Search Constraints

Start Over
Filtering by: Subject Soil mechanics -- Mathematical models Remove constraint Subject: Soil mechanics -- Mathematical models Degree Level Doctoral Remove constraint Degree Level: Doctoral

Search Results

  • Modelling root reinforcement in shallow forest soils

    Creator:
    Skaugset, Arne E.
    Abstract:
    A hypothesis used to explain the relationship between timber harvesting and landslides is that tree roots add mechanical support to soil, thus increasing soil strength. Upon harvest, the tree roots decay which reduces soil strength and increases the risk of management -induced landslides. The technical literature does not adequately support...
    Resource Type:
    Dissertation

  • Geohydrologic conditions on a steep forested slope : modeling transient piezometric response to precipitation

    Creator:
    Bransom, Mark
    Abstract:
    Two hilislope sites in the central Oregon Coast Range were instrumented and monitored for winter precipitation and saturated and unsaturated subsurface conditions. The study sites were near-ridge depressions typically known as headwalls. Based on results of the monitoring, two existing mathematical models were adapted to predict piezometric levels in headwalls...
    Resource Type:
    Dissertation

  • Modeling shallow-water hydrodynamics : rotations, rips, and rivers

    Creator:
    Long, Joseph W.
    Abstract:
    Hydrodynamic models are used as a diagnostic tool to understand the temporal variability of shallow-water processes that are difficult to completely resolve with traditional field measurements. For all simulations, modeled quantities are qualitatively or quantitatively compared with available measurements to gain confidence in conclusions derived from the modeled results. In...
    Resource Type:
    Dissertation
    Full Text:
    . The model and data are in good agreement for all wave conditions during the month and estimated model

  • Parameters affecting mechanical collisions

    Creator:
    Aum, Ho Sung
    Abstract:
    Even though the elastic deformations that occur during the impact of colliding bodies may be small in comparison to their actual dimensions, they play an important role in mechanical collisions. During the time the bodies are in contact, elastic, friction, and inertia properties combine to produce a complex variation of...
    Resource Type:
    Dissertation
    Full Text:
    impulse and velocity changes that occur during contact. However, a considerably-simplified model captures

  • A mathematical model simulating mass transport of chemicals in saturated porous media

    Creator:
    Lindstrom, Fredrick Thomas
    Abstract:
    A mathematical model simulating mass transport of chemicals in saturated porous medium is given in four parts. Included in the development is the physical phenomenon of adsorption of molecules of chemicals on the surrounding walls of the porous medium. The four main areas of study are: (1) Simple one dimensional...
    Resource Type:
    Dissertation

  • Rebound predictions of mechanical collisions

    Creator:
    Lai, Liang-Ju
    Abstract:
    Predictions of mechanical collisions between two bodies frequently cannot be completed by the impulse-momentum equation together with a complete description of the motion of the system at the initial contact. Additional account must be taken of the deformations and frictional interaction induced by the impulsive reaction force, where the bodies...
    Resource Type:
    Dissertation
    Full Text:
    , a considerably simplified, coupled, conservative model, which captures the essential

  • Dynamic mathematical model of oxygen and carbon dioxide exchange between soil and atmosphere

    Creator:
    Ou-yang, Ying
    Abstract:
    Gaseous transport through soil in the presence of soil microorganisms has been investigated. More recently, modeling of gaseous transport in the unsaturated zone has been investigated. However, the problem of mathematical model of oxygen and carbon dioxide transport through soil, as affected by the climatic conditions, the transport of soil...
    Resource Type:
    Dissertation
    Full Text:
    of Philosophy in Soil Science presented on September 27, 1990 Title: Dynamic Mathematical Model of

  • 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:
    empirical coefficient of proportionality, β, in Bico et al.’s diffusion model. The goal of the mathematical

  • Interactions between microbial dynamics and transport processes in soils

    Creator:
    Rockhold, Mark L.
    Abstract:
    An experimental and numerical modeling investigation was conducted to study interactions between microbial dynamics and transport processes in variably saturated porous media. These interactions are important in a variety of applied problems such as water and wastewater treatment, bioremediation, and oil-field recovery operations. These processes and interactions also have great...
    Resource Type:
    Dissertation
    Full Text:
    clay soil (model parameters from Leij et al.. 1999), clean 40/50 Accusand®, and repacked. biomass

  • Rebound predictions for elastic collisions

    Creator:
    Liu, Pao-pao
    Abstract:
    In this paper, a numerical method is used to predict the response of an elastic body during a collision in which both normal and tangential impulses are important. Results are compared with those from simplified prediction procedures, which stem from the assumptions that the energy-returning capacity of the normal deformation...
    Resource Type:
    Dissertation
    Full Text:
    TRANSIENT DYNAMIC ANALYSIS IN THE ANSYS PROGRAM 37 4.1 Selection of time step size 37 4.2 Model description