• 한국지하수토양환경학회:학술대회논문집
• /
• 한국지하수토양환경학회 2003년도 추계학술발표회
• /
• pp.107-111
• /
• 2003

Estuary of Nakdong river area is composed of unconsolidated sediments including clays that are deposited varying from 40 to 70m thick. The purpose of research is the knowledge of the correlation between engineering properties and mineralogy of clay sediments. The correlation analysis carry out multiple regression that have independent variables (Engineering properties) and dependent variables (mineralogy, geochemistry). Engineering properties of clay are correlated with the mineral compositions and geochemical characteristics. The result of the analysis is Wn=-0.6 Feldspar ＋ 1.1 pH ＋ 0.01 TDS ＋ 27.5, Ip=0.36 Clay ＋ 1.44 Vermiculite ＋ 0.94 clay mineral-22.88, P$_{L}$=0.005 TDS - 0.31 Feldspar ＋ 22.43, e$_{o}$=0.02 Vermiculite - 0.01 Quartz ＋ TDS ＋ 0.93, E$_{50}$=1.94 Vermiculite-0.96 Kaolinite -0.53 silt ＋ 49.64, SR=-0.25 Kaolinite ＋ 1.5 pH - 2.3 Conductivity, CC = 0.03 pH ＋ TDS - 0.2, LL = 0.5 Clay ＋ 1.3 Vermiculite ＋ 5.5 Conductivity ＋ 0.8 Caly mineral-20.4.4.4.4

• 지구물리와물리탐사
• /
• 제2권4호
• /
• pp.202-208
• /
• 1999

Chirp sonar 시스템을 이용하여 획득한 광역주파수 음향반사자료의 감쇠특성을 나타내는 음향학적 분류변수를 고안하였다. 분류변수는 퇴적물 물성에 따른 분산효과에 의한 감쇠특성을 나타내며, 음향반사신호의 푸리에 변환을 이용한 unwrapped 위상의 미분치로부터 구하였다. 그리고 각기 다른 퇴적상을 나타내는 지점에서 획득된 음향반사신호의 지질음향모델링을 통하여 퇴적물 물성에 따른 감쇠특성을 평가하였다. 그 결과, 분류변수는 입자크기와 성분에 따른 퇴적물 형태와 해저면 굳기에 따라 값의 차이를 보였으며, 이는 음향자료로부터 직접 해저면을 분류하는데 효과적으로 사용할 수 있다.

• 한국수처리학회지
• /
• 제26권6호
• /
• pp.43-51
• /
• 2018

In order to systematically and scientifically manage the organic and heavy metals against sediment at Daecheon Port, this study conducted particle composition, organic materials and heavy metals irradiation studies of sediments. Analysis of the grain size composition of sediments in the target study area showed the distribution characteristics of the mix of sand, silt and clay. That is, Station C (Stn. C) showed superior by fine-grained sediment, Station A and B (Stn. A and B) showed superior by coarse-grained sediment. The organic matter(COD, TOC, and IL) of Stn. C was appeared to be heavily polluted more than Stn. A and B. These data for the spatial properties in sediment showed that organic matter was related positively to the sediment silt-clay content. Also, in the case of heavy metals contamination in surface sediments, Stn. C was higher than Stn. A and B. Particularly, at the Stn. C, high organic matter concentration and C/N ratio value( >10) indicated that the sediment was composed highly of land-derived organic matter. From these results, it considered that the correlation analysis among to silt-clay, organic matter and heavy metal was found to have a good interrelationship.

• 광물과 암석
• /
• 제34권1호
• /
• pp.15-29
• /
• 2021

북극해는 기후 변화에 따라 북극의 해빙과 빙상의 분포가 달라지며 쇄설성 퇴적물 내 광물의 특성이 변화한다. 따라서 해빙이나 빙산에 의해 운송된 해양 퇴적물을 연구하는 것은 지구 기후 변화를 이해하는 데에 매우 중요하다. 본 연구에서는 척치해저고원의 아라온 마운드에서 채취한 4개의 중력코어와 아라온 마운드 사이 사면에서 채취한 1개의 중력코어를 사용하여, 벌크광물조성, 점토광물조성, 빙운쇄설물 연구를 통해 쇄설성 퇴적물의 기원지를 알아보고 이를 바탕으로 서북극해의 고환경 변화를 재구성하였다. 코어 퇴적물들은 갈색, 회색, 녹회색을 띠며 서북극해에서 나타나는 간빙기/빙기 순환에 따른 퇴적물 색의 특성을 잘 나타내고 있다. 척치해저고원에서 획득한 코어 퇴적물을 광물 특성과 주변에서 수행된 기존 연구와 비교하여 총 3개의 유닛으로 구분하였다. 최후빙기극대기에 퇴적된 유닛 3 퇴적물은 동시베리아해로 유입되는 콜리마 강과 인디기르카 강 퇴적물들이 동시베리아해 대륙붕에 퇴적된 후, 해빙이나 해류에 의해 유입된 것으로 보인다. 퇴빙기에 해당하는 유닛 2 퇴적물은 동시베리아해로 유입되는 콜리마 강, 인디기르카 강, 보퍼트해로 유입되는 맥켄지강과 캐나다 군도로부터 함께 공급된 것으로 보이며, 로렌타이드 빙상의 융해에 의하여 다량의 빙운쇄설물들이 유입되었다. 간빙기 퇴적물인 유닛 1의 경우, 세립질 퇴적물들은 캐나다 북부와 동시베리아해로부터 해빙과 해류에 의해 공급되었으며, 조립질 퇴적물들은 캐나다 군도로부터 해빙에 의해 유입된 것으로 여겨진다.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2002년도 학술발표회 논문집(II)
• /
• pp.1111-1116
• /
• 2002

• 한국수산과학회지
• /
• 제48권5호
• /
• pp.789-797
• /
• 2015

The concentrations of trace metals (As, Cd, Cr, Cu, Fe, Hg, Mn, Pb, and Zn) were determined in 49 surface sediment samples collected in Yeoja and Gangjin Bays on the south coast of Korea, which contain many shellfish farms, in order to assess the contamination level and to understand the spatial distribution of trace metals. The average metal concentrations in the surface sediments of both bays decreased in the order Fe > Mn > Zn > Cr > Pb > Cu > As > Cd > Hg. There were no differences in metal concentrations between shellfish farms and reference sites. The metal concentrations were significantly higher in Gangjin Bay than in Yeoja Bay. Notably, the Cu, Cd, and Hg concentrations were nearly twice as high in Gangjin Bay as in Yeoja Bay. A multivariate analysis showed a strong correlation among Fe, Mn, Zn, Pb, and Cr in the sediments of both bays, implying that the metal concentrations in the sediments in the study area were mainly dependent on natural processes, such as crustal components and diagenesis. Based on the geoaccumulation index and marine sediment quality guidelines (SQGs), the surface sediments in Yeoja and Gangjin Bays are not polluted by trace metals.

• 한국습지학회지
• /
• 제7권2호
• /
• pp.53-67
• /
• 2005

천수만은 전형적인 반 폐쇄형만으로 수로, 사퇴, 작은 섬 그리고 갯벌 등 다양한 환경들이 있다. 1983년에서 1985년 사이에 건설된 서산 A와 B 방조제는 천수만 북부의 퇴적환경을 지속적으로 변화시켰을 것으로 보인다. 황도 갯벌과 주변 해역의 퇴적환경을 파악하기 위하여 2003년 6월과 10월에 표층과 주상 퇴적물을 채취하였다. 표층 퇴적물은 5개의 퇴적상으로 구성되어 있었다. 일반적으로 10월의 표층퇴적물은 6월과 비교하여 갯벌은 조립해 졌으나 주변 해역은 거의 변화가 없었다. 3개의 주상퇴적물의 퇴적상은 황도 주변 갯벌은 파랑과 조류 에너지가 상대적으로 높고, 조수로 근처의 갯벌은 에너지가 상대적으로 낮은 것으로 나타났다. 황도 갯벌의 11개월 동안 단기 퇴적률은 중앙지역은 퇴적 되었으나, 갯벌의 동쪽 측면과 서쪽 측면은 침식된 것으로 나타났다. 이는 방조제에 의하여 조류 형태와 퇴적물 순환이 변화되었기 때문으로 보인다.

• 한국환경과학회지
• /
• 제14권1호
• /
• pp.23-32
• /
• 2005

Surface sediments (0$\~$4 cm) were sampled at 40 stations from Ulsan Bay and its adjacent areas of Korea, to evaluate the contamination by sewage-derived organic matters using fecal sterols. Some sterols were quantified by gas chromatography coupled to mass spectrometry (GC/MS). Total concentrations of eight sterols (co­prostanol, cholesterol, cholestanol, epicholestanol, epicoprostanol, ${\beta}-sitosterol,$ brassicasterol, and stigmasterol) in the sediments from Ulsan Bay and its vicinity varied from 929 to 23,444 ng/g dry weight. The most predom­inant sterols were cholesterol and coprostanol, accounting for $33\~72{\%}$ of total sterols. The concentration of coprostanol known as the indicator of human feces ranged from 141 to 8,257 ng/g dry weight. In particular, the coprostanol concentrations in the sediments from Jansaengpo Harbor and Taehwa River exceeded the value of 1,000 ng/g dry weight, suggesting that these areas could be considered as the hot-spot zones by municipal sewage contamination. Some molecular indices and multivariate data analysis were used to assess the origin of these sterols in the sediments. Results showed that the major routes of sewage contamination in Ulsan Bay and its vicinity were the input through Jansaengpo Harbor and Taehwa River.

• 한국환경과학회지
• /
• 제14권5호
• /
• pp.481-490
• /
• 2005

Surface sediments and seawater were sampled at Masan and Haengam Bays of Korea, to evaluate contamination by sewage-derived organic matter using fecal sterols, Six stream-water samples into Masan and Haengam Bays were also sampled. Total concentrations of eight sterols (coprostanol, epichloestanol, epicoprostanol, cholesterol, cholestanol, brassicasterol, stigmasterol and $\beta-sitosterol$) were in the range of $1,274\~4,768{\mu}g/g$ dry weight in suspended particulate from the stream-water, $292\~2,244{\mu}g/g$ dry weight in suspended particulate from the seawater and $4.5\~27.2{\mu}g/g$ dry weight in the sediments. Although sterol compositions in sediments, seawater and stream-water were different, cholesterol was the predominant sterol in all samples. The proportion and concentration of coprostanol, a sewage tracer, in stream-water was much higher than those in sediment and seawater. The sterol levels including coprostanol in the sediments and seawater were higher at inner basin than at the outer bay. Some molecular indices and multivariate statistical analysis were used to assess the origin of these sterols and sewage contamination in the study area. The sterol composition patterns in stream-water were mainly associated with contamination by sewage-derived organic matters and those of seawater were associated with the activities of marine-originated organisms. Sterol levels in the sediments were both from the sewage input through stream-water and the marine- originated organisms. This survey suggests that the main source/route of sewage-derived organic matters in Masan Bay is the input of stream-water into the bay.

• Geomechanics and Engineering
• /
• 제15권4호
• /
• pp.1005-1016
• /
• 2018

This paper presents an investigation on the properties of two types of cement kiln dust (CKD)-stabilized dredged sediments, silt and clay with a comparison to hydrated lime stabilization. Unconfined compressive strength (UCS) and California bearing ratio (CBR) tests were conducted to examine the optimal stabilizer content and classify the type of highway material. A strength development model of treated dredged sediments was performed. The influences of various stabilizer types and sediment types on UCS were interpreted with the aid of microstructural observations, including X-ray diffraction and scanning electron microscopy analysis. The results of the tests revealed that 6% of lime by dry weight can be suggested as optimal content for the improvement of clay and silt as selected materials. For CKD-stabilized sediment as soil cement subbase material, the use of 8% CKD was suggested as optimal content for clay, whereas 6% CKD was recommended for silt; the overall CBR value agreed with the UCS test. The reaction products calcium silicate hydrate and ettringite are the controlling mechanisms for the mechanical performance of CKD-stabilized sediments, whereas calcium aluminate hydrate is the control for lime-stabilized sediments. These results will contribute to the use of CKD as a sustainable and novel stabilizer for lime in highway material applications.