Scottish Road Network Landslides Study - University of Glasgow

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40 INFORMATION SOURCES Storm Track Data: The MO have done some work on storm tracks across the UK and the number of storms passing through each year it has not yet appeared in print and it has probably not been done for Scotland alone. However, a contact at the MO has informally advised that it should be possible to generate such information from the available data. Figure 3.8 – Example of Meteorological Office 30-year monthly average snowfall data (image courtesy of the Meteorological Office). 3.3.4 River and Stream Data River and stream gauging data is also available from the Scottish Environment Protection Agency (SEPA) (www.sepa.org.uk). Preliminary attempts have been made to relate debris flow activity at Stromeferry to stream gauging data on the River Carron, some 5km to the north east, by (Nettleton et al., In Press). These indicate that a good correlation can be achieved provided that the data available is relevant to the area under consideration. Four
41 INFORMATION SOURCES events would have been forecast rather than the three experienced over a three year period. This work also shows a similar correlation with rainfall, albeit from a station at Plockton around 10km to the west. The Flood Estimation Handbook (Anon, 1999) contains river and stream catchment data (e.g. return period, capacity and flow) that could be useful in relation to determining slopes prone to debris flows. 3.3.5 Land Use Data The majority of relevant land use data appears to be available from the Centre for Ecology and Hydrology. The Land Cover Map of Great Britain (1990) is a digital dataset, providing classification of land cover types into 25 classes, at a 25m (or greater) resolution. The map provides: The first complete map of the land cover of Great Britain since the 1960s. The first comprehensive map of the land cover of Great Britain created from satellite information. The first digital map of national land cover. Accuracy to the field scale, checked against ground survey. The Land Cover Map comprises 25 classes as listed in Table 3.1 those classes that are particularly relevant to the assessment of debris flows in upland areas are highlighted 13 . Data Availability: Data are available in two ways - within the Countryside Information System (1km resolution only), and as stand-alone datasets, at 25m and 1km resolutions. Stand-alone datasets are provided, to the customer’s requirements, for any area of the country. Areas of data are cut out as a box by using Ordnance Survey grid references. Data is available at 25m resolution or 1km resolution in either a percentage or dominant value dataset. Other intermediate resolutions can be created as well. Charges and licensing: Data charges are in three bands, according to end use, in accordance with NERC's Data Policy. These bands are commercial (highest rate), non-commercial, and research use (lowest). UK academics may be entitled to further reductions, subject to NERC arrangements. Data is supplied under licence. A wide variety of licences can be provided, from single user research licence to a corporate multi-user, multi-site licence. Application to potential debris flow hazard assessment: This data set will have potential use in inferring the groundwater conditions because the nature of the vegetation will be influenced by the available moisture (e.g. ‘bog’ implies permanent saturation). There are also implications for the reinforcement of slopes by plant roots and for the removal of moisture by plant cover, which will depend on the species present, and the maturity of the cover. Conversely, recently felled tree cover may both reduce the strengthening effect and increase the presence of water due to reduced root uptake in addition to the potential for rotted tree roots to aid infiltration during high rainfall events. 13 Further information from: http://www.ceh.ac.uk/data/lcm/LCMclassInfo.shtm.
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 and 38: 33 INFORMATION SOURCES 1:50,000 sca
Page 39 and 40: 35 INFORMATION SOURCES socio-econom
Page 41 and 42: 37 INFORMATION SOURCES Figure 3.6 -
Page 43: 39 INFORMATION SOURCES team using a
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
Page 89 and 90: 85 PROPOSED METHODOLOGY presence of
Page 91 and 92: 87 PROPOSED METHODOLOGY The exposur
Page 93 and 94: 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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