OR/13/050 Model limitations

Gow, H, Cripps, C, Thorpe, S, Horabin, C, and Lee, J R. 2013. Model metadata report for the Somerset levels 3D geological model. British Geological Survey Internal Report, OR/13/050.

• This model is a rapid-response, low-resolution model aimed at providing a basic geological framework for the region and should not be used for detailed analysis of the surface or sub-surface. As such, the built model only reflects the generalised complexity and geometry of the superficial and bedrock geology of the area.
• The GSI3D modelling software relies on a generalised vertical section (GVS) to define the sequence of units. The sporadic distribution and interdigitation of peats within the tidal flat deposits meant that this stratigraphical sequencing would not function with the limitations of the GVS. Because of this the tidal flat deposits had to be sub-divided to allow the peat units to be correlated.
• Since modelling commenced in 2009, additional boreholes, improved elevation data and relevant literature have been identified although not incorporated into this revised model. Adding this data to the model would greatly improve its resolution and quality. Due to time constraints it has not been possible to implement this into the 2014 revision. In the future this should be a priority should a higher resolution model be required.
• Due to the shallow and thin nature of the superficial deposits in this area, the calculation of the model could be improved by constructing further cross sections.