document

Single-shot LIBS spectral quality for waste particles in open air

Xia, H. (author), Bakker, M.C.M. (author)

This work investigates the ability of LIBS to produce quality spectra from small particles of concrete demolition waste using single-shot spectra collected in open air. The 2–8?mm materials are rounded river gravel, green glass shards, and plastic flakes. Considered are focal length, air, moisture, laser energy, and laser incidence angle (LIA)....

journal article 2015

document

Quantification of the influence of preferential flow on slope stability using a numerical modelling approach

Shao, W. (author), Bogaard, T.A. (author), Bakker, M. (author), Greco, R. (author)

The effect of preferential flow on the stability of landslides is studied through numerical simulation of two types of rainfall events on a hypothetical hillslope. A model is developed that consists of two parts. The first part is a model for combined saturated/unsaturated subsurface flow and is used to compute the spatial and temporal water...

journal article 2015

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An active heat tracer experiment to determine groundwater velocities using fiber optic cables installed with direct push equipment

Bakker, M. (author), Caljé, R. (author), Schaars, F. (author), Van der Made, K.J. (author), De Haas, S. (author)

A new approach is developed to insert fiber optic cables vertically into the ground with direct push equipment. Groundwater temperatures may be measured along the cables with high spatial and temporal resolution using a Distributed Temperature Sensing system. The cables may be inserted up to depths of tens of meters in unconsolidated sedimentary...

journal article 2015

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Analysing the influence of preferential flow on pressure transmission and landslide triggering

Shao, W. (author), Bogaard, T.A. (author), Bakker, M. (author), Su, Y. (author), Berti, M. (author)

journal article 2015

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Can flow velocity distribution at a pore-scale be quantified by a celerity-saturation curve?

Shao, W. (author), Su, Y. (author), Bogaard, T.A. (author), Bakker, M. (author), Savenije, H.H.G. (author)

journal article 2015

document

Occurrence of seawater intrusion overshoot

Morgan, L.K. (author), Bakker, M. (author), Werner, A.D. (author)

A number of numerical modeling studies of transient sea level rise (SLR) and seawater intrusion (SI) in flux-controlled aquifer systems have reported an overshoot phenomenon, whereby the freshwater-saltwater interface temporarily extends further inland than the eventual steady state position. Recently, physical sand-tank modeling has shown...

journal article 2015

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Quality of open air, single-shot laser-induced breakdown spectroscopy (LIBS) spectra from waste particles

Xia, H. (author), Bakker, M.C.M. (author)

conference paper 2015

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Science Perspective on Plastics Recycling and Reuse

Bakker, M.C.M. (author)

lecture notes 2015

document

Op weg naar een circulaire economie

Bakker, M.C.M. (author)

lecture notes 2015

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Quantification of the influence of preferential flow on slope stability using a numerical modeling approach (discussions)

Shao, W. (author), Bogaard, T.A. (author), Bakker, M. (author), Greco, R. (author)

The effect of preferential flow on the stability of landslides is studied through numerical simulation of two types of rainfall events on a hypothetical hillslope. A model is developed that consists of two parts. The first part is a model for combined saturated/unsaturated subsurface flow and is used to compute the spatial and temporal water...

journal article 2014

document

Optimised control and pipe burst detection by water demand forecasting

Bakker, M. (author)

Water demand forecasting The total water demand in an area is the sum of the water demands of all individual domestic and industrial consumers in that area. These consumers behave in repetitive daily, weekly and annual patterns, and the same repetitive patterns can be observed in the drinking water demand. The observations of the water demand...

doctoral thesis 2014

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Exact versus Dupuit interface flow in anisotropic coastal aquifers

Bakker, M. (author)

The Dupuit solution for interface flow toward the coast in a confined aquifer is compared to a new exact solution, which is obtained with the Hodograph method and conformal mapping. The position of the toe of the interface is a function of two dimensionless parameters: the ratio of the hydraulic gradient upstream of the interface where flow is...

journal article 2014

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LIBS inspection and particle segregation in the transport of recycled concrete waste

Xia, H. (author), Bakker, M.C.M. (author)

conference paper 2014

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Recycling end-of-life concrete: The C2CA project

Di Maio, F. (author), Lotfi, S. (author), Rem, P.C. (author), Bakker, M. (author), Hu, M. (author)

lecture notes 2014

document

Advanced control of a water supply system: A case study

Bakker, M. (author), Rajewicz, T. (author), Kien, H. (author), Vreeburg, J.H.G. (author), Rietveld, L.C. (author)

Conventional automatic production flow control and pump pressure control of water supply systems are robust and simple: production flow is controlled based on the level in the clear water reservoir and pump pressure is controlled on a static set-point. Recently, more advanced computer-based control methods were developed in which production flow...

journal article 2014

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How to Use COMSOL Multiphysics for coupled dual-permeability hydrological and slope stability modeling

Shao, W. (author), Bogaard, T.A. (author), Bakker, M. (author)

Preferential flow paths, such as cracks, macropores, fissures, pipes etc. are common features of highly heterogeneous slopes. During intense rainstorms, preferential flow has a significant influence on subsurface flow and slope stability. Dual-permeability models are widely used to simulate preferential flow, but have not been incorporated into...

journal article 2014

document

"Groundwater recharge: Processes and quantification": Preface

Bakker, M. (author), Bartholomeus, R.P. (author), Ferré, T.P.A. (author)

journal article 2013

document

A method of separating scrap, and a device

Bakker, M.C.M. (author), Rem, P.C. (author), Berkhout, S.P.M. (author)

The invention relates to a method of and a device for separating scrap comprising scrap items of a first type and of a second type, at least one of said types of scrap comprising metal. According to the invention, the method comprises the steps of passing a spot of light over the surface of a scrap item, and performing a plurality of successive...

patent 2013

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Reliability of quay walls using finite element analysiscalibration of partial safety factors in quay wall design by probabilistic plaxis calculations

Wolters, H.J. (author), Bakker, K.J. (author), De Gijt, J.G. (author)

During the last two years, CUR committee 183 has worked on the upgrade of the Dutch Quay Walls handbook (CUR 211), which is to be published in 2013. Two of the main elements that are considered in this new edition are the addition of Finite Element analysis (FEM) as a method for design, comparable to the description in the Handbook Sheet-Pile...

conference paper 2013

document

Characterization of groundwater dynamics in landslides in varved clays

Van der Spek, J.E. (author), Bogaard, T.A. (author), Bakker, M. (author)

Groundwater dynamics may play a significant role in landslides. A detailed model is developed of the groundwater dynamics in landslides in varved clays in the Trieves area in the French Alps. The varved clays consist of a sequence of alternating silt and clay layers, covered by a colluvium layer and intersected by fissures. The hydraulic...

journal article 2013