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Variations in model discretization methodology and its effects upon groundwater modeling
Title
Variations in model discretization methodology and its effects upon groundwater modeling.
Creator
Whitman, Jason L., Florida Atlantic University, Restrepo, Jorge I.
Abstract/Description
It is a fundamental supposition in groundwater modeling that as the discretization of a model domain is increased, the model's precision increases accordingly (Anderson and Woessner, 1992). However, the quantifiable amount and specific circumstances of that benefit remain unclear. The purpose of this research is to examine the output variations discerned as a result of applying successively coarsened discretization scenarios to a groundwater model test case. The test models, comprised of both...
Show moreIt is a fundamental supposition in groundwater modeling that as the discretization of a model domain is increased, the model's precision increases accordingly (Anderson and Woessner, 1992). However, the quantifiable amount and specific circumstances of that benefit remain unclear. The purpose of this research is to examine the output variations discerned as a result of applying successively coarsened discretization scenarios to a groundwater model test case. The test models, comprised of both regular (square) and irregular forty-four individual model output solutions. Detailed analysis of the piezometric head values, mass balance flow terms, and solution convergence times for each model run provides valuable insight into the complex relationship existing between spatial discretization and its effect upon model output values. Consequently, the aforementioned relationship proves to be highly complex, often affecting multiple model parameters in dissimilar manners while maintaining consistency in others.
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Date Issued
1999
PURL
http://purl.flvc.org/fcla/dt/15750
Subject Headings
Groundwater flow--Computer simulation, Groundwater flow--Mathematical models
Format
Document (PDF)
Application of probabilistic analogy to groundwater contamination problems
Title
Application of probabilistic analogy to groundwater contamination problems.
Creator
Qiu, Xin., Florida Atlantic University, Su, Tsung-Chow, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
This thesis addresses the groundwater contamination problem from a probabilistic point of view. The objective of this study is to obtain analytical solutions for the backward type Kolmogorov equations governing certain crucial variables in the case of a two-dimensional medium. These include the rate at which pollutants enter the protected zone and the length of time that a pollutant particle takes to travel from a given location to the boundary of the protected zone. It is assumed that the...
Show moreThis thesis addresses the groundwater contamination problem from a probabilistic point of view. The objective of this study is to obtain analytical solutions for the backward type Kolmogorov equations governing certain crucial variables in the case of a two-dimensional medium. These include the rate at which pollutants enter the protected zone and the length of time that a pollutant particle takes to travel from a given location to the boundary of the protected zone. It is assumed that the groundwater flow is horizontal and uniform, and that a protected zone is located downstream. Analytical solutions are obtained by using the techniques of Laplace transform and separation of variables. Numerical results are given for two cases, one with flow coming from a boundary which is imperious to the pollutant, and another with flow coming from infinity.
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Date Issued
1993
PURL
http://purl.flvc.org/fcla/dt/14980
Subject Headings
Groundwater--Pollution--Mathematical models, Groundwater flow--Mathematical models, Pollutants
Format
Document (PDF)
Application of canal locations within grid cells to the study of surface water-groundwater interaction
Title
Application of canal locations within grid cells to the study of surface water-groundwater interaction.
Creator
Sosnowski, Robert Joseph., Florida Atlantic University, Restrepo, Jorge I.
Abstract/Description
Within St. Lucie County, Florida, a network of canals has been cut to provide flood protection, drainage, and irrigation. Many of these canals maintain a permanent to semi-permanent hydraulic connection with the surficial aquifer. MODFLOW code was used to simulate St. Lucie County groundwater levels. One of stresses that contributed to the solution of the groundwater levels, was the volume of water that flowed into or out of the aquifer through the canal system. In MODFLOW, the flow...
Show moreWithin St. Lucie County, Florida, a network of canals has been cut to provide flood protection, drainage, and irrigation. Many of these canals maintain a permanent to semi-permanent hydraulic connection with the surficial aquifer. MODFLOW code was used to simulate St. Lucie County groundwater levels. One of stresses that contributed to the solution of the groundwater levels, was the volume of water that flowed into or out of the aquifer through the canal system. In MODFLOW, the flow calculation between a canal and the aquifer is independent of the canal's location within the grid cell. The flow calculation was modified to incorporate canal location. Simulation results showed 34 percent of the model area realized groundwater levels that were plus or minus two-tenths to one-half foot when compared to the original levels. These results can be significant for model applications such as wetland protection and salt water intrusion.
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Date Issued
1999
PURL
http://purl.flvc.org/fcla/dt/15651
Subject Headings
Groundwater flow--Mathematical models, Canals--Florida--St Lucie County, Aquifers
Format
Document (PDF)