Time-lapse GPR full-waveform inversion to monitor heat tracers at the Krauthausen test site

Understanding solute and heat transport processes in aquifers is crucial for monitoring and protecting the groundwater critical zone. Crosshole ground-penetrating radar (GPR) is a useful method for enhancing transport characterization in aquifers. Particularly, GPR full-waveform inversion (FWI) can provide subsurface images with resolution at...

Microparticle Swarms - Faster Together: The Effect of Particle Concentration on Colloidal Transport in Fractured and Porous Media

Colloidal particle swarms can show settling velocities over a thousand times as fast as that of a single particle. The transport of colloidal particles is thus strongly affected by the formation and behaviour of these particle swarms, which could have important implications for the widespread use and prevalence of colloidal particles. Swarming...

A Lagrangian passive scalar solver for mass transport in electrolytes and coupling to the particle-resolved Bluebottle: code development, testing & validation

Water electrolysis is a popular energy storage technique used in tandem with many renewable sources to convert the generated energy into storeable hydrogen. The efficiency of water electrolyzers is greatly affected by overpotential losses. Bubble evolution is a unique characteristic of flows in water electrolysis. The evolution of bubbles alter...

Coastal Aeolian Sediment Transport in an Active Bed Surface Layer: Tracer Study and Conceptual Model

Coastal aeolian sediment transport is influenced by supply-limiting factors such as sediment sorting by grain size. Sorting processes can cause a coarsening of the bed surface and influence the formation of aeolian ripples. However, it is not fully understood what influence sorting processes have on the magnitude of this transport. In this study...

The Potential of DNA-tagged Magnetic Silica Microparticle Tracers for Surface Water Tracer Hydrology: Using tracer injection experiments in the laboratory environment

Surface water tracing experiments help to identify the flow paths of in-stream mass transport. This provides useful information for developing mitigation measures for contamination, and thereby for solving environmental problems. Salts, fluorescent dyes and isotopes are commonly used tracer substances.<br/>However, it is well known these tracers...

Effects of Variations in Boundary Current Strength on the Export Pathways of Convected Water Masses in the Labrador Sea

The production of water masses formed by convection in the Labrador Sea (i.e. Labrador Sea Water, LSW) and its variability contributes to the variability of the Atlantic Meridional Overturning Circulation (AMOC). Several studies put the role of the Labrador Sea under renewed debate, and suggest a rather complex interplay between the production...

Een ray-tracer voor geodeten van lichtstralen om een zwart gat

In 2019 werd er voor het eerst een foto van een zwart gat gepubliceerd. Het betreffende super zware zwarte gat ligt in het midden van het sterrenstelsel Messier 87. In dit onderzoek willen we simulaties maken van hoe een foto van een zwart gat eruit ziet. Zowel voor een achtergrond (zoals de sterrenhemel) als de accretieschijf die eromheen zit....

Analysis of the measured data of sediment nourishments in the Rhine River

Sediment nourishments have become an attractive alternative to hard measures in counteracting long-term river bed degradation. Due to the large degree of uncertainty concerning mixed sediment morphodynamics, river authorities conduct field studies to collect data that will help in the calibration of morphological models, eventually used to...

Sensitivity analysis of the partitioning inter-well tracer test for oil saturation determination

The partitioning inter-well tracer test (PITT) is a method to determine average oil saturation between an injector-producer pair. Tracer tests can be used to quantify incremental oil recovery in enhanced oil recovery (EOR) pilots and for reservoir surveillance purposes. This study provides a sensitivity analysis of the inter-well tracer test,...

Pharmacokinetics and Dosimetry of Gallium-68 labelled Sarabesin 3 for Prostate Cancer

Objective: Prostate cancer remains one of the most prevalent forms of cancer in men aged over 65 years, with yearly around 11,200 new cases and 2,600 deaths in the Netherlands. Diagnosis of prostate cancer still relies on biopsies, which are unpleasant and invasive procedures for the patient. The new PET tracer, [68Ga]Sarabesin 3, aims to offer...

Silica Particles with Encapsulated DNA and Magnetite as Hydrological Tracer: Magnetic Concentration and Proof-of-Concept

DNA has a number of characteristics which make it very promising as a hydrological tracer. It is detectable in extremely low quantities and can provide a virtually unlimited amount of unique tracers. The DNA tracer method has been further developed towards a multipurpose tracer combining a DNA tag, a paramagnetic core and a protective coating...

Using tracer data to calibrate a flexible, topography driven conceptual hydrological model

This study explores the possibility of calibrating a conceptual hydrological model to tracer (Oxygen-18) data measured in streamflow with the ultimate goal to predict discharge. The hypothesis is that (changes in) Oxygen-18 concentrations in the stream should tell something about the relative contribution of fast runoff compared to slow runoff ...

An intrinsic sediment tracing method using natural quartz- and feldspar luminescence

The goal of a sediment tracer is to give quantitative or relative feedback on (coastal) morphological changes or track either sediment or other particles (e.g. contaminations) in sediment dynamic environments. A sediment tracer is a visible or invisible marked (sediment) grain that is artificially injected or is present in-situ. This Master...

Scour below the toe of breakwaters: Investigation of scour formation through a geometrically open filter configuration located at the toe of a rubble mound breakwater lying upon sand

Scour formation at the toe of a rubble mound breakwater can lead to abrupt failure. Nowadays, counteraction of scour via geometrically closed filter rules, geotextiles or combinations is the common practice. Alternatively, in specific cases the use of geometrically open filters can save significant amount of time and decrease constructional...

Tracer Dispersion: The effect of gravity, inertia & diffusion on fluid flow simulations

This project focuses on developing a parallel Navier Stokes simulator capable of modeling single phase dispersion in porous media at the pore scale. Many different factors can contribute to dispersion on a pore scale and this study was limited to fluid flow related factors. The model, including convective motion and diffusive (Fickian) spreading...