Journal of The Geomorphological Association of Korea (한국지형학회지)

The Geomorphological Association of Korea (한국지형학회)
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Geomorphological Characteristics and OSL Ages of the Moraeul dune in Daechoengdo Island, South Korea

대청도 모래울 사구의 지형 특성과 OSL 연대

  • Choi, Kwang Hee (Department of Geography Education, Catholic Kwandong University)
  • 최광희 (가톨릭관동대학교 지리교육과)
  • Received : 2020.11.17
  • Accepted : 2020.12.04
  • Published : 2020.12.30
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Abstract

Coastal dunes play an important role in coastal defense. The Moraeul dune in Daecheongdo Island is representative in this regard. However, there is little knowledge, concerning the morphology, grain size, and formation timing of the dune. This study investigated the geomorphological characteristics of the Moraeul dune using topographic surveys, grain size analyses, and OSL dating. The dune was classified as 'single accreted foredune', which was developed under dense vegetation cover and efficient sand trapping. The dune consisted of fine to medium sand with 1.6Φ of mean grain size, and was covered with pine trees (> 100 years old). The samples from the upper part of the dune yielded quartz OSL ages ranging 0.5 ~ 0.7 ka. Therefore, it is likely that the dune developed at least before the Little Ice Age and became what it is today about one century ago.

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Acknowledgement

이 연구는 한국기초과학지원연구원의 '자연재해 재발주기 분석기술 플랫폼 구축(KBSI C050100)'의 일부로 수행되었습니다. 시료 채취 및 측량 등 야외조사를 도와주신 김윤미 선생님께 감사드립니다.