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 20 of 701 for “"aquifer"”.
-
Aquifer Framework Restoration (AFR) in an Alluvial Aquifer, Central Texas.
The Brazos River Alluvium aquifer (BRAA) near Waco, Texas is an aquifer whose framework has been physically impacted by sand and gravel mining. The most productive portions of the BRAA framework are being excavated and kept as pit lakes or filled with different material. GIS identification of mined …
-
Investigating the Impact of Aquifer Long Term Replenishment on the Potomac Aquifer System in Virginia
… in the potentiometric surface in the Potomac Aquifer System (PAS). With water levels falling, communities are at risk of wells running dry, saltwater intrusion, and land subsidence. The Sustainable Water Initiative for Tomorrow (SWIFT) project is an aquifer long-term replenishment (ALTR) …
-
Modelling aquifer thermal energy storage systems
Aquifer thermal energy storage systems can decarbonise space heating and cooling, provide large-scale long-term storage and buffer the seasonal mismatch in supply and demand. In the winter, the system provides a heat source by extracting warm water from a subsurface reservoir. The extracted fluid …
-
Modeling karst aquifer response to rainfall
… conductivity and potential gradient in a karst aquifer system. Rainfall excess in the form of potential energy from sinkhole sub-basins is input to element nodes and routed through a one-dimensional finite-element mesh to the karst spring represented by the last node in the finite element mesh. …
-
Modelling of atrazine migration in Laune aquifer
Tutkielman tavoitteena oli tutkia kasvinsuojeluaine atratsiinin kulkeutumista Launeen pohjavesialueella Lahdessa mallinnuksen keinoin käyttäen MODFLOW-ohjelman pohjaveden virtausmallia M3TD -kulkeutumistyökalun kanssa. Atratsiinin kulkeutumisen tutkimiseksi koostettiin kolme eri mallia. …
-
Recharge dynamics of a perched phreatic aquifer
… timing, and mechanisms for a perched, phreatic aquifer. Recharge rates were estimated using fluid mass balance (FMB), integrated hydrograph separation (IHS), and innovative hydrograph manipulation techniques. Timing and mechanisms of recharge were analyzed using signal-processing and …
-
Energy Flow in a Floodplain Aquifer Ecosystem
… community of a large 20 km2 floodplain aquifer, based on biomass distributions, organismal respirometry, in situ community respiration, mesocosm and microcosm experiments, stable isotopes and invertebrate gut contents. The invertebrate respiration scaling exponent was 0.474 (+/- 0.068, …
-
Energy Flow in a Floodplain Aquifer Ecosystem
… community of a large 20 km2 floodplain aquifer, based on biomass distributions, organismal respirometry, in situ community respiration, mesocosm and microcosm experiments, stable isotopes and invertebrate gut contents. The invertebrate respiration scaling exponent was 0.474 (+/- 0.068, …
-
Digital Simulation of a Stream-Aquifer System
Made available in DSpace on 2014-12-11T18:09:49Z (GMT). No. of bitstreams: 1 7105167.pdf: 2608987 bytes, checksum: 798192185753e97b50cc0520e729aa7e (MD5) Previous issue date: 1970
-
Sorption of chlorinated solvents in a sandy aquifer
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
-
A Three-dimensional Model of Poroviscous Aquifer Deformation
… model is developed for quantification of aquifer deformation due to ground-water withdrawal and, with some modifications, is potentially applicable to petroleum reservoirs. A porous medium saturated with water is conceptually treated in the model as a nonlinearly viscous fluid continuum. …
-
Aquifer Characterization in the Blue Ridge Physiographic Province
… and porous regolith with a water-table aquifer that slowly supplies water downward to the underlying variably fractured crystalline bedrock. In these models, interconnected fractures in the crystalline bedrock act as conduits for predominantly downward vertical and limited horizontal …
-
Process Modeling of Trihalomethanes During Aquifer Storage and Recovery
Aquifer storage and recovery has been used to meet consumer demand, particularly in the southwestern United States, by injecting treated water underground during wet periods and recovering water during dry periods. Trihalomethanes are the most common disinfection by-products found in chlorinated …
-
Cyclic irrigation of turfgrass using a shallow saline aquifer
… the long-term effects of applying shallow saline aquifer water to two turfgrass sports fields. The water (0.69-- 3.4 dSm-1) was applied using cyclic irrigation during peak demand months (May--Oct). Treatments consisted of cycling saline water through the existing irrigation systems. Saline …
-
Laboratory denitrification using sediments from the Elk Valley Aquifer
… the laboratory using sediments of the Elk Valley Aquifer in eastern North Dakota. The experiment entailed analyzing sediments for sulfides and solid organic carbon and isolating them in sample containers with a nitrate solution to determine if a measurable decrease in these components could be …
-
Denitrification in the Elk Valley aquifer, northeastern North Dakota
… controls nitrate distribution in the Elk Valley aquifer, which underlies approximately 725 square kilometres of northeastern North Dakota and provides drinking water for farms and rural communities in the area. Increased irrigation has raised concerns over potential contamination from …
-
Microbial diversity and groundwater chemistry in a pristine aquifer
The Mahomet aquifer, a pristine water resource spanning much of central Illinois, is home to a diverse ecosystem of bacteria and archaea. We examined this microbial community at 18 wells across the aquifer by filtering cells suspended in groundwater and trapping sediment-bound populations on …
-
Optimal parameter sampling for aquifer remediation design under uncertainty
In restoring polluted aquifers by hydraulic means, the parameters that characterize the aquifer are rarely known with certainty. To address this uncertainty, one may conservatively design the remediation system, so that the probability of failure to restore the aquifer is small. Alternatively, one …
-
Data center cooling using Aquifer Thermal Energy Storage (ATES)
… Magnetic bearing chillers (MBC) and MBC + aquifer thermal energy storage (ATES) against a conventional water-cooled centrifugal chiller plant with CRAH units for mid-sized data centers. Hourly cooling-energy and cost simulations were performed for the City of Phoenix, Arizona, and the City …
Page 1 of 36