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2007 Ground Water Summit |
Monday, April 30, 2007
4:30 p.m. - 7:30 p.m.
Tuesday, May 1, 2007
9:30 a.m. - 1:30 p.m.
Tuesday, May 1, 2007
4:30 p.m. - 7:30 p.m.
Water-Level Fluctuations and Its Implication for Water Cycle in Gwangneung Forest Catchment, Korea
As a part of an interdisciplinary research project, HydroKorea, to ascertain the water cycle quantitatively, we have monitored fluctuations of water-level, electric conductivity and water temperature in two piezometers by 5-min interval from February to October in 2006. The water-level fluctuated on a daily basis with a clear diurnal variation related to the evapotranspiration from forests. Diurnal variations were dampened down right after the rainfall events, however, became obvious as the soil moisture decreased. Sudden rises in water level were triggered by rainfall events. Although two piezometers were installed about 5-m apart, their responses were significantly different. For example, the rates of water-level decline after rainfall events and the magnitudes of the diurnal variation were different, probably due to the different permeability of the unsaturated materials. Comparing water-level fluctuations with variation of electrical conductivity and water temperature, we would be able to separate water-level changes due to vertical infiltrations from lateral inflows through the saturated zone. Along with evapotranspiration and soil moisture data, power spectrum and wavelet analyses are employed to identify the multiscale interactions between these variables and to, quantify how water moves in between air-vadose zone-saturated zone.