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6.5 Current Practice on Landslides and Planning in the United Kingdom .............................................. 696.6 Recommendations for the inclusion of landslide hazard issues in the planning process ................. 707. Landslides in Northern Ireland ............................................................................................... 727.1 Antrim Plateau Escarpment Instability (Counties Antrim & Londonderry) .................................... 727.2 Carboniferous Cliff Lines (Co. Fermanagh) .................................................................................. 767.3 Peat Failure (Bog Bursts and Peat Slides) ................................................................................. 767.4 Land Use Planning and Development Control in Landslide Susceptible Areas ............................ 777.5 Some Thoughts about the Future ............................................................................................... 777.6 Conclusions and Recommendations .......................................................................................... 788. Landslide Research in Ireland ............................................................................................... 798.1 Introduction ................................................................................................................................ 798.2 Research Pre- 2003 ................................................................................................................... 798.3 Research Workshop. TCD 2004 ................................................................................................. 808.4 Research post- 2003 – Abstracts ............................................................................................... 818.5 Recommendations ..................................................................................................................... 889. Recommendations for Future Work ....................................................................................... 899.1 Introduction ................................................................................................................................ 899.2 Recommendations for Future Work ............................................................................................ 899.3 Strategic framework for future work on landslides ....................................................................... 92Text References ............................................................................................................................... 93Appendix 1 Irish Landslides Working Group Members .................................................................... 96Appendix 2 Glossary of Terms ........................................................................................................ 97Appendix 3 Nomenclature for Landslides ........................................................................................ 99Appendix 4 Database Structure .................................................................................................... 101Appendix 5 Landslide Events in Ireland ......................................................................................... 102Appendix 6 Landslides Bibliography for Ireland ............................................................................. 106Appendix 7 Useful Web Links....................................................................................................... 109LIST OF FIGURESFig. 2.1 Landslide Classification ..................................................................................................... 5Fig. 2.2 Landslide Features ............................................................................................................ 6Fig. 3.1 Two images showing the use of GIS spatial and topographic datasets tolocate a landslide event .................................................................................................... 12Fig. 3.2 National Landslides Map .................................................................................................. 13Fig. 3.3 Location map of Pollatomish ............................................................................................ 16Fig. 3.4 Bedrock Geology of the Pollatomish area ........................................................................ 17Fig. 3.5 Location of the Derrybrien landslide.................................................................................. 20Fig. 4.1 Stability of wedge of soil or rock. A) dry slope B) with water pressures ............................. 23Fig. 4.2 Stress/strain behaviour of a clay soil ................................................................................ 24
Fig. 4.3 Forces caused by water in vertical cracks ........................................................................ 25Fig. 4.4 Effect of water seepage in granular soils .......................................................................... 25Fig. 4.5 Number of peat slides per month (based on Alexander et al., 1985) ................................. 28Fig. 4.6 Rainfall data for Dromahair, Co. Leitrim (based on Alexander et al., 1985) ........................ 29Fig. 5.1 Example of qualitative risk matrix (after Lee and Jones, 2004) .......................................... 34Fig. 5.2 The concept of overlay analysis in GIS ............................................................................. 36Fig. 5.3 Model schematic for first susceptibility map ..................................................................... 40Fig. 5.4 Slope and Peat inputs to first run of susceptibility map .................................................... 41Fig. 5.5 Peat and peaty podzols from NSS Soil map of West Mayo and peat land cover types ..... 42Fig. 5.6 Results of both susceptibility runs. Susceptible areas shown in red ................................. 43Fig. 5.7 Model schematic for second susceptibility map ............................................................... 44Fig. 5.8 Final susceptibility map and recorded landslide events .................................................... 45Fig. 5.9 Proportions of susceptibility by three approaches ............................................................ 45Fig. 5.10 Breifne Area outlined in red. Location of areas where landslide mapping hasbeen focused in purple ..................................................................................................... 47Fig. 5.11 Satellite image and aerial photograph of the same area.................................................... 49Fig. 5.12 Landslide susceptibility mapping methodology ................................................................. 50Fig. 5.13 Percentage of Landslides by bedrock type ....................................................................... 54Fig. 5.14 Percentage of Landslides by soil parent material type ...................................................... 55Fig.5.15 Percentage of Landslides by land cover type .................................................................... 55Fig 5.16 Percentage of Landslides by slope gradient ..................................................................... 55Fig. 5.17 Percentage of Landslides by aspect range ....................................................................... 56Fig. 5.18 Percentage of Landslides by elevation range .................................................................... 56Fig. 7.1 Principal Areas of Landslide Around the Basalt Plateau (Counties Antrim & Londonderry) 72Fig. 7.2 Generalised Landslip Model, Co. Antrim ........................................................................... 73Fig. 7.3 Mudflow and Rockfall Localities on the east Antrim coast (after Prior et al., 1971) ............ 75Fig. 8.1 Map of locality showing source of flow and stream sections, a bog flow atStraduff Townland, Co. Sligo (Alexander et al., 1986)........................................................ 79Fig. 8.2 (a) Location of the study site at Cuilcagh. (b) Location of the peat slide onCuilcagh Mountain (Dykes and Kirk, 2001)....................................................................... 80Fig. 8.3 GPR profile along a survey line above the scar that is located to the south of the survey .. 82Fig. 8.4 Landsat image draped over DEM used in relic bog burst detection ................................... 83Fig. 8.5 Peat slide in Co. Wicklow ................................................................................................ 84Fig. 8.6 Locations of known landslides in Ireland ........................................................................... 85Fig. 8.7 Ireland’s Offshore Area and a large-scale failure on the Rockall Bank ............................... 86
Page 1 and 2: Landslides in IrelandGeological Sur
Page 3 and 4: LANDSLIDESinIRELANDEditorRonnie Cre
Page 5: CONTENTSPreface ...................
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,
Page 54 and 55: 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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