DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen
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Transcript of DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen
Subsurface Modelling in iMODJurong Island - SingaporeiMOD International Users DaysDelft International Software DaysDelft, 2nd of November 2016
Peter Vermeulen, Deltares
Project team
Public Utilities Board, Singapore’s National Water Agency: PUB
National University of Singapore: NUS
Delta Research The Netherlands: DELTARES
Project Initiator
Location: Singapore – Jurong Island
• Surface area: 716 km2; Population: 5,5 million; Annual rainfall: ≈ 2,3 meter !
Jurong Island
Location: Jurong Island
1973 1989 2009
9 km
8.5 km
HistoricalMaps
Subsurface Modelling – Sources
HardrockSilt Clay
Wet-East transects
Before 1980 After 2002
HardrockSilt Clay
Coral Landfill (sand)
0.0
Sea
Coral
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).
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
SOLID Tool functionalitiesInput 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
Landfill
Coral
SiltClay
Jurong Formation
Old IslandSubsurface 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
Subsurface Modelling – Masks
Interface 1 DTM / Bathymetry
Interface 2 Landfill; 5 Silt
Interface 3 Coral
Interface 4 Clay
Subsurface Modelling – Kriging Settings
Do not interpolate interface 1Apply consistency adjustments
Clay layer
Land Fill Coral
Silt layer
Surface layer
Jurong Formation
Subsurface Modelling - Results
Subsurface Modelling – Results
3-D images of cross-sections, in combination with results of the SOLID
Layers stacked
3-D print of the Subsoil of Jurong Island
Subsurface Modelling – Results
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