A5033733533- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Hydrology and Sediment Transport Processes
- Urban Stormwater Management Solutions
- Soil erosion and sediment transport
- Wastewater Treatment and Nitrogen Removal
- Fish Ecology and Management Studies
- Fecal contamination and water quality
- Bacterial biofilms and quorum sensing
- Parasitic Infections and Diagnostics
- Water Treatment and Disinfection
- Microbial Community Ecology and Physiology
- Aquatic Invertebrate Ecology and Behavior
- Soil and Unsaturated Flow
- Hydrocarbon exploration and reservoir analysis
- Mine drainage and remediation techniques
- Flood Risk Assessment and Management
- Geological formations and processes
- Smart Materials for Construction
- Methane Hydrates and Related Phenomena
- SARS-CoV-2 detection and testing
- Groundwater and Isotope Geochemistry
- Coastal wetland ecosystem dynamics
- Freshwater macroinvertebrate diversity and ecology
Northwestern University
2016-2025
McCormick (United States)
2021-2023
Northwestern University
2015-2022
ORCID
2019
Ben-Gurion University of the Negev
2007
New Orleans Public Library
2003
Drexel University
2000
California Institute of Technology
1997-2000
Stroud Water Research Center
2000
Fifty years of hyporheic zone research have shown the important role played by as an interface between groundwater and surface waters. However, it is only in last two decades that what began empirical science has become a mechanistic devoted to modeling studies complex fluid dynamical biogeochemical mechanisms occurring zone. These efforts led picture surface-subsurface water interactions regulators form function fluvial ecosystems. Rather than being isolated systems, bodies continuously...
Biofilm cells are less susceptible to antimicrobials than their planktonic counterparts. While this phenomenon is multifactorial, the ability of matrix reduce antibiotic penetration into biofilm thought be limited importance studies suggest that antibiotics move fairly rapidly through biofilms. In study, we monitored transport two clinically relevant antibiotics, tobramycin and ciprofloxacin, non-mucoid Pseudomonas aeruginosa To our surprise, found positively charged sequestered periphery,...
The COVID-19 pandemic has severely impacted public health and the worldwide economy. Converging evidence from current pandemic, previous outbreaks controlled experiments indicates that SARS-CoVs are present in wastewater for several days, leading to potential risks via waterborne aerosolized pathways. Conventional treatment provides only partial removal of SARS-CoVs, thus safe disposal or reuse will depend on efficacy final disinfection. This underscores need a risk assessment management...
An understanding of the transport and survival microbial pathogens (pathogens hereafter) in agricultural settings is needed to assess risk pathogen contamination water food resources, develop control strategies treatment options. However, many knowledge gaps still remain predicting fate runoff water, then through shallow vadose zone groundwater. A number pathways, processes, factors, mathematical models often are describe settings. The level complexity dramatically enhanced by soil...
Soil profiles are rarely homogeneous. Resource availability and microbial abundances typically decrease with soil depth, but microbes found in deeper horizons still important components of terrestrial ecosystems. By studying 20 across the United States, we documented consistent changes bacterial archaeal communities depth. Deeper soils harbored distinct from those more commonly studied surface horizons. Most notably, that candidate phylum Dormibacteraeota (formerly AD3) was often dominant...
Bidirectional flow between surface water and sediment leads to high accumulation of small lightweight microplastics in rivers.
Stream-subsurface exchange processes are important because of their role in controlling the transport contaminants and ecologically relevant substances streams. Laboratory flume experiments were conducted to examine solute with gravel streambeds. Two morphologies studied: flat beds covered by dune-shaped bedforms. High rates observed under a wide range stream flow conditions, indicating that there was considerable turbulent coupling pore water flows. The presence bedforms produced additional...
Temporary storage of solutes in streams is often controlled by flow‐induced uptake hyporheic zones. This phenomenon accounts for the tails that are generally observed following passage a solute pulse, and such exchange particularly important transport reactive substances can be subject to various biogeochemical processes subsurface. Advective pumping, induced streamflow over an irregular permeable bed, leads distribution pore water flow paths streambed corresponding subsurface residence...
Hyporheic exchange is generally analyzed with the assumption of a homogeneous hyporheic zone. In reality, streambed sediments have heterogeneous structure, and this natural heterogeneity produces spatially variable interfacial fluxes complex patterns. To assess basic effects sediment structure on exchange, we performed salt dye injection experiments in recirculating laboratory flume two beds characterized by negative‐exponential correlated random hydraulic conductivity fields. Dye injections...
It is necessary to improve our understanding of the exchange dissolved constituents between surface and subsurface waters in river systems order better evaluate fate water‐borne contaminants nutrients their effects on water quality aquatic ecosystems. Here we present a model that can predict hyporheic at bed‐form‐to‐reach scale using readily measurable system characteristics. The objective this effort was compare flow induced scales ranging from very small bed forms up much larger planform...
Hyporheic exchange (mixing of stream water with pore beneath the stream) is responsible for transport many ecologically relevant substances across stream‐subsurface interface. This process dependent on both streamflow conditions and sedimentary properties, but complex nature fluvial systems has presented a barrier to development mechanistic understanding dynamics interactions. work presents results controlled study examine in detail relationship between fluxes, delivery suspended sediments...
Surface‐subsurface flow interactions are critical to a wide range of geochemical and ecological processes the fate contaminants in freshwater environments. Fractal scaling relationships have been found distributions both land surface topography solute efflux from watersheds, but linkage between those observations has not realized. We show that fractal nature fluvial glacial systems produces recharge, discharge, associated subsurface patterns. Interfacial flux tends be dominated by...
Thermoelectric power plants traditionally have required huge volumes of water to condense steam from the turbine exhaust. The complex interdependency between and energy poses new challenges for policy makers achieve a safe, secure sustainable supply in future. Cooling systems are most water-intensive part thermoelectric generation process, presenting significant opportunities reduce withdrawal consumptive use fresh water. Reuse impaired cooling can freshwater decrease contamination...
Hyporheic flow in streams has typically been studied separately from geomorphic processes. We investigated interactions between bed mobility and dynamic hyporheic storage of solutes fine particles a sand‐bed stream before, during, after flood. A conservatively transported solute tracer (bromide) (5 μ m latex particles), surrogate for particulate organic matter, were co‐injected during base flow. The tracers differentially stored, with penetrating more shallowly retained efficiently due to...
Conceptualizing catchments as physicochemical filters is an appealing way to link streamflow discharge and concentration time series hydrological biogeochemical processing in hillslopes drainage networks. Making these links explicit challenging complex watersheds but may be possible highly modified where processes are simplified. Linking filtering from a water quality perspective order identify the major controls on chemical export at different spatial temporal scales. This study...
[1] Stream channel morphology from grain-scale roughness to large meanders drives hyporheic exchange flow. In practice, it is difficult model flow over the wide spectrum of topographic features typically found in rivers. As a result, many studies only characterize isolated processes at single spatial scale. this work, we simulated flows induced by range geomorphic including meanders, bars and dunes sand bed streams. Twenty cases were examined with 5 degrees river meandering. Each meandering...
Pipes that transport drinking water through municipal distribution systems (DWDS) are challenging habitats for microorganisms. Distribution networks dark, oligotrophic and contain disinfectants; yet microbes frequently form biofilms attached to interior surfaces of DWDS pipes. Relatively little is known about the species composition ecology these due challenges associated with sample acquisition from actual DWDS. We report analysis five pipe samples collected same region a in Florida, USA,...
Microplastics are abundantly found in streambed sediments, including both small and low-density particles of neutral positive buoyancy. Although the flow water into sediments (hyporheic exchange) has previously been shown to increase rate delivery fine streambed, influence hyporheic exchange on microplastic fate aquatic environments not yet assessed detail. Here we evaluate effects microplastics by calculating comparing rates gravitational settling for combinations particle size density most...
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...
Abstract Fine sediment deposition in streambeds can reduce pore water fluxes and the overall rate of hyporheic exchange, producing deleterious effects on benthic ecological communities. To increase understanding factors that control reduction exchange by fine deposition, we conducted experiments a laboratory flume to observe changes rates solute kaolinite clay as substantial amounts accumulated streambed. Two long‐term were conducted, with durations 14 days 29 days. Use system allowed steady...
Fine sediment exchange between a stream and the surrounding subsurface influences downstream contaminant transport ecology. Fundamental models for this were developed on basis of (1) hydraulics bed form‐driven advective pore water flow (2) colloid processes. First, model was to predict induced in sand by over bedforms. The resulting “pumping” rate calculated based streamflow conditions, form geometry, depth. pumping suspended then superimposing particle settling including effect...