암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
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독도천연보호구역 해빈자갈퇴적층(몽돌 해변)의 외래 역 분포 변화

Variation of Allochthonous Gravels in the Beach Gravel Deposit of the Island Dokdo Natural Reserve

  • Lim, Hoseong (Department of Geology, Kyungpook National University) ;
  • Park, Jinsu (Department of Culture and Tourism, Cheongseong Country Office) ;
  • Kim, Jung-Hoon (Division of Environmental Policy, Gyeongsangbuk-do privincial government) ;
  • Woo, Hyeon-Dong (Department of Geology, Kyungpook National University) ;
  • Jang, Yun-Deuk (Department of Geology, Kyungpook National University)
  • 투고 : 2017.06.26
  • 심사 : 2017.07.18
  • 발행 : 2017.09.30
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초록

여러 분야에서 높은 관심을 받고 있으며 무엇보다 지질학적으로 희소성과 순수성을 지닌 독도 천연보호구역의 해빈자갈퇴적층(몽돌 해변)을 대상으로 5년간 외부에서 유입된 역 이 얼마나 분포하는지에 대해 모니터링 하였다. 연구 지역인 동도 선착장 인근 및 서도 어민 숙소 인근 해빈자갈퇴적층에서, 주로 발견되는 몽돌의 종류에는 독도에서 직접적으로 기원한 것으로 판단되는 현무암, 조면암류, 응회암류와 외부에서 유입된 것으로 판단되는 화강암, 유문암, 편마암, 규암, 대리암, 그리고 콘크리트가 있다. 2011년과 2016년의 외래 역 데이터를 비교해 보면 동 서도에서 암종의 변화는 발견되지 않았으며, 각 지역에서 가장 빈번하게 발견되는 외래 역의 순위 역시 동도에서 화강암, 콘크리트, 편마암, 그리고 서도에서 콘크리트, 편마암, 화강암 순으로 동일하다. 그러나 동도와 서도의 전체 조사 면적에 대한 외래 역 면적의 비율은 다소 감소했다. 기존 시설물의 파괴와 외래 건축 자재 유입이 해빈자갈퇴적층에 존재하는 외래 역에 대한 주요한 유입 경로로 예상되는 가운데, 전체적인 오염도가 감소했다는 점은 연구기간 동안 외래 역 유입에 대한 관리가 대체로 개선 또는 최소한 악화되지 않았다는 점을 지시한다. 한편 지속적인 낙석이 몽돌의 분포에 영향을 끼친 것으로 판단되며, 낙석 영향에 대한 지속적인 평가가 요구된다.

Five year term monitoring investigating variation of allochthonous originated gravels are has been conducted in the beach gravel deposit of the Island Dokdo natural reserve which takes purity and uniqueness with enormous attention though a number of areas. The beach gravel deposits near the dock of the Dongdo and near the accommodation facility of the Seodo comprise various types of gravels including basalt, trachyte, and tuff from the Dokdo itself, and granite, rhyolite, gneiss, quartzite, marble, and concrete from elsewhere. The types of the allochthonous gravels on the basis of the study in 2011 and in 2016 shows no difference, so is the ranking of abundance of the allochthonous gravels; granite-concrete-gneiss in turn on the Dongdo, concrete-gneiss-granite in turn on the Seodo. Nevertheless, the relative ratio of the allochthonous gravel area against the total area is decreased. While it is suspected that the disintegrated facility and the influx of material for construction are the main 2 reasons for the contamination by allochthonous gravel, diminished total contamination ratio indicate that supervising allochthonous material has been improved; at least not worse during the 5 years. On the other hand, it is inferred that gradual influence of rockfall also has been made the gravel beach changed. Therefore, consistent rockfall investigation must be inquired.

키워드

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