Modeling Drought, Drought Teleconnection, and its Effect on Groundwater Level Dynamics in the Biscayne Aquifer
Doctor of Philosophy (PhD)
Earth Systems Science
First Advisor's Name
Assefa M. Melesse
First Advisor's Committee Title
Second Advisor's Name
Second Advisor's Committee Title
Third Advisor's Name
Third Advisor's Committee Title
Fourth Advisor's Name
Fourth Advisor's Committee Title
Groundwater Model, Drought, Teleconnection, Inverse modeling, Biscayne Aquifer, Everglades, Hydrology
Date of Defense
Developing a self-sufficient water supply system in Southeast Florida is one input to the success of the ongoing restoration effort in the Everglades. Maintaining a high groundwater level in the urban side of the Biscayne Aquifer (BA) is important to sustain the urban water supply. However, the long-term groundwater table condition in the Biscayne Aquifer (BA) is threatened by a combination of drought, groundwater pumping, and sea-level rise. Further, the long-term drought pattern, drought drivers, and the aquifer’s response to drought and other stress conditions are not well known. As a result, options that would help to maintain a high groundwater table condition in the urban section of the aquifer without being dependent on recharge from the Everglades water are not outlined. In this study, long-term drought and the causes of drought variability in the area, the effect of drought on the groundwater table condition, and the contribution of potential groundwater management options are assessed. The study results indicated that the drought in Southeast Florida was driven by a combination of ENSO fluctuation (short-term drought variability) and AMO fluctuation (long-term drought variabilities). Since the early 1990s, the area has been receiving rainfall higher than the long-term average (by 16%). The combination of higher rainfall in August and lower rainfall in May and October results in uni-modality in the previously bi-modal rainfall regime in Southeast Florida. By modeling the groundwater table dynamics in the BA, we found that drought, causing groundwater recharge limitation and a decline of surface water stag in canals, has a regional influence on the position of the groundwater table. Sea-level rise and groundwater pumping have a more substantial impact over the groundwater table in the coastal region and close to the well-field areas, respectively. Given that drought has a regional influence over the groundwater table, its effect on long-term freshwater availability is sizeable. Application of a hypothetical artificial recharge zone in the western margin of the model domain indicated a promising potential to mitigate the groundwater table decline attributed to drought and pumping pressure. However, the feasibility of the recharge zone must be studied further.
Previously Published In
Abiy, A.Z., Melesse, A.M., Abtew, W. and Whitman, D., 2019. Rainfall trend and variability in Southeast Florida: Implications for freshwater availability in the Everglades. PloS one, 14(2).
Abiy, A.Z., Melesse, A.M. and Abtew, W., 2019. Teleconnection of Regional Drought to ENSO, PDO, and AMO: Southern Florida and the Everglades. Atmosphere, 10(6), p.295.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Abiy, Anteneh Z., "Modeling Drought, Drought Teleconnection, and its Effect on Groundwater Level Dynamics in the Biscayne Aquifer" (2020). FIU Electronic Theses and Dissertations. 4530.
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