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 20 for “"dye tracer"”.
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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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Examining Pathways for Water Loss from Mountain Lake, Giles County, Virginia
… This study applied hydrologic, geophysical, and dye tracer methods to examine the pathways for water loss and the possible geologic controls on these flow paths. Continuous lake level monitoring data show seasonal trends of draining and filling over a three year period. Electrical resistivity …
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Development of an optical fibre array fluorosensor for monitoring in the aqueous environment.
… g/l for marine phytoplankton in realtime. Using dye tracers in conjunction with the OFAF was also investigated, in particular with a particulate dye tracer whose physical properties can be altered to mimic the target species under investigation. The particulate dye tracer was used in applications …
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Modeling diffusion in the Antarctic circumpolar current
… heated annulus and the evolution of a dye tracer mixed by turbulent motions is studied. Images are analyzed to extract the concentration mappings of tracer throughout the tank at each time instance and a diffusion coefficient K(r) is inferred.
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Rock Outcrops in the Canadian Shield: an Investigation of Contaminant Transport From Surface Sources in Fractured Rock Aquifers
… parameters that affect surface infiltration of a tracer from a rock outcrop to a deeper horizontal fracture. In the water quality study, approximately 65% of the samples contained total coliform, 16% contained E. coli, and 1% contained nitrate-N at greater than 5 mg/L. Occurrence of E. coli …
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Simulation of suspended sediment and contaminant transport in shallow water using two-dimensional depth-averaged model with unstructured meshes
… erent slope-limiter approaches. Furthermore, a dye-tracer study in the Chicago River is simulated for verifying the model in a real-world project. The numerical results show satisfactory matches with the field measurement data. A widely used three-dimensional model EFDC is also used for …
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Analysis of flow patterns and flow mechanisms in soils
… typical flow patterns that can be visualised in dye tracer experiments. To extract quantitative information from dye tracer studies a vast variability of approaches exists. One of them is to describe dye patterns by the so called dye coverage function, i.e. the percentage of stained area per soil …
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Evaluation of transport relative to the tidal mixing front on southern Georges Bank
… Georges Bank program, drogued drifters and dye tracer were released into the pycnocline on the southern flank of Georges Bank to measure advective and diffusive transport relative to the tidal mixing front in May 1999. Potential density measurements placed the tidal mixing front around the …
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Evaluation of transport relative to the tidal mixing front on Southern Georges Bank
… Georges Bank program, drogued drifters and dye tracer were released into the pycnocline on the southern flank of Georges Bank to measure advective and diffusive transport relative to the tidal mixing front in May 1999. Potential density measurements placed the tidal mixing front around the …
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Caracterización hidrodinámica de praderas naturales de macrófitos bentónicos en fondos someros afectados por mareas
… (e.g. acoustic Doppler velocimeter (ADV) and dye tracer measurements) and flume tank experiments. Main results revealed that (1) the flow accelerates over the canopies, being partially explained by submergence conditions, (2) fragmentation of intertidal patches augments horizontal turbulent …
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Improving Design Guidance for In-Stream Structures Used in Stream Restoration
… This was done by using Rhodamine WT dye tracer experiments to determine n values during storm flows in two SPSC structures in Annapolis, MD, which were then compared to predicted n values. Values of Manning's n determined in the SPSCs at low flows (0.28-12) often exceeded the …
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Water flow paths in soils of an undisturbed and landslide affected mature montane rainforest in South Ecuador
… conventional field- and laboratory methods, dye tracer experiments including an appropriate image processing technique, as well as statistical models. Results show that both rock fragment content and bulk density control significantly, but not largely the saturated hydraulic conductivity of …
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Hydrologic Characteristics of Summer Stream Temperatures in Little Creek and Scotts Creek at the Swanton Pacific Ranch
… distributed temperature sensing. A fluorescent dye tracer was used to gather information on summer streamflow including the quantification of residence time and hyporheic exchange. A heat budget approach was used to quantify individual heat flux components and to examine the processes of stream …
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An experimental and theoretical study of the flow about spheres and discs rotating slowly in viscoelastic fluids
… rotating in a 0,9% Natrosol 250 H solution; a dye tracer study of the flow about a sphere rotating in this liquid is presented as well. Velocity profiles are presented for the flow of the 1,50% Natrosol solution about a rotating disc and the flow of the 0,9% solution about a second rotating …
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On the structure of flow in an inclined settling column
… suspension. Fluid velocity was measured by a dye-tracer. From the data, it was seen that the fluid velocities within the suspension were exceedingly high, being roughly 10 times the bulk settling velocity of the suspension . All the characteristics of the flow field within the clear-fluid …
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Field Investigation of Stream-Aquifer Interactions: A Case Study in Coastal California
… sampling, constant rate pumping tests, dye tracer tests, electrical resistivity interrogation of the subsurface, and long-term passive monitoring of aquifer hydraulic heads and stream stage, are reported. Additionally, results of laboratory falling-head permeameter tests and particle …
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Design and Validation of Medical Devices for Photothermally Augmented Treatments
… with the same solvent used in the infused dye tracer. The source is assumed to be spherical and isotropic with constant flow rate and concentration. The Peclet numberdecreases with power function Pe = 15762t0.337 due to the decrease in mean dye-front pore velocity as V goes to Vfinal. …
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Glacier retreat and projected river regime changes in the hydrologically highly-coupled Virkisjökull catchment, SE Iceland
… of ice ablation, proglacial discharge, dye-tracing of flow pathways, and deployment of three automatic weather stations at altitudes up to 880 m. These data calibrate a distributed hydrological model (WaSIM) to project potential river regime during stages of glacier retreat. Results …
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Soil erosion and conservation potential of row crop farming in mountainous landscapes of South Korea
… sprinkler, we irrigated small plots with a dye tracer solution of Brilliant Blue and potassium iodide, collected surface runoff, and excavated soil profiles to visualize the subsurface flow patterns, which were subsequently analyzed by image index functions. We found that the ridge-furrow …
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Flow and transport processes as affected by tillage management under monsoonal conditions in South Korea
… and flow dividers as well as Brilliant Blue FCF tracer experiments. The obtained datasets were used to calibrate the process-based models HYDRUS 2/3D and EROSION 3D in order to quantify drainage water fluxes, surface runoff and erosion rates of RTpm compared to ridge tillage without coverage (RT) …