A5031143096- Geophysical and Geoelectrical Methods
- Geophysical Methods and Applications
- Geochemistry and Geologic Mapping
- Geomagnetism and Paleomagnetism Studies
- Seismic Waves and Analysis
- Groundwater flow and contamination studies
- NMR spectroscopy and applications
- Magnetic and Electromagnetic Effects
- Earthquake Detection and Analysis
- Hydrocarbon exploration and reservoir analysis
- Electrokinetic Soil Remediation Techniques
- Microbial Applications in Construction Materials
- Microbial Fuel Cells and Bioremediation
- Methane Hydrates and Related Phenomena
- Seismic Imaging and Inversion Techniques
- Geochemistry and Elemental Analysis
- Spectroscopy and Chemometric Analyses
- Mine drainage and remediation techniques
- Water Quality Monitoring and Analysis
- Soil Moisture and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Marine and environmental studies
- Electrostatics and Colloid Interactions
- CO2 Sequestration and Geologic Interactions
- Grouting, Rheology, and Soil Mechanics
Rutgers Sexual and Reproductive Health and Rights
2010-2024
Rutgers, The State University of New Jersey
2015-2024
Environmental Earth Sciences
2023-2024
Rütgers (Germany)
2010-2024
Science and Technology on Surface Physics and Chemistry Laboratory
2019
Queen's University Belfast
2007-2017
Hospital Universitário da Universidade de São Paulo
2015
Lawrence Berkeley National Laboratory
2005-2010
NASA Earth Science
2010
Clausthal University of Technology
2010
We analyze the relationship between induced polarization (IP) parameters and specific surface area normalized to pore volume [Formula: see text] for an extensive sample database. find that a single linear imaginary conductivity-[Formula: relation holds across range of single-frequency IP data sets composed sandstones unconsolidated sediments lack appreciable metallic mineral content. also apply recent approach defined as Debye decomposition (DD) determine chargeability text], global estimate...
We explored the use of continuous waterborne electrical imaging (CWEI), in conjunction with fiber‐optic distributed temperature sensor (FO‐DTS) monitoring, to improve conceptual model for uranium transport within Columbia River corridor at Hanford 300 Area, Washington. first inverted resistivity and induced polarization CWEI data sets distributions polarizability, from which spatial complexity primary hydrogeologic units was reconstructed. Variations depth interface between overlying...
Understanding how microorganisms influence the physical and chemical properties of subsurface is hindered by our inability to observe microbial dynamics in real time with high spatial resolution. Here, we investigate use noninvasive geophysical methods monitor biomineralization at laboratory scale during stimulated sulfate reduction under dynamic flow conditions. Alterations sediment characteristics resulting from microbe-mediated sulfide mineral precipitation were concomitant changes...
Induced polarization (IP) measurements were conducted on saturated kaolinite-, iron-, and magnetite-sand mixtures as a function of varying percentage weight mineral constituent: 0%–100% for iron magnetite 0%–32% kaolinite. We determined the specific surface area each using nitrogen gas adsorption, where porosity mixture was calculated from loss after drying. fit Cole-Cole model (Cole Cole, 1941) to electrical data obtained mixtures. In contrast, kaolinite showed power-law dependence phase-on...
We investigated the sensitivity of low‐frequency electrical measurements to microbe‐induced metal sulfide precipitation. Three identical sand‐packed monitoring columns were used; a geochemical column, an column and control column. In first experiment, continuous upward flow nutrients metals in solution was established each Cells Desulfovibrio vulgaris ( D. ) injected into center columns. Geochemical sampling post‐experiment destructive analysis showed that microbial induced sulfate reduction...
Time‐lapse resistivity imaging is increasingly used to monitor hydrologic processes. Compared conventional measurements, surface time‐lapse provides superior spatial coverage in two or three dimensions, potentially high‐resolution information time, and the absence of wells. However, interpretation electrical tomograms complicated by ever‐increasing size complexity long‐term, three‐dimensional (3‐D) time series conductivity data sets. Here we use 3‐D subsurface variations associated with...
Estimating soil C stock in a peatland is highly dependent on accurate measurement of the peat volume. In this study, we evaluated uncertainty calculations volume using high-resolution data to resolve three-dimensional structure basin based both direct (push probes) and indirect geophysical (ground-penetrating radar) measurements. We compared volumetric estimates from approaches, accounting for potential sources error, with values literature. Approximate 14 23% was observed volume, total...
ABSTRACT This paper provides an update on the fast‐evolving field of induced polarization method applied to biogeophysics. It emphasizes recent advances in understanding signals stemming from biological materials and their activity, points out new developments applications, identifies existing knowledge gaps. The focus this review is application study living organisms: soil microorganisms plants (both roots stems). We first discuss observed links between signal microbial cell structure,...
The Earth's shallow subsurface results from integrated biological, geochemical, and physical processes. Methods are sought to remotely assess these interactive processes, especially those catalysed by micro‐organisms. Using saturated sand columns the metal reducing bacterium Shewanella oneidensis MR‐1, we show that electrically conductive appendages called bacterial nanowires directly associated with electrical potentials. No significant potentials were detectable in inoculated mutant...
We measured spectral induced polarization (SIP) signatures in sand columns during (1) FeS biomineralization produced by sulfate reducing bacteria ( Desulfovibrio vulgaris ) under anaerobic conditions, and (2) subsequent biomineral dissolution upon return to an aerobic state. The low‐frequency (0.1–10 Hz peak) relaxations can be modeled with a Cole‐Cole formulation, from which the evolution of magnitude relaxation length scale estimated. find that time constant is consistent polarizable...
Stimulated sulfate‐reduction is a bioremediation technique utilized for the sequestration of heavy metals in subsurface. We performed laboratory column experiments to investigate geoelectrical response iron sulfide transformations by Desulfovibrio vulgaris . Two methods, (1) spectral induced polarization (SIP), and (2) electrodic potential measurements, were investigated. Aqueous geochemistry (sulfate, lactate, sulfide, acetate), observations precipitates (identified from electron microscopy...
The distribution of shallow frozen ground is paramount to research in cold regions, and subject temporal spatial changes influenced by climate, landscape disturbance ecosystem succession. Remote sensing from airborne satellite platforms increasing our understanding landscape-scale permafrost distribution, but typically lacks the resolution characterise finer-scale processes phenomena, which are better captured integrated surface geophysical methods. Here, we demonstrate use electrical...
Abstract Major challenges exist in delineating bedrock fracture zones because these cause abrupt changes geological and hydrogeological properties over small distances. Borehole observations cannot sufficiently capture heterogeneity systems. Geophysical techniques offer the potential to image processes between boreholes. We used three‐dimensional cross borehole electrical resistivity tomography ( ERT ) a 9 m (diameter) × 15 well field high‐resolution flow transport fractured mudstone...
SUMMARY Soil stabilization processes aim at enhancing soil's engineering properties. Although the concept is straightforward, it involves physical and chemical changes to subsurface that could result in local environmental changes. Compared conventional soil methods (such as cement grouting), bio-mediated stabilization, such microbial-induced calcite precipitation (MICP), offers opportunity minimize impact, but underlying need be well understood for proper applications. Accurate...
We performed electrical measurements on sands flushed with bacterial suspensions of varying concentration. The first experiment was conducted Shewanella putrefaciens (biomass 0–0.5 mg/L) and the second Escherichia coli 0–42 mg/L). measured a biomass‐dependent low‐frequency (10 Hz) polarization. At cell density <12 mg/L polarization decreased (up to 60 %) relative before introduction cells; decrease greater when sand artificially Fe‐coated enhance affinity cells mineral surface. >12...
Biogenic free‐phase gas (FPG) formation was induced in a peat block (dimensions 0.28 × 0.21 m) extracted from peatland Maine. Electrical resistivity (ER), surface deformation, and methane (CH 4 ) flux the monitored over 48‐day period during which temperature remained constant at 21 ± 1°C. ER measurements were made on 5 vertical electrode arrays, each containing 20 electrodes spaced 0.01‐m intervals. Surface deformation using 30 elevation rods equally across of block, average CH estimated by...
ABSTRACT We performed laboratory experiments to investigate the sensitivity of Spectral Induced Polarization (SIP) method toluene contamination in clayey soils. used mixtures quartzitic sand and montmorillonite as soil samples, artificially contaminated with varying amounts toluene. Care was taken quantify experimental uncertainty resulting from packing since such effects must be quantified if variations SIP signatures between samples are reliably interpreted terms hydrocarbon concentration....
Continuing advancements in subsurface electrical resistivity tomography (ERT) are increasing its capabilities for understanding shallow properties and processes. The inability of ERT imaging data to resolve unique structures the corresponding need include constraining information remains one greatest limitations, yet provides opportunities further advancing utility method. We propose a new method incorporating into an algorithm form discontinuous boundaries, known values, spatial covariance...
Conceptual models for the geophysical responses associated with hydrocarbon degradation suggest that long-term evolution of an oil plume will result in a more conductive anomaly than initial contamination. In response to Deepwater Horizon (DH) spill into Gulf Mexico 2010, autonomous resistivity monitoring system was deployed on Grand Terre, Louisiana, attempt monitor natural processes hydrocarbon-impacted beach sediments this island. A 48-electrode surface array 0.5-m spacing installed...