Tracing the Origin of Pb using Stable Pb Isotopes in Surface Sediments along the Korean Yellow Sea Coast

박종규,최만식,송윤호,임동일 한국해양과학기술원 2017 Ocean science journal Vol.52 No.2

To investigate the factors controlling lead (Pb) concentration and identify the sources of Pb in Yellow Sea sediments along the Korean coast, the concentration of Pb and Pb isotopes in 87 surface and 6 core sediment samples were analyzed. The 1 M HCl leached Pb concentrations had a similar geographic distribution to those of fine-grained sediments, while the distribution of residual Pb concentrations resembled that of coarse-grained sediments. Leached Pb was presumed to be associated with manganese (Mn) oxide and iron (Fe) oxy/hydroxide, while residual Pb was associated with potassium (K)-feldspar, based on good linear relationships between the leached Pb and the Fe/Mn concentrations, and the residual Pb and K concentrations. Based on a ratio–ratio plot with three isotopes (207Pb/206Pb and 208Pb/206Pb) and the geographic location of each sediment, sediments were categorized into two groups of samples as group1 and group2. Group 1 sediments, which were distributed in Gyeonggi Bay and offshore (north of 36.5°N), were determined to be a mixture of anthropogenic and natural Pb originating from the Han River, based on a 208Pb/206Pb against a Cs/Pbleached mixing plot of core and surface sediments. Group 2 sediments, which were distributed in the south of 36.5°N, also showed a two endmembers mixing relationship between materials from the Geum River and offshore materials, which had very different Pb concentrations and isotope ratios. Based on the isotopes and their concentrations in core and surface sediments, this mixing relationship was interpreted as materials from two geographically different origins being mixed, rather than anthropogenic or natural mixing of materials with the same origin. Therefore, the relative percentage of materials supplied from the Geum River was calculated using a two endmembers mixing model and estimated to be as much as about 50% at 35°N. The spatial distribution of materials derived from the Geum River represented that of fine-grained sediments originating from the Geum River. It was concluded that Pb isotopes in sediments could be used as a tracer in studies of the origin of fine-grained sediments along the Korean Yellow Sea coast.

사방댐 준설퇴적물 관리시스템 개발 및 관리기준 제안

송영석,윤중만,정인근 한국지반신소재학회 2018 한국지반신소재학회 논문집 Vol.17 No.4

사방댐 배면의 준설퇴적물에 대한 준설시기를 객관적, 정량적, 과학적으로 결정할 수 있도록 준설퇴적물 측정장치를 개발하고실제 현장에 시범 구축하였다. 사방댐 배면의 준설퇴적물 하중을 측정하기 위하여 준설퇴적물 관리시스템을 설계 및 개발하였다. 본 관리시스템은 Data Acquisition System (DAS), Solar System 및 준설퇴적물 하중변화 측정유닛으로 구성되어 있다. 또한 사방댐 배면의 준설퇴적물 하중, 수위 및 강우량을 실시간으로 측정하고 무선통신을 통하여 자료를 전송할 수 있다. 준설퇴적물 하중변화 측정유닛은 강우를 측정하기 위한 강우계, 사방댐 배면의 준설퇴적물 하중을 측정하기 위한 하중측정계, 사방댐 배면 수위를 측정하기 위한 수위계로 구성되어 있다. 사방댐 배면의 준설퇴적물 관리기준은 준설퇴적물의 하중을기준으로 제안하였다. 사방댐 배면에 퇴적될 수 있는 최대 준설퇴적물의 양을 산정하고, 최대 준설퇴적물의 50%, 70% 및90%가 쌓인 경우 관심, 주의 및 경보의 단계로 구분하여 관리기준을 마련하였다. 사방댐 배면의 준설퇴적물 관리시스템을활용하여 현재 준설퇴적물의 하중을 실시간으로 측정할 수 있으며, 이를 토대로 사방댐의 상태와 준설퇴적물의 준설시기를결정할 수 있을 것으로 판단된다. The dredged sediment management system was developed to have an objective, quantitative and scientific decision for the optimum removal time of dredged sediments behind debris barrier and was set up at the real site. The dredged sediment management system is designed and developed to directly measure the dredged sediments behind debris barrier in the field. This management system is composed of Data Acquisition System (DAS), Solar System and measurement units for measuring the weight of dredge sediments. The weight of dredged sediments, the water level and the rainfall are measured in real time using the monitoring sensors, and their data can be transmitted to the office through a wireless communication method. The monitoring sensors are composed of the rain gauge to measure rainfall, the load cell system to measure the weight of dredged sediments, and water level meter to measure the water level behind debris barrier. The management criteria of dredged sediments behind debris barrier was suggested by using the weight of dredged sediments. At first, the maximum weight of dredged sediments that could be deposited behind debris barrier was estimated. And then when 50%, 70% and 90% of the maximum dredged sediments weight were accumulated behind debris barrier, the management criteria were divided into phases of Outlooks, Watch and Warning, respectively. The weight of dredged sediments can be monitored by using the dredged sediment management system behind debris barrier in real time, and the condition of debris barrier and the removal time of dredged sediments can be decided based on monitoring results.

Variation in Microbial Biomass and Community Structure in Sediments of Peter the Great Bay (Sea of Japan/East Sea), as Estimated from Fatty Acid Biomarkers

Zhukova Natalia V. The Korean Society of Oceanography 2005 Ocean science journal Vol.40 No.3

Variation in the microbial biomass and community structure found in sediment of heavily polluted bays and the adjacent unpolluted areas were examined using phospholipid fatty acid analysis. Total microbial biomass and microbial community structure were responding to environmental determinants, sediment grain size, depth of sediment, and pollution due to petroleum hydrocarbons. The marker fatty acids of microeukaryotes and prokaryotes - aerobic, anaerobic, and sulfate-reducing bacteria - were detected in sediments of the areas studied. Analysis of the fatty acid profiles revealed wide variations in the community structure in sediments, depending on the extent of pollution, sediment depth, and sediment grain size. The abundance of specific bacterial fatty acids points to the dominance of prokaryotic organisms, whose composition differed among the stations. Fatty acid distributions in sediments suggest the high contribution of aerobic bacteria. Sediments of polluted sites were significantly enriched with anaerobic bacteria in comparison with clean areas. The contribution of this bacterial group increased with the depth of sediments. Anaerobic bacteria were predominantly present in muddy sediments, as evidenced from the fatty acid profiles. Relatively high concentrations of marker fatty acids of sulfate-reducing bacteria were associated with organic pollution in this site. Specific fatty acids of microeukaryotes were more abundant in surface sediments than in deeper sediment layers. Among the microeukaryotes, diatoms were an important component. Significant amounts of bacterial biomass, the predominance of bacterial biomarker fatty acids with abundance of anaerobic and sulfate-reducing bacteria are indicative of a prokaryotic consortium responsive to organic pollution.

가로림만 점착성 퇴적물에 대한 침식매개변수의 지엽적⋅계절적⋅공간적 변화 연구

양수현,허제우,유홍열,황규남 (사)한국연안방재학회 2019 한국연안방재학회지 Vol.6 No.4

In this study, erosion experiments using an annular flume of Chonbuk National University were carried out to quantify the erosion properties of cohesive sediments from Garorim Bay. The erosion properties were analyzed in connection with the physico-chemical properties of cohesive sediment, and analysis of local, seasonal and spatial variation was carried out. Erosion tests were conducted total 18 times for sediment samples collected twice in the fall and winter at two sites in Garorim Bay, and were performed under a uniform bed condition but a different bed density respectively. For Garorim Bay sediments, it can be seen that  increases from 0.20 N/m2 to 0.48 N/m2 and  decreases exponentially from 133.28 mg/cm2/hr to 7.33 mg/cm2/hr, as the bed density varies from 1.15 g/cm3 to 1.40 g/cm3, local and seasonal variation were almost negligible. The erosional parameters of Garorim Bay sediments are found to be remarkably different in quantity as compared with those for cohesive sediments from other sites. Particularly,  for Garorim Bay sediments is known to be larger than that of Kunsan sediments but similar with that of Sihwa sediments, while  for Garorim Bay sediments is shown to be larger than that for Sihwa sediments and to be smaller than that for Kunsan sediments.

Heavy Metal Contamination and Spatial Differences in Redox Condition of the Artificial Shihwa Lake, Korea

Hyun, Sangmin,Kim, Eun-Soo,Paeng, Woo-Hyun 한국환경과학회 2004 한국환경과학회지 Vol.13 No.5

Five sediment cores from the tidal flat of artificial Lake Shihwa are analyzed in terms of sedimentology and geochemistry to evaluate the heavy metal contamination and redox condition of surficial sediment following the Shihwa seawall construction. The variability of concentrations of various elements depends on the depositional environment, and reflects the various redox conditions and sediment provenances. The amounts of Ti and Al and their ratio of Ti/Al with respect to Li clearly indicate that there is an anthropogenic contribution to the surficial sediment. The high concentrations of heavy metals suggest an anthropogenic contribution at ST. 34 and ST. 22. Concentrations of most elements (Cr, Cu, Zn and Pb) are higher near the Shihwa-Banwol industrial complex than in the central part of Lake Shihwa. Concentrations of heavy metal in surficial sediment near the Shihwa-Banwol industrial complex are two to eight times higher than in the center of Lake Shihwa. Enrichment factors (EF), which are normalized by the unpolluted shale, suggests a significant metallic contamination near the Shihwa-Banwol industrial complex (SBIC). The redox condition is divided into two anoxic and mixed oxic/suboxic zones based on the carbon:sulfur (C/S) ratios of organic matter and elemental relationships. Correlations among geochemical elements Mn, U and Mo are significantly different from site to site, and may therefore be an indicator of the spatial redox condition. Controlling factors for switching anoxic/oxic conditions are thought to be water depth and the differences in industrial effluent supply. The variations of the Cu/Mn ratio in the sediments confirms above mentioned spatial differences of a redox condition in part, and therefore shows a location-dependence redox condition in sediments at four other sites. The redox condition of the surficial sediment characteristics of the Shihwa Lake are controlled by its geographic location and water depth.Five sediment cores from the tidal flat of artificial Lake Shihwa are analyzed in terms of sedimentology and geochemistry to evaluate the heavy metal contamination and redox condition of surficial sediment following the Shihwa seawall construction. The variability of concentrations of various elements depends on the depositional environment, and reflects the various redox conditions and sediment provenances. The amounts of Ti and Al and their ratio of Ti/Al with respect to Li clearly indicate that there is an anthropogenic contribution to the surficial sediment. The high concentrations of heavy metals suggest an anthropogenic contribution at ST. 34 and ST. 22. Concentrations of most elements (Cr, Cu, Zn and Pb) are higher near the Shihwa-Banwol industrial complex than in the central part of Lake Shihwa. Concentrations of heavy metal in surficial sediment near the Shihwa-Banwol industrial complex are two to eight times higher than in the center of Lake Shihwa. Enrichment factors (EF), which are normalized by the unpolluted shale, suggests a significant metallic contamination near the Shihwa-Banwol industrial complex (SBIC). The redox condition is divided into two anoxic and mixed oxic/suboxic zones based on the carbon:sulfur (C/S) ratios of organic matter and elemental relationships. Correlations among geochemical elements Mn, U and Mo are significantly different from site to site, and may therefore be an indicator of the spatial redox condition. Controlling factors for switching anoxic/oxic conditions are thought to be water depth and the differences in industrial effluent supply. The variations of the Cu/Mn ratio in the sediments confirms above mentioned spatial differences of a redox condition in part, and therefore shows a location-dependence redox condition in sediments at four other sites. The redox condition of the surficial sediment characteristics of the Shihwa Lake are controlled by its geographic location and water depth.

고창 개방형 조간대 표층 퇴적물의 2014년 계절 변화

강솔잎,양우헌,진재화,전승수 한국지구과학회 2016 한국지구과학회지 Vol.37 No.2

고창 개방형 조간대는 황해의 동편, 한국 서남해 연안에 위치하며, 대조차, 개방형 연안, 모래 저질의 특징을 보인다. 본 연구는 고창 조간대에서 표층 퇴적물의 계절별 퇴적상 변화를 연구하였다. 2014년 2월, 5월, 8월, 11월의 사계절에 3개 측선을 따라 총 252개 지점에서 표층 퇴적물을 채취하고 분석하였다. 고창 조간대의 2014년 표층 퇴적물은 주로 세립 사질 퇴적물로 구성되며, 계절별로 겨울에 조립하고, 여름에 세립한 경향을 보였다. 연구 지역 인근의 계절별 파랑과 조위 관측 자료에 근거하여, 고창 조간대의 표층 퇴적작용에 영향을 미치는 요인은 파랑이 조석보다 계절의 변화 효과가 큰 것으로 해석되었다. 겨울에 상대적으로 큰 파고의 파랑 영향으로 표층 퇴적물이 조립한 반면, 여름에는 상대적으로 낮은 파고의 파랑 영향으로 세립한 것으로 해석되었다. 고창 조간대의 2014년 퇴적상 공간 분포는 고조대의 계절별 편차가 저조대에 비해 상대적으로 크게 나타났으며, 고조대 입도가 조립하고 분급이 불량하게 나타났다. 고조대에서 저조대 방향으로 갈수록 입도가 세립해지고 분급이 양호해지며 계절별 편차가 작아졌다. The Gochang open-coast intertidal flat is located in the southwestern coast of Korea (the eastern part of the Yellow Sea), characterized by macro-tidal range, an open-coast type, and sand substrates. This study has investigated seasonal variation in sedimentary facies of surface sediments in the Gochang intertidal flat. In the four seasons of February, May, August, and November, 2014, surface sediments of 252 sites in total were sampled and analyzed along three survey lines. The surface sediments of the Gochang intertidal flat in 2014 consisted mainly of fine-grained sand sediments showing a trend in grain size to be coarser in winter and finer in summer. Based on seasonal wave and tidal level data recorded near the study area, it was interpreted that the seasonal effects of wave were stronger than those of tide as a factor controlling surface sedimentation. High waves in winter resulted in the coarsening trend of grain size in surface sediments, whereas, during summer time, the sediments became finer by relatively low waves. Spatial sedimentary facies of the Gochang intertidal flat in 2014 represented that seasonal deviation of the upper tidal zone was larger than that of the lower tidal zone, hence sediments getting coarser in grain size and poorly sorted in the upper tidal zone. From upper to lower tidal zone, the grain size became finer and sediments were better-sorted, showing smaller seasonal deviations.

시화호 점착성 퇴적물의 침강 특성에 관한 연구

이영재(YOUNG-JAE LEE),이상화(SANG-HWA LEE),황규남(KYU-NAM HWANG),류홍렬(HONG-RYUL RYU) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.4

The sediment of Shihwa Lake contains an abundant quantity of cohesive sediments. The transport processes of the cohesive sediments are complex and difficult to predict, quantitatively. The cohesive sediments are the primary reason for the pollution of the environment and water quality in the coastal region. In this study, a column test has been performed. In order to quantify the settling velocities of sediment from Shihwa Lake, an experiment was conducted using a specially designed 1.8m tall settling column. A series of settling tests and physico-chemical property tests on Shihwa Lake cohesive sediments has been conducted to investigate the correlation between settling properties and their physico-chemical properties, which are represented as grain size distribution, mineralogical composition, and percentage of organic contents. Experimental results of physico-chemical property tests show that Shihwa Lake sediments are relatively large in average grain size(74㎛), contain very small organic material(6%), and are dominantly composed of Quarts, which has relatively low cohesion. Thus, Shihwa Lake sediments might be specified as those whose settling properties are more influenced by gravity than cohesion. It is concluded that the magnitude of settling velocities of muddy sediments can be quite different, regionally, and it implies that field or laboratory experiments for settling velocity measurement should be preceded over the numerical modeling of muddy sediment transport, in order to obtain the reliable prediction results for a given specific site.

Distribution of natural and anthropogenic radionuclides in northwest Mediterranean coastal sediments

Lee, Sang-Han,Povinec, Pavel P.,Chisholm, John R.M.,Levy, Isabelle,Miquel, Juan-Carlos,Oh, Jung-Suk Elsevier 2017 JOURNAL OF ENVIRONMENTAL RADIOACTIVITY Vol.172 No.-

<P><B>Abstract</B></P> <P>The distribution of radionuclides in NW Mediterranean coastal sediments, and the processes controlling their abundance were investigated in three cores taken near the island of Porquerolles and one offshore Monaco. The sediments collected near Porquerolles were strongly anoxic due to diagenetic processes involved in the decomposition of organic matter, whereas they transitioned from oxic to anoxic at a depth of 4 cm beneath the seawater interface at Monaco. Organic carbon (OC) was more abundant in sediments at Porquerolles (by about a factor of 3–5) than at Monaco and elsewhere in the coastal NW Mediterranean. Sediment cores collected NE of Porquerolles also possessed elevated uranium concentrations that correlated with high OC content and strong reducing conditions. The <SUP>239,240</SUP>Pu and <SUP>241</SUP>Am activities in surficial sediments ranged from 1 to 5.7 Bq kg<SUP>−1</SUP> and 0.3 to 1 Bq kg<SUP>−1</SUP>, respectively, while the <SUP>137</SUP>Cs activity ranged from 0.3 to 6.2 Bq kg<SUP>−1</SUP>. The mean activity ratios of <SUP>241</SUP>Am/<SUP>239,240</SUP>Pu and <SUP>238</SUP>Pu/<SUP>239,240</SUP>Pu in Porquerolles and Monaco sediments were similar to the global fallout ratios. Sediment inventories of global fallout <SUP>239,240</SUP>Pu (430–800 Bq m<SUP>−2</SUP>) and <SUP>241</SUP>Am (150–285 Bq m<SUP>−2</SUP>) were by about a factor of 5–10 higher at Porquerolles, whereas the inventory of <SUP>137</SUP>Cs (430–1000 Bq m<SUP>−2</SUP>) was substantially lower at the investigated stations than have been reported elsewhere at similar latitudes. Specific local conditions characterised by high OC sediment loads due to the growth and mortality of <I>Posidonia oceanica</I> have been responsible for deposition of large amounts of seagrass tissues at the NE corner of Porquerolles, which have had a profound effect on the distribution of radionuclides in the sediments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Radionuclides in coastal sediments of NW Mediterranean were investigated. </LI> <LI> <SUP>241</SUP>Am/<SUP>239,240</SUP>Pu and <SUP>238</SUP>Pu/<SUP>239,240</SUP>Pu ratios consistent with global fallout ratios. </LI> <LI> <SUP>137</SUP>Cs mostly dissolved, but <SUP>239,240</SUP>Pu and <SUP>241</SUP>Am are particle reactive elements. </LI> <LI> Inventories of <SUP>239,240</SUP>Pu (430–800 Bq m<SUP>−2</SUP>) and <SUP>241</SUP>Am (150–285 Bq m<SUP>−2</SUP>) are high. </LI> <LI> Inventories of <SUP>137</SUP>Cs are significantly lower at all stations investigated. </LI> </UL> </P>

Decision-making for the Sustainable Beneficial Use of Marine Sediments using Ex-situ Remediation Technologies in Colombia

Wendy Tatiana Gonzalez Cano,Kyoungrean Kim 한국퇴적환경준설학회(구 한국환경준설학회) 2022 한국환경준설학회 학술대회논문집 Vol.2022 No.11

Marine sediments are one of important natural resources for humans. By applying various remediation technologies, marine sediments (naturally or contaminated including dredged materials) could be transformed into commercially useful products. However, selecting appropriate technologies may still be challenging for decision-makers. This research aims (1) to develop a comprehensive environmental assessment criterion to evaluate and identify promising ex-situ technologies for marine sediments in Colombia and (2) propose management frameworks to obtain sustainable beneficial uses from treated sediments. The achieved results identified solidification/stabilization as promising technologies to be adopted in Colombia based on their cost-benefit, high efficiency and environmental feasibility according to several evaluation criteria. Optimal conditions for successful sediment treatment were also identified. Sustainable beneficial use of marine sediments may provide environmental and economic benefits from the point of view of new circular economies. Best-suited technologies can be chosen based on site and sediment characterization without neglecting essential aspects such as cost-effectiveness, treatment time, and removal efficiency, which were considered in this research. The various environmental assessment tools developed may aid decision-makers in selecting optimal technologies and achieving the sustainability of marine sediments by optimizing their beneficial uses. Additional issues including qualities of the Colombian Caribbean marine sediments will be presented during the 2022 KEDS conference. More innovative and practical environmental risk assessments tools are still needed to evaluate the feasibility of various remediation technologies.

한국 서해 강화 갯벌의 퇴적물 특성

우한준,박장준,이연규,제종길,최재웅 한국습지학회 2004 한국습지학회지 Vol.6 No.1

강화 남단 갯벌은 우리나라 서해안의 가장 규모가 큰 갯벌 중의 하나이다. 조석은 전형적인 반일주조로 최대조차가 약 10m 이다. 강화 남단 갯벌은 한강 수계로부터 많은 양의 퇴적물이 유입된다. 연구지역에서 2003년 8월에 83개 정점에서 표층퇴적물을 채취하여 분석하였다. 표층퇴적물은 5개의 퇴적상으로 구성 되어 있었다. 일반적으로 모래 펄 퇴적물은 강화 남단 갯벌에서 우세하였고, 반면에 모래 퇴적물은 강화도 서부의 수로와 조하대에서 우세하였다. 이 지역의 1997년 8월 퇴적상과 비교하여 모래 펄 퇴적물은 갯벌의 동쪽으로 확장 되었다. 강화도 남단 갯벌에서 채취한 3점의 주상 시료에 대한 퇴적학적 분석 결과, 사층리 모래층, 실트-점토 호층 엽리 실트, 생물교란 실트등 세 개의 퇴적상이 인지되었다. 이들 퇴적상의 분포는 조수로 인근 지역이 전반적으로 퇴적률이 높으며, 특히 동검도 동쪽 갯벌에서 최근 급격한 퇴적 작용이 진행되고 있음을 지시하고 있다. 수리학적 관측을 위하여 2003년 6월에 염하수로의 초지대교 부근(K1)과 동검도 남부 수로(K2)에서 12시간 30분 동안 정선 관측을 실시하였다. 잔여유속 계산 결과 이 지역은 썰물이 강하게 나타났다. 각 수층의 부유물질 양에 의하여 계산된 순 부유퇴적물 이동양은 한 조석 주기 동안 염하수로에서는 외해로 309,217.9kg/m가 유출 되며, 동검도 남부 수로에서는 외해로 128,123.1kg/m가 유출 되는 것으로 나타났다. 동검도 남부 수로에 비하여 염하수로의 순 부유퇴적물 이동양이 높은 것은 갯벌의 동부에 한강에서 유입된 많은 부유물질이 퇴적된다는 것을 나타낸다. The southern tidal flat of Kanghwa Island is one of the biggest flats on the west coast of Korea. Tide is typically a semidiurnal with maximum range of about 10m. The tidal flat receives large amount of sediments from Han River system. Surface sediments for sedimentary analyses were sampled at 83 stations in the study area in August 2003. The surface sediments consisted of five sedimentary facies. Generally, sandy mud sediments dominated in the southern tidal flat of Kanghwa Island, whereas sand sediments dominated in channel and subtidal zones of the western part of Kanghwa Island. The area of sandy mud sediment extended to eastward tidal flat compared to sedimentary facies in August 1997. Sedimentary facies analysis of three core sediments from the tidal flat to the south of the Kangwha Island revealed three sedimentary facies: trough-cross-bedded sand, laminated silt, and bioturbated silt. Distribution of the facies in the cores suggested that sedimentation rates has been generally high in the margin of main tidal channel, especially in the east of the Donggeum Island. Twelve-and-half-hour anchoring survey was carried out for measurements of hydrodynamic parameters at Yeomha channel near Choji Bridge(K1) and channel near Donggeum Island(K2) in June 2003. Residual flows indicated strong ebb-dominated tidal currents. Depth-integrated net suspended sediment loads for one tidal cycle were seaward movement with 309,217.9kg/m and 128,123.1kg/m at station K1 and K2, respectively. The higher value of net suspended sediment loads at station K1 suggested that lots of suspended sediments from Han River deposited in the eastern part of tidal flat.