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Filtering by: Creator Mu��oz-Amatria��n, Maria Remove constraint Creator: Mu��oz-Amatria��n, Maria Degree Name Master of Science (M.S.) Remove constraint Degree Name: Master of Science (M.S.)

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  • The Effects of Biofilm on Sandy Soil Hydrology

    Creator:
    Runion, Danielle N.
    Abstract:
    It is known that soil biota affects water dynamics through various complex mechanisms. The impact on retention by soil biota are due to a combination of changes to pore geometry, pore clogging by biofilms, biofilms that serve to connect thin water films across many pores as the soil dries, and...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Danielle N

  • Solarization in the Pacific Northwest: A Mathematical Field Model for Accumulation of Linearized Mortality from Variable Intermittent Heat

    Creator:
    Hill, Brian C.
    Abstract:
    Soil solarization trials were conducted during the growing seasons of 2016-2018 with the purpose of determining if solarization was an effective pre-planting soil disinfestation technique for tree nurseries in the Pacific Northwest. A large data set was collected on soil properties and biological indicators from 5 interdisciplinary experiments. This thesis...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Maria Ines Dragila Soil solarization trials were conducted during the growing seasons of 2016

  • 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

  • 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:
    . Title: Evaporation from Bare Soil and Soil Cracks: A Numeric Study Abstract approved: Maria Ines

  • Oceanographic Drivers of Northern California Current Phytoplankton Communities and their Fatty Acid Composition: Implications for Northwest Fisheries

    Creator:
    Smoak, Rebecca T.
    Abstract:
    Micro-plankton are a crucial component of pelagic food webs, responding rapidly to environmental changes, and providing a first step in the acquisition and transfer of nutrients to life in the ocean. In addition to the uptake of carbon, phytoplankton provide essential fatty acids (FAs) that can limit the growth of...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Maria Teresa Kavanaugh Micro-plankton are a crucial component of pelagic food webs, responding

  • 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

  • Management Applications of Remotely Sensed Dynamic Seascapes: Two Case Studies

    Creator:
    Klajbor, Willem C.
    Abstract:
    Dynamic seascapes, which are classified using a combination of remotely sensed data and model output, represent a potential tool for dynamic ecosystem-based management in marine systems. This work explores the utility of seascape classification in the context of marine resource management by examining two case studies: one involving biological relationships...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Maria T. Kavanaugh Dynamic seascapes, which are classified using a combination of remotely

  • Utilizing cooperative fisheries research to monitor and understand harmful algal blooms along the Oregon coast

    Creator:
    Gilliland, Raquel C.
    Abstract:
    Harmful algal blooms (HABs) are a problem for coastal communities, the fishing industry, and coastal organisms. Pseudo-nitzschia spp. is a regularly occurring diatom in Oregon’s coastal waters. At times, Pseudo-nitzschia spp. can facultatively produce domoic acid, a neurotoxin that can bioaccumulate in the food chain. While regular shore-based sampling provides...
    Resource Type:
    Masters Thesis
    Full Text:
    Oregon Coast Abstract approved: ______________________________________________________ Maria T

  • Plot-Scale Field Investigation : Characterizing Water Motion in Sandy Agricultural Soils

    Creator:
    Nolasco, Stephanie M.
    Abstract:
    Irrigated agricultural production in sandy soils presents several unique challenges to growers, including naturally high permeability, low native water retention, as well as high rates of water drainage losses and leaching of chemicals to the shallow aquifers. This study is an initial investigation into water motion in the sandy agricultural...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: ______________________________________________________ Maria I. Dragila

  • 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