A5090835300- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Groundwater flow and contamination studies
- Smart Materials for Construction
- Wastewater Treatment and Nitrogen Removal
- Atmospheric and Environmental Gas Dynamics
- Hydrological Forecasting Using AI
- Flood Risk Assessment and Management
- Landslides and related hazards
- Remote Sensing and LiDAR Applications
- Marine and fisheries research
- Groundwater and Isotope Geochemistry
- Urban Stormwater Management Solutions
- Water Quality and Resources Studies
- Cryospheric studies and observations
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Peatlands and Wetlands Ecology
- Water Quality and Pollution Assessment
- Water resources management and optimization
- Aquatic Invertebrate Ecology and Behavior
- Landfill Environmental Impact Studies
University of Idaho
2015-2024
Charles River Laboratories (Netherlands)
2024
University of Amsterdam
2022-2023
Institute for Biodiversity
2022-2023
John Wiley & Sons (United States)
2016-2020
University of Trento
2009
Rocky Mountain Research Station
2007-2009
US Forest Service
2007-2009
Planetary Science Institute
2007-2008
University of California, Berkeley
2007
We report the first laboratory simulations of hyporheic exchange in gravel pool‐riffle channels, which are characterized by coarse sediment, steep slopes, and three‐dimensional bed forms that strongly influence surface flow. These channels particularly important habitat for salmonids, many currently at risk worldwide incubate their offspring within zone. Here we perform a set experiments examining effects discharge form amplitude on exchange, with surface‐subsurface mixing measured directly...
Abstract. Nitrous oxide (N2O) is a long-lived potent greenhouse gas and stratospheric ozone-depleting substance that has been accumulating in the atmosphere since preindustrial period. The mole fraction of atmospheric N2O increased by nearly 25 % from 270 ppb (parts per billion) 1750 to 336 2022, with fastest annual growth rate 1980 more than 1.3 yr−1 both 2020 2021. According Sixth Assessment Report Intergovernmental Panel on Climate Change (IPCC AR6), relative contribution total enhanced...
Abstract Hyporheic exchange is the mixing of surface and shallow subsurface water through porous sediment surrounding a river driven by spatial temporal variations in channel characteristics (streambed pressure, bed mobility, alluvial volume hydraulic conductivity). The significance hyporheic linking fluvial geomorphology, groundwater, riverine habitat for aquatic terrestrial organisms has emerged recent decades as an important component conserving, managing, restoring ecosystems. Here, we...
Abstract We propose that the mechanisms driving hyporheic exchange vary systematically with different channel morphologies and associated fluvial processes occur in mountain basins, providing a framework for examining physical controls on environments their spatial variation across landscape. Furthermore, distribution of within catchments represents nested hierarchy process controls. Large‐scale drivers (geology, climate, fire, land use) impose suite watershed conditions (topography,...
The high-resolution Experimental Advanced Airborne Research LIDAR (EAARL) is a new technology for cross-environment surveys of channels and floodplains. EAARL measurements basic channel geometry, such as wetted cross-sectional area, are within few percent those from control field surveys. largest mapping errors along stream banks. data adequately support 1D 2D computational fluid dynamics models frequency domain analyses by wavelet transforms. Further work needed to establish the monitoring...
Key Points A new equation is presented to analyze temperature time series from streambeds Explicit solutions calculate both water flux and thermal diffusivity directly Additional applications, error estimation, validation are provided
Significance We show that <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mrow><mml:msub><mml:mtext>N</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mtext>O</mml:mtext></mml:mrow></mml:math> emissions from riverine systems depend on river and stream size the primary source of production shifts hyporheic benthic zones in streams to water column rivers. This analysis also reveals scaling factors governing emissions. Finally, it provides a predictive tool quantify...
Hyporheic flows, which stem from the interaction between stream flow and bedform, transport solute‐laden surface waters into streambed sediments, where reactive solutes undergo biogeochemical transformations. Despite importance of hyporheic exchange on riverine ecosystem cycles, research is limited effects fluxes fate within zone. Consequently, we investigate controls flowpaths, link to morphology streamflow, prevailing redox conditions transformations occurring streambeds. We focus...
Hydropower development is the key strategy in many developing countries for energy supply, climate-change mitigation and economic development. However, it commonly assumed that river dams retain nutrients therefore reduce downstream primary productivity fishery catches, compromising food security causing trans-boundary disputes. Contrary to expectation, here we found a cascade of reservoirs along upper Mekong River increased bioavailability nitrogen phosphorus. The caused phytoplankton...
Abstract River damming has brought great benefits to flood mitigation, energy and food production, will continue play a significant role in global supply, particularly Asia, Africa, South America. However, dams have extensively altered river dynamics, including riverine connectivity, hydrological, thermal, sediment solute regimes, the channel morphology. These alterations detrimental effects on quality quantity of fish habitat associated impacts aquatic life. Indeed, been implicated decline...
A three-dimensional fluid dynamics model is developed to capture the spatial complexity of effects salmon redds on channel hydraulics, hyporheic exchange, and egg pocket habitat. We use partition relative influences redd topography versus altered hydraulic conductivity (winnowing fines during spawning) conditions for a simulated pool–riffle with placed at pool tail. Predictions show that primary factor enhancing velocities dissolved oxygen content within pocket. Furthermore, simulations...
Hyporheic flow results from the interaction between streamflow and channel morphology is an important component of stream ecosystems because it enhances water solute exchange river its bed. in pool‐riffle channels particularly complex three‐dimensional topography that spans a range partially to fully submerged conditions, inducing both static dynamic head variations. Hence, these exhibit transitional conditions streambed pressure hyporheic compared previous studies submerged, two‐dimensional...
We present a three‐dimensional semianalytical process‐based model of dissolved oxygen and inorganic nitrogen (DIN) transformation within the hyporheic zone gravel bed rivers. Oxygen multispecies solute transport is solved Lagrangian framework with DIN species modeled by linearized Monod's kinetics, temperature‐dependent reaction rate coefficients derived from field experiments. Our solutions, which are obtained under assumptions sediments uniform hydraulic properties negligible local...
Abstract Snowmelt‐dominated basins in northern latitudes provide critical habitat for salmonids. As such, these systems may be especially vulnerable to climate change because of potential shifts the frequency, magnitude, and timing flows that can scour incubating embryos. A general framework is presented examine this issue, using a series physical models link change, streamflow, channel morphology predict magnitude spatial distribution streambed consequent risk salmonid embryos at basin...
Abstract Advances in topobathymetric LiDARs could enable rapid surveys at sub‐meter resolution over entire stream networks. This is the first step to improving our knowledge of riverine systems, both their morphology and role ecosystems. The Experimental Advanced Airborne Research LiDAR B (EAARL‐B) system one such sensor, capable mapping terrestrial aquatic systems. Whereas original EAARL was developed survey littoral areas, new version, EAARL‐B, also designed for systems but has yet be...
The magnitude and mechanisms of nitrous oxide (N2O) release from rivers streams are actively debated. complex interactions hydrodynamic biogeochemical controls on emissions this important greenhouse gas preclude prediction when where N2O will be significant. We present observations column large-scale flume experiments supporting an integrative model stream sediments. Our results show a distinct, replicable, pattern generation consumption dictated by subsurface (hyporheic) residence times...
Stream water enters and exits the streambed sediment due to hyporheic fluxes, which stem primarily from interaction between surface hydraulics morphology. These fluxes sustain a rich ecotone, whose habitat quality depends on their direction magnitude. The spatiotemporal variability of is not well understood over several temporal scales consequently, we studied spatial variation pool‐riffle‐pool sequence at multiple locations winter summer. We instrumented Bear Valley Creek, an important...
Abstract Rivers are hot spots of nitrous oxide (N 2 O) emissions due to denitrification. Although the key role rivers in transforming reactive inorganic nitrogen is widely recognized, recent estimates N O by Intergovernmental Panel on Climate Change (IPCC) may be largely underestimated. This denotes a lack reliable and robust methodologies upscale denitrification, other biogeochemical processes, from local network scale. Here we demonstrate that stream hydromorphology strongly influences...
Stream water temperature plays a significant role in aquatic ecosystems where it controls many important biological and physical processes. Reliable estimates of at the daily time step are critical managing resources. We developed parsimonious piecewise Bayesian model for estimating stream temperatures that account temporal autocorrelation both linear nonlinear relationships with air discharge. The was tested 8 climatically different basins USA 34 sites within mountainous Boise River Basin...