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Browsing by Author "Haggerty, Roy"
Now showing items 1-20 of 64
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Henderson, Scott Edward (2008-07-21)In this thesis, we investigate the problem of simulating Maxwell's equations in dispersive dielectric media. We begin by explaining the relevance of Maxwell's equations to 21st century problems. We also discuss the pre ...
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La Nier, Justin (2006-10-16)Hyporheic Exchange Flow (HEF) is driven by head gradients defined by the hydro-topography of the stream surface, which is controlled by the particular geomorphology of the stream. We quantified the impact of large wood, ...
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Wondzell, Steven M.; LaNier, Justin; Haggerty, Roy; Woodsmith, Richard D.; Edwards, Richard T. (American Geophysical Union, 2009)We investigated the response of hyporheic exchange flow (HEF) to wood removal in a small, low-gradient, gravel bed stream in southeast Alaska using a series of groundwater models built to simulate HEF for the initial con ...
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Vick, Christopher Flanders (2004-11-12)A relatively stable, persistent and historical problem with elevated NO₃⁻ concentrations in rural drinking wells in the southern Willamette Valley, Oregon is evident. What is the origin of NO₃⁻ in rural drinking water we ...
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Coupled transport and reaction kinetics control the nitrate source-sink function of hyporheic zones Zarnetske, Jay P.; Haggerty, Roy; Wondzell, Steven M.; Bokil, Vrushali A.; Gonzalez-Pinzon, Ricardo (American Geophysical Union, 2012-11-07)The fate of biologically available nitrogen (N) and carbon (C) in stream ecosystems is controlled by the coupling of physical transport and biogeochemical reaction kinetics. However, determining the relative role of phys ...
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Jackson, Tracie R.; Haggerty, Roy; Apte, Sourabh V.; Coleman, Anthony; Drost, Kevin J. (American Geophysical Union, 2012-10-02)Surface transient storage (STS) has functional significance in stream ecosystems because it increases solute interaction with sediments. After volume, mean residence time is the most important metric of STS, but it is un ...
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Gooseff, Michael N.; LaNier, Justin; Haggerty, Roy; Kokkeler, Kenneth (American Geophysical Union, 2005)Current stream tracer techniques do not allow separation of in-channel dead zone (e.g., eddies) and out-of-channel (hyporheic) transient storage, yet this separation is important to understanding stream biogeochemical pr ...
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Haggerty, Roy; Argerich, Alba; Marti, Eugenia (American Geophysical Union, 2008)A “smart” tracer is a tracer that provides, directly or through measurement of its concentration or in combination with another compound, at least one “bit” more of information about the environment through which it trav ...
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Swanson, Ryan D.; Singha, Kamini; Day-Lewis, Frederick D.; Binley, Andrew; Keating, Kristina; Haggerty, Roy (American Geophysical Union, 2012-10-25)Previous field-scale experimental data and numerical modeling suggest that the dual-domain mass transfer (DDMT) of electrolytic tracers has an observable geoelectrical signature. Here we present controlled laboratory exp ...
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Zarnetske, Jay P.; Haggerty, Roy; Wondzell, Steven M.; Baker, Michelle A. (American Geophysical Union, 2011)See article for Abstract.
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Carlson, Anders Eskil (2006-02-23)This dissertation concentrates on the controlling factors on the instability of the Laurentide Ice Sheet (LIS) and their effects on abrupt climate change. Northern Hemisphere climate fluctuated abruptly during the last d ...
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Blume, Theresa (2001-08-21)Fine particles and colloids, attached to grain surfaces, are abundant in the earth's subsurface. Under certain conditions these particles can be released from the matrix and transported with the mobile phase. One of th ...
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Harrington, Stephanie J (2010-06-03)The conventional advection-dispersion equation cannot adequately describe all processes driving solute transport in heterogeneous systems. This dissertation focuses on the individual influences of both chemical (Chapte ...
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Bertrand, Danelle (2010-04-14)Use of basalt aquifers for aquifer storage and recovery (ASR) systems is increasing in the Pacific Northwest due to the large aerial extent of the Columbia River Basalt Group and the suitability of basalts as ASR reservo ...
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Kasahara, Tamao (2000-08-17)Simulations of stream-subsurface water exchange (hyporheic exchange) using a three-dimensional steady state groundwater flow model and a particle tracking model in unconstrained and constrained reaches of small (2nd-or ...
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Miles, Evan S. (2011-03-23)Benton County has experienced substantial growth in the past 30 years, and is expected to continue growing (BCWP 2008). Continued development has occurred in the Willamette Valley, housing development in the nearby hills ...
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Bryenton, Andrew G. (2007-11-20)Alcoves in some river systems are cooler than the mainstem of the river and provide thermal refugia for aquatic species. An energy balance and sensitivity analysis on 3 alcoves in the Willamette River, Oregon indicate t ...
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Jordan, Michelle S. (2012-11-09)The freshwater polychaete Manayunkia speciosa was identified as an obligate host of the salmonid parasite Ceratomyxa shasta in 1997, prompting increased research on the small benthic invertebrate. Ceratomyxa shasta infec ...
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Craner, Jeremy D. (2006-04-05)Elevated groundwater nitrate (NO3 -) concentrations in the Southern Willamette Valley (SWV) caused the Oregon Department of Environmental Quality (ODEQ) to declare a Groundwater Management Area (GWMA) in Spring, 2004. ...
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Coleman, Gregory A. (2004-01-08)I examined hydrological and plant community changes associated with the implementation of a restoration management plan in two riparian meadows located within an agricultural landscape of the central Willamette Valley, ...
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