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Research Journal of Earth and Planetary Sciences Vol. 3(1) pp.1 – 12 February 2013
Available online http://www.globalresearchjournals.org/?a=journal&id=rjeps
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Spatial and Temporal Variations of Groundwater-Stream Water Interaction in an Agricultural Area, Case study: Haean Basin, Korea
Heejung Kim*, Jin-Yong Lee** and Kang-Kun Lee*
*School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea
**Department of Geology, College of Natural Sciences, Kangwon National University, Chuncheon 200-701, Korea
Corresponding author's E-mail: hydrolee@kangwon.ac.kr
| Abstract |
A spatial and temporal variation of seepage in the Haean basin of Korea was examined using seepage meters and piezometers in the streambeds. More so, stream water budget and groundwater levels were also measured. The streambed of the study area was mostly sand bed forms and the seepage direction show high among 35 piezometer points at two stream transects each. Various upwelling (22.8, 4% at HSV1 and HSV2 in August and 77.1, 71.4% in October), downwelling (68.6, 51.4% in August and 0, 0% in October) and stagnation (8.6, 8.6% in August and 22.9, 28.6% in October) were found during different season. Vertical hydraulic gradients were generally small (-0.3~0.15 at HSV1, -0.1~0.1 at HSV2 in August and 0~0.05 at HSV1, 0~0.05 at HSV2 in October, respectively) but they show a significant variation with season and location. Downwelling was dominant in August while upwelling was dominant in October at HSV1 and HSV2. Furthermore, the proportion of stagnation points was greater in the dry season. A balance of total stream water flux and measured groundwater levels also indicated that the stream was generally losing in wet season. An integrated evaluation of seepage rate, vertical hydraulic gradient, stream flow budget and groundwater levels enhanced understanding of the groundwater-stream water interaction in this study area.
Keywords: Groundwater-Stream Water Interaction, Seepage Direction, Vertical Hydraulic Gradient, Stream Flow Velocity