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Papers by S.h.l.l. Gruijters

Research paper thumbnail of Clay resources in the Netherlands

Netherlands Journal of Geosciences - Geologie en Mijnbouw, Jul 1, 2007

Research paper thumbnail of Kartering tussenzandlaag in het Holoceen binnen het beheersgebied van het hoogheemraadschap Delfland

Research paper thumbnail of 3D-shallow subsurface characterisation, modelling and visualisation for the construction of a Radial Collector Well at Macharen, southern Netherlands

Research paper thumbnail of 3D geology in a 2D country: perspectives for geological surveying in the Netherlands

ABSTRACT Over the last ten to twenty years, geological surveys all over the world have been entan... more ABSTRACT Over the last ten to twenty years, geological surveys all over the world have been entangled in a process of digitisation. Their paper archives, built over many decades, have largely been replaced by electronic databases. The systematic production of geological map sheets is being replaced by 3D subsurface modelling, the results of which are distributed electronically. In the Netherlands, this transition is both being accelerated and concluded by a new law that will govern management and utilisation of subsurface information. Under this law, the Geological Survey of the Netherlands has been commissioned to build a key register for the subsurface: a single national database for subsurface data and information, which Dutch government bodies are obliged to use when making policies or decisions that pertain to, or can be affected by the subsurface. This requires the Survey to rethink and redesign a substantial part of its operation: from data acquisition and interpretation to delivery. It has also helped shape our view on geological surveying in the future. The key register, which is expected to start becoming operational in 2015, will contain vast quantities of subsurface data, as well as their interpretation into 3D models. The obligatory consultation of the register will raise user expectations of the reliability of all information it contains, and requires a strong focus on confidence issues. Building the necessary systems and meeting quality requirements is our biggest challenge in the upcoming years. The next step change will be towards building 4D models, which represent not only geological conditions in space, but also processes in time such as subsidence, anthropogenic effects, and those associated with global change.

Research paper thumbnail of 3D interpolation of grain size distributions in the upper 5m of the channel bed of three lower Rhine distributaries

Physics and Chemistry of the Earth, Parts A/B/C, 2005

Research paper thumbnail of Regional Sediment Deficits in the Dutch Lowlands: Implications for Long-Term Land-Use Options (8 pp)

Journal of Soils and Sediments, 2007

Research paper thumbnail of Silica sand resources in the Netherlands

Geologie en Mijnbouw

Silica sand, (almost) pure quartz sand, is a valuable and scarce mineral resource within the shal... more Silica sand, (almost) pure quartz sand, is a valuable and scarce mineral resource within the shallow Dutch subsurface. High-grade deposits are exploited in the southeasternmost part of the country, as raw material for the glass, ceramic, chemical and other process industries. Dutch land-use policy requires that scarce mineral resources (including silica sand) are taken into consideration in spatial planning and when preparing for large-scale engineering or construction works. For this purpose, and in order to review the long-term possibilities for home production of silica sand, we determined resource potential nationally. Our approach was (1) to establish the relevant conditions and processes associated with the deposition of the currently exploited sands, (2) identify lithostratigraphic units that are genetically similar or are otherwise known to contain quartz-rich sands, and (3) query the Dutch geological survey's borehole database for potential silica sand occurrences withi...

Research paper thumbnail of Clay resources in the Netherlands

Netherlands Journal of Geosciences - Geologie en Mijnbouw, Jul 1, 2007

Research paper thumbnail of Kartering tussenzandlaag in het Holoceen binnen het beheersgebied van het hoogheemraadschap Delfland

Research paper thumbnail of 3D-shallow subsurface characterisation, modelling and visualisation for the construction of a Radial Collector Well at Macharen, southern Netherlands

Research paper thumbnail of 3D geology in a 2D country: perspectives for geological surveying in the Netherlands

ABSTRACT Over the last ten to twenty years, geological surveys all over the world have been entan... more ABSTRACT Over the last ten to twenty years, geological surveys all over the world have been entangled in a process of digitisation. Their paper archives, built over many decades, have largely been replaced by electronic databases. The systematic production of geological map sheets is being replaced by 3D subsurface modelling, the results of which are distributed electronically. In the Netherlands, this transition is both being accelerated and concluded by a new law that will govern management and utilisation of subsurface information. Under this law, the Geological Survey of the Netherlands has been commissioned to build a key register for the subsurface: a single national database for subsurface data and information, which Dutch government bodies are obliged to use when making policies or decisions that pertain to, or can be affected by the subsurface. This requires the Survey to rethink and redesign a substantial part of its operation: from data acquisition and interpretation to delivery. It has also helped shape our view on geological surveying in the future. The key register, which is expected to start becoming operational in 2015, will contain vast quantities of subsurface data, as well as their interpretation into 3D models. The obligatory consultation of the register will raise user expectations of the reliability of all information it contains, and requires a strong focus on confidence issues. Building the necessary systems and meeting quality requirements is our biggest challenge in the upcoming years. The next step change will be towards building 4D models, which represent not only geological conditions in space, but also processes in time such as subsidence, anthropogenic effects, and those associated with global change.

Research paper thumbnail of 3D interpolation of grain size distributions in the upper 5m of the channel bed of three lower Rhine distributaries

Physics and Chemistry of the Earth, Parts A/B/C, 2005

Research paper thumbnail of Regional Sediment Deficits in the Dutch Lowlands: Implications for Long-Term Land-Use Options (8 pp)

Journal of Soils and Sediments, 2007

Research paper thumbnail of Silica sand resources in the Netherlands

Geologie en Mijnbouw

Silica sand, (almost) pure quartz sand, is a valuable and scarce mineral resource within the shal... more Silica sand, (almost) pure quartz sand, is a valuable and scarce mineral resource within the shallow Dutch subsurface. High-grade deposits are exploited in the southeasternmost part of the country, as raw material for the glass, ceramic, chemical and other process industries. Dutch land-use policy requires that scarce mineral resources (including silica sand) are taken into consideration in spatial planning and when preparing for large-scale engineering or construction works. For this purpose, and in order to review the long-term possibilities for home production of silica sand, we determined resource potential nationally. Our approach was (1) to establish the relevant conditions and processes associated with the deposition of the currently exploited sands, (2) identify lithostratigraphic units that are genetically similar or are otherwise known to contain quartz-rich sands, and (3) query the Dutch geological survey's borehole database for potential silica sand occurrences withi...