to download report - Geological Survey of Ireland

More documents

Recommendations

Info

Plate 1.2 Pollatomish Landslides, Co. MayoPredictions have been made about the impact of global warming on Ireland (Sweeney, 1997). In summarythese predictions indicate a change to wetter winters and drier summers. In addition there may be an increasein frequency of high intensity rainfall events. Such precipitation changes could have serious implications forslope stability. Given this scenario it is important than an assessment of landslide hazard is undertaken and tothis end the Geological Survey of Ireland (GSI) set up the Irish Landslides Working Group (ILWG) to examinethe issue.1.2 Irish Landslides Working GroupThe Irish Landslides Group (ILWG) was established in early 2004 as a direct response to the landslides in theautumn of 2003. It was felt important that it should be a multi-disciplinary team, bringing together various typesof expertise which are relevant to landslide studies. This point is often stressed in the international literature onthe subject (Brunsden,1993). The Group includes expertise on geology (Bedrock and Quaternary),geomorphology, geotechnical engineering, planning, and GIS. The participants were drawn from state andsemi-state agencies, and also the universities (Appendix 1).Main objectives:-1. Build a national database of past landslide events2. Examine geotechnical parameters with regard to landslides.3. Assess the potential for landslide susceptibility mapping in Ireland.4. Make recommendations on the integration of landslide hazard issues into the planning process.5. Promotion of landslide research in Ireland.6. Raise public awareness about landslide hazard in Ireland.It is not within the remit of the ILWG to undertake site-specific studies at landslide events as they occur but tocollate data on landslides at a national level in order to make recommendations for future mitigation of landsliderisk.The work of the Group was focused on landslide events inland on the island of Ireland and the group was alsovery keen that it should be an all-Ireland project. It did not consider submarine slope failures or coastal landslidescaused by marine erosion. This latter is a very important category of slope failure in Ireland as indicated by theproblems of marine erosion around our coasts. However it was decided that the ILWG could not cover this inany detail, as it was felt the group did not have the resources within its timeframe of operation to examine itadequately, and also because information on coastal instability is very poorly collated and there is very limitedpublished data. It is certainly a topic for future study both at a national and regional level.2
1.3 The Landslides PublicationThis publication has been written by members of the ILWG and produced by the GSI. It is very difficult to tailorsuch a publication for a wide range of readership. It began as a short general report on landslides in Ireland.However as the project progressed a substantial body of work was assembled which had to be documented.The style of the publication was therefore revised substantially. The main objectives are to inform the widerpublic in Ireland about landslides in general, and also to provide technical data and discussion on some coreissues for those who have a professional or academic interest, or indeed responsibility with regard to landslides.It seeks to describe the various types of landslides that can occur, including the earth materials involved andthe mechanisms of failure, and to illustrate the amount of information that is available about past landslideevents. Consideration is also given to the geotechnical parameters involved in slope failure and landslidesusceptibility mapping for Ireland. The integration of landslide issues into public planning policies is crucial tothe future limitation of landslide hazard in the context of sustainable landscape development. It also documentslandslides research to date and examines future strategies in this regard. Above all it aims to increase awarenessabout slope instability and landslide hazard in Ireland. This is addressed in one of main recommendations inChapter 9:-Public Awareness/OutreachIt is important that there is much greater public awareness of landslide hazard in Ireland so that the generalpublic know of the potential for slope instability in certain areas and the possible consequences in terms of lifeand property.Main Objectives• Increase public/private sector awareness of landslide hazard in Ireland• Provide practical support and guidance to developers/regulators3
Page 1 and 2: Landslides in IrelandGeological Sur
Page 3 and 4: LANDSLIDESinIRELANDEditorRonnie Cre
Page 5 and 6: CONTENTSPreface ...................
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: 1. INTRODUCTIONRonnie Creighton1.1
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(
Page 56 and 57: For this initial run, the criteria
Page 58 and 59: 42Fig. 5.5 Peat and peaty podzols f
Page 60 and 61: for susceptibility mapping purposes
Page 62 and 63: elationships between developed susc
Page 64 and 65: The methodology used to derive the
Page 66 and 67: 50Fig. 5.12. Landslide susceptibili
Page 68 and 69:
52Table 5.6. Landslide classificati
Page 70 and 71:
The percentage of events occurring
Page 72 and 73:
with slope, overall 20-25% of all e
Page 74 and 75:
As the dataset was not available at
Page 79 and 80:
CHAPTER 5.2 - TABLE APPENDIXBedrock
Page 81 and 82:
6. LANDSLIDES AND PLANNINGAileen Do
Page 83 and 84:
6.2.4 Development ManagementThe phy
Page 85 and 86:
6.5 Current Practice on Landslides
Page 88 and 89:
7. LANDSLIDES IN NORTHERN IRELANDTe
Page 90 and 91:
2. MudflowsPlate 7.1 Rotational Lan
Page 92 and 93:
7.2 Carboniferous Cliff Lines (Co F
Page 95 and 96:
8. RESEARCH ON IRISH LANDSLIDESKoen
Page 97 and 98:
8.4 Research. Post-2003 AbstractsTa
Page 99 and 100:
Identifying, recognizing, and predi
Page 101 and 102:
In the case of vulnerability mappin
Page 103 and 104:
Steep slopes in glacial tillMichael
Page 105 and 106:
9. RECOMMENDATIONS FOR FUTURE WORK9
Page 107 and 108:
Priority 1 Peat slides and peat str
Page 109 and 110:
TEXT REFERENCESAcreman, M., 1991. T
Page 111 and 112:
Skipper, J., Follett, B., Menkiti,
Page 113 and 114:
APPENDIX 2Glossary of TermsBlanket
Page 115 and 116:
APPENDIX 3Nomenclature for Landslid
Page 117 and 118:
APPENDIX 4101
Page 119 and 120:
103
Page 121 and 122:
105
Page 123 and 124:
Hammond, R. 1979. The Peatlands of
Page 125:
APPENDIX 7Useful Web Linkswww.gsi.i
show all

to download report - Geological Survey of Ireland

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?