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Filtering by: Creator Mu��oz-Amatria��n, Maria Remove constraint Creator: Mu��oz-Amatria��n, Maria Advisor Dragila, Maria I. Remove constraint Advisor: Dragila, Maria I.

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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

  • 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

  • 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

  • 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

  • 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

  • Calcium Ion Transport via Seeping Flow Events through Epikarst Microfissures

    Creator:
    Windom, Lisa M.
    Abstract:
    Solute transport models in karst groundwater must consider variable and complex flow regimes. Within fissures less than 2 mm in aperture, during unsaturated flow events, seeping flow may flow as films or under capillary tension as a capillary rivulet. This project focuses on exploring the mass transport characteristics of seeping...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Maria Dragila John Selker Solute

  • 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:
    approved: Maria I. Dragila Jennifer L. Parke The genus Phytophthora comprises numerous plant