남해 연안 개조개 (Saxidomus purpuratus) 치패 서식지의 퇴적환경

홍서현,김영혜,유준택,김다혜 한국패류학회 2017 The Korean Journal of Malacology Vol.33 No.4

This paper was aimed to sedimentary environment appropriate for survival and inhabit of Saxidomus purpuratus juvenile. The sediment type in Goheung coast was dominated by silt (78.1 ± 0.6%), and followed by clay (20.2 ± 0.7%) and sand (1.7 ± 0.8%), and that in Hwagye coast was similar to that of Goheung coast (Silt 78.5 ± 0.7%, Clay 20.7 ± 0.6% and Sand 0.8 ± 0.4%). Thus the Saxidomus purpuratus juvenile habitat was mainly composed of silt. In case of Saxidomus purpuratus adult habitat, silt (79.6 ± 0.5%), and followed by clay (19.7 ± 0.5%) and sand (0.7 ± 0.3%). But, the research results, sedimentation environment showed the highest response rate (50%) as the environmental factors for juvenile survival. Sandy silty showed the highest response rate (83%) for the most appropriate sedimentation environment.

Late Pleistocene sedimentary environment and reverse faulting along the Chugaryung Fault in the central Korean Peninsula: a case study on the Cheorwon Basin

신승원,천영범,최정헌,정대교,최승엽,임현수,배한경,이희권 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.6

The Cheorwon area of South Korea has several records of the Quaternary faulting along the Chugaryung fault system and volcanic activity (Hantangang River Basalt). The most recent faulting event occurred along a segment of the Wangsukcheon fault (ca. 210 ka). In this study, a 5-m-deep trench was examined at the northern end of the Cheorwon Plain. The formation mechanism(s) and characteristics of local sediments as well as the timing of the Quaternary faults observed in the lower sections were analyzed. The sediments are very fine-grained, with a sand content of less than 5%. Soil wedge structures indicate that the sediments were affected by an ice-age environment. Some stratification and our analyses suggest that the sediments were formed on a floodplain. The ages of the sediments range from 150 to 130 ka, based on quartz optically-stimulated luminescence (OSL) dating. The absence of sediments younger than 100 ka is likely attributable to a change to sedimentary environments where erosion processes are dominant, with sediments being removed to the Hantangang River area. Meanwhile, a N-S-striking fault, dipping 30° eastward, cut across the sediments during 140–130 ka. This study provides important information on Quaternary sedimentary environment nearby the Hantangang River area, but also the introduction of the Quaternary fault into Chugaryung fault system, which has been lacking to data.

저서성 유공충 군집 및 퇴적물 지화학 조성에서 나타나는 전복양식 활동 영향 및 퇴적환경과의 상관성

정다운,최양호,이연규 한국패류학회 2020 The Korean Journal of Malacology Vol.36 No.4

Geochemical and benthic foraminiferal analyses of sediments (core and surface) were conducted in an abalone farm located at Pyeongil-do, Wando-gun, to understand the degree to which the abalone farming affect the benthic environment and ecology, and relativity to sedimentary environment. The C/S ratio of surface sediment was 8.24 in average (6.77-13.01), and abundance and species diversity of benthic foraminifera were 10,470 individual in 20 ml of sediments and average 3.4, respectively, in the surface sediment, although OM deposited by farming was about 7-19 cm in thickness. The effect of abalone farming on benthic ecology and geochemistry was not distinct. In the northwestern sea of Pyeongil-do and Cheok-do (Zone A), the sedimentation rate was very low (average, 0.23 cm/year), the C/N ratio was high (St. No. 9: 18.50) and Elphidium advenum known to inhabit in the entrance sea area of bay was dominantly distributed. In the adjacent sea area of Pyeongil-do and Cheok-do (Zone A), however, the sedimentation rate was very high (average, 1.73 cm/year), Epistominella naraensis known to inhabit in the open sea area was dominantly distributed. It is consequently thought that abalone farms of northwestern sea of Pyeongil-do and Cheok-do are influenced by the fast flow of Deugryang Bay, and abalone farms of adjacent sea area of them are influenced by the open sea. As mentioned above, these coexistence of various sedimentary environment in farm is thought to be caused by topographical characteristics with irregular coastline of Rias type.

충청남도 금산군 일대 제4기 지질 및 골재자원 분포 특성

김진철(Jin Cheul Kim),김주용(Ju Yong Kim),이진영(Jin-Young Lee) 대한자원환경지질학회 2021 자원환경지질 Vol.54 No.5

하천 및 육상 골재 자원의 주 대상인 모래층의 분포는 제4기 퇴적 환경 중 충적 및 하천 퇴적환경에 주로 속한다. 충청남도 금산군 일대의 골재 자원 분포는 특징적으로 감입곡류 하천이 우세한 퇴적 환경 중심으로 발달하고 있는 반면, 붕적이나 선상지성 퇴적환경에서 형성된 퇴적층은 육상 및 하천 골재 분포 비율이 상대적으로 낮다. 봉황천 주변과 소하천들이 합류하는 부근 일대는 소규모이지만 하천의 범람원이 발달하며 골재 분포 지역에 해당된다. 금산군 제4기 퇴적층의 수직 분포는 약 5~12m 범위와 평균 8m의 제4기 퇴적층 두께를 갖는다. 골재 부존 구간은 평균 3.6m 두께이며 평균 입도는 점토-실트 약 21%, 모래 67%, 그리고 자갈 12%이다. 골재 부존 구간의 주요 특징은 조립질 모래가 우세하고 자갈은 아각형 또는 아원형, 분급은 일반적으로 불량하고 괴상의 형태를 띠며 암회색~황갈색 범위의 토색을 보인다. 금산군 내에서 골재 개발 가능성이 큰 분포 지역은 금강본류, 봉황천과 소하천 지류의 현 하상과 구하상을 따라 분포하는 충적 퇴적층 및 하천 퇴적층이다. Sand layer distribution, which is the main target of river and land aggregate resources, mainly belongs to alluvial and river sedimentary environments among the Quaternary sedimentary environments. The distribution of aggregate resources in the area of Geumsan-gun, Chungcheongnam-do is characteristically developed around a sedimentation environment in which intrusive meandering river dominate. Although the area around Bonhwangcheon Stream and the area near the confluence of small streams are small, the river floodplain develops and corresponds to the aggregate distribution area. The sedimentary layer formed in the sedimentary environment such as colluvial deposits or alluvial fan deposits has a relatively low distribution rate of aggregate resources. The vertical distribution of the Quaternary sedimentary layers in the Geumsan-gun region ranges from about 5 to 12 m and has an average Quaternary sedimentary thickness of 8 m. The aggregate-bearing section has an average thickness of 3.6 m, and the average grain size is about 21% clay-silt, 67% sand, and 12% gravel. The main characteristics of the aggregate-bearing section are that coarse-grained sand predominates, and gravel is sub-angular or sub-rounded, and the sorting is generally poor and has a massive form of deposits, and the soil colour ranges from dark grey to yellowish-brown. In Geumsan-gun, the most likely distribution area for aggregate development is the alluvial sedimentary and river sedimentary layers distributed along the current and former riverbeds of the main Geumgang River, Bonhwangcheon and small River tributaries.

드론 영상을 활용한 금강 하도내 퇴적환경 변화 연구: 세종보 개방을 중심으로

윤혜연,정근비,윤광성,장동호 한국지형학회 2023 한국지형학회지 Vol.30 No.1

In this study, the changes and characteristics of sedimentary environment in Geum River channel by opening gate of Sejong Weir were analyzed using aerial photos and drone images. Sedimentary landform was classified during the study period and it has been found that the changes of area in some classes such as mid-channel island of divided type, mid-channel island of undivided type, sand barrier, and sand island were larger than that of other classes. In addition, the characteristics of area changes of the sedimentary landform were analyzed in this study. As a result, it was determined that erosion and deposition of sediments in the river was depended on the increase of flow rate and velocity by the increase of precipitation particularly during the summer rainy reasons as well as typhoons, growth of vegetation, and efficiency of dam. The results can be used as data to identify the process of conserving endangered wildlife and restoring the naturalness of the river environment.

야외지질학습에서 학습한 퇴적환경에 대한 과학영재와 일반학생의 언어네트워크 비교

조규성,정덕호,서은선,박경진 韓國英才學會 2013 영재교육연구 Vol.23 No.6

The purpose of this study was to compare the difference of semantic network about sedimentary environment between science gifted students and non-gifted students through field trip. The fifteen high school science gifted students and non-gifted students were participated in the field trip for this study. The geological field trip was performed in Chaseokgang, which suitable learning place for sedimentary environments. Data included field trip observation and students’ inquiry activity reports. The inquiry activity reports were analyzed using the semantic network analysis method. The results of this study were as follows: First, the semantic network of science gifted students was larger and complex structures than that of the non-gifted students. Second, science gifted students were interpreted that changes of sedimentary environment was connected with the sorting and the roundness. On the other hand, semantic network of non-gifted students were become fragmented because they were not interpreted sedimentary environment related to scientific concepts. 본 연구의 목적은 야외지질학습에서 학습한 퇴적환경에 대한 언어네트워크가 과학영재와 일반학생에 따라 어떤 차이가 있는지 알아보기 위한 것이다. 이를 위하여 각각 15명의 과학영재와 일반학생을 연구 대상으로 선정하였으며, 퇴적환경의 학습장소로 적절한 채석강에서 야외 지질학습을 수행하였다. 자료 수집은 야외지질학습 관찰 및 학생들의 탐구활동 보고서를 통해 이루어졌으며, 이렇게 수집된 보고서는 언어네트워크분석을 이용하여 분석하였다. 분석 결과 첫째, 야외지질학습 동안 학습된 퇴적환경에 대한 언어네트워크는 과학영재들이 일반학생에 비해 더 크고 복잡한 구조를 이루고 있었다. 둘째, 과학영재는 퇴적물을 이루는 자갈의 특성을 분급, 원마도 등의 개념과 관련지어 퇴적환경을 적절히 해석하고 있었지만 일반학생들은 퇴적 환경과 관련된 개념이 파편화되어 사용되고 있었다.

한국의 간석지 연구

장동호 ( Dong Ho Jang ) 한국지형학회 2011 한국지형학회지 Vol.18 No.4

본 연구에서는 우리나라의 간석지 연구사를 유형별 및 시기별로 정리하였다. 간석지 연구사는 크게 간석지 퇴적물 연구, 위성영상을 이용한 연구, 제4기 환경변화와 간석지에 관한 연구, 그리고 간석지의 생태학적 연구 등 4개 분야로 구분하였다. 한국의 간석지 연구사를 종합적으로 살펴보면, 간석지 연구는 일제시대 때부터 있었으나 대부분 수산업에 관계된 연구들이었다. 이후 1960년대에는 간척사업으로 인해 형성된 간척지를 대상으로 하는 연구에 집중되었다. 지형학적인 관점에서의 간석지에 관한 연구는 1970년대에 본격적으로 시작되어 1980년대 이후부터 간석지의 중요성이 알려지면서 더욱 활기를 띠게 되었다. 특히, 퇴적환경과 지표 형태 및 생태계, 지형 변화에 관한 연구가 주를 이루었으며, 2000년대 이후에는 위성영상 자료와 현장조사를 병행하여 접근하기 어려운 간석지의 퇴적상 및 퇴적환경 변화를 지속적으로 모니터링 하는 연구가 진행되었다. 우리나라의 간석지에 관한 지리학 분야에서의 학술연구는 다수 진행되었지만, 지형학에서의 간석지 연구 성과는 소수에 의해 진행되어 여전히 블루오션과 같은 분야이다. 따라서 향후 더 많은 지형학자의 관심 속에서 우리나라의 간석지에 대한 다양한 연구가 진행되어 지형학에서의 주요 연구 분야로 정착하기를 기대한다. In this study, the tidal flat research history of South Korea was organized by type and period. South Korea`s tidal flat research history was largely divided into four fields: sediment research of tidal flat, research using satellite imagery, research on the Quaternary environment change and tidal flats, and ecological research on tidal flats. The comprehensive review of the South Korean tidal flat research history showed that tidal flats had been researched on since the period of Japanese colonial period, but most of the past studies were related to fisheries. Then, in the 1960s, the studies started to focus on the reclaimed land created through reclamation projects. The research on tidal flats from a geomorphological perspective fundamentally started in the 1970s, and the importance of tidal flats became more widely known in the 1980s. Most of the studies then were about the sedimentary environment and the form of landform, the ecosystem, and morphological changes. Since the 2000s, research has been carried out on satellite imagery data together with field survey, to continuously monitor the changes in the sedimentary facies of tidal flats, and in the sedimentary environment. There have been many academic studies on the geographic field of tidal flats, but the research performance on tidal flats in terms of geomorphology is still a blue ocean that has been touched by only a few. Therefore, it is hoped that various studies on Korean tidal flats will be conducted by geomorphologists in the future, and that such area will be established as an important field of study in geomorphology.

대한해협 해저사퇴 심부코어 SSDP-101의 퇴적상과 퇴적환경

김성필,양우헌 한국지구과학회 2023 한국지구과학회지 Vol.44 No.5

대한해협 대륙붕 해저사퇴의 형성과정을 이해하기 위해 77m 심도 심부 SSDP-101 코어를 연구하였다 . 이 심부코어는 WGS 측지계 기준으로 북위 128도 16.335분, 동경 34도 19.666분에 위치한 수심 60m의 사퇴 정상부에서 시추하였다 . SSDP-101 코어 시료의 해양지질학적 분석은 제4기 후기 상대 해수면 변화에 의해 야기된 대한해협 대륙붕 퇴적환경의 변화를 밝혔다 . 하부 코어 퇴적층은 간헐적 하천 범람이 일어나는 염하구 환경에서 형성된 것으로 해석되었다 . 연구 지역의 사퇴는 상대해수면이 현재보다 더 낮은 시기에 형성되었고 , 사퇴 퇴적물은 상대해수면이 상승함에 따라 키질작용을 받았다 . 현재 대륙붕의 해저사퇴는 해수면이 낮았던 시기의 해저사퇴가 현재 해수면 환경까지 잔존된 결과로해석된다 . A long core SSDP-101 of 77 m in a submarine sand ridge on the Korea Strait shelf was studied to understandthe formation process of the sand ridge. The long core was drilled at 128o16.335'N in latitude and 34o19.666'E inlongitude (WGS-84) on the top of the sand ridge of 60-m water depth. Marine geological analyses of the SSDP-101long-core samples can reveal the changing sedimentary environments in the Korea Strait Shelf caused by relative sea-levelchanges during the late Quaternary. The lower parts of the core samples were interpreted as episodic stream-floodingsediments occurring in an estuarine environment. The sand ridge of the study area formed when the relative sea level waslower than the present sea level, and the sand ridge sediments were winnowed by the relative sea level rise. Thesubmarine sand ridge in the modern shelf is interpreted that the sand ridge of the lower sea level has remained to thepresent higher sea level.

광양만 연구의 현황과 앞으로의 과제

이문옥(Moon Ock Lee),김종규(Jong Kyu Kim),김병국(Byeong Kuk Kim) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10

본 연구에서는 광양만과 관련하여 지난 40여년간 한국학술지인용색인(KCI) 및 과학인용지수(SCI)에 게재된 105편의 학술논문을 분석하여 광양만 해양 환경의 과거와 현재의 모습을 진단하고, 앞으로 광양만의 환경 보전과 회복을 위해 필요한 연구과제를 모색하였다. 광양만에서는 어류의 식성 및 종조성과 관련한 연구가 가장 많았고, 다음으로 퇴적환경(또는 퇴적상), 수치모델링, 수질, 동식물 플랑크톤 등의 연구가 많았다. 그 결과, 광양만의 해양환경은 개발 이전인 1980년대 초기에 비해 2020년 현재 유동은 물론, 수질과 저질환경은 악화하였고, 어류(부유성 난, 자치어)와 해조류 출현종수는 감소한 것으로 밝혀졌다. 또한 퇴적층에서는 환경에 유해한 내분비계 교란물질과 중금속이 발견되었고, 유기오염을 지시하는 저서동물, 빈산소수괴 등이 출현하는 것으로 나타났다. 따라서 광양만의 연구는 앞으로 이러한 환경 문제를 근본적으로 해결할 수 있는 방안을 찾는 데 집중해야 할 것으로 판단된다. 이를 위해서는 광양만내의 해양생태계를 고려한 환경친화적 개발과 보전방안, 즉, 지속가능한 개발 방안을 마련하기 위해 필요한 연구를 조속히 수행해야 할 것으로 생각된다. We extensively reviewed 105 scientific journals that have been published in relation to the research of Gwangyang Bay, Korea over the last four decades, in order to find a solution to the conservation and restoration of the marine environment of Gwangyang Bay in the future. Majority of the studies appeared to be related to feeding habits of fish and its composition, sedimentary facies, numerical modelling, water quality, and phytoplankton and zooplankton. As a result, the marine environments of Gwangyang Bay as of 2020 deteriorated rather than the early 1980s, in terms of flow situation, water quality, sedimentary environment, and decrease in fish(floating juvenile and eggs) and algae populations. Furthermore, endocrine-disrupting chemical and heavy metals were found in the sediments, and in some areas benthos for indicator of organic contamination and oxygen-deficient water masses also appeared. Therefore, it is judged that the future study will have to focus on finding a solution to these environmental issues in order to restore marine ecosystems of Gwangyang Bay. That’s why it is urgently required to prepare environmentally-friendly development, i.e. a sustainable development of Gwangyang Bay, and their conservation measures.

경기만 서부 덕적도 사퇴의 탄성파층서 및 퇴적환경 연구

이윤오 ( Yoon Oh Lee ),최상일 ( Sang Il Choi ),정교철 ( Gyo Cheol Jeong ) 대한지질공학회 2014 지질공학 Vol.24 No.1

서해 경기만의 덕적도 서부에 발달하고 있는 사퇴해역에서 획득된 고해상 탄성파탐사자료, 해저면측사탐사자료, 표층퇴적 물 및 주상코어시료에 대한 정밀분석과 연구가 실시되었다. 탄성파탐사 자료에 의하면 사퇴의 층서는 3개의 퇴적단위(sequence I, II, III)로 구분되어진다. 최상부 퇴적단위 I은 14C 연대측정 자료에 의하면 5,000~6,000 yr BP경 본 해역이 해침을 받은 후 강한 왕복성 조류에 의하여 형성된 것으로 사료된다. 퇴적단위 II는 주상코어 자료에 의하면 니질이 주로 분포하는 고 조간대 니질퇴적층으로 추정된다. 퇴적단위 III은 중생대에 관입한 화강암으로 분포된 음향기반암 상부에 플라이 스토세 말기로 추정되는 육성퇴적층인 자갈 내지는 조립질 퇴적물이 부정합으로 퇴적된 것으로 판단된다. 해저면측사탐사 자료에 의하면 사퇴 정상의 해저면은 모래파가 발달되어 있으며, 이는 대체로 조류의 방향과 일치하는 N20°W 방향이다. 사퇴 정상부에서 멀어지면 모래물결자국이 발달하고, 경사면에서는 균질한 사질로 분포한다. 표층퇴적물과 주상퇴적물(시료VC-1, 2, 3)은 특정 내부 구조를 갖지 않는 비교적 균질한 중립토 내지 세립토(Mz, 1-2φ)로 분포하는 특징을 보인다. We examined high-resolution seismic data, side scan sonar data, surface sediments, and vibrocore samples from a sand ridge off the western part of Dukjuk-Do in Gyeonggi Bay, with the aim of interpretation of seismic stratigraphy and sedimentary environment. Based on the seismic data, the deposited sands are divided into three sedimentary units. 14C age data indicate that the top sequence (sequence I) formed at 5000-6000 yr BP, when a transgression resulted in strong shifting tides. Analyses of the vibrocore samples indicate that sequence II is a paleo-mudflat layer of intertidal sediments dominated by mud. Sequence III consists of terrestrial sediments that are presumed to have been deposited at the end of the Pleistocene, unconformably overlying the acoustic bedrock and Mesozoic granite. The side scan sonar data indicate that sand waves were formed on the seabed on top of the sand ridge. Generally, this is the direction of N20oE, which coincides with the direction of tidal flow. Sand ripples occur away from the top of the sand ridge and are distributed homogeneously across a sandy slope. Vibrocore analyses indicate that the surface sediments and core sediments (samples VC-1, -2, and -3) are homogeneous, without any internal structures, and are characterized by a mixture of medium and fine sand (1-2φ), respectively.