Original Article

Econ. Environ. Geol. 2017; 50(6): 477-486

Published online December 31, 2017

https://doi.org/10.9719/EEG.2017.50.6.477

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Comparative Analysis of Bathymetry in the Dongdo and the Seodo, Dokdo using Multibeam Echosounder System

Myoung Hoon Lee1, Chang Hwan Kim1*, Chan Hong Park1, Hyun Soo Rho1 and Dae Choul Kim2

1Dokdo Research Center, East Sea Research Institute, Korea Institute of Ocean Science & Technology, Uljin 36315, Korea
2Pukyong National University, Department of Energy Resources Engineering, 48513 Busan, Korea

Correspondence to : kimch@kiost.ac.kr

Received: October 9, 2017; Revised: December 26, 2017; Accepted: December 28, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

In this study, we analyze precise seabed geomorphology and conditions for comparing the nearshore areas of the Dongdo(East Island) and the Seodo(West Island) using detailed bathymetry data and seafloor backscattering images, in Dokdo, the East Sea. We have been obtained the detailed bathymetry data and the seafloor backscattering data. The survey range is about 250 m × 250 m including land of islets to the nearshore areas of the southern part of the Dongdo and the Seodo. As a result of bathymetry survey, the southern area of the Dongdo(~50 m) is deeper than the Seodo(~30 m) in the water depth. The survey areas are consist of extended bedrocks from land of the Dongdo and the Seodo. The underwater rock region of the Seodo is larger than the Dongdo. In spite of similar extended rocks features from islets, there are some distinctive seabed characteristics between the southern nearshore areas of the Dongdo and the Seodo. The Talus-shaped seafloor environment formed by gravel and underwater rocks originating from the land of the Dongdo is up to about 15 m depth. And the boundary line of between extended bedrocks and seabottom is unclear in the southern nearshore of the Dongdo. On the other hand, the southern coast of the Seodo is characterized by relatively large scale underwater rocks and evenly distributed sediments, which clearly distinguish the boundary of between extended bedrocks and seafloor. This is because the tuff layers exposed to the coastal cliffs of the Dongdo are weak against weathering and erosion. It is considered that there are more influences of the clastic sediments carried from the land of the Dongdo compared with the Seodo. Particularly, the land of the Dongdo has been undergoing construction activities. And also a highly unstable ground such as faults, joints and cracks appears in the Dongdo. In previous study, there are dissimilar features of the massive tuff breccia formations of the Dongdo and the Seodo. These conditions are thought to have influenced the different seabed characteristics in the southern nearshore areas of the Dongdo and the Seodo.

Keywords Dokdo, Dongdo, Seodo, Bathymetric map, Seafloor image

다중빔 음향 측심기를 이용한 독도 동도와 서도 남부 연안 해저지형 비교 분석

이명훈1 ·김창환1* ·박찬홍1 ·노현수1 ·김대철2

1한국해양과학기술원 동해연구소 독도전문연구센터, 2부경대학교 에너지자원공학과

요 약

Article

Original Article

Econ. Environ. Geol. 2017; 50(6): 477-486

Published online December 31, 2017 https://doi.org/10.9719/EEG.2017.50.6.477

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Comparative Analysis of Bathymetry in the Dongdo and the Seodo, Dokdo using Multibeam Echosounder System

Myoung Hoon Lee1, Chang Hwan Kim1*, Chan Hong Park1, Hyun Soo Rho1 and Dae Choul Kim2

1Dokdo Research Center, East Sea Research Institute, Korea Institute of Ocean Science & Technology, Uljin 36315, Korea
2Pukyong National University, Department of Energy Resources Engineering, 48513 Busan, Korea

Correspondence to:kimch@kiost.ac.kr

Received: October 9, 2017; Revised: December 26, 2017; Accepted: December 28, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

In this study, we analyze precise seabed geomorphology and conditions for comparing the nearshore areas of the Dongdo(East Island) and the Seodo(West Island) using detailed bathymetry data and seafloor backscattering images, in Dokdo, the East Sea. We have been obtained the detailed bathymetry data and the seafloor backscattering data. The survey range is about 250 m × 250 m including land of islets to the nearshore areas of the southern part of the Dongdo and the Seodo. As a result of bathymetry survey, the southern area of the Dongdo(~50 m) is deeper than the Seodo(~30 m) in the water depth. The survey areas are consist of extended bedrocks from land of the Dongdo and the Seodo. The underwater rock region of the Seodo is larger than the Dongdo. In spite of similar extended rocks features from islets, there are some distinctive seabed characteristics between the southern nearshore areas of the Dongdo and the Seodo. The Talus-shaped seafloor environment formed by gravel and underwater rocks originating from the land of the Dongdo is up to about 15 m depth. And the boundary line of between extended bedrocks and seabottom is unclear in the southern nearshore of the Dongdo. On the other hand, the southern coast of the Seodo is characterized by relatively large scale underwater rocks and evenly distributed sediments, which clearly distinguish the boundary of between extended bedrocks and seafloor. This is because the tuff layers exposed to the coastal cliffs of the Dongdo are weak against weathering and erosion. It is considered that there are more influences of the clastic sediments carried from the land of the Dongdo compared with the Seodo. Particularly, the land of the Dongdo has been undergoing construction activities. And also a highly unstable ground such as faults, joints and cracks appears in the Dongdo. In previous study, there are dissimilar features of the massive tuff breccia formations of the Dongdo and the Seodo. These conditions are thought to have influenced the different seabed characteristics in the southern nearshore areas of the Dongdo and the Seodo.

Keywords Dokdo, Dongdo, Seodo, Bathymetric map, Seafloor image

다중빔 음향 측심기를 이용한 독도 동도와 서도 남부 연안 해저지형 비교 분석

이명훈1 ·김창환1* ·박찬홍1 ·노현수1 ·김대철2

1한국해양과학기술원 동해연구소 독도전문연구센터, 2부경대학교 에너지자원공학과

Received: October 9, 2017; Revised: December 26, 2017; Accepted: December 28, 2017

요 약

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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