A5059732218- Geophysical Methods and Applications
- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Geophysical and Geoelectrical Methods
- Landslides and related hazards
- Climate change and permafrost
- Soil Moisture and Remote Sensing
- Underwater Acoustics Research
- Groundwater flow and contamination studies
- Microwave Imaging and Scattering Analysis
- Methane Hydrates and Related Phenomena
- Seismology and Earthquake Studies
- Cryospheric studies and observations
- Soil and Unsaturated Flow
- Geological Studies and Exploration
- Image and Signal Denoising Methods
- Image Processing and 3D Reconstruction
- Hydrology and Watershed Management Studies
- Geological Modeling and Analysis
- Plant Water Relations and Carbon Dynamics
- Hydrocarbon exploration and reservoir analysis
- Soil Geostatistics and Mapping
- Geomagnetism and Paleomagnetism Studies
- Geochemistry and Geologic Mapping
- Arctic and Antarctic ice dynamics
University of Potsdam
2016-2025
Environmental Earth Sciences
2019
Earth Science Institute of the Slovak Academy of Sciences
2017
Helmholtz Centre for Environmental Research
2010
ETH Zurich
2004-2008
SINTEF
2008
University of Canterbury
2008
GNS Science
2008
École Polytechnique Fédérale de Lausanne
2002-2007
University of Lausanne
2006
Three-dimensional ground-penetrating radar (GPR) data are routinely acquired for diverse geologic, hydrogeologic, archeological, and civil engineering purposes. Interpretations of these invariably based on subjective analyses reflection patterns. Such heavily dependent interpreter expertise experience. Using across gravel units overlying the Alpine Fault Zone in New Zealand, we demonstrate utility various geometric attributes reducing subjectivity 3D GPR analysis. We use a coherence-based...
Abstract. According to Dooge (1986) intermediate-scale catchments are systems of organized complexity, being too and yet small be characterized on a statistical/conceptual basis, but large heterogeneous in deterministic manner. A key requirement for building structurally adequate models precisely this intermediate scale is better understanding how different forms spatial organization affect storage release water energy. Here, we propose that combination the concept hydrological response...
Inversions of an individual geophysical data set can be highly nonunique, and it is generally difficult to determine petrophysical parameters from data. We show that both issues addressed by adopting a statistical multiparameter approach requires the acquisition, processing, separate inversion two or more types To combine information contained in physical-property models result inverting sets estimate spatial distribution regions where they are known at only few locations, we demonstrate...
We have investigated the potential of combining cross‐hole georadar velocity and attenuation tomography as a method for characterizing heterogeneous alluvial aquifers. A multivariate statistical technique, known k ‐means cluster analysis, is used to correlate integrate information contained in tomograms. Cluster analysis allows us identify objectively major common trends tomographic data thus “reduce” limited number characteristic parameter combinations. The application this procedure two...
In many near-surface geophysical applications, it is now common practice to use multiple methods explore subsurface structures and parameters. Such multimethod-based exploration strategies can significantly reduce uncertainties ambiguities in data analysis interpretation. We propose a novel 2D approach based on fuzzy [Formula: see text]-means cluster for the cooperative inversion of disparate sets. show that this results single zonal model which each zone characterized by set different This...
Abstract. The study deals with the identification and characterization of rapid subsurface flow structures through pedo- geo-physical measurements irrigation experiments at point, plot hillslope scale. Our investigation flow-relevant hydrological responses refers to general interplay form function, respectively. To obtain a holistic picture subsurface, large set different laboratory, exploratory experimental methods was used scales. For exploration these included drilled soil core profiles,...
Polarization of the electromagnetic wavefield has significant implications for acquisition and interpretation ground-penetrating radar (GPR) data. Based on geometrical physical properties subsurface scatterer its surrounding material, strong polarization phenomena might occur. Here, we develop an attribute-based analysis approach to extract characterize buried utility pipes using two broadside antenna configurations. First, enhance utilities by making use their distinct symmetric nature...
In this paper, we present an efficient kinematic ground-penetrating radar (GPR) surveying setup using a self-tracking total station (TTS). This combines the ability of modern GPR systems to interface with Global Positioning System (GPS) and capability employed TTS system immediately make positioning information available in standardized GPS data format. Wireless communication between is established by gain variable radio modems. Such faces two major potential limitations. First, possible...
Particle swarm optimization (PSO) is a relatively new global approach inspired by the social behavior of bird flocking and fish schooling. Although this has proven to provide excellent convergence rates in different problems, it seldom been applied inverse geophysical problems. Until today, published applications mainly focus on finding an optimum solution for simple, 1D We have PSO-based strategies reconstruct 2D P-wave velocity fields from crosshole traveltime data sets. Our inversion...
Abstract. The phrase form and function was established in architecture biology refers to the idea that functionality are closely correlated, influence each other, co-evolve. We suggest transferring this hydrological systems separate analyze their two main characteristics: form, which is equivalent spatial structure static properties, function, internal responses behavior. While approach not particularly new field research, we want employ concept explicitly pursue question of what information...
ABSTRACT We present an algorithm that performs sequentially one‐dimensional inversion of subsurface magnetic permeability and electrical conductivity by using multi‐configuration electromagnetic induction sensor data. The presented method is based on the conversion in‐phase out‐of‐phase data into effective equivalent homogeneous half‐space. In case small‐offset systems, such as portable sensors, for which are moderately coupled, half‐space can be inverted within iterative scheme. test...
Abstract We present a 2D multi-offset, multi-frequency synthetic GPR data set specifically designed to evaluate and test processing, analysis inversion techniques. The replicates realistic subsurface conditions at four sections separated by 2 m. modeled multi-offset profiles 50, 100 200 MHz frequencies using wavelets. provides robust framework for validating advanced algorithms techniques such as pre-stack depth migration, amplitude versus offset full waveform inversion. Extensive technical...
Abstract. Along much of the Arctic coast, shoreline retreat and sea level rise combine to inundate permafrost. Once inundated by seawater, permafrost usually begins degrade. Tuktoyaktuk Island (Beaufort Sea, Northwest Territories, Canada) is an important natural barrier protecting harbor but will likely be breached within next 2 decades. The state subsea its depth distribution around island are, however, still largely unknown. We collected marine electrical resistivity tomography (ERT)...
High-resolution geophysical parameter information, as it can be provided, for example, by crosshole georadar and seismic tomography, has proven to provide useful spatial information complement traditional hydrological methods such core analyses, logging techniques, tracer or pumping tests. Quantitative integration of these diverse database components is one the major challenges in field high-resolution hydrogeophysics because their different scales measurement usually weak petrophysical...
Partitioning cluster analyses are powerful tools for rapidly and objectively exploring characterizing disparate geophysical databases with unknown interrelations between individual data sets or models. Despite its high potential to extract the dominant structural information from suites of models, cluster-analysis techniques underused when analyzing This is due following limitations regarding applicability standard partitioning algorithms databases: The considered survey model area must be...
We have collected magnetic, 3D ground-penetrating-radar (GPR), and topographic data at an archaeological site within the Palace Garden of Paretz, Germany. The survey covers area approximately [Formula: see text] across a hill structure (dips up to 15°) that is partly covered by trees. primary goal this study was detect locate remains ancient architectural elements, which, from historical records, were expected be buried in subsurface site. To acquire our geophysical data, we used recently...
Mapping hydrological parameter distributions in high resolution is essential to understand and simulate groundwater flow contaminant transport. Of particular interest surface‐based ground‐penetrating radar (GPR) reflection imaging electrically resistive sediments because of the expected close link between subsurface water content dielectric permittivity, which controls GPR wave velocity reflectivity. Conventional tools like common midpoint (CMP) analysis provide physical models limited only....
SUMMARY Many geophysical inverse problems are known to be ill-posed and, thus, requiring some kind of regularization in order provide a unique and stable solution. A possible approach overcome the inversion ill-posedness consists constraining position model interfaces. For grid-based parameterization, such structurally constrained can implemented by adopting usual smooth scheme which local weight is reduced where an interface expected. By doing so, sharp contrasts promoted at locations while...
ABSTRACT We present a 2D/3D topographic migration scheme for ground‐penetrating radar (GPR) data which is able to account variable velocities by using the root mean square (rms) velocity approximation. test our synthetic 2D example and compare migrated image results obtained common GPR approaches. Furthermore, we apply it 3D field data. These examples are recorded across subsurface settings including surface topography variations in caused shallow ground water table. In such settings,...