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Time Series Analysis of Area of Deltaic Barrier Island in Nakdong River Using Landsat Satellite Image

Landsat 위성영상을 활용한 낙동강 삼각주 연안사주의 면적 시계열 분석

  • Lee, Seulki (Kangwon National University) ;
  • Yang, Mihee (Division of Science Education, Kangwon National University) ;
  • Lee, Changwook (Division of Science Education, Kangwon National University)
  • Received : 2016.03.22
  • Accepted : 2016.09.21
  • Published : 2016.10.31

Abstract

Nakdong river barrage was affected by artificial interference such as construction of port, industrial complex and estuary barrage. This change in Nadong river lead to environmental changes and affected the ability of barrier islands. Therefore, it is decided that the observation of changes in the Nakdong river estuary is very important. In this paper, the topographic change of the Nakdong river barrage observe based on Landsat TM, ETM+ images from 1984 to 2015. In addition, this study tried to conduct a comparative analysis on the area for change of sandy sediment according to tide level. This results could estimate height and volume about sandy sediment accumulated on the lower sand dune. Also, these results are expected to be the basis for prediction of the changing topography of the sand dune. The area of the average change in region 1,2,3 was calculated as 3,015m2, 167,550m2, 14,596m2. This result is expected to be very useful for the continuous observation for sediment changes of Nakdong river.

낙동강 하구역은 과거 30여 년 간 하구둑, 산업단지, 항구 등의 건설로 인해 인위적인 영향을 받아왔다. 낙동강의 이러한 변화는 연안사주의 기능에 영향을 줄 수 있고, 환경적인 변화를 야기하고 있다. 따라서 낙동강 하구의 변화를 관측하는 것은 매우 중요하다고 판단된다. 이에 따라 본 연구에서는 1984년부터 2015년까지 Landsat TM, ETM+ 영상을 기반으로 낙동강 하구의 연안사주의 지형의 면적변화를 관측하고자 한다. 또한, 조위에 따라 현재 존재하고 있는 사주 하부의 사질퇴적물이 나타나는 면적을 분석하고자 한다. 이는 사주 하부에 축적된 사질 퇴적물의 높이와 양을 추정할 수 있을 것이며, 이러한 결과는 향후 사구의 지형변화를 예측하는데 기반이 될 것으로 기대된다. 따라서 본 연구에서는 31년간의 Landsat 영상을 기반으로 국립해양조사원에서 제공한 조위 값을 이용하여 조위에 따른 하구역 지형의 면적변화를 연구하였다. 1지역은 3,015 m2 , 2지역은 167,550 m2 , 3지역은 14,596 m2만큼의 평균 면적변화가 나타난 것으로 계산되었다. 이 결과는 낙동강 퇴적물의 지속적인 변화를 관측하는데 매우 유용할 것으로 판단된다.

Keywords

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