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  • The effect of dissolved oxygen concentration on the activated sludge process

    Creator:
    Swanson, Gregory R.
    Abstract:
    Since the introduction of pure oxygen activated sludge systems in the late 1960's, proponents have claimed several advantages resulting from the elevated dissolved oxygen (DO) levels maintained. However, numerous comparative studies have failed to produce a consensus of professional opinion regarding the validity of these claimed advantages. The purpose of...
    Resource Type:
    Dissertation
    Full Text:
    Activated Sludge Process AN ABSTRACT OF THE THESIS OF Gregory R. Swanson for the degree of Doctor of

  • Ecology of aquatic habitats associated with stream margins

    Creator:
    Moore, Kelly M. S.
    Abstract:
    The morphology and ecological importance of habitats associated with the margin of third-order stream channels in the Oregon Cascades were studied in streams in three different riparian types: 450-year-old conifers, 40-year-old alder, and an open, herbaceous-dominated clearcut. Margins, backwaters, and side channels in streams create important habitat for fry of...
    Resource Type:
    Masters Thesis
    Full Text:
    professor, Stan Gregory, for his interest and the ideas that started this study, his advice and assistance

  • A simulation model of wood dynamics in Pacific Northwest streams

    Creator:
    Meleason, Mark Alan
    Abstract:
    Conceptually, the dynamics of wood in streams can be viewed in terms of input and in-channel processes. Input processes are associated with both the riparian (tree fall, bank cutting, windthrow) and upslope forests (mass failures). In-channel processes include log breakage, movement, and decomposition. A mechanistic view of these processes is...
    Resource Type:
    Dissertation
    Full Text:
    , Arcata, California, USA. Swanson, F. J., S. V. Gregory, J. R. Sedell, and A. G. Campbell. 1982. Land

  • Flood history and sedimentation at the mouth of Redwood Creek, Humboldt County, California

    Creator:
    Ricks, Cynthia L.
    Abstract:
    Since the early 1950's, the distribution of sediment at the mouth of Redwood Creek has been altered by the effects of channel aggradation and channelization along the lower reach. Severe flooding in 1953, 1955, and 1964 caused bank erosion, landsliding, and channel geometry changes along Redwood Creek. The increased sediment...
    Resource Type:
    Masters Thesis
    Full Text:
    . Swanson Since the early 1950's, the distribution of sediment at the mouth of Redwood Creek has been

  • Effects of input and redistribution processes on in-stream wood abundance and arrangement in Lookout Creek, western Cascades Range, Oregon

    Creator:
    Dreher, David Marshall
    Abstract:
    This study explored how selected input and redistribution processes affect the amount and arrangement of in-stream wood within the 64 km2 Lookout Creek watershed in the Andrews Forest, western Cascade Range, Oregon. A longitudinal inventory of in-stream wood was conducted over approximately 20 km of stream length in 2nd to...
    Resource Type:
    Masters Thesis
    Full Text:
    Cascade Range, Oregon. ABSTRACT APPROVED: ----------------------~ Frederick J. Swanson This study

  • Geomorphic controls on hyporheic exchange flow in mountain streams

    Creator:
    Kasahara, Tamao
    Abstract:
    Simulations of stream-subsurface water exchange (hyporheic exchange) using a three-dimensional steady state groundwater flow model and a particle tracking model in unconstrained and constrained reaches of small (2nd-order) and intermediate (5th-order) mountain streams were conducted to estimate the effects of geomorphic features on the extent, volume and residence time of...
    Resource Type:
    Masters Thesis
    Full Text:
    ,,,._ ~~o-~-~-r-~e-1_1 ________ _ Frederick J. Swanson Simulations of stream-subsurface water exchange

  • Debris flows and flood disturbance in small, mountain watersheds

    Creator:
    Snyder, Kai U.
    Abstract:
    This study examined debris flows occurring in a 125 km² study area in the Blue River watershed in the western Cascade Mountains of Oregon over a 50-year period. Debris flow occurrence was found to be concentrated in a distinct zone of high activity occupying approximately half of the study area,...
    Resource Type:
    Masters Thesis
    Full Text:
    :~----+---------------------- / Frederick J. Swanson This study examined debris flows occurring in a 125 km2 study area in the Blue

  • Dairy Cattle Nutrition and its Effect on Production, Milk, and Human Health

    Creator:
    Swanson, Katherine L.
    Abstract:
    As the world population continues to grow we must look for smarter and more sustainable ways to feed everyone. Milk is the first food humans consume and is a good source of protein, fat, and carbohydrates. The following studies sought to determine the effect of feeding blackberry pomace as a...
    Resource Type:
    Dissertation
    Full Text:
    Swanson for the degree of Doctor of Philosophy in Animal Science presented on June 8, 2018. Title

  • Land-water interactions: the riparian zone

    Creator:
    Swanson, F. J., Gregory, S. V., Sedell, J. R., and Campbell, A. G.
    Abstract:
    p.267-291 from Analysis of coniferous forest ecosystems in the Western United States.
    Resource Type:
    Part of Book
    Full Text:
    Gregory, J. R. Sedell, and A. G. Campbell INTRODUCTION The interface between aquatic and terrestrial

  • Riparian vegetation and abundance of woody debris in streams of southwestern Oregon

    Creator:
    Ursitti, Victoria L.
    Abstract:
    Riparian vegetation (trees > 10 cm dbh), woody debris (> 10 cm diam, > 1 m long), channel, and landform characteristics were inventoried in mature (80-150 yrs) and old-growth riparian areas (>250 yrs) selected from small tributaries of the Coos and Coquille River basins in southwestern Oregon. Basal area of...
    Resource Type:
    Masters Thesis
    Full Text:
    this thesis. First I'd like to thank Stan Gregory, my major professor, for his support and positive