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.
Results
Showing 1 to 14 of 14 for “"Aquifer heterogeneity"”.
-
Interpretation of two-dimensional characteristics of stochastic fractal aquifer heterogeneity models from one-dimensional sampling
Includes bibliographical references (pages 155-160).
-
Assessing surface and groundwater interactions between the middle Brazos River Alluvium Aquifer and the Brazos River.
The Brazos River Alluvium Aquifer (BRAA) is a vital source of water in Central Texas, primarily used for irrigation. The BRAA and the overlying Brazos River are connected; however, their interaction is not well understood and often overgeneralized. This study seeks to clarify aspects of surface …
-
Heterogeneity effects on flow and transport within a shallow fluvial aquifer
The effects of aquifer heterogeneity on flow and transport are considered numerically at two scales using high resolution groundwater models. Heterogeneity effects on river loss were evaluated at the kilometer scale using stochastic, geostatistical models with grid cells on the order of several …
-
Determining capture zones for three-dimensional, heterogeneous, anisotropic aquifers by Monte Carlo analysis
… protection assume a two-dimensional, homogeneous aquifer. Aquifers, however, are three-dimensional and heterogeneous, thereby introducing uncertainty in capture zone analysis. This study used a Monte Carlo analysis of three sets of statistical parameters defining aquifer heterogeneity. Each set …
-
Uranium isotopes as indicators of uranium immobilization and remobilization in contaminated aquifer settings
… alone is challenging, as groundwater transport, aquifer heterogeneity, and U(VI) adsorption can complicate data interpretation. U isotopes (238U/235U) provide a more direct indicator of these geochemical reactions controlling U mobility. U(VI) reduction induces a strong fractionation of U …
-
Bayesian model averaging on hydraulic conductivity estimation and groundwater head prediction
Characterization of aquifer heterogeneity is inherently difficult because of the insufficiency of data, the inflexibility of parameterization methods, and non-uniqueness of parameterization methods. Groundwater predictions are greatly affected by multiple interpretations of aquifer properties and …
-
Use of hydraulic tests to identify conceptual models of heterogeneity for fractured rock aquifers
Important aquifers, petroleum reservoirs, geothermal reservoirs, and waste disposal sites throughout the world are located in fractured rock formations. Responsible management of these resources and sites requires appropriate field characterization studies and modeling techniques to assess the …
-
Assessment of scaling and information requirements of the classical advection dispersion equation and a temporal-nonlocal advection dispersion equation at the MADE site, An
… generate a high resolution $K$ domain of the aquifer material and was spatially upscaled (averaged) to examine transport model capabilities while destroying $K$ information. Two models were compared at a range of $K$ domain resolutions, the ADE and a temporal-nonlocal advection dispersion …
-
Assessment of scaling and information requirements of the classical advection dispersion equation and a temporal-nonlocal advection dispersion equation at the MADE site, An
… generate a high resolution $K$ domain of the aquifer material and was spatially upscaled (averaged) to examine transport model capabilities while destroying $K$ information. Two models were compared at a range of $K$ domain resolutions, the ADE and a temporal-nonlocal advection dispersion …
-
Hydrodynamics of Saltwater Intrusion in Heterogeneous Coastal Aquifers
… who are dependent on freshwater extracted from aquifers near to the sea. The sustainable management of coastal aquifers is crucial to prevent the degradation of freshwater resources by the landward intrusion of saltwater due to over-pumping and climate change. Difficulties arise when modelling …
-
Altersbetrachtung und numerische Simulation zu Möglichkeit und Grenzen einer prozessorientierten Kontrolle (Frühwarnsystem) der Bewirtschaftung tiefer Grundwässer
… of near-subsurface pollutants towards greater aquifer depths is enhanced in such a way that (a) it remains unnoticeable to standard water quality monitoring for a good number of years, and (b) by the time it is perceived by standard monitoring instruments, it has already affected depths and …
-
The influence of surface - subsurface connectivity on groundwater flow and solute transport in a deltaic aquifer
… processes in the analysis of deltaic aquifers could help us better understand groundwater flow and solute transport, enhancing groundwater management strategies for these regions. ☐ Establishing a correlation between static (stratigraphic) and dynamic (flow and transport) connectivity …
-
Hydrogeology and Simulated Water Budget of the Rio Cobre and Rio Minho-Milk River Basins, Jamaica, West Indies
… during the Laramide Orogeny. The White Limestone aquifer is the principal aquifer of the Rio Cobre and Rio Minho-Milk river basins in the parishes of St. Catherine, Clarendon, and partly in Manchester. It is characterized by intercalated sequences of permeable rubbly and micritic carbonate rocks. …
-
Three essays on the economics of water management in agriculture
… imposed on groundwater flow rates by underlying aquifer characteristics. I find that limitations on the instantaneous supply of groundwater can affect irrigation decisions nonlinearly with a threshold effect. A profit-maximizing farmer with maximum available water flow rate below the threshold …