22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Hydrogeological Characterization of Coastal Aquifers in Seocheon Watershed, Korea: A Case Study of Groundwater and Seawater Interaction

24 Sep 2019, 16:00
1h
Trade Fairs and Congress Center (FYCMA)

Trade Fairs and Congress Center (FYCMA)

Av. de José Ortega y Gasset, 201 29006 Malaga, Spain
Poster Topic 5 - Tools, methods and models to study groundwater Poster with refreshments

Speaker

Yongje Kim (KIGAM)

Description

For better understanding of the interaction of groundwater and seawater in coastal aquifers hydrogeological studies have been carried out. The regional water quality of groundwaters, reservoirs, and stream waters surrounding the study area was determined with a total of 100 samples in pre- and post-monsoon seasons of April to May and September to October in 2018 by analyzing the major cation/anion and radon contents. The main water quality types of groundwater, reservoir, and stream water are Ca-Cl, Ca-HCO3, and Ca-Cl, respectively. Groundwater and seawater interaction has been evaluated for the identification of tidal effect by time series analysis, hydrogeophysical method, and 2-dimensional semi-analytical solution. The time series analysis shows the groundwater level and freshwater/saltwater interface are influenced by 73% and 76%, respectively, mainly governed by tidal effect. In the result of electrical resistivity survey at the surrounding area of monitoring wells the subsurface area of the measuring line of 240~255m reflects the tide effect of the coastal aquifers. The analytical solution, on the other hand, reveals little changes of the interface, resulting that the interface depth is far away from the point in which the upper groundwater level changes occur due to the tidal effect. The preliminary results shown in this study need to be identified by further detailed investigations.

Primary authors

Yongje Kim (KIGAM) Dr Heejun Suk (KIGAM) Dr Heesung Yoon (KIGAM) Dr Soo-Hyoung Lee (KIGAM) Dr Jehyun Shin (KIGAM) Dr Seho Hwang (KIGAM) Dr Yongcheol Kim (KIGAM)

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