양구 해안분지에서의 지하수위 분포 및 강우 반응 분석

초록

The groundwater level distribution and characteristics of responses to rainfall were examined in the Haean basin of Yangu that has a single stream exit to the east. The groundwater levels showed a circular or elliptical distribution converging the center of the basin with different hydraulic gradients in the north and south regions. The waterlevel elevations exhibited a perfect correlation with topographic elevation (r² = 0.99) while the depth to water showed a rather weak correlation (r² = 0.49). The water table fluctuation (WTF) method yielded recharge ratios of 6.1~12.65% (Sy = 0.02) and 15.2~28.5%(Sy = 0.05). The waterlevels of HG3 well, which is much proximal to a stream, were weakly auto-correlated but they were highly sensitive to direct infiltration from the rainfall event. The shorter regulation times of the HG3 represented a quicker dissipation of the input stress (rainfall).

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