OR/14/035 Model datasets

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THORPE, S, BURKE, H, WHITBREAD, K. 2013. Model metadata report for the EA Tees 3d Model. British Geological Survey Internal Report, OR/14/035.

The following primary datasets were used in the construction of the Teesside 3D model:

  • DTM — the BGS derived BaldEarth digital terrain model (DTM) was used as the capping surface and was resampled to give a cell resolution of 50 m
  • Rockhead model — this was extracted from the corporate rockhead model dataset (V5) at the start of the project (01/08/2012).
  • Borehole data — Boreholes were coded by H Burke and C Horabin using the BGS Superficial Deposits Coding Scheme (Cooper et al, 2005), and content code 'DU'. All coded boreholes were extracted from SOBI/BoGe using an access query to create BID/BLG files for import into GSI3D software. The Borehole Filter Tool was used to prioritise and deduplicate the borehole records using the following priority order:
Table 2 Borehole interpreter coding scheme used to prioritise the selection of borehole records for modelling.
1 CB best coding, full breakdown of lithologies in superficial and bedrock with some attempt at Lithostrat — good description text
2 WM good coding, full breakdown of lithologies in superficials and bedrock with some attempt at Lithostrat — good description text
3 DU Lithologies for superficials, not lithostrat. Some descriptions input, appears patchy
4 DV as above
5 G Midas coding. Lith and Strat coded. Good descriptions. Old coding system used
6 AR full lithological coding with some lithostrat for superficial attempted
7 GX Geotechnical Database Logs: interpretations copied from the National Geotechnical Database.
8 NR Good descriptions but uses the old style of coding lithologies and in places no entries are given for lith. No attempt at lithostrat made
9 LO No bedrock details (input as ROCK), but good lithological breakdown. No descriptions. No Lithostrat attempted
10 L little detail in coding, useful only for base of superficials
11 R no details of superficials


  • Map data — the surface distribution of the modelled lithostratigraphic units is based on the distribution of lithogenetic units depicted in DiGMap50. The model included the breakdown of the mapped Till unit into an upper (Horden Till) and lower (Blackhall Till) and this required some added delineation in 2D to enable these units to be drawn in cross-section.
  • Previous GSI3D models — this model is an extension of work in the Durham area to the north completed in 2007 by (Price et al. 2007[1]) and several sections from the earlier work were utilised in the construction of the Teesside model.
  • Other datasets — a shapefile outlining the known extent of moraines was created by A Cooper to provide a guide as to the extent of Till units, particularly the upper Till. A limit of laminated clay (also created by A Cooper) was used to guide the extent of sub-glacial clays.

Reference

  1. PRICE, S J, MERRITT, J E, WHITBREAD, K, LAWLEY, R S, BANKS, V, BURKE, H, IRVING, A M and COOPER, A H. 2007. Superficial Geology and Hydrogeological Domains between Durham and Darlington Phase 1 (Durham South). British Geological Survey Internal Report CR/07/002 (Commercial in Confidence)