DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen

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Subsurface Modelling in iMOD Jurong Island - Singapore iMOD International Users Days Delft International Software Days Delft, 2 nd of November 2016 Peter Vermeulen, Deltares

Transcript of DSD-INT 2016 Subsurface modelling in iMOD - Jurong Island, Singapore - Vermeulen

Page 1: 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

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Project team

Public Utilities Board, Singapore’s National Water Agency: PUB

National University of Singapore: NUS

Delta Research The Netherlands: DELTARES

Project Initiator

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Location: Singapore – Jurong Island

• Surface area: 716 km2; Population: 5,5 million; Annual rainfall: ≈ 2,3 meter !

Jurong Island

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Location: Jurong Island

1973 1989 2009

9 km

8.5 km

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HistoricalMaps

Subsurface Modelling – Sources

HardrockSilt Clay

Wet-East transects

Before 1980 After 2002

HardrockSilt Clay

Coral Landfill (sand)

0.0

Sea

Coral

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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).

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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

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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

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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

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Subsurface Modelling – Masks

Interface 1 DTM / Bathymetry

Interface 2 Landfill; 5 Silt

Interface 3 Coral

Interface 4 Clay

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Subsurface Modelling – Kriging Settings

Do not interpolate interface 1Apply consistency adjustments

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Clay layer

Land Fill Coral

Silt layer

Surface layer

Jurong Formation

Subsurface Modelling - Results

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Subsurface Modelling – Results

3-D images of cross-sections, in combination with results of the SOLID

Layers stacked

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3-D print of the Subsoil of Jurong Island

Subsurface Modelling – Results

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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