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

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study on Physical Characteristic of Ground water and Sediment Property in Intertidal Flat of Nakdong River Estuary

낙동강 하구 조간대 지하수의 물리적 특성 및 퇴적물 성상에 관한 연구

  • Kim, Heon-Tae (Department of Ocean Engineering, Pukyong National University) ;
  • Kim, Kyunghoi (Department of Ocean Engineering, Pukyong National University) ;
  • Ryu, Sung-Hoon (Department of Ocean Engineering, Pukyong National University) ;
  • Lee, In-Cheol (Department of Ocean Engineering, Pukyong National University)
  • Received : 2015.07.23
  • Accepted : 2015.10.27
  • Published : 2015.10.31
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Abstract

In the present study, we investigated the physical characteristics of ground water behaviors and sediment properties in intertidal flat of Nakdong River Estuary. Variations in level and temperature of the groundwater depended on tides. And increase of river discharge led to increase in groundwater level and decrease in ground salinity at a depth of several ten cm. Difference in permeability of the intertidal flat sediments due to content of fine fraction affect velocity of groundwtaer level decrease at low tide. Furthermore, enhancement of groundwater flow due to the increase in permeability leaded to decrease of fine fraction in the intertidal flat sediments.

낙동강 하구역 조간대의 보존 및 관리를 위한 기초적 연구로, 낙동강 하구 조간대를 대상으로 지하수의 물리적 특성 및 퇴적물의 성상을 조사하였다. 조간대의 지하수위 및 지하수온의 변화는 조석에 영향을 받으며, $5,000m^3/s$ 이상의 하천수 방류는 조간대의 지하수위를 상승시킬 뿐만 아니라 지반 내 수십 cm 깊이의 지하수 염분을 감소시키는 것으로 조사되었다. 간조 시 조간대 지하수위의 하강 형태는 조간대 퇴적물의 세립질 함량에 따른 투수도 차이에 영향을 받는 것으로 나타났다. 또한 높은 투수도의 조간대 지반에서는 활발한 지하수 흐름에 의해 세립질의 퇴적이 감소하고 재부상이 증가하여 결과적으로는 낮은 세립질 함량의 조간대 지반을 형성하였다.

Keywords

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