Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Analysis of Ground Watertable Fluctuation at the Sandy Barrier Island on Jinu-do in Nakdong River Estuary

낙동강 하구역 진우도 자연해빈의 지하수위 변동해석

  • Park, Jung-Hyun (Interdisciplinary Program of Ocean Industrial Engineering, Pukyong National University) ;
  • Yoon, Han-Sam (Department of Ecological Engineering, Pukyong National University) ;
  • Lee, In-Cheol (Department of Ocean Engineering, Pukyong National University)
  • Received : 2014.04.03
  • Accepted : 2014.08.27
  • Published : 2014.08.31
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Abstract

This study selected five observational stations in the normal direction of Jinu-do(island) shoreline and observed water temperature, electrical conductivity and pressure from March, 2012 to January, 2013(about 11 months) and attempted to see the variation characteristics of ground watertable. This study wants to know : 1) External environment force factors(tide, climate, wave etc.) affecting ground watertable variation through time series and correlation analysis. 2) Spatial variations of ground watertable and electrical conductivity change by storm event. First, we found that the station at the intertidal zone was strongly affected by wave and tide level and the stations at sand dune and vegetation zone was affected by precipitation and tide level through time series data and correlation analysis. Second, during the storm event, we found that ground watertable and electrical conductivity are stabilized at the start line of sand dune and vegetation zone and transition zone between freshwater layer and seawater layer exists in the experiment area and is about 50~70 m from coastline of the south side of Jinu-do(island).

본 연구는 낙동강 하구역의 사주섬 중 최서측에 위치하는 진우도를 대상으로 실험구를 구축한 후 해안선의 법선 방향으로 관측점 5곳을 선정하여 2012년 3월부터 2013년 1월까지 약 11개월간 관측된 수온, 전기전도도, 압력값을 이용하여 지하수위 변동해석을 하였다. 1) 지하수위의 수온, 염분, 수위변동과 조위, 파랑, 강수량 등의 외력조건과의 시계열 분석 및 상관분석을 통하여, 소상대 정점에서는 파랑 및 조위의 영향, 식생 및 모래지반 정점에서는 강수량 및 조위의 영향을 크게 받음을 알 수 있었다. 2) 고파랑내습시 관측점간의 지하수위 및 전기전도도의 공간적 거동을 살펴본 결과 사구(Sand dune) 및 식생대(Vegetation zone)가 시작되는 지점에서 담수층과 해수층의 천이 영역(Transition zone)이 존재하였고, 진우도 남측을 기준으로 해안선에서 50~70 m 사이에 위치함을 알 수 있었다.

Keywords

References

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  2. A Study on Physical Characteristic of Ground water and Sediment Property in Intertidal Flat of Nakdong River Estuary vol.21, pp.5, 2015, https://doi.org/10.7837/kosomes.2015.21.5.467
  3. Variation Characteristics of the Groundwater Level of Natural Vegetation and Sandy Beaches vol.19, pp.1, 2016, https://doi.org/10.7846/JKOSMEE.2016.19.1.62
  4. A Comparative Study of Long-term Sea-level Changes along the Busan Coast due to Climate Change vol.31, pp.1, 2014, https://doi.org/10.13000/jfmse.2019.2.31.1.83
  5. Spatio-Temporal Changes of Vegetation Frontlines on Barrier Islands in the Nakdong River Estuary during Autumn 2018 vol.22, pp.2, 2014, https://doi.org/10.7846/jkosmee.2019.22.2.67