A5049635270- Geophysical and Geoelectrical Methods
- Geophysical Methods and Applications
- Seismic Imaging and Inversion Techniques
- Geological Modeling and Analysis
- Underwater Acoustics Research
- Seismic Waves and Analysis
- Geochemistry and Geologic Mapping
- Geothermal Energy Systems and Applications
- Hydrocarbon exploration and reservoir analysis
- Soil Geostatistics and Mapping
- Image Processing and 3D Reconstruction
- Non-Destructive Testing Techniques
- Geological formations and processes
- Integrated Energy Systems Optimization
- Image and Signal Denoising Methods
- Neural Networks and Applications
- Advanced Computational Techniques and Applications
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Real-time simulation and control systems
- NMR spectroscopy and applications
- Electromagnetic Simulation and Numerical Methods
- Differential Equations and Numerical Methods
- Model Reduction and Neural Networks
- CO2 Sequestration and Geologic Interactions
- Computer Graphics and Visualization Techniques
Ghent University Hospital
2022-2024
Ghent University
2021-2024
KU Leuven
2021-2024
Finding effective methods for locating groundwater resources and ensuring safe drinking water is more crucial than ever, especially in the face of climate change growing population pressures. Electromagnetic imaging techniques can significantly enhance our understanding assessment, contamination detection, overall management strategies. We discuss both time-domain frequency-domain electromagnetic methods, emphasising computational used to analyse data, along with several notable case studies...
Airborne electromagnetics (AEM) is a key tool for 3D subsurface imaging, enabling fast, efficient collection of large datasets hydrogeological studies (Deleersnyder et al., 2023; Madsen 2022). Combined with geostatistical modelling techniques, AEM data generates geologically realistic, data-consistent models (Hermans 2015). Geostatistics integrates diverse data, captures geological variability, and addresses parameter uncertainties. This study inversion results the Markov-type categorical...
This study investigates the interaction between groundwater extraction and Aquifer Thermal Energy Storage (ATES) systems, aiming to optimize subsurface resource use sustainably. As demands on grow, energy storage conflicts could impact efficiency, safety, environmental quality [1]. Using a synthetic model based Grobbendonk zone in Belgium, research simulates flow heat transport, focusing of varying distances ATES wells. The results reveal that proximity affects both temperature thermal...
The subsurface is often overlooked in the field sustainable natural resources management, even though it provides us with supporting, provisioning, regulating and cultural geosystem services. Additionally, can contribute to transition towards a more society by, for examples, storing energy extracting geothermal energy. Currently exploitation of occurs on first-come-first-served basis, which might lead inefficiencies inequities.The need development policies becomes progressively essential, as...
Human activities, such as managed aquifer recharge (MAR) and groundwater pumping, are influencing the natural flow in coastal areas. This might induce saltwater intrusion impact fresh submarine discharge (FSGD). The use of resistivity methods (electrical tomography continuous profiling) studies is very effective to investigate salt–freshwater distribution, but it can be difficult interpret quantitatively. In this study, Western Belgian coast investigated with methods, image appraisal tools...
Regularization methods improve the stability of ill-posed inverse problems by introducing some a priori characteristics for solution such as smoothness or sharpness. In this contribution, we propose multidimensional, scale-dependent wavelet-based L1-regularization term to cure ill-posedness airborne (time-domain) electromagnetic induction problem. The regularization is flexible, it can recover blocky, smooth and tunable in-between inversion models, based on suitable wavelet basis function....
The inversion of electromagnetic induction data to a conductivity profile is an ill-posed problem. Regularization improves the stability and, based on Occam's razor principle, smoothing constraint typically used. However, profiles are not always expected be smooth. Here, we develop new scheme in which transform model wavelet space and impose sparsity constraint. This constrained will minimize objective function with least-squares misfit measure domain. A domain has both temporal as spatial...
In (time-domain) Electromagnetic Induction (EMI) surveys, an image of the electrical conductivity subsurface is obtained non-invasively. An accurate interpretation data computationally expensive as it requires a full (high fidelity) 3D simulation induced electric currents embedded within iterative and ill-posed inverse problem. Therefore, this forward model usually approximated with 1D (low fidelity model) which only considers horizontal layers for fast analytical models exist. Recent work...
Full 3D inversion of time-domain Airborne ElectroMagnetic (AEM) data requires specialists’ expertise and a tremendous amount computational resources, not readily available to everyone. Consequently, quasi-2D/3D methods are prevailing, using much faster but approximate (1D) forward model. We propose an appraisal tool that indicates zones in the model agreement with multidimensional therefore, should be interpreted quantitatively. The image relies on modeling compute so-called normalized...
Understanding the subsurface is of prime importance for many geological and hydro-geological applications. Geophysical methods offer an economical alternative in-vestigating compared to costly borehole investigation methods, but geophysical results are commonly obtained through inversion whose solution non-unique. Deterministic inversions providing a unique computationally efficient while stochastic investigating full uncertainty range more expensive. In this research, we investigate...
The impacts of climate change, combined with population growth, necessitate practical and effective solutions for locating groundwater resources ensuring drinking water quality. Our contribution explores recent advances in geoelectrical electromagnetic imaging methods applied to investigate systems. Geoelectrical techniques are popular characterising subsurface properties, such as electrical resistivity or dielectric permittivity. These properties strongly related the hydrogeological...
Airborne electromagnetics made its first successful entry into mineral exploration applications, mainly by interpreting anomalies in the data. EM methods will increasingly be used for more advanced large-scale such as mapping fresh saltwater interface. Every step data interpretation is crucial this regard. We believe state-of-the-art (such [1]) a good starting point an initial interpretation, though not endpoint. propose workflow airborne processing, where current may too limited your...
Understanding the subsurface is of prime importance for many geological and hydrogeological applications. Geophysical methods offer an economical alternative investigating compared to costly borehole investigations. However, geophysical results are commonly obtained through deterministic inversion data whose solution non-unique. Alternatively, stochastic inversions investigate full uncertainty range models, yet computationally more expensive. In this research, we robustness recently...
We revisit the problem of solving one-dimensional wave equation on a domain with moving boundary. In J.Math.Phys.11, 2679 (1970), Moore introduced an interesting method to do so. As only in rare cases, closed analytical solution is possible, one must turn perturbative expansions Moore's method. investigate then made minimal assumption for convergence perturbation series, namely that boundary position should be analytic function time. Though, we prove here latter requirement not sufficient...
Full 3D modelling of time-domain electromagnetic data requires tremendous computational resources. Consequently, simplified physics models prevail in geophysics, using a much faster but approximate (1D) forward model. We propose to join the accuracy 1D model with flexibility coarse grids reduce errors, thereby avoiding full accurate simulations. exemplify our approach on airborne data, comparing error standard 3% measurement noise. find that depends specific subsurface (electrical...
Knowing the distribution between fresh and saline groundwater is imperative for sustainable integrated management of water resources in coastal areas. The airborne electromagnetic (AEM) method increasingly used hydrogeological mapping over large areas via bulk electrical resistivity. However, accurately reliably fresh/saltwater interface (FSI) requires accurate knowledge about transition zone. objective to quantify uncertainty using AEM data inform on depth FSI. study mimics a dual-moment...
If the magnetic field caused by a dipole is measured, electrical conductivity of subsurface can be determined solving inverse problem. For this problem form regularisation required as forward model badly conditioned. Commonly, Tikhonov used which adds $\ell_2$-norm parameters to objective function. As result, smooth profile preferred and these types inversions are very stable. However, it cause problems when true has discontinuities causing oscillations in obtained parameters. To circumvent...
<p>In frequency domain Electromagnetic Induction (EMI) surveys, an image of the electrical conductivity subsurface is obtained non-invasively. The can be related to important properties such as porosity, saturation or water via Archie’s law. advantage geophysical EMI surveys its cost-effectiveness because it a non-contacting method, one easily walk with device mount in on vehicle helicopter (AEM).</p><p>The process finding profile from...
<p>Accurate subsurface imaging through geophysics is of prime importance for many geological and hydrogeological applications. Recently, airborne electromagnetic methods have become more popular because their potential to quickly acquire large data sets at relevant depths However, the solution inversion EM not unique, so that electrical conductivity models can explain data. Two families be applied inversion: deterministic stochastic methods. Deterministic (or regularized)...
In coastal areas, the natural groundwater flow is affected by human activities, such as managed aquifer recharge (MAR) and extraction. They can induce saltwater intrusion impact fresh submarine discharge (FSGD). Resistivity methods, electrical resistivity tomography (ERT) continuous profiling (CRP) are easy to use very effective assess distribution of salt freshwater in environments. The Western Belgian coast, De Panne Koksijde, was already investigated with ERT CRP Paepen et al. (2022;...
Understanding the subsurface is of prime importance for many geological and hydrogeological applications. Geophysical methods offer an economical alternative investigating compared to costly boreholes investigation methods, but results are often obtained through inversion problem whose solution non-unique. There two types approaches: deterministic stochastic. Deterministic provides a unique with no way efficiently accurately assess uncertainty  relatively fast compute. Stochastic...