• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.61-62
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• 2001

본 연구에서는 인공어초사업의 효율성 향상에 기여하고, 우리나라 연안어업의 체계적인 관리와 발전을 위하여 필요할 것으로 예상되는 GIS (Geographic Information System) 정보망 구축에 필요한 정밀음향측심시스템에 관하여 연구하였으며, 이 시스템의 유용성을 확인하기 위하여 정치망어장의 해저지형과 인공어초 투입해역의 해저지형을 조사 분석하는 현장실험을 수행하였다. (중략)

• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.128-132
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• 2010

울릉분지 북동쪽 독도 주변 해역은 해수면 위의 작은 섬들과 해저에 큰 화산체로 구성된 독도와 해수면 아래 큰 규모의 해산 두 개(심흥택해산, 이사부해산)가 위치하고 있으며 그 중 해수면위로는 독도만 솟아 있다. 정밀해저면영상기(MS-1000)를 이용하여 큰 규모의 조사선으로 접근이 어려웠던 동도-서도 주변 연안에 대한 정밀해저면영상 조사를 2010년 1월에 소형조사선을 이용하여 수행하였다. 부두 동쪽 해안은 동도와 근접하고 있어 큰 규모의 돌출 암반이 많이 분포하고 있으며 부두 북쪽으로는 모래층의 연흔구조가 많이 나타나며 소규모의 암반 및 자갈들이 많이 분포하는 것으로 판단된다. 동도와 서도사이의 해저면영상을 분석해보면 동도 선착장부근으로는 모래퇴적물의 연흔구조가 많이 나타나고 동도와 서도 중앙부로 가면서 모래보다는 작은 자갈들이 많이 분포하며 서도쪽으로 가면서는 모래 및 자갈퇴적물이 암반구조로 이루어져있는 것으로 판단된다. 정밀해저면영상기(MS-1000)는 고정밀한 해저면영상을 획득할 수 있으며 불규칙한 지형으로 기존 장비가 접근하없어지며기 어려운 해저지형에도 사용하기 적합한 것으로 판단된다. 향후 항구 및 해안구조물 등과 같은 고정밀해저면영상이 필요한 분야에 활용성이 높을 것으로 생각되고 또한 유지/보수가 필요한 수중 군시설 및 부두시설에 대한 정밀조사를 통하여 효율적 관리 정보제공할 수 있을 것으로 판단된다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.4
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• pp.343-349
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• 2011

Seabed topography and marine site survey should be performed first in the design and construction of marine structures. We could successfully acquire the seafloor topography information can be obtained by bathymetric survey and side scan sonar and the sediment layer thickness and 3D bedrock depth by seismic reflection. It is necessary to apply carry out the integrated interpretation to each other in the ocean civil Eng. In this paper, we have obtained information on the sea bottom topography and water depth at the same time using interferometer technique and on the basement depth by seismic reflection. We have performed to assess the proposed method on the seafloor topographic survey with bedrock.

• 한국지구물리탐사학회:학술대회논문집
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• 2008.10a
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• pp.93-96
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• 2008

We analyze a precise seabed feature around the Hupo Bank by using Multi-beam echosounder. Multi-beam echosounder system can observe the topography undulation according to the navigation of the survey ship by shooting wide beam. It is possible to embody a precision seabed feature because it can be make high density of incompletion depth sounding between survey lines. Through this survey, there is the Hupo Bank which is 84 km long, 1-15 km wide, 5.3-160 m deep in the center, at the west is moat, at the east is scarp and submarine canyon. The top of the Hupo Bank is the Wangdol reef that has 5.3 m in depth of water at least. Moat in survey area is 30 m long, and 30-40 m wide and has a depressed channel. The gap of depth of water in scarp is approximately 60 m and shows a characteristic of cuttig plane. Submarine canyon is 3.5 - 13.5 km wide.

• 한국지구물리탐사학회:학술대회논문집
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• 2008.10a
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• pp.185-190
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• 2008

Geophysical survey were investigated in the offshore around East Sea Research Institute, Korea Ocean Research and Development Institute (Jukbyeon-myun, Uljin-gu, Gyeongsangbuk-do, Korea). The surveys were conducted aboard the R/V Jangmok in 2008 using a hull-mounted EM 3002 multi-beam echosounder. Precise bathymetry and seabed images were obtained using multi-beam and thicknesses of sedimentary layer were found through seismic survey. Submarine topography deepens parallel to the coastline to -60 m and rock mass distributed in the southeast of study area. By finding the thickness of sedimentary layer through seismic survey, a sedimentary thickness on the study area was established. Futhermore, monitoring data of bathymetry, substructure and sedimentary environment will be secured through successive geophysical investigation.

• Magazine of korean Tunnelling and Underground Space Association
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• v.13 no.6
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• pp.68-80
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• 2011

해저터널은 태풍, 폭우 등과 같은 악천후에도 안정적으로 자국내 도서지역 및 인접국가간 교통 및 물류수송체계 운용을 가능하게 하는 주요 사회기반시설로서 활용되어왔다. 이러한 해저터널 프로젝트를 안전하고 경제적으로 수행하기 위해서는 해저터널의 공학적 특성을 정확하게 이해하는 것이 매우 중요하다. 이에 해저터널의 지반조사를 중심으로 전반적으로 언급하였다. 해저터널은 육상터널과는 달리 조사, 설계 및 시공단계에 있어 많은 불확실성과 위험성을 가지고 있으므로, 프로젝트의 특성에 맞는 정밀하고 정확한 조사는 해저터널의 성공여부를 좌우할 수 있다. 따라서 계획단계에서 철저한 문헌조사 연구 및 해저지형, 지질구조 등에 대한 이해를 기반으로 해저지반 조사계획을 수립 및 수행하여야 한다. 또한 해저터널의 특성상 완벽한 지반조사는 불가능하므로 광범위한 조사에도 불구하고 사전에 예상치 못한 불량한 지반조건을 마주칠 가능성이 크므로, 불확실성과 위험성을 염두에 두고 설계 및 시공에 임하여야 한다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.37 no.3
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• pp.214-222
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• 2001

A precise echosounding system to investigate the topographical characteristics of the coastal fishing ground was composed of a public-DGPS receiver, a single beam echosounder and a survey software. To confirm the usefulness of the system, a set-net fishing ground and the distribution of artificial reefs were surveyed. The results obtained are as follows : 1. The 2-D positioning error of the public-DGPS receiver with a DGPS mode and a GPS mode was 5.47 m, 7.03 m, respectively. 2. The experimented set-net fishing ground was located on the level ground at the depth of 9-10 m, a small size valley 1-2 m deep and approximately 10 m wide was found at a distance of 120 m from the set-net to the south. 3. In the artificial reefs' water area near the Jaran Bay, it was confirmed that twenty rectangular artificial reefs were established by the piece at the depth of 15-25 m and a natural reef 5-8 m high on the sea bed was located near the group of artificial reefs. 4. It was confirmed that the precise echosounding system was a useful tool in the pre-study to choice an appropriate water area to provide the artificial reef.

• Economic and Environmental Geology
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• v.52 no.6
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• pp.561-571
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• 2019

The Hupo Basin, continental marginal basin, of the East Sea extends to Uljin-gun and Yeongdeok-gun. The Hupo Bank, a terrain that is higher than the surrounding seabed, is located at the eastern boundary of the Hupo Basin. KIOST(Korea Institute of Ocean Science and Technology) conducted detailed bathymetry surveys in the northern, central and southern areas of the Hupo Basin from 2011 to 2013. The Hupo Basin, bounded by steep slopes of the Hupo Bank, is deepened from the west coast to the east and deepest to a maximum depth of about 250 m. A narrow seafloor channel appears in the northern, central, and southern areas with the deepest depths. Numerous pockmarks appear on the seafloor at depths of about 150 ~ 250 m in all the three areas of the detailed bathymetry surveys. These pockmarks generally have diameters of about 20 to 50 m and depths of about 4 to 6 m, with craterlike submarine topography of various sizes. Seafloor sediments in the pockmark areas consist of fine silt. Comparing the shape and size of the pockmark of the Hupo Basin with that of other regions of the world, it is considered to be classified as a normal pockmark. There are about 7 pockmarks/1 ㎢ in the northern part of the three areas and about 8 pockmarks/1 ㎢ in the central part. The southern part has about 5 pockmarks/1 ㎢. If the area with the possibility of pockmarks is extended to the depth area of about 150 ~ 250 m in the entire Hupo Basin, the number of pockmarks is estimated to be more than about 4800. The pockmark of the Hupo Basin is more likely to be generated by a fluid such as a liquid than a gas. But it is necessary to scrutinize the cause and continuously monitor the pockmark.

• The Journal of the Acoustical Society of Korea
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• v.34 no.6
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• pp.444-454
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• 2015

Measurements of bottom backscattering strengths in a frequency range of 6-14 kHz were made on the shallow water off the southern Gyeonggi Bay in Yellow Sea in May 2013, as part of the KIOST-HYU joint acoustics experiment. Geological surveys for the experimental area were performed using multi-beam echo sounder, sparker system, and grab sampling to investigate the bottom topography, sub-bottom profile and composition of surficial sediment, respectively. In this paper, the backscattering strengths as a function of grazing angle (in range of $28^{\circ}{\sim}69^{\circ}$) were estimated and compared to the predictions obtained by Lambert's law and APL-UW scattering model. Finally, the effects of geoacoustic parameters corresponding to the experimental area on the backscattering strengths are discussed.

• Geophysics and Geophysical Exploration
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• v.11 no.3
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• pp.167-176
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• 2008

Lau basin of the south Pacific, as an active back arc basin, is promising area bearing seafloor massive hydrothermal deposit that is located in a subduction zone between the Pacific ocean plate and Indo-Australian continental plate. We performed multi-beam bathymetry survey in the Lau basin using EM120, to find out high hydrothermal activity Bone. Fonualei Rift and Spreading Center (FRSC) and Mangatolou Triple Junction (MTJ) area were selected for precise site survey through seafloor morphology investigation. The result of surface and deep-tow magnetometer survey showed that Central Anomaly Magnetization High (CAMH) recorded which is associated with active ridge in FRSC-2 and revealed very low magnetic anomalies that can be connected to past or present high hydrothermal activity in MTJ-1 seamount area. Moreover, the physical and chemical tracers of hydrothermal vent flume, i.e., transmission, hydrogen ion concentration (pH), adenosine triphosphate (ATP), methane (CH4) by use of CTD system, showed significant anomalies in those areas. From positive vent flume results, we could conclude that these areas were or are experiencing very active volcanic activities. The acquired chimney and hydrothermal altered bed rock samples gave us confidence of the existence of massive hydrothermal deposit. Even though not to use visual exploration equipment such as ROV, DTSSS, etc., traditional marine geophysical investigation approach might be a truly cost-effective tool for exploring seafloor hydrothermal massive deposit.