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Initiation of a multiple peat slide on Cuilcagh Mountain, Northern Ireland
Earth surface processes and landforms, 2001-04, Vol.26 (4), p.395-408
Dykes, A. P.
Kirk, K. J.
2001
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Dykes, A. P.
Kirk, K. J.
Titel
Initiation of a multiple peat slide on Cuilcagh Mountain, Northern Ireland
Ist Teil von
Earth surface processes and landforms, 2001-04, Vol.26 (4), p.395-408
Ort / Verlag
Chichester, UK: John Wiley & Sons, Ltd
Erscheinungsjahr
2001
Quelle
Wiley Online Library - AutoHoldings Journals
Beschreibungen/Notizen
In October 1998 a multiple peat slide occurred on the northern slopes of Cuilcagh Mountain, Co. Fermanagh, in response to a high‐magnitude rainfall event. Few peat slides have been recorded in Ireland, and a detailed field survey and investigation of the failure was undertaken within four weeks of the event. The morphological evidence indicated a distinct sequence of events which appeared to begin with the failure of a small segment of slope above a degraded transverse drainage ditch which was cut less than ten years previously. This segment of slope was no more than 42 m wide and 25 m long, with 0·7 m of peat overlying up to 0·5 m of a pale coloured clay, the latter containing small pipes and resting on the surface of a darker coloured loamy material. The failure surface was located at or near the base of the pale clay layer. Finite element software was used to model hydrological conditions within the upper segment of slope and to calculate factors of safety for different slope configurations including the presence or absence of a drain or a subsurface pipe. Using the peak shear strength of the pale clay, as determined in the laboratory, both the drain and subsurface pipes were required to obtain a factor of safety of 1·0 or less. Allowing for the uncertainties associated with the hydrological modelling of the pipes, it is suggested that the cutting of the drain and the hydrological impacts of its subsequent degradation are ultimately responsible for the failure. Copyright © 2001 John Wiley & Sons, Ltd.
Sprache
Englisch
Identifikatoren
ISSN: 0197-9337
eISSN: 1096-9837
DOI: 10.1002/esp.188
Titel-ID: cdi_proquest_miscellaneous_17895055
Format
–
Schlagworte
Bgi / Prodig
,
blanket bog
,
Earth sciences
,
Earth, ocean, space
,
Eire, Cuilcagh Mt
,
Exact sciences and technology
,
Geomorphology
,
Geomorphology, landform evolution
,
mass movement
,
peat slide
,
Physical geography
,
slope stability modelling
,
Slopes
,
Surficial geology
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