A5040739564- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Soil and Water Nutrient Dynamics
- Hydraulic flow and structures
- Fluid Dynamics and Turbulent Flows
- Coal and Its By-products
- Groundwater and Isotope Geochemistry
- Karst Systems and Hydrogeology
- Fish Ecology and Management Studies
- Geological formations and processes
- Water Quality Monitoring Technologies
- Marine and coastal ecosystems
- Soil Carbon and Nitrogen Dynamics
- Hydrological Forecasting Using AI
- Fire effects on ecosystems
- Reservoir Engineering and Simulation Methods
- Atmospheric and Environmental Gas Dynamics
- Groundwater flow and contamination studies
- Peatlands and Wetlands Ecology
- Hydrocarbon exploration and reservoir analysis
- Disaster Management and Resilience
- Air Quality Monitoring and Forecasting
- Landslides and related hazards
- Geology and Paleoclimatology Research
University of Kentucky
2015-2025
NOAA National Centers for Environmental Information
2019
University of North Carolina at Asheville
2015-2019
University of California, Merced
2009-2010
Michigan State University
2006
University of Iowa
2005
Wisconsin Department of Transportation
2005
University of Alabama at Birmingham
1996-1997
Phillips 66 (United States)
1987
▪ Abstract The literature on effects of habitat fragmentation biodiversity is huge. It also very diverse, with different authors measuring in ways and, as a consequence, drawing conclusions regarding both the ...Read More
Sediment fingerprinting has been developed by researchers over the past three decades for watershed sediment transport research. is a method to allocate nonpoint source pollutants in through use of natural tracer technology with combination field data collection, laboratory analyses sediments, and statistical modeling techniques. The offers valuable tool total maximum daily load assessment aid developing efficient remediation strategies pollution watersheds. We review methodological steps...
ABSTRACT While tracing the sources of fluvial sediment using carbon and nitrogen stable isotopic ratios ( δ 13 C 15 N) has progressed significantly over last two decades, conservativeness these tracers remains questionable. Recent work indicates that N alterations in streambed deposition zones likely represent largest source uncertainty impacting usefulness as tracers. Here we report a 14‐year dataset from streambed‐dominated basin Kentucky, USA, employ empirical model decomposition (EMD) to...
Abstract: Tracer studies are needed to better understand watershed soil erosion and calibrate models. For the first time, stable nitrogen carbon isotopes (δ 15 N δ 13 C) atomic ratio (C/N) natural tracers used investigate temporal spatial variability of processes within a sub‐watershed. Temporal was assessed by comparing N, C, C/N eroded‐soils from non‐equilibrium event immediately following freezing thawing surface soils with two events characterized equilibrium conditions downcutting....
Abstract Nitrogen (N) contamination within agricultural‐karst landscapes and aquifers is widely reported; however, the complex hydrological pathways of karst make N fate difficult to ascertain. We developed a hydrologic numerical model for agricultural‐karst, including simulation soil, epikarst, phreatic, quick flow as well biochemical processes such nitrification, mineralization, denitrification. tested on four years nitrate (NO 3 − ) data collected from phreatic conduit an overlying...
Abstract As states, cities, tribes, and private interests cope with climate damages seek to increase preparedness resilience, they will need navigate myriad choices options available them. Making these in ways that identify pathways for action support their development objectives require constructive public dialogue, community participation, flexible ongoing access science- experience-based knowledge. In 2016, a Federal Advisory Committee (FAC) was convened recommend how conduct sustained...
An understanding of the clogging fine sediments within gravel substrates is advanced through use dimensional analysis and macroanalysis previously conducted experiments in hydraulic flumes. Dimensional via Buckingham pi theorem used to suggest that dimensionless depth can be potentially collapsed using original adjusted bed-to-grain ratios, i.e., ratio substrate diameter sediment diameter, porosity, roughness Reynolds number, Peclet number. Macroanalysis statistical performed 10 published...
Abstract Understanding the physics of nitrate contamination in surface and subsurface water is vital for mitigating downstream quality impairment. Though high frequency sensor data have become readily available computational models more accessible, integration these two methods improved prediction underdeveloped. The objective this study was to utilize high‐frequency advance our understanding model representation transport an agricultural karst spring Kentucky, USA. We collected 2‐years...
Abstract: Sediments and soils were analyzed using stable carbon nitrogen isotope ratio mass spectrometry elemental analyses to evaluate the their ability indicate land‐use land management disturbance pinpoint loading from sediment transport sources in forested watersheds disturbed by surface coal mining. Samples of transported particulate organic matter collected four Southern Appalachian forest region southeastern Kentucky. The had different mining history that classified as undisturbed,...
Karst aquifers, supplying nearly 25% of the global population with drinking water, are critical yet vulnerable resources. While sediment transport modeling in karst systems has progressed, fluviokarst remain underexplored, particularly regarding multilayer dynamics during diverse hydrologic events. This study introduces a novel framework integrating stable isotope analyses (δ¹³C, δ¹⁵N) high-resolution sensor data to investigate...
Fox, James F., Charles M. Davis, and Darren K. Martin, 2010. Sediment Source Assessment in a Lowland Watershed Using Nitrogen Stable Isotopes. Journal of the American Water Resources Association (JAWRA) 46(6):1192–1204. DOI: 10.1111/j.1752‐1688.2010.00485.x Abstract: sources transported sediments were sampled lowland watershed with pronounced fine sediment storage streambed. Sediments analyzed for carbon nitrogen content stable isotopic composition. Analysis data shows that temporarily...
Abstract Excessive nitrate threatens a wide range of water resources, aquatic habitats, and sensitive infrastructure. Despite this problem, tracing nutrient from its eventual fate back to origin remains an elusive challenge due heterogeneity in how sources hydrologic pathways are connected. Typically, problem is underdetermined (i.e., too many unknowns, not enough equations) cannot be solved with existing methodologies. The theory optimal transport allows for the solution systems, here we...
Hydrologic models are robust tools for estimating key parameters in the management of water resources, including inputs, storage, and pathway fluxes. The selection process-based versus data-driven modeling structure is an important consideration, particularly as advancements machine learning yield potential improved model performance but at cost lacking physical analogues. Despite recent advancement, there exists absence cross-model comparison tradeoffs between types settings with varying...
Measurements of the distribution carbon and nitrogen isotopes in soils are needed due to their potential improve our understanding soil CO2 emissions sequestration under varying climatic conditions land management technologies. Organic isotopic elemental composition was measured baseline forest as well anthropogenically intermittently flooded southern Appalachian Mountains. For undisturbed soils, consistent relationship between column, across organic matter pools, supportive hypothesis that...
Mountaintop coal mining (MCM) in the Southern Appalachian forest region greatly impacts both soil and aquatic ecosystems. Policy practice currently place emphasize water quality stability but do not consider upland health. Here we report organic carbon (SOC) measurements other indicators for reclaimed soils to quantify health of ecosystem. The SOC sequestration rate MCM was 1.3 MgC ha(-1) yr(-1) stocks ranged from ± 0.9 20.9 5.9 Mg contained only 11% surrounding soils. Comparable reported...
The present contribution focuses on modeling the total particulate organic carbon (POC) and benthic POC transport from a lowland stream impacted by agricultural land-use. A mass balance, reach scale model is verified that accounts for water, sediment transport, temporary storage exchange with streambed, production degradation of pools in benthos. We found load highly variable during individual hydrologic events influenced mixed sources including upland, streambank sources. Benthic stocks...