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  • 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

  • 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

  • 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

  • The impact of wood variability on the drying rate at different moisture content levels

    Creator:
    Berberović, Adin
    Abstract:
    Variability in wood properties causes boards within a stack of lumber to dry at different rates and reach different moisture content levels after drying is completed. The consequence is that the boards will have properties that differ from ones that were intended to be achieved by the drying process. The...
    Resource Type:
    Dissertation
    Full Text:
    1984)….…………………………… 2.2.4.5 Central plane moisture content for homogeneous model using low

  • 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

  • Thermodynamics of non-dilute saline solutions in variably saturated porous media

    Creator:
    Burns, Erick R.
    Abstract:
    Non-dilute salt strength solutions occur in many near surface geologic environments. In order to better understand the occurrence and movement of the water and salt, mathematical models for this non-ideal fluid need to be developed. Initial boundary value problems may then be solved to predict behavior for comparison with observations....
    Resource Type:
    Dissertation
    Full Text:
    better understand the occurrence and movement of the water and salt, mathematical models for this non

  • 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

  • Geostatistical applications to salinity mapping and simulated reclamation

    Creator:
    Al-Taher, Mohamad A.
    Abstract:
    Geostatistical methods were used to find efficient and accurate means for salinity assessment using regionalized random variables and limited sampling. The random variables selected, sodium absorption ratio (SAR), electrical conductivity (EC), and clay content were measured on samples taken over an area of fifteen square miles. Ordinary kriging and co-kriging...
    Resource Type:
    Dissertation
    Full Text:
    variation of soil properties. By far the simplest authorized model that can be fitted to one-dimensional

  • Nonlinear free boundary problems arising from soil freezing in a bounded region

    Creator:
    Mohamed, Fouad Abd El-Aal
    Abstract:
    Changes of density occur naturally in phase transition processes and introduce the bulk movement of material. It is customary in analyzing such problems to disregard this unpleasant complication and assume the densities to be equal. However, such changes are unavoidable and for one-dimensional problems the complexities introduced by this bulk...
    Resource Type:
    Dissertation
    Full Text:
    mathematical model, we have 2 been forced to take into account the thermal expansion of both the liquid