A5075937929- Groundwater flow and contamination studies
- Hydrology and Watershed Management Studies
- Groundwater and Isotope Geochemistry
- Geophysical and Geoelectrical Methods
- Reservoir Engineering and Simulation Methods
- Atmospheric and Environmental Gas Dynamics
- Hydrological Forecasting Using AI
- Geology and Paleoclimatology Research
- Geochemistry and Geologic Mapping
- Research Data Management Practices
- Hydrology and Sediment Transport Processes
- Ecology and biodiversity studies
- Soil Geostatistics and Mapping
- Water Quality Monitoring and Analysis
- Water Quality Monitoring Technologies
- Geochemistry and Elemental Analysis
- Air Quality Monitoring and Forecasting
- Peatlands and Wetlands Ecology
- Water Quality and Resources Studies
- Seismic Imaging and Inversion Techniques
- Heavy metals in environment
- Hydrocarbon exploration and reservoir analysis
- Hydraulic Fracturing and Reservoir Analysis
- Groundwater and Watershed Analysis
- CO2 Sequestration and Geologic Interactions
Stanford University
2018-2024
Middlebury College
2015-2016
Decreasing duration and occurrence of northern hemisphere ice cover due to recent climate warming is well-documented; however, biogeochemical dynamics underneath the are poorly understood. We couple time-series analyses water column sediment interface (SWI) geochemistry with hydrodynamic data develop a holistic model iron (Fe), manganese (Mn), phosphorus (P) behavior shallow eutrophic freshwater bay. During periods persistent subfreezing temperatures, highly reactive pool dissolved colloidal...
Abstract. In water-stressed regions of the world, managed aquifer recharge (MAR), process intentionally recharging depleted aquifers, is an essential tool for combating groundwater depletion. Many groundwater-dependent regions, including Central Valley in California, USA, are underlain by thick unsaturated zones (ca. 10 to 40 m thick), nested within complex valley-fill deposits that can hinder or facilitate recharge. Within saturated zone, interconnected coarse-grained material (sands and...
Abstract Reactive transport models (RTMs) are essential tools that simulate the coupling of advective, diffusive, and reactive processes in subsurface, but their complexity makes them difficult to understand, develop improve without accompanying statistical analyses. Although global sensitivity analysis (SA) can address these issues, computational cost associated with most SA techniques limits use RTMs. In this study, we apply distance‐based generalized (DGSA), a novel computationally...
Beavers alter river corridor hydrology by creating ponds, increasing wetlands, and inundating floodplains, thereby enhancing surface water storage, promoting vegetation growth, improving riparian biodiversity. However, the impact of inundation on groundwater flow dynamics, particularly in mountainous alluvial floodplains commonly found North America Europe, which feature permeable gravel/cobble layers overlain a soil layer, remains uncertain. Numerical modeling across various floodplain...
Hydrologists have long recognized that stream discharge responds almost instantaneously to rainfall or snowmelt events in headwater catchments, even though the water comprises may be years decades old. This rapid mobilization of old arises from difference between celerity (or rate pressure propagation) and velocity movement) a wetting front through subsurface. The ratio velocity, known as kinematic ratio, can vary multiple orders magnitude catchments — across different storm within...
ABSTRACT Optically stimulated luminescence (OSL) and infrared (IRSL) dating were applied to cave sediments that protected from the Marine Isotope Stage 2 (MIS‐2) advance of Laurentide Ice Sheet (LIS) in Champlain Valley western Vermont. Evidence indicates these derived a subaerial landscape, requiring ice margin was north when they deposited. A basal sandy gravel deposited during MIS‐4 (∼68 ka), sand near middle composite stratigraphy MIS‐3 (∼55 layer coarse stratigraphically highest...
Physical samples are foundational entities for research across biological, Earth, and environmental sciences. Data generated from sample-based analyses not only the basis of individual studies, but can also be integrated with other data to answer new broader-scale questions. Ecosystem studies increasingly rely on multidisciplinary team-science study climate changes. While there widely adopted conventions within certain domains describe sample data, these have gaps when applied in a context....
Injection of water-based hydraulic fracturing fluid (HFF) into tight shale gas/oil formations can increase formation permeability and enhance production rates, but this process frequently causes mineral scale that occlude pore space hinder flow. To identify the most important factors control scales, we applied a novel global sensitivity analysis method—distance-based generalized (DGSA)—to reactive transport model (RTM) was previously built calibrated to simulate precipitation barite [BaSO4]...
Abstract In water‐stressed regions of the world, inundation working landscapes to replenish aquifers—known as flood‐managed aquifer recharge (flood‐MAR)—has become a valuable tool for sustainable groundwater management. Due their diverse land use histories, however, many potential sites host nonpoint source contaminants (such salts, pesticides, and fertilizers) within vadose zone that may flush during operations. To identify controls on contaminant migration, we perform stochastic...
Abstract Many individual measurement points are required to characterize groundwater velocity within an aquifer. Groundwater is most commonly measured using a network of >5 cm diameter monitoring wells, which, if not already present at site, expensive and labor‐intensive install. Drive‐point piezometers—simple, cost‐effective wells that can be installed by hand—are common tool for sampling in shallow, alluvial aquifers, but techniques require equipment too large these narrow (usually...
Process-based hydrologic models are invaluable tools for understanding the terrestrial water cycle and addressing modern resources problems. However, many computationally expensive and, depending on resolution scale, simulations can take order of hours to days complete. While techniques such as uncertainty quantification optimization have become valuable supporting management decisions, these analyses typically require hundreds model simulations, which too perform with a process-based model....
Abstract In mountainous watersheds, floodplain sediments are typically characterized by gravel bed layers capped an overlying soil unit that serves as a hotspot for biogeochemical reactivity. However, the influence of biogeochemistry on underflow composition remains unclear, especially during hydrological transitions alter vertical connectivity between overlaying soils and underlying bed. This study investigates these dynamics measuring hydraulic gradients water compositions over three years...