Journal of The Geomorphological Association of Korea (한국지형학회지)

The Geomorphological Association of Korea (한국지형학회)
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Temporal Changes in Gravel Beach Morphology of Dokdo Island Using Aerial Photos and Ground-based LiDAR Data

항공사진 및 지상라이다를 활용한 독도 자갈해빈의 시계열적 변화분석

  • Kang, Ji-Hyun (Team of Protected Area Research, Natioanl Institute of Ecology) ;
  • Kim, Hye-jin (Team of Protected Area Research, Natioanl Institute of Ecology)
  • 강지현 (국립생태원 보호지역연구팀) ;
  • 김혜진 (국립생태원 보호지역연구팀)
  • Received : 2021.06.02
  • Accepted : 2021.06.14
  • Published : 2021.06.30
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Abstract

In this study, the changes in morphology of Dokdo's gravel beach and its responses due to a storm event were analyzed using the aerial photos and 3D LiDAR data obtained during an ecosystem survey of the Dokdo in 2020. Dongdo Island's gravel beach, shown by aerial photo analysis, increased in area due to sedimentation after the construction of a dock, but there was no more significant changes in area after having grown to Sutdolbawi inside the dock. The changes in volume of the gravel beach were indicated based on 3D data acquired in May and November 2020. A strong typhoon that passed in September, 2002, caused erosion on the backshore and sedimentation on the foreshore and formed the berm by about 1.5 to 2 m high. The analysis showed that the sedimentation was 94.76 m3 in volume and 329 m2 in area and the erosion was 250.75 m3 in volume and 603m2 in area, which suggested that the overall change of the gravel beach was erosion. The changes in the morphology of the gravel beach on Seodo Island occurred with the seasons along with the changes in area. In addition, berms of different altitudes appeared on the southern and northern sides of the spit, which was also estimated to have formed by the seasonal current direction and wave energy.

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Acknowledgement

논문의 완성도를 높여주신 익명의 심사위원님들께 감사의 인사를 드립니다. 또한 현장에서 3D LiDAR 측량을 위해 함께 고생해주신 (주)지오시스템의 박재금과장님께도 감사의 인사를 드립니다. 본 논문은 환경부의 재원으로 국립생태원의 지원을 받아 수행하였습니다(NIE-수탁과제-2020-49, NIE-수탁과제-2021-01).