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Characterization of hydrologic parameters and processes in shrink-swell clay soils

Creator:: Stewart, Ryan D.
Abstract:: Vertisols and other vertic-intergrade soils are found all over the globe, including many agricultural and urban areas. These soils are characterized by their cyclical shrinking and swelling behaviors, where bulk density and porosity distribution both vary as functions of time and/or soil moisture. In turn, alterations in physical soil parameters...
Resource Type:: Dissertation
Full Text:: :___________________________________________________________ John S. Selker Vertisols and other vertic-intergrade soils are found all over the globe

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Creator:: Flugstad, Benjamin A.
Abstract:: Water conservation and water quality are rapidly increasing in importance in all areas of the world. The ability to accurately measure soil water content and salinity, over a wide variety of conditions, is key to meeting this need. A set of forward prediction models and waveform interpretation algorithms to extract...
Resource Type:: Dissertation
Full Text:: Abstract approved: _____________________________________________________________________ John S. Selker

Quantitative, multi-spectral, light-transmission imaging of colloid transport in porous media at the meso scale

Creator:: Kraft, Erika Lorna
Abstract:: Colloids, particles smaller than ten microns in diameter, are ubiquitous in the subsurface. Colloids have an effect on the transport of contaminants that bind to their surfaces, and can reduce the permeability of aquifer materials through deposition. Some microorganisms, including pathogens, are also transported in the subsurface as colloids. The...
Resource Type:: Dissertation

Physiochemical mechanisms for the transport and retention of technetium

Creator:: Jansik, Danielle P.
Abstract:: Understanding the transport and retention of radionuclides in the environment is important for protecting freshwater supplies and minimizing impact to biologic systems. Technetium-99 (Tc⁹⁹) is a radionuclide of interest due to its long half-life (2.13 x 10⁵ years) and toxicity. In the form of pertechnetate (TcO₄⁻), Tc is expected to...
Resource Type:: Dissertation

The role of near-stream zones on flow, chemistry and isotopic composition at the headwater scale

Creator:: Frentress, Jay
Abstract:: Stream discharge is a key water balance component and important factor in global change evaluations. Nevertheless, the mechanisms for streamflow generation are poorly understood. Near- stream surface saturation during precipitation events is one of the most iconic, visible indicators of rapid runoff production in upland humid catchments around the world....
Resource Type:: Dissertation
Full Text:: -) varied little (< 0.5 mg/L), despite discharge increases from 0.2 to 4 L/s. Groundwater levels within the

Movement of zoospores of Phytophthora citricola in saturated porous media

Creator:: Ochiai, Naoyuki
Abstract:: The genus Phytophthora comprises numerous plant pathogens in both natural and managed ecosystems. For Phytophthora spp. that infect roots, dispersal occurs in soil water through a combination of advection and swimming of specialized motile propagules (zoospores). Specific biological and physico-chemical processes, however, remain poorly understood, due to difficulties in studying...
Resource Type:: Dissertation
Full Text:: successful at modeling anisotropic dispersion. At low infiltration rates (<100 m s-1), simulations predict

Soil water availability and chemical transport in a pear (Pyrus communis) orchard swelling clay soil under micro and flood irigation

Creator:: Chen, Chengci, 1964-
Resource Type:: Dissertation
Full Text:: , Richard J. Roseberg, and John S. Selker 4 ABSTRACT Swelling soils are distinguished from rigid soils

Diclofop in runoff from agricultural watersheds in a high winter rainfall zone

Creator:: Hickman, John Spencer
Abstract:: Diclofop-methyl [me yl 2-(4-(2,4-dichlorophenoxy) phenoxy) propanoate] hydrolysis, degradation, and leaching were studied in field and laboratory experiments. Greater than 75% of the applied diclofop-methyl hydrolyzed to diclofop in 2 days at 4°C, the prevailing soil temperature during western Oregon winters. Degradation beyond the diclofop molecule, also an active herbicide, was...
Resource Type:: Dissertation
Full Text:: Grad6 ) e School Date thesis is presented March 29, 1983 Typed by Researcher for John S. Hickman

Multiphase flow in homogeneous and bedded porous media

Creator:: Schroth, Martin H.
Resource Type:: Dissertation
Full Text:: make up this dissertation. Dr. John S. Selker, my Minor Advisor and research project Principal

Effects of potato cropping practices on nitrate leaching in the Columbia basin

Creator:: McMorran, Jeffrey P.
Resource Type:: Dissertation
Full Text:: irrigation districts in the early 1900's, construction of the McNary dam and locks on the Columbia, and

ScholarsArchive@OSU

Characterization of hydrologic parameters and processes in shrink-swell clay soils

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Quantitative, multi-spectral, light-transmission imaging of colloid transport in porous media at the meso scale

Physiochemical mechanisms for the transport and retention of technetium

The role of near-stream zones on flow, chemistry and isotopic composition at the headwater scale

Movement of zoospores of Phytophthora citricola in saturated porous media

Soil water availability and chemical transport in a pear (Pyrus communis) orchard swelling clay soil under micro and flood irigation

Diclofop in runoff from agricultural watersheds in a high winter rainfall zone

Multiphase flow in homogeneous and bedded porous media

Effects of potato cropping practices on nitrate leaching in the Columbia basin

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