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

Kim, Kue-Young; Park, Yoon-Suk; Kim, Gee-Pyo; Pak, Ki-hwa

Dynamic freshwater–saline water interaction in the coastal zone of Jeju Island, South Korea | Interaction dynamique eau douce-eau salée sur la zone côtière de l’île de Jeiju, Corée du Sud Interacciones dinámicas entre aguas dulces y salinas en la zona costera de la isla Jeju, Corea del Sur 韩国济州岛海岸带咸-淡水的动态相互作用 Interacção dinâmica água doce-água salgada na região costeira da ilha de Jeju, Coreia do Sul

2009

Kim, Kue-Young | Park, Yoon-Suk | Kim, Gee-Pyo | Pak, Ki-hwa

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.

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