Scottish Road Network Landslides Study: Implementation

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Publication Date:

06/10/2008

Publication Summary:

A comprehensive study of the future risk of landslides in Scotland and the evidence that we require to properly plan for and manage that risk. This report was published on 6 October 2008.

Full Report available in PDF format (8 Mb)

The full report, containing the graphics in high resolution is available in PDF Format (15 Mb). Note that due to the file size it is likely to take at least 10 minutes to open. We recommend that to open the report you save the file to your computer and then open from there (by right clicking your mouse on the link and selecting 'save target as').

Editors

M G Winter (Transport Research Laboratory),
F Macgregor (Consultant to Transport Scotland) and
L Shackman (Transport Scotland)

Contents

MINISTERIAL FOREWORD

EDITORS AND REPORT CONTRIBUTORS

EXECUTIVE OVERVIEW

1 INTRODUCTION (Available in PDF format containing high resolution graphics- 160kb)

2 LANDSLIDE EVENTS (Available in PDF format containing high resolution graphics- 2.7 Mb)
2.1 Landslides and Debris Flow
2.2 Events of August 2004
2.3 Other Events
2.4 Seasonality

3 RESPONSE TO THE 2004 EVENTS (Available in PDF format containing high resolution graphics- 530kb)
3.1 Immediate Actions
3.2 Development of Future Management Options
3.3 Dissemination
3.4 Risk Issues in Context

4 GIS-BASED ASSESSMENT (Available in PDF format containing high resolution graphics- 1.5 Mb)
4.1 Introduction
4.2 Background
4.3 Debris Flow Potential Assessment
4.4 GIS Methodology
4.5 Results
4.6 Conclusions

5 INTERPRETATION OF THE GIS-BASED ASSESSMENT (Available in PDF format containing high resolution graphics- 1 Mb)
5.1 Description of Data
5.2 Methodology and Outcomes
5.3 Selection of Routes for Site-Specific Assessments

6 SITE-SPECIFIC ASSESSMENT METHODOLOGY (Available in PDF format containing high resolution graphics- 550kb)
6.1 Introduction
6.2 The Inspection Process
6.3 Site-Specific Assessment results

7 SITE-SPECIFIC ASSESSMENT RESULTS (Available in PDF format containing high resolution graphics- 360kb)
7.1 Introduction
7.2 Exposure Scores
7.3 Hazard Rankings
7.4 Re-Inspection Programme
7.5 Rock Slopes

8 MANAGEMENT OF HIGH HAZARD RANKING AREAS (Available in PDF format containing high resolution graphics- 2.2 Mb)
8.1 Techniques for Exposure Reduction
8.2 Techniques for Hazard Reduction
8.3 Management Actions

9 LANDSLIDES, CLIMATE CHANGE, RAINFALL AND FORECASTING (Available in PDF format containing high resolution graphics- 600kb)
9.1 Introduction
9.2 Climatic Influences on Landslides
9.3 Generalised Forecasting Methods
9.4 Case Studies
9.5 A Trigger Threshold for Scotland
9.6 Conclusions

10 CONCLUSIONS AND RECOMMENDATIONS (Available in PDF format containing high resolution graphics- 160Kb)
10.1 Summary and Conclusions
10.2 Recommendations

ACKNOWLEDGEMENTS (Available in PDF format containing high resolution graphics- 125kb)

REFERENCES (Available in PDF format containing high resolution graphics- 200kb)

APPENDIX A SUPPLEMENTARY INFORMATION FOR THE GIS ASSESSMENT (Available in PDF format containing high resolution graphics- 200kb)

APPENDIX B GIS-BASED ASSESSMENT INTERPRETATION RESULTS (Available in PDF format containing high resolution graphics- 270kb)
B.1 Initial Interpretation
B.2 Secondary Interpretation

APPENDIX C RESULTS FROM SITE-SPECIFIC ASSESSMENTS (Available in PDF format containing high resolution graphics- 1.4 Mb)
C.1 Sample Site Inspection Reports and Score Sheets
C.2 Hazard Scores

APPENDIX D HAZARD, EXPOSURE AND HAZARD RANKINGS RESULTS (Available in PDF format containing high resolution graphics- 200kb)
D.1 Exposure Scores
D.2 Final Hazard Scores and Hazard Rankings

APPENDIX E A BRIEF INTERNATIONAL REVIEW OF THE SIGNING OF LANDSLIDE AND OTHER HAZARDS (Available in PDF format containing high resolution graphics- 1.1 Mb)
E.1 United Kingdom
E.2 New Zealand
E.3 Greece
E.4 Canada
E.5 Hong Kong SAR
E.6 Croatia
E.7 United States of America

APPENDIX F DRAFT TRANSPORT SCOTLAND LEAFLET: SCOTTISH ROADS AND LANDSLIDES (Available in PDF format containing high resolution graphics- 350kb)
F.1 Precautions for Safer Journeys
F.2 Context
F.3 Transport Scotland Actions

APPENDIX G LANDSLIDES AND RAINFALL: CASE STUDIES (Available in PDF format containing high resolution graphics- 2.5 Mb)
G.1 Australia
G.2 Hong Kong SAR
G.3 Italy
G.4 Jamaica
G.5 Nepal
G.6 Norway
G.7 Singapore
G.8 Slovenia
G.9 Switzerland
G.10 United Kingdom
G.11 United States of America
G.12 Other Regions and Countries
Annex G.1 Method Adopted in Preliminary Assessment by Evans (1997)

APPENDIX H DEVELOPMENT OF A RAINFALL TRIGGER THRESHOLD FOR DEBRIS FLOW255 (Available in PDF format containing high resolution graphics- 1.3 Mb)
H.1 Methodology and Sample Results
H.2 Discussion of Results
H.3 Conclusions
Annex H.1 System for Future Back Analysis

Further copies of this document are available, on request, in audio and large print formats and in community languages, please contact:

info@transportscotland.gsi.gov.uk or phone 0141 272 7100

The views expressed in this report are those of the Editors and Authors and do not
necessarily represent those of Transport Scotland or Scottish Ministers.