De geologie en hydrogeologie van Twente

In opdracht van de Provincie Overijssel heeft TNO Geologische Dienst van Nederland een hydrogeologische overzichtskaart van de regio Twente opgesteld. De kaart bestaat uit twee kaartbladen, welke aspecten van de ondergrond tonen die van belang zijn voor de grondwaterstroming in dit gebied. Het gaat daarbij om de ondiepe grondwaterstroming. De...

A Late Glacial surface rupturing earthquake at the Peel Boundary fault zone, Roer Valley Rift System, the Netherlands

Paleoseismological trenching studies constrain recurrence times and magnitudes of faulting events and earthquakes on active faults. In a trench along the central part of the Peel Boundary fault zone (PBFZ), southeastern Netherlands, evidence was found for such a large faulting event that occurred around 14 ka. The event caused a fault scarp in...

Centennial-scale lake-level lowstand at Lake Uddelermeer (The Netherlands) indicates changes in moisture source region prior to the 2.8-kyr event

The Uddelermeer is a unique lake for The Netherlands, containing a sediment record that continuously registered environmental and climatic change from the late Pleistocene on to the present. A 15.6-m-long sediment record was retrieved from the deepest part of the sedimentary basin and an age–depth model was developed using radiocarbon dating,...

Reconstructing North Sea palaeolandscapes from 3D and high-density 2D seismic data: An overview

The North Sea subsurface shows the marks of long-term tectonic subsidence. Much of it contains a thick record of glacial and interglacial deposits and landscapes, formed during multiple glacial cycles and the associated regressions and transgressions during the past two million years. At times of lower sea level than today, areas that are...

3D geology in a 2D country: Perspectives for geological surveying in the Netherlands

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 Their paper archives, built over many decades, have largely been replaced by electronic databases.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...

Recent coastal dune development: Effects of sand nourishments

Much of the Dutch coast has been subject to structural erosion. From 1990 onward, sand nourishments have been used under a government policy of dynamic preservation. Annual monitoring and field inspections show that the structural erosion has decreased or even turned into coastal progradation after 1990. The monitoring data concern only...

Characterisation of landfills using a multidisciplinary approach

The Netherlands has about 3800 abandoned landfills with a total surface of about 9000 ha. As they are often located near urban areas and their influence extends into their surrounding environment they put pressure on available space. Most abandoned landfills were in use until the 1960s and 1970s. Their precise geometry and composition are often...

Geophysical investigation of a dutch levee and canal using various seismic and GPR techniques

A geophysical survey has been carried out on the Juliana Canal and levee in the south of the Netherlands. For a stretch of about 35 km along this canal various construction works are planned, to deepen and widen the canal. The canal is in a geological setting such that leakage from the canal to the surrounding landscape during the construction...

Using 18th century storm-surge data from the Dutch Coast to improve the confidence in flood-risk estimates

For the design of cost-effective coastal defence a precise estimate is needed of the 1/10 000 per year storm surge. A more precise estimate requires more observations. Therefore, the three greatest storm surges that hit the northern part of the Holland Coast in the 18th century are reconstructed. The reconstructions are based on paintings,...

Ground-penetrating radar profiling on embanked floodplains

Management of the Dutch embanked floodplains is of crucial interest in the light of a likely increase of extreme floods. One of the issues is a gradual decrease of floodwater accommodation space as a result of overbank deposition of mud and sand during floods. To address this issue, sediment deposits of an undisturbed embanked floodplain near...