express the minimum levels of rainfall that need to be reached or exceeded in order for landslides to occur in a particular area. They are a common tool in expressing the temporal portion of landslide hazard analysis. Numerous rainfall thresholds have been developed for different areas worldwide, however none of these are focused on landslides occurring on the engineered slopes on transport infrastructure networks. This paper uses empirical method to develop the rainfall thresholds for landslides on the Irish Rail network earthworks. For comparison, rainfall thresholds are also developed for natural terrain in Ireland. The results show that particular thresholds involving relatively low rainfall intensities are applicable for Ireland, owing to the specific climate. Furthermore, the comparison shows that rainfall thresholds for engineered slopes are lower than those for landslides occurring on the natural terrain. This has severe implications as it indicates that there is a significant risk involved when using generic weather alerts (developed largely for natural terrain) for infrastructure management, and showcases the need for developing railway and road specific rainfall thresholds for landslides.

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Irish peat slides 2006–2010

Cited by 12 publications

References 5 publications

Evaluation of peat strength for stability assessments

Evaluation of peat strength for stability assessments

PS-InSAR Analysis of Sentinel-1 Data for Detecting Ground Motion in Temperate Oceanic Climate Zones: A Case Study in the Republic of Ireland

Rainfall thresholds as a landslide indicator for engineered slopes on the Irish Rail network

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