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Hydrogeochemical analysis of processes through modeling of seawater intrusion impacts in Biscayne Aquifer water quality, USA

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doi: 10.1007/s10498-016-9287-1
Authors:Habtemichael, Yonas T.; Fuentes, Hector R.
Author Affiliations:Primary:
Florida International University, Department of Civil and Environmental Engineering, Miami, FL, United States
Volume Title:Aquatic Geochemistry
Source:Aquatic Geochemistry, 22(3), p.197-209. Publisher: Springer, Dordrecht, Netherlands. ISSN: 1380-6165
Publication Date:2016
Note:In English. 43 refs.; illus., incl. 2 tables, sketch map
Summary:Hydrogeochemical processes that accompany seawater intrusion in coastal aquifers can alter the resulting water quality and are important ingredients in coastal aquifer management. The presence of dissolution-precipitation reactions and ion exchange in the mixing zone of the Biscayne aquifer (FL, USA) are suggested based on changes in major ion concentrations and mineral saturation indices (SI). Major ion concentrations from 11 groundwater samples are compared with theoretical mixing between freshwater and seawater. PHREEQC code was used to calculate saturation indices of the samples with respect to common phases in the Biscayne aquifer. High Ca2+ and HCO3- content of the samples is typical of waters in contact with carbonate aquifers. Water quality of the samples is mainly attributed to mixing and precipitation-dissolution reactions with calcite and dolomite. The samples were saturated with calcite (SI ≈ 0) and undersaturated for dolomite (SI < 0), while a few samples showed dolomite saturation. Because gypsum and halite SI could be predicted by theoretical mixing, reactions with those minerals, if present, are thought to be insignificant. In the active intrusion areas, cation exchange also appears to modify water quality leading to excess Ca2+, but depleted Na+, Mg2+ and K+ concentrations. On the other hand, samples from previous intrusion areas plotted very close to the theoretical mixing line and approached equilibrium with the seawater. Copyright 2016 Springer Science+Business Media Dordrecht
Subjects:Aquifers; Carbonate ion; Fresh water; Geochemistry; Ground water; Hydrochemistry; Ion exchange; Precipitation; Salt water; Salt-water intrusion; Sea water; Solution; Water quality; Water-rock interaction; Atlantic Coastal Plain; Biscayne Aquifer; Broward County Florida; Florida; Miami-Dade County Florida; United States; Mixing zone
Coordinates:N252200 N260000 W0801000 W0803000
Record ID:778335-2
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany
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