GSI3D Model Metadata Report for HS2 Area 7 (Hampton in Arden to Drayton Bassett)
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GSI3D model metadata report for HS2 Area 7 (Hampton in Arden to Drayton Bassett) Geology and Regional Geophysics Open Report OR/15/073 BRITISH GEOLOGICAL SURVEY GEOLOGY AND REGIONAL GEOPHYSICS PROGRAMME OPEN REPORT OR/15/073 GSI3D model metadata report for HS2 Area 7 (Hampton in Arden to Drayton Bassett) The National Grid and other Ordnance Survey data © Crown Copyright and database rights K. Ambrose 2017. Ordnance Survey Licence No. 100021290. Edits by A. M. Barron, H. Burke and H. V. Gow Keywords Report; 3D model; GSI3D; HS2; linear route National Grid Reference SW corner 41690 27963 Centre point 41909 29226 NE corner 42074 30367 Map Sheets 154, 168, 169 Bibliographical reference AMBROSE, K. 2017. GSI3D model metadata report for HS2 Area 7 (Hampton in Arden to Drayton Bassett). British Geological Survey Open Report, OR/15/073. 22pp. Copyright in materials derived from the British Geological Survey’s work is owned by the Natural Environment Research Council (NERC) and/or the authority that commissioned the work. You may not copy or adapt this publication without first obtaining permission. Contact the BGS Intellectual Property Rights Section, British Geological Survey, Keyworth, e-mail [email protected]. You may quote extracts of a reasonable length without prior permission, provided a full acknowledgement is given of the source of the extract. Maps and diagrams in this book use topography based on Ordnance Survey mapping. © NERC 2017. All rights reserved Keyworth, Nottingham British Geological Survey 2017 BRITISH GEOLOGICAL SURVEY The full range of our publications is available from BGS shops at British Geological Survey offices Nottingham, Edinburgh, London and Cardiff (Welsh publications only) see contact details below or shop online at www.geologyshop.com BGS Central Enquiries Desk Tel 0115 936 3143 Fax 0115 936 3276 The London Information Office also maintains a reference collection of BGS publications, including maps, for consultation. email [email protected] We publish an annual catalogue of our maps and other publications; this catalogue is available online or from any of the BGS shops. 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EH14 4AP The British Geological Survey is a component body of the Natural Tel 0131 667 1000 Fax 0131 668 2683 Environment Research Council. email [email protected] Natural History Museum, Cromwell Road, London SW7 5BD Tel 020 7589 4090 Fax 020 7584 8270 Tel 020 7942 5344/45 email [email protected] Columbus House, Greenmeadow Springs, Tongwynlais, Cardiff CF15 7NE Tel 029 2052 1962 Fax 029 2052 1963 Maclean Building, Crowmarsh Gifford, Wallingford OX10 8BB Tel 01491 838800 Fax 01491 692345 Geological Survey of Northern Ireland, Department of Enterprise, Trade & Investment, Dundonald House, Upper Newtownards Road, Ballymiscaw, Belfast, BT4 3SB Tel 028 9038 8462 Fax 028 9038 8461 www.bgs.ac.uk/gsni/ Parent Body Natural Environment Research Council, Polaris House, North Star Avenue, Swindon SN2 1EU Tel 01793 411500 Fax 01793 411501 www.nerc.ac.uk Website www.bgs.ac.uk Shop online at www.geologyshop.com OR/15/073 Contents Contents…………………………………………………………………………………………………....2 Summary…………………………………………………………………………………………………...3 1 Modelled Volume, Purpose and Scale .................................................................................. 4 2 Modelled Surfaces/Volumes .................................................................................................. 5 3 Modelled Faults ...................................................................................................................... 7 4 Model Workflow .................................................................................................................... 8 5 Model Datasets ....................................................................................................................... 9 5.1 GVS and GLEG Files ....................................................................................................... 9 5.2 Geological Linework ........................................................................................................ 9 5.3 Digital Terrain Model ..................................................................................................... 10 5.4 Borehole Data ................................................................................................................. 11 5.5 Other Datasets................................................................................................................. 12 6 Model Development Log ...................................................................................................... 12 7 Model Assumptions, Geological Rules Used etc. ............................................................... 12 8 Model Limitations ................................................................................................................ 14 8.1 Model Specific Limitations ............................................................................................ 14 8.2 General Modelling Limitations ...................................................................................... 15 9 Model QA .............................................................................................................................. 16 10 Model Images .................................................................................................................... 17 11 References ......................................................................................................................... 22 FIGURES Figure 1. Location of the Area 7 model outlined in black, proposed HS2 route shown in red. BGS 1:10,00 scale map sheet areas are shown in black, 1:50,000 scale in blue. ..................... 5 Figure 2. Area 7 project area outlined in green with revised geological fault network shown in red. Faults within the project area are represented in the model .............................................. 8 Figure 3 Plot of revised 1:10,000 scale maps used in the model. Area 7 model area outlined in blue, map sheets shown with red cross-hatching .................................................................... 10 Figure 4. Left: Plot of all boreholes within the Area 7 model area. Coded boreholes with drilled depths of 10 m and over are coloured green, under 10 m in black. Red boreholes are not coded. Right: Plot of boreholes used (red dots) in the 39 cross-sections (blue lines) constructed to constrain the model. Model area outlined in black ......................................... 11 Figure 5. Example of development log text .................................................................................. 12 Figure 6 Modelled distribution of first order river terrace deposits (orange) beneath alluvium (pale yellow). Orange areas indicate where alluvium and first order river terrace deposits are present in the model. Areas of sand and gravel extraction can also be seen. ......................... 13 2 OR/15/073 Figure 7. Extension of GLLMP1-XCZ beneath GFDMP-XSVin the middle of the model area around Coleshill ...................................................................................................................... 14 Figure 8. 3D view of all Area 7 cross sections from the south east (vertical exaggeration x10). Key as Table 1. ....................................................................................................................... 17 Figure 9. 3D view of all superficial deposits in Area 7. Alluvium is coloured yellow, river terrace deposits are pale orange, till is blue, glacial gravels are coloured pink. White areas indicate bedrock at surface. Key as Table 1. ........................................................................................ 18 Figure 10. 3D view of all artificial deposits (grey) in Area 7 with ALV (yellow) and RTD 1 (pale orange). This shows the extent of floodplain sand and gravel workings in the area. Key as Table 1. ................................................................................................................................... 19 Figure 11. 3D view of the modelled Permo-Triassic formations volumes, from the south-west. Vertical exaggeration x10. Key as Table 1............................................................................. 20 Figure 12. 3D ‘exploded’ view of the Carboniferous units in Area 7 from the west (vertical exaggeration x10) ................................................................................................................... 20 Figure 13. 3D ‘exploded’ view of the Cambrian units in Area 7, viewed from the west (vertical exaggeration x10). Key as Table 1. ........................................................................................ 21 TABLES Table 1. Units modelled in Area 7 .................................................................................................. 5 Summary This report describes the 3D geological model of HS2 (High Speed 2 rail link) Area 7 (Hampton in Arden to Drayton Bassett), created by Keith Ambrose with support from Steve Thorpe and borehole