Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 90 for “"Contaminant Transport"”.
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Tide-influenced contaminant transport in coastal aquifers
… which cause complicated groundwater flow and contaminant transport phenomena in regions immediately adjacent to the coast. This study is designed to address the significance of tidal influence on contaminant transport by focusing on one-dimensional homogeneous coastal aquifers. This study …
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Improved predictions of contaminant transport in rivers
<p>To improve predictions of contaminant transport in rivers, two analytical models and one empirical model were evaluated. Analytical solutions of the model of Reichert and Wanner (1991), which represents mixing in the advective zone by dividing the channel into a flowing zone and a stagnant zone, …
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Inorganic contaminant transport through unsaturated clay soil
The fate of contaminant migration through the subsurface environment as well as their potential hazard to humans, animals, and aquatic life has become one of the major current concerns of the scientific community. Accordingly, various theoretical and experimental studies have been conducted on the …
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Stochastic modelling of contaminant transport in porous media
The stochastic model of solute transport describes the motion of fluid elements in a porous medium as stochastic variation of the fluid velocity, produced by pore wall impacts. This gives a stochastic differential equation for fluid displacements, and solute transport is obtained as the cumulative …
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Development of an analytical groundwater contaminant transport model
… Domestic wastewater contains a variety of contaminants that may result in degradation of water resources if the OWS is improperly designed, installed or operated. There is a large diversity in the contaminants composing the wastewater stream from household though nutrients (nitrogen, …
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Modeling person-to-person contaminant transport in enclosed environments
<p>It is essential to predict person-to-person contaminant transport in enclosed environments to improve air distribution design and reduce the infection risk from airborne infectious diseases. This study aims to improve and accelerate the simulation of person-to-person contaminant transport in …
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Soil-Bentonite Cutoff Walls: Hydraulic Conductivity and Contaminant Transport
… cutoff walls are commonly used to contain contaminants in the subsurface. A key property in determining the effectiveness of a cutoff wall is its hydraulic conductivity. There are important difficulties and uncertainties regarding the accuracy of commonly used methods of measuring the …
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Modeling contaminant transport and fate and subsequent impacts on ecosystems
… accurate mechanistic models and well-defined transport parameters. Such tools need to address the following processes: (1) aqueous speciation, (2) distribution mechanisms, (3) transport, and (4) ecological risk. The primary objective of this research is to develop a simulation tool that …
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Finite element modeling of contaminant transport through confined disposal facilities
… pore water of the dredge soils. However, these contaminants frequently seep back into the water from which the dredge was removed. The primary objective of this research was to modify the existing finite element program POLUT2D to evaluate the rate and quantity of contaminant transport through …
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Modeling contaminant transport in polyethylene and metal speciation in saliva
Properties of both chemical contaminants and polymers can impact contaminant diffusivity and solubility in new and aged polyethylene materials for pipes and geomembranes. Diffusivity, solubility, polymer and chemical properties were measured for thirteen contaminants and six polyethylene materials …
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Gwadapt: An adaptive finite element algorithm for groundwater contaminant transport problems
… algorithm is used to model groundwater flow and contaminant transport in variably saturated porous media. This numerical method is applied to models of two nuclear waste repository sites; The computer program used in this study was modified for execution on the Cray Y-MP supercomputer. …
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CFD modelling of fluid flow and contaminant transport in hydrogeological systems
… analysis to investigate fluid flow and solute transport in hydrogeological systems. The control-volume unstructured mesh configuration, based on cell-centred or vertex-based FV algorithms for CFD and CSM problems is employed. The non-linear material behaviour exhibited by porous soils and the …
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The Effect of Geothermal Heat Pumps on Subsurface Flow and Contaminant Transport
… uses FEFLOW software, to simulate heat and mass transport for a vertical closed-loop GSHP system. Steady and transient flow and heat transport results for a multiple borehole system are presented which indicate long-term effects on ground temperature. Moreover, the impact of heat exchanged with …
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A 3-dimensional H-adaptive algorithm for groundwater flow and contaminant transport
The simulation of contaminant transport through the subsurface is a very useful way to effectively design mitigation methods for cleanup and prevention of the deterioration of groundwater; The GWADAPT3 code is developed using the finite-element method and mesh adaptation to simulate groundwater …
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Large-scale models of transient unsaturated flow and contaminant transport using stochastic methods
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1984.
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Simulation of contaminant transport in groundwater systems using Eulerian-Lagrangian localized adjoint methods
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1990.
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A modified triaxial permeameter for physical characterization of parameters affecting contaminant transport through wetland deposits
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Rock Outcrops in the Canadian Shield: an Investigation of Contaminant Transport From Surface Sources in Fractured Rock Aquifers
Flow, recharge and transport dynamics in fractured rock aquifers with low lying rock outcrops is a largely unexplored area of study in hydrogeology. The purpose of this thesis is to examine these topics in an agricultural area in Eastern Ontario. The study consists of a regional scale groundwater …
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Surface spills at unconventional oil and gas sites: a contaminant transport modeling study for the South Platte alluvial aquifer
… impact groundwater. Here, I present fate and transport simulations of aqueous fluid surface spills, the most likely pathway for groundwater contamination during oil and gas production operations, with four primary goals: (1) to evaluate whether or not these spills pose risks to groundwater …
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