| Description | This report explains what landslides are, how they can be assessed in terms of the hazards they create and the exposure to road users, identifies areas of high hazard that currently exist in scotland and makes recommendations as to how the future detailed assessment of the scottish road network could be undertaken and the management approaches which could be adopted to mitigate the effects.
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| Website Publication Date | July 12, 2005 |
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Editors: M G Winter (
TRL Limited), F Macgregor and L Shackman
(Scottish Executive)
ISBN
0 7559 4649 9
This document is also available in pdf format:
part 1 (1.1mb),
part 2 (1.8mb)
Contents
FOREWORD
WORKING GROUP MEMBERS AND REPORT
CONTRIBUTORS
EXECUTIVE OVERVIEW
1 INTRODUCTION TO LANDSLIDE
HAZARDS
2 BACKGROUND TO SCOTTISH LANDSLIDES
AND DEBRIS FLOWS
2.1 Landslides
2.2 Recent Debris Flows
2.3 Climatic Issues
2.4 Current Inspection and Maintenance Arrangements
2.5 Potential Third Party Issues
3 DEBRIS FLOW INFORMATION
SOURCES
3.1 Key Findings from the Literature
3.2 The Project Workshop
3.3 Potential Third Party Issues
4 DEBRIS FLOW TYPES AND
MECHANISMS
4.1 Flows
4.2 Debris Flows
4.3 Principles of Rapid Landslide Development
5 KEY CONTRIBUTORY FACTORS TO DEBRIS
FLOWS
5.1 Hazard Factors Affecting Debris Flow Occurrence
5.2 Hazard Factors Affecting Debris Flow Run-Out
5.3 Factors Affecting Exposure to Debris Flow
Hazards
5.4 Summary of Key Contributory Factors
6 PROPOSED METHODOLOGY FOR DEBRIS
FLOW ASSESSMENT
6.1 Hazard Assessment
6.2 Hazard Ranking
6.3 Detailed Assessment Factors
7 HIGH HAZARD AREAS AND EARLY
OPPORTUNITIES IN SCOTLAND
7.1 Areas of High Perceived Hazard
7.2 Early Opportunities
8 DEBRIS FLOW MANAGEMENT AND
MITIGATION OPTIONS
8.1 Managing the Asset
8.2 Approaches to Landslide Management
8.3 Asset Management for Trunk Road Slopes
8.4 Mitigation Techniques
9 SUMMARY AND RECOMMENDATIONS FOR
DEBRIS FLOWS IN SCOTLAND
9.1 Summary
9.2 Recommendations
REFERENCES
APPENDIX - PROJECT WORKSHOP
AGENDA
Cover Photograph (© Perthshire Picture Agency,
PPA:
www.ppapix.co.uk
):The A85 in Glen Ogle blocked by two debris flows on 18
August 2004.
RAF and Royal Navyhelicopters are
pictured airlifting some of the 57 occupants from the 20
trapped vehicles tosafety.
Electronic copies of this report may be obtained
from the Scottish Executive web site (www.scotland.gov.uk).
The views expressed in this report are those of
the Editors and Authors and do not necessarily
represent those of the Department or Scottish
Ministers.
The Scottish Executive and Astron would like to point
out that some of the images in this document are of a
poorer quality than would normally appear in their
documents. This is because some photographs were taken on
digital cameras, mobile phone cameras and/or in difficult
conditions. In addition, some of the graphs and images used
have been necessarily downloaded from websites at low
resolutions which are of a poor reproductive quality when
printed.
© Crown Copyright 2005. Except as otherwise
stated.Limited extracts from the text may be reproduced
provided the source is acknowledged. For more extensive
reproduction, please write to theChief Road Engineer,
Scottish Executive, Victoria Quay, Edinburgh,EH6 6QQ.
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