순천만과 보성벌교 연안습지의 퇴적환경과 퇴적률

고영구 ( Yeong Koo Koh ),오강호 ( Kang Ho Oh ),윤석태 ( Seok Tai Youn ),박성남 ( Seong Nam Park ),차성식 ( Seong Sig Cha ) 한국도서학회 2016 韓國島嶼硏究 Vol.28 No.1

연구지역인 순천만과 보성벌교 갯벌은 우리나라 남해안에 위치하는 반폐쇄형 연안습지로 보전가치가 높은 지형 및 지질을 비롯한 생태계가 우수하여 2003년에 습지보호지역 제3호와 제4호로 지정되었으며, 2006년에는 람사르(Ramsar)에 등록되어 있다. 이 연구는 순천만과 보성벌교 연안습지의 계절적 퇴적환경과 퇴적률 변화를 살펴보기 위하여 조간대 표층퇴적물을 분석하고 퇴적률을 조사하였다. 계절에 따른 평균 입도는 5월에 조립화되는 경향이 강하고, 8월과 11월에 다시 세립화 하는 특성을 보인다. 퇴적물의 분급도는 불량한 분급에서 극단적 불량한 분급이며, 그 범위는 0.05Φ로 계절에 따른 유의할 만한 변화는 없다. 퇴적상은 역질니, 미량의 역질니, 사질니, 니의 4개 퇴적상이며, A 지역을 제외하고 니(M)의 세립질 퇴적물로 구성된다. 계절에 따른 퇴적환경 변화는 침식과 퇴적이 반복적으로 전개되며, 변화 경향은 연속적으로 퇴적되는 유형, 침식과 퇴적이 반복되면서 퇴적되는 유형, 침식과 퇴적이 반복되면서 침식되는 유형으로 나누어진다. 우리나라 남해안과 서해안 연안습지는 대체로 침식과 퇴적이 반복되면서 퇴적되는 양상을 많이 보이나, B-1과 F-1의 퇴적환경은 침식 경향이 강하다. B-1은 순천만 복원을 위한 정비 사업으로 내륙 쪽의 매립과 준설이 진행되고 있으며, F-1 지역은 보성벌교 꼬막축제현장으로 매년 11월에 지역축제행사를 개최하였다. 이들 지역에서 우리나라 연안습지의 퇴적환경 변화와 상이한 결과는 개발 및 행사 등의 활용에 따른 인위적 영향이 작용하였음을 강하게 시사한다. 계절에 따른 퇴적률은 -0.21㎝/yr에서 11.07㎝/yr으로 우리나라 서해안과 남해안의 반폐쇄형 연안습지 환경과 유사하다. 그러나 세부적으로 이들 지역 정점 B-1에서는 연속적 퇴적이 일어나고 정점 F-1에서는 침식 경향이 강조된다. 정점 B-1 지역은 순천만 복원을 위한 정비 사업으로 매립과 준설이 진행되고 있다. F-1 지역은 2008년부터 2014년까지 보성벌교 꼬막축제현장으로 매년 11월에 지역축제행사를 개최하고 있다. 이들 지역의 퇴적환경 변화는 개발 및 행사 등에 따른 인위적 영향이 작용함을 배제할 수 없다. 따라서 인위적 영향과 유관한 것으로 보이는 연안습지 지역의 퇴적환경은 지속적인 모니터링을 통해 명확한 계절적 퇴적환경 변화와 그 영향을 파악할 필요성이 있다. This study carried out an analyses on the surface sediments of the intertidal zone and their accumulation rates in relation to the annual environmental changes of the coastal wetlands in Sucheon Bay and Boseong-Beolgyo. In these areas, the seasonal mean grain sizes of sediments are coarsening in May, but in October and September the sizes are fining. The sediments are poorly to extremely poorly sorted and shows 0.05Φ in interval with no noticeable variation. The sediments are composed of gM, (g)M, sM and M in facies. The M facies is dominant except for the A area within the study area. In the areas, the tides mainly influence grain sizes, sorting and sedimentary facies while rainfalls relate with the environmental changes of the area as well as occasional changes of water discharge. The depositional environments show seasonal repetitions of erosion and deposition. The seasonal sedimentation rates within the areas are around -0.21㎝/yr to 11.07㎝/yr, resembling the semi-closed coastal wetlands of the South and West coasts of Korea. On the other hand, station B-1 has a continuous deposition, while station F-1 is erosive in the areas. In station B-1, burial and dredging constructions are in progress in line with the restoration of Suncheon Bay. In station F-1, the local annual September clam festivals of Boseong-Beolgyo were held from 20008 to 2014. Thus, artificial effects by those things exert some environmental influences to the areas. In conclusion, it is necessary that the seasonal sedimentary environmental changes of the areas must be monitored on the bases of this research.

영산강 부유하중의 시계열적 입도 특성 변화: 승촌보, 죽산보를 중심으로

임영신,김진관 한국지형학회 2019 한국지형학회지 Vol.26 No.4

In order to establish appropriate policy to control sediment-associated problems, it is necessary to identify the physical characteristics of the reservoir sediments in particulate form in the Yeongsan River. Two time-integrated suspended sediment samplers were installed at Seungchon and Juksan weir on the upper and middle Yeongsan River in July 2012. Reservoir sediment samples were obtained at monthly intervals until October 2014. During the monitoring period, a total of 38 sediment samples were obtained and analyzed. Seasonal trends of suspended sedimentation rates and grain size distributions were examined based on variations in precipitation and discharge fluctuations. Moreover, stream flow characteristics, which has a great influence on the physical characteristics of the river sediment, was analyzed using flow duration curve for the period 2003-2019 at Naju gauging station. Sedimentation rates during summer, when heavy rainfall was concentrated due to the monsoonal front and typhoon, were very high, indicating the positive relationship between sediment concentration and discharge. Particle size analysis of the collected sediment showed that coarse silt and very fine sand-sized sediment dominated most of the Seungchon weir sediment. On the other hand, medium silt-sized sediment dominated the downstream Juksan weir except for a few summer samples. These results implied that the physical characteristics of the suspended sediment are determined not only due to flow fluctuations, but also with regard to the antecedent rainfall conditions, hillslope-channel connectivity, and the supply of materials from various contributing regions. This information about flow characteristics and temporal variations in reservoir sediment can be used for safe management of the weir and discussing the issues on the dismantling of the weirs.

법성포 연안의 퇴적환경과 퇴적률

오강호 ( Kang Ho Oh ),정철환 ( Chull Hwan Chung ),윤석태 ( Seok Tai Youn ),김해경 ( Hai Gyoung Kim ),고영구 ( Yeong Koo Koh ) 한국도서(섬)학회 2010 韓國島嶼硏究 Vol.22 No.3

Considering the change of depositional environments in inter and littoral zones of the Beopseongpo area, surface sediments and accumulation rates were investigated during Dec. of 2007 to Oct. of 2009 in the areas. The intertidal zones are composed of (g)M, sZ, mZ, Z and M in facies, mostly bearing silt and clay. The sediments in the zones are 4.72 to 7.58Ø in mean grain size, 1.43 to 3.47Ø in sorting, and 0.12 to 0.66 in skewness, respectively. In the subtidal zones, the sediments are gmS, (g)mS, (g)S, (g)M, S, zS, zC, sZ and Z in facies with high contents of sand and silt. And the sediments are -0.08 to 6.11Ø in mean grain size, 0.50 to 3.81Ø in sorting, -0.14 to 0.89 in skewness, respectively. According to the modal analyses of above zones, inter and littoral zones are unimodal and bimodal in each. The bimodal mode might be inferred as the results of abrupt environmental changes or reworking. The accumulation rates in the areas indicate the predominating accumulation areas of -6.36 to 20.81㎜/yr (8.91㎜/yr in avg.)rates. The phenomena are inferred as the influences of the influx of Watan stream, tides, several currents, climatic conditions and surrounding topographies.

울릉분지 천부 퇴적층에서의 가스 생성과 천연가스 하이드레이트 형성 잠재력

류병재(Ryu, Byong-Jae),이영주(Lee, Young-Joo),김지훈(Kim, Ji-Hoon),김일수(Kim, Il-Soo),박명호(Park, Myong-Ho) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06

Basic studies on natural gas hydrates in the East Sea were been carried out by the Korea Institute of Geoscience and Mineral Resources (KIGAM) from 2000 to 2004 involving 2D multichannel seismic lines and piston coring. 27 piston cores recovered from the deed-water Ulleung Basin of the East Sea were analyzed in this study. In piston cores cracks generally developed parallel to bedding suggest significant gas content. The core analyses showed high total organic carbon (TOC) content, sedimentation rate and heat flow of sediments. The cores recovered from the southern study area show also high residual hydrocarbon gas concentrations for the formation of natural gas hydrates. This study indicates that there is the potential for the generation of biogenic gas and the formation of natural gas hydrates in the near seafloor sediments of the study area.

마산항 점착성 퇴적물의 퇴적특성에 대한 실험적 연구

양수현(Su-Hyun Yang),김남훈(Nam Hun Kim),황규남(Kyu-Nam Hwang) 한국해안해양공학회 2015 한국해안해양공학회 논문집 Vol.27 No.6

본 연구에서는 자연시료에 대한 퇴적 매개변수를 정량적으로 산정하기 위하여, 환형수조를 이용한 퇴적실험이 수행되었다. 퇴적실험을 위해 마산항이 대표 해역으로 선정되어 시료가 채취되었으며, 퇴적실험은 초기농도가 동일한 조건에서 바닥전단응력의 크기만을 변화시키면서 총 18회의 실험이 수행되었다. 퇴적실험 결과, 마산항 갯벌 점착성 퇴적물의 최소전단응력 Tbmin과 퇴적률 매개변수 σ1 및 (T<SUP>*</SUP>b-1)50은 각각 0.10 N/m<SUP>2</SUP>, 0.54, 0.87로 산정되었으며, 과거 타 연구결과와의 비교•검토를 통하여 본 실험에서 도출된 결과의 타당성이 입증되었다. In this study, a series of deposition tests have been performed using an annular flume in order to estimate depositional parameter of natural sediments. The sediment of Masan Port has been collected for deposition tests, and total 18 deposition tests have been carried out on different bed shear stress respectively but with the same initial concentration. As the results, the minimum bed shear stress Tbmin, standard deviation σ1 and time scale parameter (T<SUP>*</SUP>b-1)50 are found to be 0.10 N/m<SUP>2</SUP>, 0.54 and 0.87 respectively. Through comparing with results from previous studies for other sediments, the results of this study are shown to be good enough to verify.

납 동위원소 연대측정을 이용한 시화호 내측 우음도의 퇴적환경 복원

임영신,최한우,양동윤,김진관 한국지리학회 2023 한국지리학회지 Vol.12 No.1

After the completion of the embankment, changes occurred in Lake Sihwa that connected the islands to the mainland. In this study, we tried to analyze the changes in the sedimentary environment recorded in the core samples obtained from the tidal flats south of Ueum Island inside Sihwa Lake. For this purpose, land use and aerial photographs were analyzed by time period in the Sihwa Lake basin, and the sedimentation age of the core samples was determined using the lead-210 dating method, and the change in sedimentation rate was analyzed. As a result of the sedimentation rate change, two large peaks appeared. The first represents a low-energy environment that occurred when seawall construction was completed and restricted sediment runoff to the sea. The second occurred when the reclamation of Ueum Island tidal flats increased and the tidal flats were blocked and a reservoir environment was created at the sampling site. These results indicate that changes in sediment input and outflow conditions near the sampling site had a bigger impact on sedimentation rates in the interior of the tidal flat, located far from the main tidal channel, than the construction of the Shihwa seawall.

고령토 퇴적물의 퇴적특성에 대한 실험적 연구

황규남(Hwang Kyu-Nam),양수현(Yang Su Hyun) 대한토목학회 2007 대한토목학회논문집 B Vol.27 No.6B

미세 점착성 퇴적물의 퇴적률 산정 기법 및 산정 결과에 대한 타당성 검증을 목적으로 고령토 퇴적물에 대한 일련의 퇴적실험이 국내 최초로 환형수조를 이용하여 수행되었다. 각 퇴적 실험은 동일 초기농도 조건에서 바닥전단응력의 크기를 변화시키면서 수행되었는데, 이 결과로부터 고령토 접착성 퇴적물의 최소전단응력(또는 퇴적한계전단응력), 평형농도, 퇴적률 및 퇴적특성 매개변수들에 대한 정량적 평가가 이루어졌다. 또한 본 연구에서 도출된 퇴적 매개변수 및 특성치들은 과거 타 연구결과와의 비교검토를 통하여 검증되었다. 본 연구에서 사용된 환형수조는 점착성 퇴적물의 퇴적특성 측정을 위한 장치로 그 성능 상에 문제가 없음이 간접적으로 확인되었으며 퇴적실험 방법 및 실험 결과의 타당성이 입증되었다. A series of deposition tests for kaolinite sediments has been conducted using an annular flume, in order to develop the estimating tools (or equations) for depositional properties of fine cohesive sediments and to verify their validities. Each deposition tests has been carried out in different bed shear stresses respectively but with the same initial concentration, from which minimum shear stress (or critical shear stress for deposition), equilibrium concentration, the deposition rates and relevant deposition parameters for kaolinite sediments have been quantified. In addition, depositional parameters and properties estimated in this study are compared with the results from previous studies, in order to evaluate the validity of the present experimental results. It is confirmed indirectly that the performance of the annular flume is good enough to measure the depositional properties of fine cohesive sediments and the experimental method and results are valid.

염도 존재시 고령토 퇴적물의 퇴적특성 산정에 관한 실험적 연구

황규남,김남훈,이영호 한국수자원학회 2008 한국수자원학회논문집 Vol.41 No.9

본 연구에서는 환형수조를 이용한 일련의 퇴적실험을 수행하여, 염수조건(32 %o)에서의 고령토 퇴적물의 퇴적특성 산정 및 퇴적특성에 미치는 초기농도의 영향을 분석 검토하였다. 바닥전단응력을 변화시키면서 각기 다른 3가지 초기농도조건(1000, 5000, 15000 ppm)에서 총 37회의 퇴적실험이 수행되었으며, 퇴적실험 결과로부터 염수조건에서 고령토 퇴적물의 최소전단응력(또는 퇴적한계전단응력; )과 퇴적률 매개변수들()의 정량적 산정 및 초기농도와 염 In this study, a series of deposition tests have been conducted on saltwater condition(salinity 32 %o) using an annular flume, in order to estimate depositional properties of kaolinite sediments and to analyze the effect of the initial concentration on th

북아메리카 사막 지형에 미친 인류의 영향: 피닉스, 애리조나 지역을 사례로

정아라 한국지형학회 2019 한국지형학회지 Vol.26 No.3

Humans have been important driver to reconfigure the terrestrial surface of the Earth by altering its morphology and processes. The effect of human activities on the physical landscape, however, shows substantially uneven geographical patterns. Most of anthrogemorphoogical studies regarding human-induced denudation have focused on areas with a long history of human modifications such as humid landscapes, so the hypothesis is naturally a great human impact on landscapes. The effect of human activities on dryland Earth surfaces are far less commonly studied, although erosion is one of major concerns in arid and semiarid region regarding land and water quality degradation. The urban metropolis of Phoenix, Arizona, USA provides an opportunity to explore the impact of the Anthropocene. The Phoenix metropolitan area rests on classic desert landforms, such as extensive pediments, alluvial fans and sand sheets. Human activities including cattle crazing, wildfire resulting from introduced grass species by human, and recent urbanization processes have impacted these classic desert landforms and altered geomorphic processes. The purpose of this paper, therefore, rests in examining Anthropocene in the geomorphology of the north-central Sonoran Desert. The objectives of this paper are: i) to understand the impact of the Anthropocene on the geomorphological processes and forms through field observations; ii) to quantify the magnitude of human impacts on landscape using a published two-decade long record of erosion dataset and natural background erosion dataset in submitted manuscript at the sprawling edge of the Phoenix metropolitan region; iii) to examine how geomorphic outcome can affect the sustainability of cities through the estimation of sediment yield under the condition of urban sprawl.

Very young Gotjawal lavas (aged < ca. 10 ka) on Jeju Island, Korea : The major causes of Gotjawal formation

안웅산(Ung San Ahn),최형순(Hyeong Sun Choi) 대한지질학회 2016 지질학회지 Vol.52 No.4