document

Characterization and modelling of full-scale aerobic granular sludge

van den Berg, L. (author)

Existing mathematical models for aerobic granular sludge have focused solely on lab-scale reactors. In this study, an effort was made to adapt these models to simulate the processes of full-scale installations. The model is the first aerobic granular sludge model to use transient radial diffusion and multiple granule fractions. Aerobic and...

master thesis 2017

document

Long Span Buoyancy Bridge with Submerged Cable Anchoring

Yip, T. (author)

The purpose of this MSc thesis is to find a feasible concept for a circa 4500 m long buoyancy bridge, which is located at the Sognefjord in Norway. The concept should be structurally and aesthetically competitive. In contrast to bridges on shore with fixed supports, a buoyancy bridge is supported on floating pontoons. As result, loads will cause...

master thesis 2015

document

Studying CO2 storage with ambient-noise seismic interferometry: A combined numerical feasibility study and field-data example for Ketzin, Germany

Boullenger, B. (author), Verdel, A. (author), Paap, B. (author), Thorbecke, J.W. (author), Draganov, D.S. (author)

Seismic interferometry applied to ambient-noise measurements allows the retrieval of the seismic response between pairs of receivers. We studied ambient-noise seismic interferometry (ANSI) to retrieve time-lapse reflection responses from a reservoir during CO2 geologic sequestration, using the case of the experimental site of Ketzin, Germany. We...

journal article 2015

document

Modeling estuarine morphodynamics under combined river and tidal forcing

Guo, L.C. (author)

Estuarine morphodynamics are of broad importance to estuaries’ functions related to navigation, human settlement and ecosystems. Inspired by the Yangtze River estuary (YRE), this study aims to explore the impact of river discharge, tides and their interaction on long-term estuarine morphodynamics. Use is made of 1D and 2D process-based models....

doctoral thesis 2014

document

The electromagnetic response in a layered vertical transverse isotropic medium: A new look at an old problem

Hunziker, J.W. (author), Thorbecke, J.W. (author), Slob, E.C. (author)

We determined that the electromagnetic vertical transverse isotropic response in a layered earth can be obtained by solving two equivalent scalar equations, which were for the vertical electric field and for the vertical magnetic field, involving only a scalar global reflection coefficient. Besides the complete derivation of the full...

journal article 2014

document

Passenger Transfer Chain Analysis for Reallocation of Heritage Space at Amsterdam Central Station

Starmans, M. (author), Verhoeff, L. (author), Van den Heuvel, J.P.A. (author)

Amsterdam Central Station is the second busiest station in The Netherlands. Several bottlenecks in the 125 years old monumental station exist due to present train and pedestrian volumes. Further traffic growth is expected. To understand and quantify the options for redesign, a thorough understanding of the interaction between the core traffic...

journal article 2014

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An approximate 3D computational method for real-time computation of induction logging responses

Bensdorp, S. (author), Petersen, S.A. (author), Van den Berg, P.M. (author), Fokkema, J.T. (author)

Over many years, induction logging systems have been used to create well formation logs. The major drawback for the utilization of these tools is the long simulation time for a single forward computation. We proposed an efficient computational method based on a contrast-type of integral-equation formulation, in which we applied an approximation...

journal article 2014

document

Enhancing Land Controlled-Source Electromagnetic Surveys using Vertical Electric Field Measurements

Brackenhoff, J.A. (author)

Nowadays, marine Controlled Source ElectroMagnetic surveys are commonly used for oil exploration whereas similar surveys on land are still a rarity. In recent years theoretical studies have shown that using a horizontal source and vertical receivers on land will result in lower noise levels measured by the receivers. In order to test this, a...

bachelor thesis 2014

document

The Design of A Synchromodal Freight Transport System

Fan, Y. (author)

In the current situation, although there are advantages of intermodal freight transport, the performance of intermodal freight transport (IFT) is not good. The market share of IFT is low compared with single-mode road transport. It is necessary to analyze the current operation of IFT system and apply the concept of synchromodal transport to...

master thesis 2013

document

Validation of an electroseismic and seismoelectric modeling code, for layered earth models, by the explicit homogeneous space solutions

Grobbe, N. (author), Slob, E.C. (author)

We have developed an analytically based, energy fluxnormalized numerical modeling code (ESSEMOD), capable of modeling the wave propagation of all existing ElectroSeismic and SeismoElectric source-receiver combinations in horizontally layered configurations. We compare the results of several of these modeled source-receiver combinations in a...

journal article 2013

document

Tyre - Road Noise, Surface Characteristics and Material Properties

Li, M. (author)

Noise levels due to road traffic have reached intolerable high levels in and around many urban areas all around the world. Because of health reasons and reasons of well- being these noise levels have to be reduced. The noise produced from the interaction between the rolling tyre and road surface is one of the most important contributions in the...

doctoral thesis 2013

document

Morphological modelling of strongly curved islands

Roelvink, D. (author), Den Heijer, C. (author), Van Thiel De Vries, J.S.M. (author)

Land reclamations and island coasts often involve strongly curved shorelines, which are challenging to be properly modeled by numerical morphological models. Evaluation of the long term development of these types of coasts as well as their response to storm conditions requires proper representation of the governing physical processes. Not all...

conference paper 2013

document

A compressive strength model for recycled aggregate systems

Koenders, E.A.B. (author), Pepe, M. (author), Caggiano, A. (author), Martinelli, E. (author), Toledo Filho, R.D. (author)

conference paper 2013

document

Local time stepping with the discontinuous Galerkin method for wave propagation in 3D heterogeneous media

Minisini, S. (author), Zhebel, E. (author), Kononov, A. (author), Mulder, W.A. (author)

Modeling and imaging techniques for geophysics are extremely demanding in terms of computational resources. Seismic data attempt to resolve smaller scales and deeper targets in increasingly more complex geologic settings. Finite elements enable accurate simulation of time-dependent wave propagation in heterogeneous media. They are more costly...

journal article 2013

document

A new optimization approach for source-encoding full-waveform inversion

Moghaddam, P.P. (author), Keers, H. (author), Herrmann, F.J. (author), Mulder, W.A. (author)

Waveform inversion is the method of choice for determining a highly heterogeneous subsurface structure. However, conventional waveform inversion requires that the wavefield for each source is computed separately. This makes it very expensive for realistic 3D seismic surveys. Source-encoding waveform inversion, in which the sources are modeled...

journal article 2013

document

Injectivity errors in foam EOR

Leeftink, T.N. (author)

Simulators play a crucial role in EOR reservoir modeling. One of the big problems with the simulation of gas injection in SAG foam processes, is that foam collapse near the injection well is poorly represented in the simulator well model. This paper focusses on the question whether a simulator using the Peaceman equation for a homogeneous...

bachelor thesis 2013

document

Observations and modeling of steep-beach grain-size variability

Reniers, A.J.H.M. (author), Gallagher, E.L. (author), MacMahan, J.H. (author), Brown, J.A. (author), Van Rooijen, A.A. (author), Van Thiel de Vries, J.S.M. (author), Van Prooijen, B.C. (author)

Novel observations of surface grain-size distributions are used in combination with intra-wave modeling to examine the processes responsible for the sorting of sediment grains on a relatively steep beach (slope?=?1:7.5). The field observations of the mean grain size collected with a digital camera system at consecutive low and high tides for a 2...

journal article 2013

document

The Variability of Traffic in Congestion Forecasting

Smid, R.M. (author)

Congestion on the Dutch motorway network is an actual problem, which originated over the past decades. Over the past few years, the extent of congestion is decreasing, though still very significant. Road authorities therefore show interest in traffic congestion forecasting. In this way they can inform road users or undertake other strategic...

master thesis 2012

document

Immiscible foam for enhancing oil recovery

Simjoo, M. (author)

Growing worldwide oil demand increased the need of new and efficient oil recovery methods. Gas injection in oil reservoirs is deemed one of the most widely used methods to increase oil recovery. However, the full potential of gas injection is often not realized due to poor vertical and areal sweep efficiency of the gas. Foaming could be a...

doctoral thesis 2012

document

Nongeometrically converted shear waves in marine streamer data

Drijkoningen, G.G. (author), El Allouche, N. (author), Thorbecke, J.W. (author), Bada, G. (author)

Under certain circumstances, marine streamer data contain nongeometrical shear body wave arrivals that can be used for imaging. These shear waves are generated via an evanescent compressional wave in the water and convert to propagating shear waves at the water bottom. They are called “nongeometrical” because the evanescent part in the water...

journal article 2012