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ACKNOWLEDGEMENTSThe Geological Survey of Ireland (GSI) would like to thank all the members of the Irish Landslides WorkingGroup and their respective organisations for their participation in this project, and in particular the authorsof the various chapters in the report. The Institute of Geologists of Ireland (IGI) and Met Eireann were alsoassociated with the work of the Group and are thanked for their interest and participation. The BritishGeological Survey (BGS) is thanked for the permission to use some of their diagrams in the report. Themembers of the BGS Geohazards team, including Martin Culshaw, Alan Forster, and Andy Gibson, arethanked for their advice and encouragement. Local authorities in Ireland are thanked for their responseswith information about past landslide events. Christine Colgan, Niamh Redmond, and Charise McKeon arethanked for their development of the Irish Landslides Database in GSI. The GSI Cartography Unit isthanked for its work in the production and publication of this report.© Geological Survey of Ireland 2006.ISBNDesign and layoutby Cartography Unit.Printed by
CONTENTSPreface .................................................................................................................................................. iExecutive Summary .............................................................................................................................ii1. Introduction .................................................................................................................................. 11.1 Background.................................................................................................................................... 11.2 Irish Landslides Working Group...................................................................................................... 21.3 The Landslides Publication............................................................................................................. 32. Landslide Classification .............................................................................................................. 42.1 The Problem of Definition ............................................................................................................... 42.2 Landslide Movement Types ............................................................................................................ 42.3 Landslide Materials ........................................................................................................................ 72.4 Factors causing Landsliding ........................................................................................................... 83. The Irish Landslides Database ................................................................................................... 93.1 The Need for an Irish Landslides Database ..................................................................................... 93.2 Database Structure ........................................................................................................................ 93.3 Data Sources ................................................................................................................................. 93.4 Data Quality ................................................................................................................................... 103.5 Use of GIS in Landslides Research ................................................................................................ 113.6 General Analysis of Database Events ............................................................................................. 123.7 The Pollatomish Landslides - 2003 ................................................................................................. 153.8 The Derrybrien Landslide – 2003 .................................................................................................... 203.9 Irish Landslides Database - Recommendations .............................................................................. 214. Geotechnics of Landslides in Ireland ........................................................................................ 234.1 Introduction .................................................................................................................................... 234.2 Strength parameters of Soils and Rock .......................................................................................... 234.3 Role of water in landslides.............................................................................................................. 244.4 Geotechnics of landslides in “Mineral” soils.................................................................................... 264.5 Geotechnics of landslides in organic soils ...................................................................................... 274.6 Geotechnics of landslides in rock................................................................................................... 304.7 Recommendations for research ...................................................................................................... 315. Landslide Susceptibility Mapping in Ireland ............................................................................ 325.1 Landslide Susceptibility Mapping ................................................................................................... 325.2 Breifne Area Landslide Susceptibility Mapping ............................................................................... 47Chapter 5.2 Map Appendix ............................................................................................................. 59Chapter 5.2 Table Appendix ............................................................................................................ 636. Landslides and Planning ............................................................................................................ 656.1 Introduction .................................................................................................................................... 656.2 Current Practice on Landslides and Planning in Ireland .................................................................. 656.3 Building Control .............................................................................................................................. 676.4 Environmental Assessment ............................................................................................................ 68
Page 1 and 2: Landslides in IrelandGeological Sur
Page 3: LANDSLIDESinIRELANDEditorRonnie Cre
Page 7 and 8: Fig. 4.3 Forces caused by water in
Page 9 and 10: PREFACEUntil recently Ireland has b
Page 11 and 12: een very important in populating th
Page 13 and 14: involves a report on the current st
Page 15 and 16: Main Objectives• Increase public/
Page 17 and 18: 1. INTRODUCTIONRonnie Creighton1.1
Page 19: 1.3 The Landslides PublicationThis
Page 22 and 23: Peat flows are not nearly so well d
Page 24 and 25: In Ireland the Quaternary or uncons
Page 26 and 27: Journal - published papersLetter -
Page 28 and 29: Fig. 3.1 Two images showing the use
Page 30 and 31: Table 3.1 Landslide Events Per Coun
Page 32 and 33: Fig. 3.3 Location map of the Pollat
Page 34 and 35: 3.7.4 Quaternary GeologyQuaternary
Page 36 and 37: 3.8 The Derrybrien Landslide - 2003
Page 38 and 39: • The classification scheme shoul
Page 40 and 41: The force causing the block to slid
Page 42 and 43: Plate 4.1 Herringbone drainage syst
Page 44 and 45: 1210Number of events864Raised bogBl
Page 46 and 47: It is well known by research at Uni
Page 48 and 49: 5. LANDSLIDE SUSCEPTIBILITY MAPPING
Page 50 and 51: Two simplified hypothetical example
Page 52 and 53: 5.1.4 Mapping and GISBy definition,
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Platform / sensor pixel resolution(
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For this initial run, the criteria
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42Fig. 5.5 Peat and peaty podzols f
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for susceptibility mapping purposes
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elationships between developed susc
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The methodology used to derive the
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50Fig. 5.12. Landslide susceptibili
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52Table 5.6. Landslide classificati
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The percentage of events occurring
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with slope, overall 20-25% of all e
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As the dataset was not available at
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CHAPTER 5.2 - TABLE APPENDIXBedrock
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6. LANDSLIDES AND PLANNINGAileen Do
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6.2.4 Development ManagementThe phy
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6.5 Current Practice on Landslides
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7. LANDSLIDES IN NORTHERN IRELANDTe
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2. MudflowsPlate 7.1 Rotational Lan
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7.2 Carboniferous Cliff Lines (Co F
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8. RESEARCH ON IRISH LANDSLIDESKoen
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8.4 Research. Post-2003 AbstractsTa
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Identifying, recognizing, and predi
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In the case of vulnerability mappin
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Steep slopes in glacial tillMichael
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9. RECOMMENDATIONS FOR FUTURE WORK9
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Priority 1 Peat slides and peat str
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TEXT REFERENCESAcreman, M., 1991. T
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Skipper, J., Follett, B., Menkiti,
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APPENDIX 2Glossary of TermsBlanket
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APPENDIX 3Nomenclature for Landslid
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APPENDIX 4101
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103
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105
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Hammond, R. 1979. The Peatlands of
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APPENDIX 7Useful Web Linkswww.gsi.i
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