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 57 for “"Vadose Zone"”.
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A Vadose Zone Field Study: Subsurface Tile Drainage, Hydrology, and Variablity
Results include an analysis of the water balance components over periods bounded with similar satiated moisture storage conditions. The field site was found to have an excess storage during most periods which is partially explained by the atmospheric ET models underpredicting evaporation during …
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Vadose Zone Hydrology near the Vicinity of Edna's Dome, Mammoth Cave, Kentucky
This study examines the differences in key physical aqueous parameters at two different cave sites separated by only a few tens of meters. One site (FF) has a freefalling water component where water descends nearly 30 meters from the ceiling of a vertical shaft. The other location (WW) appears to …
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Parameter Importance of an Analytical Model for Transport in the Vadose Zone
… was conducted on an analytical model for vadose zone transport. It was found that for sites posing high risk, with large spill volumes and shallow water table depths, the input parameters of water table depth and spill volume were the most important. The input parameters of precipitation …
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Modeling Spatial Variability of Field-Scale Solute Transport in the Vadose Zone
… flow of water and chemicals in the unsaturated zone. Incorporating intrinsic soil variability and extrinsic variability into root zone leaching models will provide a better representation of pollutant distribution in natural field conditions. In this study, a stochastic framework (SF) was …
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Simulations of subsurface multiphase flow including polymer flooding in oil reservoirs and infiltration in vadose zone
… models to model the ground water infiltration in vadose zone. One is Richard’s Equation (RE) model. And the other is two-phase flow model. In this work, we compare the two-phase model with an RE model to ascertain, under common scenarios such as infiltration or injection of water into initially …
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Monitoring water and pollutant leaching at an industrial site using geophysics and a vadose zone monitoring system.
… the retrieval of such information across the vadose zone is challenging, as most field technologies have limited accessibility beyond the first meters of subsoil and industrial environments pose additional technical difficulties for installation. The research presented here aims to provide …
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Field evaluation of vadose zone purification and the effects of applied wastewater quality and hydraulic loading rate
Includes bibliographical references (pages 145-147).
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Water Transport in the Vadose Zone and Hydrological Processes in Soil-Plant-Atmosphere Continuum (SPAC) in West Texas, USA
Water and energy transport in the vadose zone is critical in linking the atmosphere and groundwater system, which plays an important role in the terrestrial hydrological cycle. Although numerous studies have been conducted, the comprehensive understanding of the soil-plant-atmosphere continuum …
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Linkages between fluid flow paths, reactive gases, and chemical weathering across a shale bedrock hillslope
While the vadose zone is hypothesized to be an active region of solute generation, direct observations to verify this is lacking. Here, we report an integrated approach to characterize chemical weathering reactions in the vadose zone using a novel Vadose Monitoring System (VMS) installed at the Eel …
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In situ characterization and quantification of phytoremediation removal mechanisms for naphthalene at a creosote-contaminated site
… at this site are biodegradation in the saturated zone, volatilization and biodegradation in the vadose zone and phytovolatilization. This is probably the most comprehensive field study of PAH phytoremediation mechanisms conducted to date. The significance of this research is to contribute to …
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A Numerical and Statistical Analysis of the Fractured Rock Aquifer System in Ploemeur, France to Quantify Local and Regional Recharge
… associated with the extent to which the vadose zone affects groundwater movement and the highly heterogeneous nature of the aquifer systems being monitored. The difficulty surrounding recharge quantification is compounded when considering a fractured rock aquifer system, where …
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Numerical evaluation and analysis of the occurrence of earth fissures in faulted sedimentary basins
… fault-fissure connection, a thick caliche-rich vadose zone with weak mechanical strength allows for the initiation and propagation of fissures. The numerical analysis a) investigates the geometrical and hydromechanical features of the zone of influence surrounding the Eglington Fault; b) …
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NAPL remediation by vacuum-enhanced recovery: Laboratory and model evaluations
… non aqueous phase liquids (NAPLs) in the vadose zone. The first paper demonstrates the use of a pilot-scale two-dimensional laboratory soil cell and an automated dual-energy gamma ray attenuation system for the feasibility assessment of VER to remediate free-product NAPL spills. The …
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Nonequilibrium Phenomena in Multiphase Flow, Transport, and Phase Change in Porous Media: Pore-Level Physics, Network Modeling, and Upscaling
… environmental and energy applications, including vadose zone contaminant transport and shale oil and gas production. Understanding these complex physical processes requires quantitative modeling approaches across scales---from pore-scale (e.g., nanometer to millimeter), to …
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Diagenetic controls of reservoir quality in the Mississippian Wayne Beds in the Williston Basin, Bottineau County, North Dakota
… and minor cementation occurred in the freshwater vadose zone. Freshwater phreatic diagenesis resulted in mineralogical stabilization and minor cementation. Compaction, pressure solution, dolomite and calcite cementation, and anhydritization occurred in the burial diagenetic environment. </p><p> …
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Denitrification and organic carbon in a series of riparian buffers in the Bear Creek National Demonstration Watershed
… from the surface, throughout the rest of the vadose zone, at the border with fluctuating groundwater conditions evidenced by mottling, throughout the mottled zone, and at the border with impermeable till. Surface samples were higher than all other samples. Vadose zone samples were …
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Landslide susceptibility mapping through enhanced dynamic slope stability analysis using earth observing satellite measurements
… slope stability model that directly includes vadose zone soil moisture can produce promising landslide susceptibility maps at regional scale using either VIC-3L or AMSR-E soil moisture. Vadose zone soil moisture has a significant role in shallow slope failure. Results show promising agreement …
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Origin of Uranium Mineralization at Coles Hill Virginia (USA) and its Natural Attenuation within an Oxidizing Rock-Soil-Ground Water System
… Hill uranium deposit and associated weathered zone constrains processes leading to the natural attenuation of uranium within an oxidizing, fluid rich environment typical of the eastern US. At the Coles Hill deposit fracture hosted, primary U(IV) bearing mineral assemblages formed during …
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Characterisation of sedimentary structure and hydraulic behaviour within the unsaturated zone of the Triassic Sherwood Sandstone aquifer in North East England
… investigation of moisture migration in the vadose zone at a single field site. Sedimentary structure and likely permeability variations were studied by use of laboratory grainsize analysis, logging of nearby outcrops, borehole geophysics and Ground Penetrating Radar (GPR). GPR is ideal for …
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