A5042594626- Groundwater flow and contamination studies
- Groundwater and Isotope Geochemistry
- Hydrology and Watershed Management Studies
- Soil and Unsaturated Flow
- Hydrological Forecasting Using AI
- Hydraulic Fracturing and Reservoir Analysis
- Fecal contamination and water quality
- Flood Risk Assessment and Management
- Water Quality and Resources Studies
- Bioenergy crop production and management
- Hydrology and Sediment Transport Processes
- Biofuel production and bioconversion
- Urban Stormwater Management Solutions
- Radioactivity and Radon Measurements
- Soil and Water Nutrient Dynamics
- Water Quality and Pollution Assessment
- NMR spectroscopy and applications
- Enhanced Oil Recovery Techniques
- Bioeconomy and Sustainability Development
- Soil erosion and sediment transport
- Geophysical Methods and Applications
- Hydrology and Drought Analysis
- Sustainability and Ecological Systems Analysis
- Chromium effects and bioremediation
- Water Treatment and Disinfection
National Energy Technology Laboratory
2021
United States Department of Energy
2021
University of Tennessee at Knoxville
2004-2013
Environmental Protection Agency
2013
Biotechnology Institute
2011
Oak Ridge National Laboratory
2011
University of Memphis
2001-2008
Center for Environmental Health
2006
ASCE Foundation
2001
American Society of Civil Engineers
2001
Bacteroides species are promising indicators for differentiating livestock and human fecal contamination in water because of their high concentration feces potential host specificity. In this study, a real-time PCR assay was designed to target (AllBac) present human, cattle, equine feces. Direct amplification (without DNA extraction) using the AllBac tested on diluted water. Fecal concentrations threshold cycle were linearly correlated, indicating that can be used estimate total amount...
Abstract On its revolutionary threshold, quantum sensing is creating potentially transformative opportunities to exploit intricate mechanical phenomena in new ways make ultrasensitive measurements of multiple parameters. Concurrently, growing interest has created for deployment improve processes pertaining energy production, distribution, and consumption. Safe secure utilization dependent upon addressing challenges related material stability function, monitoring infrastructure, accuracy...
Laboratory microcosm experiments were used to assess the effects of environmental parameters on persistence Bacteroides 16S rRNA genes derived from equine fecal samples in stream water investigate utility spp. as indicator organisms. Quantitative real-time polymerase chain reaction (qPCR) was measure gene concentrations over time with treatments designed compare filtered vs. unfiltered water, aggregate size, initial concentrations, and temperatures. Comparison Bacteroides16S genes/mL...
Better understanding of bacterial fate and transport in watersheds is necessary for improved regulatory management impaired streams. Novel statistical time series analyses coliform data can be a useful tool evaluating the dynamics temporal variation persistence bacteria within watershed. For this study, daily total Little River East Tennessee from 1 Oct. 2000 to 31 Dec. 2005 were evaluated using novel techniques. The objective study was analyze concentration to: (i) evaluate coliform, (ii)...
This study analyzed the occurrence of Escherichia coli in a mixed land-use watershed with human, cattle, and wildlife fecal inputs located karstic geologic region using synoptic monitoring (samples taken throughout system) during base-flow conditions. The objective was to evaluate E. conditions for several months at seven different main channel nine tributary sampling sites Stock Creek watershed, 49.3-km(2) basin Knoxville, TN. densities were measured Colilert (Defined Substrate Technology)...
Chromium has served as an exceptional and necessary elemental component of many industrial processes consumer products. Its prevalence in the global environment both a dissolved wind‐borne constituent prompted concern during last several decades due to large migration potential biological toxicity various Cr chemical species. The objective this study was develop improved understanding predictive capability rates mechanisms competing geochemical redox sorption reactions that govern fate...
Abstract This paper presents an analysis of the occurrence and uncertainty source‐specific Bacteroides Escherichia coli in a stream mixed land‐use watershed with human, cattle, wildlife fecal inputs located karstic geologic region during baseflow conditions. The objectives study were to evaluate occurrence, hydrologic significance, source mass using assays for total (AllBac) bovine‐specific (BoBac), then compare these measurements E. densities loads. Samples collected conditions over several...
Simplified models have been proposed to describe dense nonaqueous phase liquids (DNAPL) source mass discharge versus time assuming that aqueous transfer is proportional the DNAPL remaining raised power of a “source architecture” coefficient. Recent studies suggest predictions may be improved using multiple functions for different architectures. However, multiple‐source require estimation additional parameters, which can difficult do from available field data. A hypothetical problem was...
As issues of source water protection drinking supplies have come to the forefront, methodology effectively manage semiconfined aquifers is still unclear. Commonly, area around wellhead considered most risk sensitive area, but in settings areas may be located some distance away from wellhead. This research employed use age-distribution modeling concert with environmental tracers (tritium/helium-3), geochemical, and other hydrogeologic data. A synthetic test case was developed determine...
A continued important area of research in hydrologic modeling is the issue spatial and temporal scaling biogeochemical properties processes. Hurst analysis, which a fractal-based scale invariant approach for analyzing long-term time series data, can provide insight into this as quantitative evaluating series. The objectives paper were to compute coefficient (H) water quality variables, study effects seasonality on H, determine how H indicators are related that parameters (e.g., discharge...
The movement of water from a shallow aquifer to semiconfined through localized area leakage in an aquitard, designated as aquitard window, is concern certain gulf coastal plain settings. Locating these windows, or areas leakage, has been historically arduous. purpose this study was evaluate the use genetic algorithm (GA) technique inverse for locating highly probable based upon head data near suspected leakage. GA previously tested on synthetic alone, and research offers insight into...
The goal of any groundwater inverse problem is to identify the distribution an input function or certain other variables describing unique flow dynamics aquifer system. A genetic algorithm (GA) combined with a numerical modeling technique useful in determining both spatial and flux represented by accretion component equation. GA was compared modified Gauss-Newton iterative technique. Binary hexadecimal representations provided mapping parameters from operators model. used patterns that...
A means of upscaling the effective saturated hydraulic conductivity, 〈 K 〉, based on spatial variation in conductivity ( ) field is essential for application flow and transport models to practical problems. Multifractals are inherently scaling thus may offer solutions this dilemma. Random two‐dimensional geometrical multifractal fields (multifractal Sierpinski carpets with a scale factor b = 3) were constructed iterations i 1 through 5 using different generator probability values p ). The...