Scottish Road Network Landslides Study - University of Glasgow

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34 INFORMATION SOURCES successfully in, for example, North London for failures in London Clay by talking into account its geotechnical properties and also in Builth Wells, Wales by including factors for the weathering behaviour of the local rock types. Field visits to sites of high landslide potential in the North London exercise have confirmed the presence of past and currently active landslides. Figure 3.3 – Age of available 1:50,000 geological maps. Figure 3.4 – Age of available 1:50,000 Quaternary (superficial deposits or drift) geological maps. The National Landslide Database: The national landslide database is believed to be the most advanced of any landslide database in Britain and comparable to the best internationally. It stores up to 70 different types of spatial, temporal, physical and environmental data as well as
35 INFORMATION SOURCES socio-economic impacts. The reference for the original source of the information such as BGS maps, journal references, PhD theses (and so on) is easily retrievable through the user interface. This enables more detail to be obtained by reference to the source material. Information is stored in 30 fully relational data tables, complemented by a series of history and trigger tables that provide a secure audit trail for data entry and update. Four interfaces are available according to needs and there is a choice of hardcopy, computer or graphical information system front end. It currently contains nearly 10,000 entries for Great Britain over 1,200 of which relate to Scotland. The dataset has been compiled from a wide range of sources apart from BGS maps and it contains landslides that do not appear on the BGS maps. Similarly there are landslides on the more recently revised geological maps that have yet to be entered into the database. Revision of the database to include recent events or recently mapped landslides is an ongoing task but is constrained by available resources and other commitments. The National Geotechnical Database: The national geotechnical database is used primarily to hold and analyse geotechnical data collected for the geological formation studies of the ‘Engineering behaviour of British rocks and soils project’ and the British geological hazards project. Thus, while it may not contain many data relevant to the study of debris flows and the Scottish trunk road network, it does offer an advanced, highly developed and proven geotechnical database that could be used with immediate effect to contain and analyse those data contained within the ground investigation reports relevant to the assessment of the potential for debris flow hazards. Borehole records and site investigation records: The BGS borehole records collection for Scotland comprises borehole logs from site investigations, well bores, mineral bores, research bores which are held as paper copies and digital scans. They are available to BGS staff through a graphical data interface (GDI) that enables borehole locations to be viewed in conjunction with a wide range of other data layers. The digital scan may be retrieved through the GDI (Figure 3.5). The areal distribution is irregular but mainly concentrated in urban areas and along linear routes. The BGS site investigation report collection for Scotland contains mainly factual reports that describe the location, purpose and test data relating to the borehole database but may also contain interpretative reports and reports from other investigations such as penetrometer data and geophysical survey data. The geographical location of the investigation, as outline boxes, may be viewed using the BGS graphical data interface (GDI) (Figure 3.6). The reports are held as a microfiche archive and have also been scanned (from the microfiche archive) but they have not yet been made available (readily) to BGS staff this is due to the difficulties of indexing them to a borehole level. It is intended to make an index to SI report level available in November 2004 within BGS. Other data: The BGS data holding also contains numerous reports, sheet descriptions, sheet memoirs, geologist notebooks and photographs that date from the formation of the survey to the present which contain information relevant to hazard assessment but are too diverse to be listed or described in detail in this report. These data are most likely to be useful at the local or site specific level of hazard assessment.
Page 1 and 2: Scottish Road Network Landslides St
Page 3 and 4: Electronic copies of this report ma
Page 5 and 6: MINISTERIAL FOREWORD The landslide
Page 7 and 8: 3 WORKING GROUP Dr Roger Moore: Rog
Page 9 and 10: 5 EXECUTIVE OVERVIEW Outlining poss
Page 11 and 12: 7 EXECUTIVE OVERVIEW The initial st
Page 13 and 14: 1 INTRODUCTION TO LANDSLIDE HAZARDS
Page 15 and 16: 11 INTRODUCTION Section 6 describes
Page 17 and 18: 13 BACKGROUND However, Varnes (1978
Page 19 and 20: 15 BACKGROUND squares that showed s
Page 21 and 22: 17 BACKGROUND events that do not im
Page 23 and 24: 19 BACKGROUND The A9 was blocked by
Page 25 and 26: 21 BACKGROUND important to note tha
Page 27 and 28: 23 BACKGROUND earthworks stability
Page 29 and 30: 3 DEBRIS FLOW INFORMATION SOURCES b
Page 31 and 32: 27 INFORMATION SOURCES whereas stre
Page 33 and 34: 29 INFORMATION SOURCES Detailed haz
Page 35 and 36: 7. Meteorological: a) Antecedent ra
Page 37: 33 INFORMATION SOURCES 1:50,000 sca
Page 41 and 42: 37 INFORMATION SOURCES Figure 3.6 -
Page 43 and 44: 39 INFORMATION SOURCES team using a
Page 45 and 46: 41 INFORMATION SOURCES events would
Page 47 and 48: NEXTMap Britain Digital Terrain Mod
Page 49 and 50: 4 DEBRIS FLOW TYPES AND MECHANISMS
Page 51 and 52: 47 TYPES AND MECHANISMS damage. Exa
Page 53 and 54: 49 TYPES AND MECHANISMS Figure 4.4
Page 57 and 58: 53 TYPES AND MECHANISMS The shear r
Page 59 and 60: Preparatory Factors 55 TYPES AND ME
Page 61 and 62: 57 TYPES AND MECHANISMS Road cuts m
Page 63 and 64: 59 TYPES AND MECHANISMS such featur
Page 65 and 66: 61 TYPES AND MECHANISMS ruptures to
Page 67 and 68: 4 6 10 -6 10 m/s -6 10 m/s -6 m/s L
Page 69 and 70: 65 TYPES AND MECHANISMS detachment
Page 73 and 74: 69 CONTRIBUTORY FACTORS There is ho
Page 75 and 76: 5.1.2 Geological, Geotechnical and
Page 77 and 78: 73 CONTRIBUTORY FACTORS Other hydro
Page 79 and 80: 75 CONTRIBUTORY FACTORS to the fail
Page 81 and 82: 77 CONTRIBUTORY FACTORS 5.3 FACTORS
Page 83 and 84: 79 CONTRIBUTORY FACTORS upon the lo
Page 85 and 86: 6 PROPOSED METHODOLOGY FOR DEBRIS F
Page 87 and 88: 83 PROPOSED METHODOLOGY ground is u
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85 PROPOSED METHODOLOGY presence of
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87 PROPOSED METHODOLOGY The exposur
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89 PROPOSED METHODOLOGY Once a haza
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A84 South of Strathyre (8km) HIGH H
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HIGH HAZARD AREAS AND EARLY OPPORTU
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8 DEBRIS FLOW MANAGEMENT AND MITIGA
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8.2.3 United Kingdom MANAGEMENT AND
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MANAGEMENT AND MITIGATION OPTIONS D
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MANAGEMENT AND MITIGATION OPTIONS a
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MANAGEMENT AND MITIGATION OPTIONS N
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MANAGEMENT AND MITIGATION OPTIONS r
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MANAGEMENT AND MITIGATION OPTIONS F
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9 SUMMARY AND RECOMMENDATIONS FOR D
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SUMMARY AND RECOMMENDATIONS The ini
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SUMMARY AND RECOMMENDATIONS extensi
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115 REFERENCES Chan, R. K. S. 2000.
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117 REFERENCES Moore, R., Lee, E. M
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APPENDIX - PROJECT WORKSHOP AGENDA
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Scottish Road Network Landslides Study - University of Glasgow

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