OR/14/045 Model workflow
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| Price, S J, and Waters, C N. 2014. Model metadata report for Swansea-Neath-Port-Talbot. British Geological Survey Internal Report, OR/14/045. |
A GSI3D model workflow was followed. The geological model was constructed in 2002 before the introduction of formal GSI3D training courses and manuals. The workflow implemented the steps shown in Table 3. The 3D geological modelling workflow is described in more detail in Waters et al, 2005 [1].
Table 3 model workflow steps taken during creation of the Swansea-Neath-Port-Talbot 3D geological model Step Description 1 Borehole coding in to BGS’s Borehole Geology (BOGE) and Single Onshore Borehole Index (SOBI) tables. 2 Borehole selection using quarter sheets parameters SS69NE, SS69SE, SS79NW and SS79SW and geological interpreter code parameter DIS. Translation of lithological codes used in BOGE to be consistent with those specified by Cooper et al. (2006)[2]. Manual update of lithostratigraphical codes. Creation of GSI3D .bid and .blg files. 2009 boreholes available, 752 selected for consideration in the geological model. 3 Creation of DTM using Landform Profile 5 m contours and spot heights with 20 m cell size. 4 Use of digital geological rockhead model created for the Swansea-Neath-Port-Talbot area. Methodology described in (Waters et al., 2006[3]). 5 GIS selection of DiGMAPGB50 (2002) digital geological map data for project area. 6 Selection of cross-section lines based on borehole distribution and depth of drilling. Deepest boreholes prioritised. Cross-sections orientated north-west–south-east (generally perpendicular to the Swansea and Neath Valleys) and north-east–south-west (generally parallel to the long profile of the Swansea and Neath Valleys). 7 Creation of envelopes using DiGMapGB50 digital geological polygons. 8 Model calculation. 9 Model iteration including synthetic section drawing to check model calculation. 10 Model calculation. 11 GIS calculation of reduced DTMs to calculate geological models at specified intervals below ground level of 1, 5, 10, 15 and 20 m. 12 GIS calculation of DTM for Swansea Morfa area for visualisation and presentation.
References
- ↑ WATERS, C N, PRICE, S J, DAVIES, J, TYE, A M, BROWN, S E, and SCHOFIELD, D I. 2005. Urban geology of Swansea-Neath-Port-Talbot. 7–22 in Urban Geology in Wales. BASSETT, M G, DEISLER, V K, and NICHOL, D (editors). 2.
- ↑ COOPER, A H, KESSLER, H, and FORD, J R. 2006. A revised scheme for coding unlithified deposits (also applicable to engineering soils). British Geological Survey, Internal Report, IR/05/123.
- ↑ WATERS, C N, PRICE, S J, HAWKINS, M P, MARCHANT, A P, FIORINI, E, BROWN, S E, TYE, A M, FLEMING, C, DAVIES, J, SCHOFIELD, D I, BARCLAY, W J, and GARCIA-BAJO, M. 2006. A background to urban geoscience studies in the Swansea-Neath-Port-Talbot area. British Geological Survey, Internal Report, IR/05/073R (Keyworth, Nottingham).