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You searched for subject:(Aquifers Simulation methods). Showing records 1 – 2 of 2 total matches.

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University of Texas – Austin

1. Strassberg, Gil. A geographic data model for groundwater systems.

Degree: Civil, Architectural, and Environmental Engineering, 2005, University of Texas – Austin

Concepts and object classes of a data model for representing groundwater systems within GIS are presented, expanding the existing Arc Hydro surface water data model. The data model is designed to achieve four goals: representing regional groundwater systems, representing site scale groundwater information, enabling integration of surface water and groundwater information, and facilitating the connection of groundwater simulation models with GIS. Guided by these goals, a set of conceptual classes is identified for representing basic groundwater features, and these concepts are represented in a geodatabase design named the Arc Hydro groundwater data model. ArcGIS tools are developed to work over the data model classes: the Arc Hydro groundwater toolbar is a set of ArcScene tools for creating three-dimensional features such as stratigraphy representations, cross sections, and volume models. MODFLOW Tools are vi geoprocessing tools for populating the simulation component of the data model, and SQL based tools are used for creating two- and three-dimensional views of groundwater time series. Four case studies are presented to demonstrate the data model classes and tools. The first shows a regional three-dimensional representation of hydrostratigraphy in the North Carolina coastal aquifer system and illustrates the hydrogeology component of the data model and the functionality of the Arc Hydro groundwater toolbar. The second example shows the use of SQL based tools for creating two-dimensional water quality and water level maps in the Ogallala aquifer in Texas, and the third example shows the creation of threedimensional views of temporal information from the MADE site in Mississippi. The fourth case study demonstrates the MODFLOW geoprocessing tools for representing a MODFLOW model of the Barton Springs segment of the Edwards aquifer in Texas. Results of this study outline the main concepts and data structures for representing spatial and temporal groundwater information, and provide a blueprint for creating a geodatabase and storing groundwater data. In addition to the complete data model, a data model framework is defined for outlining the core classes needed for representing groundwater data. Technological advances include the representation, and creation of three-dimensional geographic features, and methods for storing and analyzing two and three-dimensional groundwater time series. Advisors/Committee Members: Maidment, David R. (advisor).

Subjects/Keywords: Aquifers  – Simulation methods; Aquifers  – Databases; Groundwater  – Simulation methods; Groundwater  – Databases; Geodatabases

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Strassberg, G. (2005). A geographic data model for groundwater systems. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/2333

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Strassberg, Gil. “A geographic data model for groundwater systems.” 2005. Thesis, University of Texas – Austin. Accessed December 18, 2018. http://hdl.handle.net/2152/2333.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Strassberg, Gil. “A geographic data model for groundwater systems.” 2005. Web. 18 Dec 2018.

Vancouver:

Strassberg G. A geographic data model for groundwater systems. [Internet] [Thesis]. University of Texas – Austin; 2005. [cited 2018 Dec 18]. Available from: http://hdl.handle.net/2152/2333.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Strassberg G. A geographic data model for groundwater systems. [Thesis]. University of Texas – Austin; 2005. Available from: http://hdl.handle.net/2152/2333

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Texas – Austin

2. Brown, Chrissi Lynn. Design of a field scale project for surfactant enhanced remediation of a DNAPL contaminated aquifer.

Degree: Civil, Architectural, and Environmental Engineering, 2004, University of Texas – Austin

This dissertation describes a new methodology for the use of numerical modeling in the design and interpretation of field-scale surfactant remediation of an unconfined aquifer contaminated with DNAPLs, dense non-aqueous phase liquids. A three-dimensional, multi-component, multi-phase simulation study was conducted incorporating extensive laboratory and field data. UTCHEM, the University of Texas CHEMical flood simulator, was used to model the aquifer, groundwater, contaminants, and injected chemicals. The primary objective of this research was to develop and apply engineering methods, especially flow and transport modeling, to optimize the removal of contaminants using surfactant enhanced aquifer remediation (SEAR), including the effect and importance of such processes as adsorption, solubilization/mobilization, dispersion/diffusion, gravity, and viscous forces upon remediation efficiency. Partitioning tracer tests were included in the project, both preceding and following the surfactant remediation, to establish the volume of DNAPL present to be remediated and to determine the effectiveness of this process in removing the DNAPL source. Field surfactant floods and tracer tests were conducted at a site in Hill AFB, which allowed validation of the test design methodology, including the value of simulation in this process. The simulations accurately predicted tracer breakthrough times, tracer peak times and concentrations, and performance of the tracer “tail” or concentration decline critical for moment analysis and DNAPL volume determination. The simulations also were critical in determining the appropriate injection and extraction rates, injection concentrations, and time required for each segment of the test. Surfactant was injected successfully in the field, as evidenced by no loss in hydraulic conductivity during the test, low adsorption and high surfactant recovery, a dramatic increase in contaminant production at surfactant breakthrough, and successful treatment of produced fluids by existing facilities. Hydraulic control was designed by tuning rates of injection/extraction/hydraulic control wells and was confirmed in the field results by high recovery of injected chemicals and low concentrations of tracers in monitoring wells north and south of the test area. This field test resulted in 98.5% DNAPL recovery and a reduction in TCE concentration in the produced water from 900 mg/l down to 10 mg/l at the end of the test. Advisors/Committee Members: McKinney, Daene C. (advisor), Pope, G. A. (advisor).

Subjects/Keywords: Aquifers  – Cleaning  – Simulation methods; Groundwater  – Purification  – Simulation methods; Groundwater flow  – Simulation methods; Surface active agents; Dense nonaqueous phase liquids  – Environmental aspects; Aquifers  – Cleaning  – Utah  – Hill Air Force Base; Groundwater  – Purification  – Utah  – Hill Air Force Base

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Brown, C. L. (2004). Design of a field scale project for surfactant enhanced remediation of a DNAPL contaminated aquifer. (Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/1883

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Brown, Chrissi Lynn. “Design of a field scale project for surfactant enhanced remediation of a DNAPL contaminated aquifer.” 2004. Thesis, University of Texas – Austin. Accessed December 18, 2018. http://hdl.handle.net/2152/1883.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Brown, Chrissi Lynn. “Design of a field scale project for surfactant enhanced remediation of a DNAPL contaminated aquifer.” 2004. Web. 18 Dec 2018.

Vancouver:

Brown CL. Design of a field scale project for surfactant enhanced remediation of a DNAPL contaminated aquifer. [Internet] [Thesis]. University of Texas – Austin; 2004. [cited 2018 Dec 18]. Available from: http://hdl.handle.net/2152/1883.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Brown CL. Design of a field scale project for surfactant enhanced remediation of a DNAPL contaminated aquifer. [Thesis]. University of Texas – Austin; 2004. Available from: http://hdl.handle.net/2152/1883

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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