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 19 of 19 for “"tracer test"”.
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Density and recharge effects during the Cape Cod natural-gradient tracer test
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Simulating water tracer test in naturally fractured reservoirs using discrete fracture and dual porosity models
… model. Another feature of this thesis is tracer testing. In this process, a chemical or radioactive element is injected to the reservoirs, and then it can be traced using the devices, which are designed to detect the tracers. Tracer tests have several advantages such as determining …
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Ground-penetrating radar images of a dye tracer test within the unsaturated zone at the Susquehanna-Shale Hills CZO
Dye tracer and time-lapse ground-penetrating radar (GPR) were used to image preferential flow paths in the shallow, unsaturated zone on hillslopes in two adjacent watersheds within the Susquehanna-Shale Hills Critical Zone Observatory (CZO). At each site we injected about 50 L of water mixed with …
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INFLUENCE OF ADSORPTION AND OXYGEN LIMITED BIODEGRADATION ON THE TRANSPORT AND FATE OF A CREOSOTE PLUME: FIELD METHODS AND SIMULATION TECHNIQUES (HYDROCARBON, GROUNDWATER, MODELING, TRACER TEST)
… adsorption and biodegradation. A series of field tests and computer simulations were performed to identify which processes were limiting the transport of the hydrocarbon. A seven day injection-production test was performed in the shallow semi-confined aquifer at the site and clearly demonstrated …
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Comparison Of Denitrification Potential Around A Tile Drain And In Aquifer Sediments: Oakes, ND
… (BMP) site, within the Oakes Irrigation Test Area (OITA) near Oakes, North Dakota.</p> <p>For the aquifer sediment study, sediment samples (n=43) were collected from 10 locations at the BMP site. All samples were analyzed for the following potential electron donors: organic carbon, …
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Characterization of a hydraulically induced bedrock fracture
… multi-faceted approach consisting of aquifer and tracer testing is used to estimate the transmissivity and storage coefficient of a hydraulically induced fracture and observe its behavior as a contaminant flow pathway. The results of the aquifer tests indicated a decrease in both the …
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Investigating the Impact of Aquifer Long Term Replenishment on the Potomac Aquifer System in Virginia
… system. This work uses injectate as an intrinsic tracer, an in-situ flowmeter, and a bromide tracer test to evaluate how flow is distributed through the eleven screens in the recharge well and to assess how flow distribution changes over time. Typically, flow distribution in multi-screen wells is …
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On Single Well Forced Gradient Tracer Tests: Implications of Aquifer Physical Heterogeneity and Tracer Behaviour
Single well forced gradient tracer tests are a potential cost-effective approach to estimate in situ aquifer contaminant fate and transport parameters for use in natural attenuation assessments and remediation schemes. To date dipole flow tracer tests have been used to measure the conservative and …
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Investigations of water and tracer movement in covered and uncovered unsaturated waste rock
… with the covered surface. Data from a deuterium tracer test, lysimeter outflow, and from TDR probes were used to derive estimates of the maximum and an average pore water velocity through the uncovered and the covered waste rock. An average pore water velocity through the matrix materials of the …
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Numerical modelling of the shallow reinjection and tracer transport at Nesjavellir Geothermal System, Iceland : an assessment of heat transfer and fluid flow
… were further calibrated against data from a tracer test carried out in the area between 2018-2019. Both models use the Multiple Interactive Continuum (MINC) method, which is a generalization of the dual-porosity method. Compared to the single-porosity model, the MINC method better replicates …
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Technology for Planar Power Semiconductor Devices Package with Improved Voltage Rating
… is presented. The fabricated modules are tested by using a high power curve tracer. Test results verify the proposed method. 5. Simplification of the structure model of the proposed device package The package structure model is simplified through the elimination of power semiconductor …
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The transport and reaction behavior of arsenic in groundwater : experiments and case studies
… and release of arsenic. A continuous injection tracer test was conducted at the USGS Cape Cod research site (Mass.,USA) in order to investigate natural reduction of As(V) to As(III) in an iron reducing environment. As(V) reduction was observed to take place under the conditions of this aquifer. …
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Monitoring water and pollutant leaching at an industrial site using geophysics and a vadose zone monitoring system.
… to such initial monitoring period, a saline tracer test was infiltrated on site and monitored via surface, cross-borehole ERT methods and the VMS to simulate the transport of a contaminant across the vadose zone. Results from a short term monitoring period (5 days) reveal the formation of a …
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Feasibility study of sedimentary enhanced geothermal systems using reservoir simulation
… are identified and investigated. An analytical tracer test model proposed by Shook (2000) is numerically modeled. This model allows us to predict the time when the temperature of the produced water decreases by capturing a tracer component at production well. Reservoir simulation models with …
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Understanding The Factors Influencing Contaminant Attenuation And Plume Persistence
… feasibility of MNA/EA. Contaminant elution and tracer (CET) tests have been proposed as one such advanced method. Another objective of this study is to investigate the use of modified well-field configurations to enhance the performance of CET tests to collect critical site-specific data that …
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PERMEABILITY AND MOISTURE DAMAGE CHARACTERISTICS OF ASPHALT PAVEMENTS
… not exhibit moisture damage. Field permeability testing is conducted on those 16 pavements. Results show that good performing pavements have very low (field) permeability compared to the bad performing pavements, which was expected. Field coring is conducted and cores are collected from all 16 …
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Groundwater-surface water exchange within montane and alpine regions of the Front Range and Rocky Mountains, Colorado
… over 15 years, while multiple stream tracer tests were performed in the Gordon Gulch catchment in the Boulder Creek Critical Zone Observatory. These tracer tests were paired with time-lapse electrical resistivity and modeled using OTIS to examine how solute transport and storage …
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Kinetics of the electrocoagulation of oil and grease
<p>Research on the electrocoagulation (EC) of hexane extractable materials (HEM) has been conducted at the University of New Orleans using a proprietary bench-scale EC reactor. The original reactor configuration forced the fluid to follow a vertical upward-downward path. An alternate electrode …