Kim Kue-Young, Chon Chul-Min, Park Ki-Hwa
Groundwater and Geothermal Division, Korea Institute of Geosciences and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon, Republic of Korea.
Ground Water. 2007 Nov-Dec;45(6):723-8. doi: 10.1111/j.1745-6584.2007.00349.x.
Salt water intrusion is a key issue in dealing with exploitation, restoration, and management of fresh ground water in coastal aquifers. Constant monitoring of the fresh water-salt water interface is necessary for proper management of ground water resources. This study presents a simple method to estimate the depth of the fresh water-salt water interface in coastal aquifers using two sets of pressure data obtained from the fresh and saline zones within a single borehole. This method uses the density difference between fresh water and saline water and can practically be used at coastal aquifers that have a relatively sharp fresh water-salt water interface with a thin transition zone. The proposed method was applied to data collected from a coastal aquifer on Jeju Island, Korea, to estimate the variations in the depth of the interface. The interface varied with daily tidal fluctuations and heavy rainfall in the rainy season. The estimated depth of the interface showed a good agreement with the measured electrical conductivity profile.
海水入侵是沿海含水层中淡水开采、恢复和管理的关键问题。持续监测淡水-海水界面对于合理管理地下水资源至关重要。本研究提出了一种简单的方法，利用从单个钻孔内的淡水和咸水区获得的两组压力数据来估算沿海含水层中淡水-海水界面的深度。该方法利用了淡水和咸水之间的密度差异，实际上可用于淡水-海水界面相对清晰且过渡带较薄的沿海含水层。将所提出的方法应用于从韩国济州岛的一个沿海含水层收集的数据，以估算界面深度的变化。界面随每日潮汐波动和雨季的大量降雨而变化。估算的界面深度与实测的电导率剖面显示出良好的一致性。
