Dynamic freshwater-saline water interaction in the coastal zone of Jeju Island, South Korea

Freshwater-saline water interactions were evaluated in a coastal region influenced by external forces including tidal fluctuations and seasonal rainfall variations. Five different coastal zones were considered on Jeju Island, South Korea, and electrical conductivity (EC) profiles from the monitoring...

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Bibliographic Details
Published in:Hydrogeology journal 2009-05, Vol.17 (3), p.617-629
Main Authors: Kim, Kue-Young, Park, Yoon-Suk, Kim, Gee-Pyo, Park, Ki-Hwa
Format: Article
Language:English
Subjects:
Aquatic Pollution
Aquifers
Coastal aquifers
Coastal zone
Earth and Environmental Science
Earth Sciences
Fluctuations
Fresh water
Freshwater resources
Geologic formations
Geology
Geophysics/Geodesy
Groundwater levels
Hydraulic properties
Hydrogeology
Hydrology
Hydrology/Water Resources
Rainfall
Saline water
Saline-freshwater interfaces
Salt-water/freshwater relations
Seawater
spectral analysis
Tidal effects
Time series
Waste Water Technology
Water depth
Water Management
Water Pollution Control
Water Quality/Water Pollution
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Summary:Freshwater-saline water interactions were evaluated in a coastal region influenced by external forces including tidal fluctuations and seasonal rainfall variations. Five different coastal zones were considered on Jeju Island, South Korea, and electrical conductivity (EC) profiles from the monitoring wells were examined to identify the configuration of the freshwater-saline water interface. There appeared to be discrepancies among EC profiles measured at different points in time. To analyze the dynamic behavior of freshwater-saline water interactions, groundwater level measurements and multi-depth EC and temperature probes were used to obtain time-series data; the data showed that water level, EC and temperature were influenced by both tidal fluctuations and heavy rainfall. The effects of oceanic tide on EC and temperature differed with depth due to hydraulic properties of geologic formations. A spectral filter was used to eliminate the effects of tidal forces and provide information on the influence of heavy rainfall on water level, EC and temperature. Heavy rainfall events caused different patterns and degrees of variation in EC and temperature with depth. The time-series data of EC and temperature in the subsurface at various depths enable greater understanding of the interaction processes between fresh and saline water.
ISSN:1431-2174
1435-0157
DOI:10.1007/s10040-008-0372-4