Doctor of Philosophy (PhD)
Earth Systems Science
First Advisor's Name
First Advisor's Committee Title
Second Advisor's Name
René M. Price
Second Advisor's Committee Title
Third Advisor's Name
Assefa M. Melesse
Third Advisor's Committee Title
Fourth Advisor's Name
Pete E. Markowitz
Fourth Advisor's Committee Title
Environmental indicators and impact assessment, environmental monitoring, geology, geophysics and seismology, natural resources and conservation, hydrology
Date of Defense
Coastal groundwater aquifers are susceptible to saltwater intrusion from natural and anthropogenic sources. Everglades National Park (ENP) has been adversely impacted by past human activities that altered freshwater flow through the system. In Big Pine Key (BPK), the flat and low-lying topography less than 2m makes the freshwater lens vulnerable to tidal and storm surge events. This study investigated different inversion scenarios and used Electrical Resistivity Tomography (ERT) and Electromagnetic (EM) survey to characterize the spatial and temporal change of the groundwater chemistry and image the aquifers. In Big Pine Key, Hurricane Irma made landfall as a category 4 storm with storm surge heights in excess of 2 m. The study compared ERT images along three profiles ranging between 220 and 280 m length collected in 2011 with post-storm data collected about 3 to 4 months (November 2017/January 2018) and 8 to 11 months (May/December 2018) after Irma. The post-storm data documented that the storm surge impacted the freshwater lens on all three profiles with low resistivity (i.e., high salinity) zones in the upper 2 m. These data showed 40 and 70 % recovery of the freshwater lens in May and December 2018 and most pronounced in the lower elevation of the profiles.
In the Mangrove lakes of the Everglades, a constrained water depth (fixed water layer thickness) inversion model is selected as an effective inversion approach. In our study, we estimated a formation factor 10.7 with a standard deviation of 1.81 by comparing the bulk resistivity measured using a floating Dipole-Dipole array and coincident conductivity data from the wells. Between, 2016 to 2019, the spatial salinity variation on the lakes showed west to east increase in surface water salinity and west to east decrease in groundwater salinity. In addition, the salinity of the surface water and groundwater increased from North to South and suggested freshening of the groundwater and may reflect the effects of increased flow caused by restoration efforts.
Previously Published In
Kiflai, M.E., Whitman, D., Ogurcak, D.E. et al. The Effect of Hurricane Irma Storm Surge on the Freshwater Lens in Big Pine Key, Florida using Electrical Resistivity Tomography. Estuaries and Coasts 43, 1032–1044 (2020). https://doi.org/10.1007/s12237-019-00666-3
Kiflai, Michael Eyob, "Hydrogeophysical Characterization and Imaging in the Mangrove Lakes Region of Everglades National Park and Big Pine Key, Florida, USA" (2020). FIU Electronic Theses and Dissertations. 4475.
Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Geology Commons, Geophysics and Seismology Commons, Hydrology Commons, Natural Resources and Conservation Commons
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