A5072370658- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Hydrology and Sediment Transport Processes
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Urban Stormwater Management Solutions
- Groundwater and Isotope Geochemistry
- Geophysical and Geoelectrical Methods
- Hydrological Forecasting Using AI
- Flood Risk Assessment and Management
- Wastewater Treatment and Nitrogen Removal
- Smart Materials for Construction
- Environmental Conservation and Management
- Microbial Community Ecology and Physiology
- Freshwater macroinvertebrate diversity and ecology
- Water Quality and Pollution Assessment
- Water Quality Monitoring Technologies
- Aquatic Invertebrate Ecology and Behavior
- Environmental law and policy
- Metabolomics and Mass Spectrometry Studies
- Wastewater Treatment and Reuse
- Evaluation of Teaching Practices
- Marine and coastal ecosystems
- Water-Energy-Food Nexus Studies
Indiana University Bloomington
2016-2025
Oregon State University
2022-2025
Charles River Laboratories (Netherlands)
2024
Indiana University
2017-2022
Colorado School of Mines
2022
Bridge University
2022
Lafayette College
2022
University of Calgary
2022
Johnson Space Center
2022
Cornell University
2022
Complementary or unconventional treatments are used by many doctors and other therapists throughout Europe. The major forms acupuncture, homoeopathy, manual therapy manipulation, phytotherapy herbal medicine. relative popularity of therapies differs between countries, but public demand is strong growing. Regulation practitioners varies widely: in most countries only registered health professionals may practice, the United Kingdom practice virtually unregulated. Germany some Scandinavian have...
Rivers are important ecosystems under continuous anthropogenic stresses. The hyporheic zone is a ubiquitous, reactive interface between the main channel and its surrounding sediments along river network. We elaborate on physical, biological, biogeochemical drivers processes within that have been studied by multiple scientific disciplines for almost half century. These previous efforts shown modulator most metabolic stream serves as refuge habitat diverse range of aquatic organisms. It also...
Abstract Non-perennial streams are widespread, critical to ecosystems and society, the subject of ongoing policy debate. Prior large-scale research on stream intermittency has been based long-term averages, generally using annually aggregated data characterize a highly variable process. As result, it is not well understood if, how, or why hydrology non-perennial changing. Here, we investigate trends drivers three signatures that describe duration, timing, dry-down period across continental...
Excess nitrogen (N) impairs inland water quality and creates hypoxia in coastal ecosystems. Agriculture is the primary source of N; agricultural management hydrology together control aquatic ecosystem N loading. Future loading will be determined by how agriculture intersect with climate change, yet interactions between changing remain poorly understood. Here, we show that precipitation patterns, resulting from interact land use to deteriorate quality. We focus on 2012–2013 Midwestern U.S....
Hyporheic hydrodynamics are a control on stream ecosystems, yet we lack thorough understanding of catchment controls these flow paths, including valley constraint and hydraulic gradients in the bottom. We performed four whole‐stream solute tracer injections under steady state conditions at H. J. Andrews Experimental Forest (Oregon, United States) collected electrical resistivity (ER) imaging to directly quantify 2‐D spatial extent hyporheic exchange through seasonal base recession. ER images...
Abstract Streamflow observations can be used to understand, predict, and contextualize hydrologic, ecological, biogeochemical processes conditions in streams. Stream gages are point measurements along rivers where streamflow is measured, often infer upstream watershed‐scale processes. When stream read zero, this may indicate that the has dried at location; however, zero‐flow readings also caused by a wide range of other factors. Our ability identify whether or not gage reading indicates dry...
Abstract High‐resolution topography reveals that floodplains along meandering rivers in Indiana commonly contain intermittently flowing channel networks. We investigated how the presence of floodplain channels affects lateral surface‐water connectivity between a river and (specifically exchange flux timescales transport) as function flow stage low‐gradient river‐floodplain system. constructed two‐dimensional, hydrodynamic model using Hydrologic Engineering Center's River Analysis System...
Hyporheic zones are of broad interest, given their location at the interface between surface and groundwaters, numerous ecological functions, as a zone interdependent physical, chemical, biological processes. research has been successful in study individual processes, but our understanding coupled, interacting processes hyporheic remains limited. Based on an analysis publications citations, interest hyporhec was catalyzed by become more balanced across disciplines functions recent years....
Groundwater–surface-water (GW-SW) interactions in streams are difficult to quantify because of heterogeneity hydraulic and reactive processes across a range spatial temporal scales. The challenge quantifying these has led the development several techniques, from centimeter-scale probes whole-system tracers, including chemical, thermal, electrical methods. We co-applied conservative smart solute-tracer tests, measurement heads, distributed temperature sensing, vertical profiles solute tracer...
Abstract Over half of global rivers and streams lack perennial flow, understanding the distribution drivers their flow regimes is critical for hydrologic, biogeochemical, ecological functions. We analyzed nonperennial using 540 U.S. Geological Survey watersheds across contiguous United States from 1979 to 2018. Multivariate analyses revealed regional differences in no‐flow fraction, date first no duration dry‐down period, with further divergence between natural human‐altered watersheds....
Rivers that cease to flow are globally prevalent. Although many epithets have been used for these rivers, a consensus on terminology has not yet reached. Doing so would facilitate marked increase in interdisciplinary interest as well critical need clear regulations. Here we reviewed literature from Web of Science database searches 12 learn (Objective 1—O1) if epithet topics consistent across categories using latent Dirichlet allocation topic modeling. We also analyzed publication rates and...
Abstract Hyporheic zones increase freshwater ecosystem resilience to hydrological extremes and global environmental change. However, current conceptualizations of hyporheic exchange, residence time distributions, the associated biogeochemical cycling in streambed sediments do not always accurately explain complexity observed streams rivers. Specifically, existing conceptual models insufficiently represent coupled transport reactivity along groundwater surface water flow paths, role...
The world faces an invisible crisis of water quality. Its impacts are wider, deeper, and more uncertain than previously thought require urgent attention—The World Bank—(Damania et al., 2019). Healthy rivers provide vital services for humans other life on Earth. Water pollution can seem like a 20th century problem: solved sorted. In reality, gains in quality have been hard won far from universal, with many pollutants persisting or even increasing. Without widespread awareness action, growing...
[1] The accumulation of discharge along a stream valley is frequently assumed to be the primary control on solute transport processes. Relationships both increasing and decreasing transient storage, decreased gross losses water have been reported with discharge; however, we yet validate these relationships extensive field study. We conducted storage mass recovery analyses artificial tracer studies completed for 28 contiguous 100 m reaches valley, repeated under four base-flow conditions....
[1] Transient storage models are widely used in combination with tracer experiments to characterize stream reaches via calibrated parameter estimates. These parameters quantify the main transport and processes. However, it is implicitly assumed that uniquely identifiable hence provide a unique characterization of stream. We investigate identifiability along conditions control for 10 breakthrough curves (BTC) 100 m pulse injections Stringer Creek, Montana, USA. Identifiability assessed...
Abstract Traditional characterization of hyporheic processes relies upon modelling observed in‐stream and subsurface breakthrough curves to estimate zone size infer exchange rates. Solute data integrate upstream behaviour lack spatial coverage, limiting our ability accurately quantify spatially heterogeneous dynamics. Here, we demonstrate the application near‐surface electrical resistivity imaging (ERI) methods, coupled with experiments using an electrically conductive stream tracer...
Despite the growing interest in hyporheic exchange and associated stream ecosystem processes, few studies consider restoration of as a design goal. Here we study three types subsurface structures for after conceptual designs published over 40 years ago. Vaux's involve modifying with low or high hydraulic conductivity material placed at streambed adjacent to confining layer below stream. In this preliminary analysis structure use two‐dimensional groundwater flow modeling simulate performance...
Despite decades of research, we lack an accurate framework to predict and manage hydrologic exchange in the river corridor associated ecosystem services functions at scales stream reaches entire networks. While many individual studies have been conducted investigate specific mechanisms, they not synthesized account for heterogeneity space, nonstationarity, multiscale feedbacks that typify corridor. As a result, contradictory predictions flux, geometry, timescale are prevalent literature. We...
Abstract The relative roles of dynamic hydrologic forcing and geomorphology as controls on the timescales magnitudes stream‐aquifer exchange hyporheic flow paths are unknown but required for management stream corridors. We developed a comprehensive framework relating diel fluctuations to in absence geomorphic complexity. simulated groundwater through an aquifer bounded by straight hillslope under time‐varying boundary conditions. found that can produce path lengths residence times span...
Headwater streams account for more than 89% of global river networks and provide numerous ecosystem services that benefit downstream ecosystems human water uses. It has been established changes in climate have shifted the timing magnitude observed precipitation, which, at specific gages, directly linked to long-term reductions large discharge. However, impacts on ungaged headwater streams, where function is tightly coupled flow permanence along corridor, remain unknown due lack data sets...