Journal of The Geomorphological Association of Korea (한국지형학회지)

The Geomorphological Association of Korea (한국지형학회)
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The Processes of Coastal Dunes and its Geomorphological Characteristics, Ui-island, Shinan-gun, Korea

우이도 해안사구의 지형특성과 형성과정

  • Shin, Won Jeong (Department of Geography Education, Seoul National University) ;
  • Kim, Jong Wook (Department of Geography Education, Seoul National University) ;
  • Kim, Jong Yeon (Department of Geography Education, Chungbuk National University) ;
  • Choi, Jeong-Heon (Department of Earth and Environmental Sciences, Korea Basic Science Institute)
  • 신원정 (서울대학교 지리교육과) ;
  • 김종욱 (서울대학교 지리교육과) ;
  • 김종연 (충북대학교 지리교육과) ;
  • 최정헌 (한국기초과학지원연구원 지구환경연구부)
  • Received : 2017.05.11
  • Accepted : 2017.06.13
  • Published : 2017.06.30
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Abstract

Massive coastal sand dunes are distributed in Ui-island, Shinan-gun. The sand dunes in Ui-island is worth studying, in terms of preserving natural environment without anthropogenic impacts. In this study, we surveyed geomorphological processes of the sand dune based upon measuring of geometric properties, grain size analysis, and OSL(Optically Stimulated Luminescence) age dating. The sediments of the dune consist mainly of well sorted medium sand with about 250$\mu$m. Based on spatial distribution of sand dunes, we found that they are formed by northwest monsoon during winter, and sands are supplied from Seongchon area in northern UI-island. According to OSL age dating, the sand dunes were deposited from $0.07{\pm}0.01ka$ to $0.17{\pm}0.04ka$. This result shows that the transformation of the dune due to the sand movement by wind was active during the last 100-200 years. The aerial photograph indicates that the dimension of the largest sand dune has decreased since 1945. Further research is needed to get more detailed information on geomorphic changes of sand dunes in UI-island.

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