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Filtering by: Creator Dragila, Maria Remove constraint Creator: Dragila, Maria Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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  • Effects of Initial Moisture and Surface Properties on Sorptivity of Coarse Soil and Sand

    Creator:
    Ambrowiak, Gloria M.
    Abstract:
    Many different models and mechanisms of water imbibition into soil have been described in the literature. Theoretical equations based on those models exist to predict how water will flow in porous media. These models can be useful, but have their weaknesses. Research on imbibition and infiltration into soils has mostly...
    Resource Type:
    Masters Thesis

  • Physical processes that control droplet transport in rock fracture systems

    Creator:
    Hay, Katrina M.
    Abstract:
    Aquifer recharge is generally driven by fluids that move from the Earth’s surface to groundwater through the unsaturated zone, also known as the vadose zone. When the vadose zone is fractured, fluids, which may include contaminants, can move through the fracture network as well as the porous matrix. Such a...
    Resource Type:
    Dissertation
    Full Text:
    Control Droplet Transport in Rock Fracture Systems Abstract approved: Maria I. Dragila Aquifer recharge

  • Evaporation from bare soil and soil cracks: a numeric study

    Creator:
    Graham, Christopher Brian
    Abstract:
    Evaporation from bare soil was investigated using a numeric model In one set of simulations, texture and evaporative demand were analyzed as they impacted short and long term evaporation. The effect of these factors on water redistribution was also analyzed. A second set of simulations was run to determine the...
    Resource Type:
    Masters Thesis
    Full Text:
    thank Dr. Maria Dragila. Dr. Dragila has had the single greatest impact on my education and

  • Hydrological consequences of two native shrubs in semi-arid Senegal : patterns, processes, concepts and methods

    Creator:
    Kizito, Fred
    Abstract:
    Water availability is a critical limiting element in semi-arid ecosystem productivity and presents particular challenges in Sahelian countries such as Senegal. The landscapes are characterized by the presence of two common semi-arid shrubs (Piliostigma reticulatum and Guiera senegalensis), both of which may be important hydraulic regulators in these water-limited ecosystems....
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: Redacted for Privacy Maria Ines Dragila Water availability is a critical limiting

  • Evaporation synergy in a bi-textured soil system

    Creator:
    Fisher, Arthur J.
    Abstract:
    Evaporation synergy is the phenomenon in which two porous medium textures that share a common vertical boundary experience a higher cumulative evaporation than either homogeneous texture can produce. Studies that have been conducted to date address this phenomenon in relatively fine and coarse sands but not in finer textured soils...
    Resource Type:
    Masters Thesis
    Full Text:
    : Maria I. Dragila Evaporation synergy is the phenomenon in which two porous medium textures that share

  • Genesis of iron oxides in unsaturated porous media

    Creator:
    Grover, Deeksha
    Abstract:
    The kinetics of physical and chemical processes controlling the precipitation of iron oxide minerals in unsaturated media were investigated in this study. The characteristic morphology, mineralogy, and chemistry of iron oxides were also explored. Laboratory column experiments using fine and coarse grades of silica sand were conducted to compare the...
    Resource Type:
    Dissertation
    Full Text:
    Iron Oxides in Unsaturated Porous Media Abstract approved: John E. Baham Maria I. Dragila The

  • Exploring mechanisms that drive the development of reversible soil hydrophobicity

    Creator:
    Woolverton, Priscilla B.
    Abstract:
    This study focuses on one widespread characteristic of poor soil quality: hydrophobic soil. Previous research has produced conclusive evidence to show that soil hydrophobicity is affected by soil organic matter (SOM) and soil water content (WC). Hydrophobicity that responds to changes in WC is a unique form of surface hydrophobicity...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: Maria I. Dragila Markus Kleber This study focuses on one

  • Migration of E. coli and solutes to tile drains via preferential and matrix flow

    Creator:
    Moreno, Daniel
    Abstract:
    The extent of agricultural drainage has created concern for its potential undesirable effects on surface water quality. Land applications of liquid manure on tile drain fields have the potential to transport solutes and bacteria to the drains following precipitation or irrigation events and many times are directly sent to a...
    Resource Type:
    Masters Thesis
    Full Text:
    to Tile Drains via Preferential and Matrix Flow. Abstract approved: Maria I. Dragila The extent of

  • The effect of burrowing mammals on the hydrology of a drained riparian ecosystem

    Creator:
    Cassidy, James Richard
    Abstract:
    Many species of rodents and insectivores live in subterranean burrows in soils throughout the world. The soil surface perforations of burrow entrances are often connected to complex, subsurface tunnel networks. Burrow entrances and associated subsurface tunnel networks represent a link between surface and subsurface ecological function. Anecdotal observations of surface-water...
    Resource Type:
    Masters Thesis
    Full Text:
    Mammals on the Hydrology of a Drained Riparian Ecosystem. Abstract approved Maria I. Dragila Many

  • Experiences in implementing the White Method : estimating evapotranspiration using fluctuations of water table elevation

    Creator:
    Kollen, Jacob K.
    Abstract:
    Evapotranspiration (ET) is the process by which water is transferred from land to the atmosphere. ET is the second most important component of a hydrologic budget and remains difficult to estimate. The primary objective of this project was to determine the limitations of estimating ET from water table elevation fluctuations...
    Resource Type:
    Masters Thesis