Empirical relationships of groundwater head–salinity response to variations of sea level and vertical recharge in coastal confined karst aquifers

Coastal aquifers are characterized by a mixing zone with freshwater–saltwater interactions, which have a strong relationship with hydrological forcings such as astronomical and storm tides, aquifer recharge and pumping effects. These forcings govern the aquifer hydraulic head, the spatial distributi...

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Bibliographic Details
Published in:Hydrogeology journal 2020-08, Vol.28 (5), p.1679-1694
Main Authors: Canul-Macario, Cesar, Salles, Paulo, Hernández-Espriú, Antonio, Pacheco-Castro, Roger
Format: Article
Language:English
Subjects:
Aquatic Pollution
Aquifer models
Aquifer recharge
Aquifers
Astronomical tides
Coastal aquifers
Confined aquifers
Correlation
Correlation analysis
Earth and Environmental Science
Earth Sciences
Empirical analysis
Freshwater
Geology
Geophysics/Geodesy
Groundwater
Groundwater recharge
Groundwater salinity
Head (fluid mechanics)
Hydrogeology
Hydrology
Hydrology/Water Resources
Inland water environment
Karst
Meteorological tides
Piezometric head
Saline water
Saline-freshwater interfaces
Salinity
Salinity effects
Sea level
Sea level variations
Spatial distribution
Storm surges
Storm tides
Storms
Tides
Time series
Waste Water Technology
Water Management
Water Pollution Control
Water Quality/Water Pollution
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Summary:Coastal aquifers are characterized by a mixing zone with freshwater–saltwater interactions, which have a strong relationship with hydrological forcings such as astronomical and storm tides, aquifer recharge and pumping effects. These forcings govern the aquifer hydraulic head, the spatial distribution of groundwater salinity and the saline interface position. This work is an empirical evaluation through time-series analysis between aquifer head and groundwater salinity associated with the sea-level dynamics and the aquifer recharge. Groundwater pressure, temperature and salinity were measured in a confined aquifer in the northwest coast of Yucatan (México) during May 2017–May 2018, along with precipitation. Cross-correlation and linear Pearson correlation ( r ) analyses were performed with the data time series, separating astronomical and meteorological tides and vertical recharge effects. The results show that the astronomical and meteorological tides are directly correlated with the aquifer head response (0.71 
ISSN:1431-2174
1435-0157
DOI:10.1007/s10040-020-02151-9