Search Constraints

Start Over
Filtering by: Subject Tsunamis -- Environmental aspects Remove constraint Subject: Tsunamis -- Environmental aspects File Format application/pdf Remove constraint File Format: application/pdf Peer Reviewed No Remove constraint Peer Reviewed: No Resource Type Dissertation Remove constraint Resource Type: Dissertation

Search Results

  • Patterns and processes of sediment transport following sediment-filled dam removal in gravel bed rivers

    Creator:
    Stewart, Gregory B.
    Abstract:
    Dam removal is increasingly viewed as a river restoration tool because dams affect so many aspects of river hydrology, geomorphology, and ecology; but removal also has impacts. When a dam is removed, sediment accumulated over a dam’s lifetime may be transported downstream; and the timing, fate and consequences of this...
    Resource Type:
    Dissertation
    Full Text:
    for, posed environmental or safety concerns, and/or were removed because costs of dam rehabilitation

  • Unraveling tissue regeneration using chemical genetics

    Creator:
    Mathew, Lijoy K.
    Abstract:
    The emerging field of regenerative medicine is mainly approached by two different aspects. First is the use of stem cell based models to generate a suite of differentiated cells for therapeutic applications and the alternative approach is to utilize the non-mammalian models that have the inherent capacity to regenerate their...
    Resource Type:
    Dissertation
    Full Text:
    Department of Environmental and Molecular Toxicology Dean of the Graduate School

  • Reducing sediment production from forest roads during wet-weather use

    Creator:
    Toman, Elizabeth Myers
    Abstract:
    Forest roads produce fine sediment with traffic during wet weather. If the forest road is connected to a stream it can be a source of turbidity and fine sediment that may be detrimental to aquatic organisms especially salmonids. The goal of this work was to investigate turbid runoff during wet-weather...
    Resource Type:
    Dissertation
    Full Text:
    explored the opportunity costs associated with upgrading forest roads for environmental performance

  • Uranium and technetium bio-immobilization in intermediate-scale physical models of an in situ bio-barrier

    Creator:
    Michalsen, Mandy M.
    Abstract:
    Metal and hydrogen ion acidity and extreme nitrate concentrations typical of Department of Energy (DOE) legacy waste sites pose formidable challenges to successful implementation of in situ bio-immobilization. Intermediate-scale (~ 2.5 m), flow through models of an in situ bio-barrier were constructed to investigate U and Tc removal from groundwater...
    Resource Type:
    Dissertation
    Full Text:
    __________________________________________________________________ Chair of the Department of Civil, Construction and Environmental Engineering

  • The economics of carbon sequestration in western Oregon forests

    Creator:
    Im, Eun Ho
    Abstract:
    This study considered regional forest policies for sequestering carbon in existing forests in western Oregon. A model of log markets in western Oregon was employed to examine the impacts of forest policy changes on future carbon stock, harvests, and management activities. A carbon tax program, as a mitigation option for...
    Resource Type:
    Dissertation
    Full Text:
    environmental objectives at relatively low costs. Relatively few stand-level studies have speculated on the

  • Characterization, chemodynamics and environmental impact assessment of leachates from complex organic materials

    Creator:
    Aboul-Kassim, Tarek A. T.
    Abstract:
    More than 65,000 organic chemicals are currently in commercial production with approximately 1000 added each year. Many chemicals are released into the environment as organic mixtures derived from complex hazardous or solid wastes. Of these, more than 1000 chemicals are of environmental concern because of their production quantities, toxicity, persistence,...
    Resource Type:
    Dissertation

  • Trans-Pacific and regional atmospheric transport of anthropogenic semivolatile organic compounds in the western U.S.

    Creator:
    Primbs, Toby
    Abstract:
    The atmospheric transport of anthropogenic semivolatile organic compounds (SOCs) from Asian sources to the Western U.S. was investigated. In addition, the SOC extraction method was optimized. Hansen solubility parameter plots were used to aid in the pressurized liquid extraction (PLE) solvent selection of air sampling media in order to minimize...
    Resource Type:
    Dissertation
    Full Text:
    atmospheric transport has been shown to be a major environmental transport pathway for the transport of SOCs

  • Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

    Creator:
    Sobota, Daniel J.
    Abstract:
    Land use alters the physical and biological structure of stream ecosystems and potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in abundance on the biosphere during the past century from human activities. In this dissertation, I quantified uptake and transformation of nitrate (NO₃⁻)...
    Resource Type:
    Dissertation
    Full Text:
    Environmental Monitoring and Assessment Program (EMAP) protocols (http://www.epa.gov/emap2/index.html

  • Determination of fluorochemicals in waste-dominated aqueous systems

    Creator:
    Huset, Carin A.
    Abstract:
    While fluorochemicals have been detected all over the world and in wastewater treatment plants, the effect of wastewater effluent on the receiving waters has not been evaluated. In the first study, the mass flow of fluorochemicals emanating from wastewater treatment plants along the Glatt River in Switzerland was evaluated. The...
    Resource Type:
    Dissertation
    Full Text:
    …………………………………………………….. 3 Toxicology …………………………….……………………….. 4 Environmental fate and distribution.…………………………… 6

  • Analysis of semi-volatile organic contaminants and their accumulation in remote aquatic ecosystems of the western US

    Creator:
    Ackerman, Luke K.
    Abstract:
    Many pesticides, polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and polycyclic aromatic hydrocarbons are persistent, bio-accumulative, and toxic. These semi-volatile organic compounds (SOCs) can undergo atmospheric transport and deposition in cold, remote ecosystems. A better understanding of their accumulation in the fish of these ecosystems is important to better predict...
    Resource Type:
    Dissertation
    Full Text:
    targeted for regulation and phase out by international treaties(18), as well as health and environmental