DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen
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The document discusses subsurface modeling conducted on Jurong Island, Singapore, detailing methodologies and tools used, such as the IMOD software. It highlights the data sources, including 509 boreholes, and the creation of 3D models to visualize subsurface layers, facilitating better understanding of geological structures. The advantages of the IMOD solid tool are also emphasized, including accessibility, resolution generation, and compatibility with other software.
DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen
- 1. Subsurface Modelling in iMOD Jurong Island - Singapore iMOD International Users Days Delft International Software Days Delft, 2nd of November 2016 Peter Vermeulen, Deltares
- 2. Project team Public Utilities Board, Singapore’s National Water Agency: PUB National University of Singapore: NUS Delta Research The Netherlands: DELTARES Project Initiator
- 3. Location: Singapore – Jurong Island • Surface area: 716 km2; Population: 5,5 million; Annual rainfall: ≈ 2,3 meter ! Jurong Island
- 4. Location: Jurong Island 1973 1989 2009 9 km 8.5 km
- 5. Historical Maps Subsurface Modelling – Sources HardrockSilt Clay Wet-East transects Before 1980 After 2002 HardrockSilt Clay Coral Landfill (sand) 0.0 Sea Coral
- 6. Subsurface Modelling - Sources Bathymetry is a combination of: • the seabed levels measured in 2002 using the Water Alliance data bank; • Seabed level on the 1992 topographic map of Jurong Island (source: Map resource library, Geography Department of NUS).
- 7. 509 boreholes were converted from PDF to IPF, the format that iMOD can read Boreholes were provided by JTC (Jurong Town Corporation) Subsurface Modelling - Sources
- 8. SOLID Tool functionalities Input sources: • Cross-sections (e.g. with seismic/geologic images); • Polygons with extent of interpolation; • Masks to define extent of thickness between overlying interfaces; • Faults for sharp discontinuities of interfaces; • Points with depth of interfaces; • Kriging settings per interface. Output: • IPF points for export to e.g. Surfer, GIS; • IDF files for each interface that are consistent with depth Subsurface Modelling – SOLID Tool
- 9. Landfill Coral SiltClay Jurong Formation Old Island Subsurface Modelling – Cross-sections Individual points along cross-section are used in interpolation. Interfaces can be deactivated if no points on that particular interface can be identified. With 26 cross-section the subsoil has been constructed in 4 separate layers with 5 interfaces
- 10. Subsurface Modelling – Masks Interface 1 DTM / Bathymetry Interface 2 Landfill; 5 Silt Interface 3 Coral Interface 4 Clay
- 11. Subsurface Modelling – Kriging Settings Do not interpolate interface 1 Apply consistency adjustments
- 12. Clay layer Land Fill Coral Silt layer Surface layer Jurong Formation Subsurface Modelling - Results
- 13. Subsurface Modelling – Results 3-D images of cross-sections, in combination with results of the SOLID Layers stacked
- 14. 3-D print of the Subsoil of Jurong Island Subsurface Modelling – Results
- 15. iMOD Solid Tool – advantages: • Multiply User access during construction; • Ability to generate realizations for different resolutions; • Export to other packages e.g. Surfer, GIS; • Display of images on cross-sections and 3-D visuals. Subsurface Modelling – Results