Metadata Report for the Cardiff Superficial Deposits 3D Geological Model
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Metadata report for the Cardiff superficial deposits 3D geological model Minerals and Waste Programme Open Report OR/16/031 BRITISH GEOLOGICAL SURVEY MINERALS AND WASTE PROGRAMME OPEN REPORT OR/16/031 Model metadata report for Cardiff The National Grid and other Ordnance Survey data © Crown Superficial Deposits Copyright and database rights 2020. Ordnance Survey Licence No. 100021290 EUL. Kendall, R. S., Williams, L. R., Patton, A. M., Thorpe, S. Keywords Cardiff, superficial deposits, GSI3D, geological model Editor National Grid Reference Burke, H. F. SW corner 310500,170000 NE corner 326250,185000 Map Sheet 263, 1:50 000 scale, Cardiff Front cover Exploded view of Cardiff superficial deposits model, looking from the south. Bibliographical reference KENDALL, R. S., WILLIAMS, L. R., PATTON, A. M., THORPE, S. 2020. Metadata report for the Cardiff superficial deposits 3D geological model. British Geological Survey Open Report, OR/16/031. 19pp. Copyright in materials derived from the British Geological Survey’s work is owned by UK Research and Innovation (UKRI) 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. © UKRI 2020. All rights reserved Keyworth, Nottingham British Geological Survey 2020 BRITISH GEOLOGICAL SURVEY The full range of our publications is available from BGS British Geological Survey offices shops at Nottingham, Edinburgh, London and Cardiff (Welsh publications only) see contact details below or shop online at Environmental Science Centre, Keyworth, Nottingham www.geologyshop.com NG12 5GG The London Information Office also maintains a reference Tel 0115 936 3100 collection of BGS publications, including maps, for consultation. BGS Central Enquiries Desk We publish an annual catalogue of our maps and other publications; this catalogue is available online or from any of the BGS shops. Tel 0115 936 3143 email [email protected] The British Geological Survey carries out the geological survey of Great Britain and Northern Ireland (the latter as an agency service BGS Sales for the government of Northern Ireland), and of the surrounding continental shelf, as well as basic research projects. It also Tel 0115 936 3241 undertakes programmes of technical aid in geology in developing email [email protected] countries. The Lyell Centre, Research Avenue South, Edinburgh The British Geological Survey is a component body of UK Research EH14 4AP and Innovation. Tel 0131 667 1000 email [email protected] Natural History Museum, Cromwell Road, London SW7 5BD Tel 020 7589 4090 Tel 020 7942 5344/45 email [email protected] Cardiff University, Main Building, Park Place, Cardiff CF10 3AT Tel 029 2167 4280 Maclean Building, Crowmarsh Gifford, Wallingford OX10 8BB Tel 01491 838800 Geological Survey of Northern Ireland, Department of Enterprise, Trade & Investment, Dundonald House, Upper Newtownards Road, Ballymiscaw, Belfast, BT4 3SB Tel 01232 666595 www.bgs.ac.uk/gsni/ Natural Environment Research Council, Polaris House, North Star Avenue, Swindon SN2 1EU Tel 01793 411500 Fax 01793 411501 www.nerc.ac.uk UK Research and Innovation, Polaris House, Swindon SN2 1FL Tel 01793 444000 www.ukri.org Website www.bgs.ac.uk Shop online at www.geologyshop.com Acknowledgements A number of individuals have contributed to the project. This assistance has been received at all stages of the study. Of the many individuals who have contributed to the project we would particularly like to thank the following: RA Waters, DI Schofield, Helen Burke and David Boon. Contents Acknowledgements ........................................................................................................................ 1 Contents .......................................................................................................................................... 1 Summary ........................................................................................................................................ 3 1 Modelled volume, purpose and scale .................................................................................... 3 1.1 Project Area .................................................................................................................... 3 2 Modelled surfaces/volumes .................................................................................................... 4 2.1 Brief overview of superficial geology ............................................................................ 4 2.2 Lithological description of superficial deposits in the Cardiff District .......................... 5 2.3 Modelled units ................................................................................................................ 5 3 Model datasets ........................................................................................................................ 7 3.1 Digital Terrain Model ..................................................................................................... 7 3.2 Borehole data .................................................................................................................. 7 3.3 Geological Map data ....................................................................................................... 9 4 Model workflow .......................................................................................................................... 9 5 Model assumptions, geological rules used etc. ................................................................... 10 6 Model limitations .................................................................................................................. 10 7 Model QA .............................................................................................................................. 12 8 Model images ........................................................................................................................ 13 References .................................................................................................................................... 15 FIGURES Figure 1 Extent of the InnovateUK, technical feasibility study area (black and red polygons combined). Groundwater monitoring boreholes are shown in yellow. Contains Ordnance Survey data © Crown Copyright and database rights 2020. Ordnance Survey Licence no. 100021290 ................................................................................................................................ 4 Figure 2 Modelling areas assigned to individual geologists. Contains NEXTMap Britain elevation data from Intermap Technologies and Ordnance Survey data © Crown Copyright and database rights 2020. Ordnance Survey Licence no. 100021290 ...................................... 8 1 Figure 3 Distribution of cross-section lines (dark red) and the boreholes (yellow) used in the construction of the model. Contains Ordnance Survey data © Crown Copyright and database rights 2020. Ordnance Survey Licence no. 100021290 .......................................................... 10 Figure 4 Cross-section Cardiff_Helper_LRWI_2, which runs W-E across the River Taff. Alluvium is modelled to fit the DTM and climbs up the eastern side of the valley. 4A – cross section and 4B illustrates its position within the city of Cardiff. Contains Ordnance Survey data © Crown Copyright and database rights 2020. Ordnance Survey Licence no. 100021290 .............................................................................................................................. 11 Figure 5 View of the model looking across the harbour to the north showing all modelled superficial deposit units (5 times vertical exaggeration; made ground not shown). Key as per Table 1. ................................................................................................................................... 13 Figure 6 View of the exploded modelled superficial deposit units, viewed from the southwest corner looking eastwards. Key as per Table 1. ....................................................................... 14 Figure 7 Figure 7 View of all cross-sections in 3D, looking across the harbour to the north. Key as per Table 1. ......................................................................................................................... 14 TABLES Table 1 List of Superficial Deposits considered in the creation of the model ................................ 6 Table 2 Ordnance Survey Open Data themes that define the extent of made ground in the model and the buffer distance used ..................................................................................................... 7 2 Summary The objective of this work was to assemble a geological framework model and calculated surfaces for the superficial deposits for the city of Cardiff. The model has a number of purposes: To investigate the superficial deposits within the city of Cardiff and surrounding area. To provide a communication tool to present the geological understanding of the superficial deposits of the area. To provide information on the subsurface distribution and thickness of the main superficial deposits (principally Till, Glaciofluvial Deposits,