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 17 of 17 for “"Coastal Aquifers"”.
-
Tide-influenced contaminant transport in coastal aquifers
Coastal aquifers are distinguished from other aquifers because of tidal effects which cause complicated groundwater flow and contaminant transport phenomena in regions immediately adjacent to the coast. This study is designed to address the significance of tidal influence on contaminant transport …
-
Hydrodynamics of Saltwater Intrusion in Heterogeneous Coastal Aquifers
… threat to the livelihood of populations in coastal zones 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 …
-
Seawater circulation in coastal aquifers : processes and impacts
… the subterranean domain of chemical cycling in coastal oceans abutting permeable aquifers, where transport through sediments is dominated by advection, rather than diffusion. We investigate the mechanisms by which seawater circulates in the subsurface over a range of spatio-temporal scales, and …
-
Physical controls on water flow and solute transport in coastal aquifers
… on the structure and productivity of near-shore coastal ecosystems. For proper assessment and management of these coastal groundwater resources, it is quite essential to investigate the key factors (tides, waves, evaporation, and freshwater recharge etc.) affecting coastal groundwater systems. …
-
The use of subsurface physical barriers to control seawater intrusion in heterogeneous coastal aquifers: experimental and numerical study
… intrusion in multi-layered heterogeneous aquifers. The sixth chapter provides and insight on the impact of layered heterogeneity on the ability of subsurface dams to control seawater intrusion. The seventh chapter demonstrates the viability of the MPB and compares its effectiveness to …
-
Assessing Aquifer Vulnerability to Seawater Intrusion : Application of the GALDIT-Index to the Emilia-Romagna Coastline.
Saltwater intrusion (SWI) in coastal aquifers due to excessive groundwater withdrawals (for civil, agricultural and industrial purposes) has become a major concern affecting a large number of coastal aquifers worldwide. This trend is expected to grow in the very near future due to the expected …
-
Biodiversity assessment of groundwater-dependent ecosystems in Malta : evaluating copepods as bioindicators of groundwater health
… presence across three groundwater bodies, two coastal aquifers and one perched, however a clear indication of which physicochemical factors affect their presence was not concluded. Presence of copepods was strongly linked to coastal aquifers, and collection methods could influence the …
-
Intrusão salina em aquíferos costeiros: uma análise pelo Método de Elementos de Contorno
… Intrusion can result from excessive pumping in coastal aquifers and causes increase in salinity of groundwater at a given location. The boundary element method is formulated for and applied to problems concerning a moving interface between fresh water and salt water in porous media. The model is …
-
Risk analysis and mitigation of seawater intrusion for the Gaza strip coastal aquifer under climate induced changes
Coastal aquifers are in hydraulic contact with the sea; prolonged overpumping of groundwater can lead to inland encroachment and/or vertical up-coning of the interface (transition or mixing zone) between these regimes, causing salt contamination of freshwater aquifers. In the Mediterranean area, …
-
Fluid and Pressure Dynamics in Natural and Engineered Coastal Aquifer Systems
Coastal aquifers are increasingly impacted by groundwater depletion, seawater intrusion, and land subsidence driven by long-term pumping. This dissertation uses 3D numerical modeling to evaluate how variable-density flow and geological heterogeneity influence pressure response, intrusion geometry, …
-
Barrier island groundwater dynamics
… along the U.S. Atlantic and Gulf Coasts and coastal groundwater dynamics influence the availability of freshwater, ecosystem health, pollutant transport, and flooding in these densely populated communities. However, groundwater dynamics, including the aquifer head distribution and subsurface …
-
Barrier Island Groundwater Dynamics
… along the U.S. Atlantic and Gulf Coasts and coastal groundwater dynamics influence the availability of freshwater, ecosystem health, pollutant transport, and flooding in these densely populated communities. However, groundwater dynamics, including the aquifer head distribution and subsurface …
-
Seasonal dynamics in costal aquifers : investigation of submarine groundwater discharge through field measurements and numerical models
The fresh and saline groundwater flowing from coastal aquifers into the ocean comprise submarine groundwater discharge (SGD). This outflow is an important pathway for the transport of nutrients and contaminants, and has been shown to adversely affect coastal ecosystems in many areas of the world. …
-
Modeling injection and extraction wells for seawater desalination in SEAWAT
… enter the system. Subsurface systems leverage coastal aquifers as natural filters, increasing the effective flow field for seawater extraction and brine disposal, and are proven to reduce impacts on the coastal environment. In this study, we developed groundwater models in SEAWAT, a …
-
The design and testing of a procedure to locate fresh submarine groundwater discharge in Cyprus
… (SGD) in Cyprus. SGD is a flow of water from coastal aquifers into the ocean driven by a hydraulic gradient and other forces. Understanding SGD is crucial for informed groundwater management. In some cases, SGD creates submarine springs which can be tapped to provide supplementary freshwater. …
-
Influence of beach hydrodynamics on saltwater transport and oil persistence in beaches
… the fundamental processes occurring in beach aquifers. It explores the effects of buoyancy (or lack thereof) on the flushing of freshwater to sea. The results indicate that the increase in water pressure when freshwater inundates saltwater systems exceeds the pressure obtained assuming the …
-
Measurement of Soil and Water-Quality Parameters to Understand Subsurface Transport Processes
… focus on managing freshwater resources in island aquifers. As part of this effort, we used a combination of laboratory experiments and numerical simulations to study the impacts of changes in rainfall patterns on saltwater intrusion dynamics. In the second phase of this study, we have focused on …