Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Characteristics of Surface Topography and Sediments before and after the Typhoon Kompasu in the Gochang Open-Coast Intertidal Flat, Korea

태풍 곤파스 전과 후의 고창 개방형 조간대 표층 지형과 퇴적물 특성

  • Kang, Sol-Ip (Division of Science Education and Institute of Science Education, Chonbuk National University) ;
  • Ryang, Woo-Hun (Division of Science Education and Institute of Science Education, Chonbuk National University) ;
  • Chun, Seung-Soo (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
  • 강솔잎 (전북대학교 과학교육학부/과학교육연구소) ;
  • 양우헌 (전북대학교 과학교육학부/과학교육연구소) ;
  • 전승수 (전남대학교 지구환경과학부)
  • Received : 2018.12.31
  • Accepted : 2019.03.26
  • Published : 2019.04.30
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Abstract

In the macro-tide open coast of the Korean western coast, typhoon effects were investigated in terms of variations on topography, surface sediment, and sedimentary environment, which appeared before and after the typhoon Kompasu of 2010. The Kompasu of small size and strong intensity landed on the southwestern coast of the Korean Peninsula and passed across the inland between September 1st and 2nd in 2010. Topography and surface sediments before and after the typhoon were measured and sampled along the survey line of 22 sites in the Gochang Donghori intertidal flat. The intertidal area was divided into high tidal zone, middle tidal zone, and lower tidal zone on the basis of mean high water level, mean sea level, and mean low water level. Topographic variation before and after the typhoon represented deposition of average 0.03 m in high tidal zone, erosion of average -0.15 m in middle tidal zone, and erosion of average -0.39 m in lower tidal zone, respectively. Surface sediments of the intertidal flat consisted mainly of fine to medium sands, and the ratio of fine sand was the largest both before and after the typhoon. Surface sediments after the typhoon became finer in mean grain size showing well sorting rather than those before the typhoon.

서해안 대조차 개방형 연안에서 2010년 태풍 곤파스 전후에 나타난 지형, 표층 퇴적물, 퇴적상 변화에 대해 연구하였다. 소형의 강한 태풍인 곤파스는 2010년 9월 1일과 2일 사이에 한반도 남서부 해안에 상륙하여 내륙을 관통했다. 태풍 전후에 고창 동호리 조간대의 측선을 따라 30 m 간격으로 22개 지점에서 지형을 측량하고 표층 퇴적물을 채취하였다. 연구 지역을 평균고조면, 평균해수면, 평균저조면을 기준으로 고조대, 중조대, 저조대로 구분하였다. 태풍 전후의 지형 변화는 고조대에서 평균 0.03 m 퇴적, 중조대에서 평균 -0.15 m 침식, 저조대에서 평균 -0.39 m 침식으로 나타났다. 조간대의 태풍 전후 표층 퇴적물은 주로 세립사와 중립사로 구성되며, 세립사의 비율이 가장 높게 나타났다. 태풍 후 표층 퇴적물은 태풍 전에 비해 평균입도가 세립해졌고, 양호한 분급을 보였다.

Keywords

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