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Use Of Regional Scale Field And Modelling Methods To Evaluate Nearshore Groundwater Discharge To A Large Glacial Lake, Hayley A. Wallace Ms.
Use Of Regional Scale Field And Modelling Methods To Evaluate Nearshore Groundwater Discharge To A Large Glacial Lake, Hayley A. Wallace Ms.
Electronic Thesis and Dissertation Repository
Groundwater discharge may be an important pathway for delivering pollutants to large lakes, but this pathway is poorly understood. Understanding the potential for groundwater discharge to deliver pollutants to lakes requires an evaluation of the magnitude and spatial variability of groundwater discharge to the lake, and the history of the discharging groundwater. The first objective of this thesis was to evaluate and quantify the spatial variability of groundwater discharge to a large glacial lake, Lake Simcoe, Ontario, using the naturally occurring radon isotope tracer (222Rn). Regional scale boat surveys were conducted along 80% of the Lake Simcoe shoreline …
Influence Of Waves On Groundwater Flows And Geochemistry In A Sandy Nearshore Aquifer: A Combined Field And Modelling Study, Spencer S. Malott
Influence Of Waves On Groundwater Flows And Geochemistry In A Sandy Nearshore Aquifer: A Combined Field And Modelling Study, Spencer S. Malott
Electronic Thesis and Dissertation Repository
Waves are known to influence the flux of pollutants to coastal waters via groundwater discharge. This study combines field measurements with numerical groundwater modelling to evaluate the influence of a period of intensified wave conditions (wave event) on nearshore groundwater flows and geochemistry in a sandy freshwater beach. Comprehensive vertical nested pressure transducer data obtained over a 2.5 day isolated wave event reveal the development of transient groundwater flow recirculations through the nearshore aquifer combined with enhanced water exchange across the sediment-water interface (i.e., beach face). The wave-induced groundwater flows were simulated in FEFLOW using a phase-averaged wave setup approach …
Effect Of Groundwater-Lake Interactions On The Distribution Of Arsenic In A Freshwater Beach, Jacky Sk Lee
Effect Of Groundwater-Lake Interactions On The Distribution Of Arsenic In A Freshwater Beach, Jacky Sk Lee
Electronic Thesis and Dissertation Repository
This thesis presents field measurements and numerical modeling that provide insight into the nearshore geochemical conditions and groundwater flows controlling the mobility of arsenic (As) in a freshwater beach aquifer and its potential discharge to Lake Erie. Field measurements were performed via shore-normal monitoring transects installed at beaches (Little Beach and Main Beach) located adjacent to a brownfield industrial harbour site that has elevated sediment and groundwater As concentrations. Detailed pore water chemistry analyses revealed elevated As (up to 0.056 mg/L) 1 - 2 m below the shoreline at all transect locations. The distributions of species in the aqueous and …