A5013526854- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- Drilling and Well Engineering
- Methane Hydrates and Related Phenomena
- Groundwater flow and contamination studies
- Radioactive element chemistry and processing
- Soil and Water Nutrient Dynamics
- Concrete and Cement Materials Research
- Hydraulic Fracturing and Reservoir Analysis
- Hydrology and Watershed Management Studies
- Groundwater and Isotope Geochemistry
- Soil and Unsaturated Flow
- Tunneling and Rock Mechanics
- Radioactive contamination and transfer
- Microbial Community Ecology and Physiology
- CO2 Sequestration and Geologic Interactions
- Flood Risk Assessment and Management
- Hydrology and Sediment Transport Processes
- Astrophysics and Cosmic Phenomena
- Microbial Applications in Construction Materials
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Research Data Management Practices
Pacific Northwest National Laboratory
2015-2024
Joint Global Change Research Institute
2024
Environmental Molecular Sciences Laboratory
2023
Battelle
2010-2022
National Ecological Observatory Network
2021
Washington State Department of Ecology
2020-2021
Washington State University
2010-2015
The coastal terrestrial-aquatic interface (TAI) is a highly dynamic system characterized by strong physical, chemical, and biological gradients. In particular, shifting soil redox conditions consumption of terminal electron acceptors, due in part to hydrologic conditions, driver carbon availability transformations across TAIs. However, while dynamics are well described, our ability quantitatively forecast rates oxic anoxic shifts soils with different characteristics inundation regimes...
This article is composed of three independent commentaries about the state Integrated, Coordinated, Open, Networked (ICON) principles in American Geophysical Union Biogeosciences section, and discussion on opportunities challenges adopting them. Each commentary focuses a different topic: (a) Global collaboration, technology transfer, application (Section 2), (b) Community engagement, community science, education, stakeholder involvement 3), (c) Field, experimental, remote sensing, real-time...
Sealing of wellbores in geothermal and tight oil/gas reservoirs by filling the annulus with cement is a well-established practice. Failure as result physical and/or chemical stress common problem serious environmental financial consequences. Numerous alternative blends have been proposed for oil gas industry. Most these possess poor mechanical properties, or are not designed to work high temperature environments. This reports on novel polymer-cement composite remarkable self-healing ability...
Motivated by recent advances in self-healing cement and epoxy polymer composites, we present a combined ab initio molecular dynamics sum frequency generation (SFG) vibrational spectroscopy study of calcium–silicate–hydrate/polymer interface. On stable, low-defect surfaces, the only weakly adheres through coordination hydrogen bonding interactions can be easily mobilized toward defected surfaces. Conversely, on fractured strongly anchors ionic Ca–O bonds resulting from deprotonation hydroxyl...
As global change processes modify the extent and functions of terrestrial–aquatic interfaces, variability critical dynamic transitional zones between wetlands uplands increases. However, it is still unclear how fluctuating water levels at these boundaries alter groundwater biogeochemical cycling. Here, we used high-temporal resolution data along gradients from to during freshwater coastal areas capture spatiotemporal patterns redox potential (Eh). We observed that topography influences Eh...
Abstract. The structure, function, and dynamics of Earth's terrestrial ecosystems are profoundly influenced by how often (frequency) long (duration) they inundated with water. A diverse array natural human-engineered systems experience temporally variable inundation whereby fluctuate between non-inundated states. Variable spans extreme events to predictable sub-daily cycles. Variably (VIEs) include hillslopes, non-perennial streams, wetlands, floodplains, temporary ponds, tidal systems,...
We investigated the effects of water saturation and secondary precipitate formation on Sr Cs transport through quartz sand columns under saturated unsaturated flow. Column experiments were conducted at effective ranging from 0.2 to 1.0 steady-state flow using either 0.1 M NaNO3 or simulated tank waste leachate (STWL; 1 NaOH) mimicking Hanford (Washington, USA) waste. In columns, transported like a conservative tracer, whereas was retarded relative Sr. The in all saturations could be...
Leaching behavior of Sr and Cs in the vadose zone Hanford site (Washington) was studied with laboratory-weathered sediments mimicking realistic conditions beneath leaking radioactive waste storage tanks. Unsaturated column leaching experiments were conducted using background pore water focused on first 200 volumes. The weathered prepared by 6 months reaction a synthetic tank leachate containing (10–5 10–3 molal representative LO- HI-sediment, respectively) as surrogates for 90Sr 137Cs....
Abstract Cement samples were reacted with CO 2 ‐saturated synthetic groundwater, or without added H S (1 wt.%), at 50°C and 10 MPa for up to 13 months (CO only) 3.5 + S) under static conditions. After the reaction, X‐ray computed tomography (XCT) images revealed that calcium carbonate (CaCO 3 ) precipitation occurred extensively within fractures in cement matrix, while micro‐fractures aperture size <∼50 μm cement‐basalt interface completely sealed by CaCO precipitation. Exposure of a...
The coastal terrestrial-aquatic interface (TAI) is a highly dynamic system characterized by strong physical, chemical, and biological gradients. In particular, shifting soil redox conditions, due in part to water driver of carbon availability transformations across TAIs. However, one the important unknowns TAIs how saturation drives oxic anoxic shifts soils with different characteristics inundation regimes. Continuous monitoring field sites unexpectedly revealed that flooding caused...
Abstract. The structure, function, and dynamics of Earth’s terrestrial ecosystems are profoundly influenced by the frequency duration that they inundated with water. A diverse array natural human engineered systems experience temporally variable inundation whereby fluctuate between non-inundated states. Variable spans from extreme flooding droughts to predictable sub-daily cycles. Variably (VIEs) include hillslopes, non-perennial streams, wetlands, floodplains, temporary ponds, tidal...
The coastal terrestrial-aquatic interface (TAI) is a highly dynamic system characterized by strong physical, chemical, and biological gradients. In particular, shifting soil redox conditions, due in part to water driver of carbon availability transformations across TAIs. However, one the important unknowns TAIs how soils with different characteristics inundation regimes respond quantitatively saturation resulting shifts between oxic anoxic subsurface conditions. We used field measurements,...