Searched for: contributor%3A%22Slob%2C+E.C.+%28mentor%29%22
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FLOURI, ANNA (author)
The magnetic method is one of the geophysical techniques that prevails in the detection and identification of Uneploaded Ordnance (UXO). Inversion of the magnetic data, allows us to recover the position and the magnetic dipole moment of the object. The typical use of a model is a sphere, though it does not<br/>provide information about the shape...
master thesis 2021
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Van Ballaer, A. (author)
Geophysical monitoring is a popular tool in aquifer characterization and groundwater flow. To address this objective at groundwater extraction site ‘t Klooster, an ERT dataset was analyzed to identify groundwater flow patterns resulting from the injection of warm oxygenated water. Using a petrophysical model, changes in resistivity were...
master thesis 2020
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Buist, Jan Willem (author)
The hazards of unexploded ordnance threaten the increasing marine construction activities nowadays, which increases the importance of unexploded ordnance detection. Research has shown that transient electromagnetic methods can successfully be used to detect unexploded ordnance on land. New equipment is being developed to make marine unexploded...
master thesis 2020
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Tatar, Hamza (author)
Clay has been used for many hundreds of years in building dikes. Their physical properties and thickness are essential for a dike to maintain its function. For the last fifteen years electromagnetic induction instruments (EMI) have been playing a growing role in mapping electromagnetic soil properties. Layered models with sharp boundaries...
master thesis 2020
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van Kerkhoven, Lotte (author)
The aim of this study is to look into the effect of water content in clays on the electrical conductivity as obtained from measurements of an frequency domain electromagnetic induction survey and a laboratory resistivity test. The laboratory test results are compared to theoretical conductivity models. The focus is hereby on determining the...
bachelor thesis 2020
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Stolz, Tobias (author)
The position of installed submarine power cables is often not accurately known for several reasons. The precise knowledge of the cable position is important for the maintenance process and necessitates the need for cable tracking systems. Current systems are in many cases imprecise and have a short sensing distance, limited to a few meters. A...
master thesis 2019
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Mulder, Claire (author)
Forensic investigations focused on determining clandestine buried weapons, narcotics or even homicide evidence, can be expensive, inefficient and depend greatly on prior information and the tools available. Geophysical tools have potential to improve these investigations, on the ground that they can detect shallow buried objects in a non...
bachelor thesis 2019
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Gebraad, L. (author)
A MATLAB program was built around 1D closed form representations of the radial electrical field in a vertical transverse isotropic (VTI) medium driven by an horizontal electric dipole (HED) in the transverse magnetic (TM) and transverse electric (TE) mode published in Andréis and MacGregor (2008). It is able to compute the contribution of the...
bachelor thesis 2016
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Hassan, A.M. (author)
Characterization of fluid properties is significant in the petroleum engineering practice, especially in solvent-based enhanced oil recovery (SEOR) where the use of injected chemicals should ideally be reduced to the bare minimum in order to minimize the costs and environmental impact of SEOR. However, current techniques for measurement inside...
master thesis 2015
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Benthem, M. (author)
A wide range of wildlife has their habitat around and within levees or other types of embankment structures. In the Netherlands the burrowing of the muskrat causes internal and external erosion, altering the geometry of the earthen structure. As often century-old embankments protect the densely populated land against the water, the burrowing can...
master thesis 2015
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Maas, P.J. (author)
In the field of exploration geophysics various methods are applied to determine the physical properties of the subsurface of the Earth. Some of the methods most widely used are seismic and electromagnetic surveys, which are each used according to the type of information that is being sought and their ability to provide that information. The...
master thesis 2014
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Frank, J.G. (author)
Green's function retrieval by seismic interferometry (SI) exists in a variety of forms. Many of the applications of SI allow the creation of new seismic traces by crosscorrelating a wavefield recorded at two separate locations. The sum of this operation over multiple sources results in the creation of a new signal such that one of the recording...
master thesis 2013
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Meijer, W.Y. (author)
Numerical models were used to recursively compute the density profile and the seismic velocity profile of three different artificial models of the underground from primary reflection images obtained from multi-angle incident plane wave reflection data. The aim is to investigate the effect of errors in the obtained primary reflection amplitudes...
bachelor thesis 2012
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Velds, C.B. (author)
Measuring and analyzing ground penetrating radar data on different sand-clay soils as a function of water content
bachelor thesis 2012
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Deen, M.M. (author)
The objective of thesis is to see at which rate and depth Arsenic (As) contaminated water flows into deep wells in the subsurface of a small region in Bihar, India. The method of investigation is interpretation of geological data and implementing this in a flow model built in Comsol Multiphysics 4.2a. Interpretation of the data is done by grain...
bachelor thesis 2012
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Hartstra, I.E. (author)
Seismic and electromagnetic imaging methods both provide the geophysicist with different types of medium parameters. Seismic methods are sensitive to the elastic properties of the medium, while electromagnetic methods are sensitive to the electric properties. In porous-saturated media, these two wave fields occur as a coupled system, which is...
master thesis 2012
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Schaepman, G. (author)
In Bihar, India, arsenic rich aquifers are used as a drinking water source by millions of people, even though the arsenic concentration in some places is so high it causes serious health issues. The arsenic concentrations in the aquifers show a large spatial variability, one that is presently unpredictable. The most important factors which play...
master thesis 2012
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Kermen, E. (author)
Water-flooding in heavy oils is generally not an efficient way of production due to high viscosity of heavy oil compared to water. Therefore, thermal recovery methods are commonly used in heavy oil production. Most thermal methods involve fluid injection to transfer heat further into the reservoir. Hot water-flooding is among these methods. In...
master thesis 2011
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Menzel-Jones, G. (author)
Elastodynamic and electromagnetic processes are coupled together in saturated, porous media, by a phenomenon known as the electrokinetic effect. In horizontally layered media, the seismoelectric system, which contains the coupled elastodynamic and electromagnetic systems, can be separated into two independent modes of propagation: SH-TE and P-SV...
master thesis 2011
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Ogunbo, J.N. (author)
The numerical modeling with the diffusive controlled source electromagnetic (CSEM) method has been used to validate the published results of Ellis et al. (2010a) by first investigating the validity of effective medium theory for both horizontally layered isotropic and vertically transverse isotropic (VTI) layered earth. Ellis et al. (2010a) used...
master thesis 2011
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