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Analysis of Seabottom and Habitat Environment Characteristics based on Detailed Bathymetry in the Northern Shore of the East Sea(Gyeongpo Beach, Gangneung)
정밀 해저지형 자료 기반 동해 북부 연안(강릉 경포) 서식지 해저면 환경 특성 연구
Econ. Environ. Geol. 2020 Dec;53(6):729-42
Published online December 31, 2020;  https://doi.org/10.9719/EEG.2020.53.6.729
Copyright © 2020 the Korean society of economic and environmental gelology.

Myoung Hoon Lee1, Hyun Soo Rho2, Hee Gab Lee2, Chan Hong Park1 and Chang Hwan Kim1*
이명훈1 · 노현수2 · 이희갑2 · 박찬홍1 · 김창환1*

1Dokdo Research Center, East Sea Research Institute, Korea Institute of Ocean Science & Technology, Uljin, 36315, Korea
2East Sea Environment Research Center, East Sea Research Institute, Korea Institute of Ocean Science & Technology, Uljin, 36315, Korea
1한국해양과학기술원 동해연구소 독도전문연구센터, 2한국해양과학기술원 동해연구소 동해환경연구센터
Received October 12, 2020; Revised November 13, 2020; Accepted November 25, 2020.
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 the original work is properly cited.
 Abstract
In this study, we analyze seabottom conditions and characteristics integrated with topographic data, seafloor mosaic, underwater images and orthophoto(drone) of soft-hard bottom area around the Sib-Ri rock in the northern shore of the East Sea(Gyeongpo Beach, Gangneung). We obtained field survey data around the Sib-Ri rock(about 600 m × 600 m). The Sib-Ri rock is formed by two exposed rocks and surrounding reef. The artificial reef zone made by about 200 ~ 300 structures is shown the western area of the Sib-Ri rock. The underwater rock region is extended from the southwestern area of the exposed the Sib-Ri rock with 9 ~ 11 m depth range. The most broad rocky seabottom area is located in the southwestren area of the Sib-Ri rock with 10 ~ 13 m depth range. The study area were classified into 4 types of seabottom environment based on the analysis of bathymetric data, seafloor mosaics, composition of sediments and images(underwater and drone). The underwater rock zones(Type I) are the most distributed area around the Sib-Ri Rock(about 600 m × 600 m). The soft seabottom area made by sediments layer showed 2 types(Type II: gS(gravelly Sand), Type III: S(Sand)) in the areas between underwater rock zones and western part of the Sib-Ri rock(toward Gyeongpo Beach). The artificial reef zone with a lot of structures is located in the western part of the Sib-Ri rock. Marine algae(about 6 species), Phylum porifera(about 2 species), Phylum echinodermata(about 3 species), Phylum mollusca(about 3 species) and Phylum chordata(about 2 species) are dominant faunal group of underwater image analysis area(about 10 m × 10 m) in the northwestern part of the SibRi rock. The habitat of Phylym mollusca(Lottia dorsuosa, Septifer virgatus) and Phylum arthropoda(Pollicipes mitella, Chthamalus challengeri hoek) appears in the intertidal zone of the Sib-Ri rock. And it is possible to estimate the range and distribution of the habitat based on the integrated study of orthphoto(drone) and bathymetry data. The integrated visualization and mapping techniques using seafloor mosaic images, sediments analysis, underwater images, orthophoto(drone) and topographic data can provide and contribute to figure out the seabottom conditions and characteristics in the shore of the East Sea.
Keywords : East Sea, bathymetric map, seafloor image, mapping, habitat

 

February 2021, 54 (1)