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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Economic and Environmental Geology
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Journal DOI :
The Korean Society of Economic and Environmental Geology
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Volume & Issues
Volume 41, Issue 6 - Dec 2008
Volume 41, Issue 5 - Oct 2008
Volume 41, Issue 4 - Aug 2008
Volume 41, Issue 3 - Jun 2008
Volume 41, Issue 2 - Apr 2008
Volume 41, Issue 1 - Feb 2008
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Assessment on the Mechanical-Chemical Stabilities of Coal Ash Blocks in Sea Water
Kim, Pil-Geun ; Sung, Kyu-Youl ; Park, Maeng-Eon ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 383~392
This study aims to evaluate the mechanical-chemical stability of used coal ash blocks, for improving fishing grounds. The surface of weathered ash blocks in seawater showed a decrease in the Ca and an increase in the Mg contents, compared to that of fresh blocks. This result reflects the substitution of Ca by Mg in seawater. The compressive strengths of ash blocks submerged into seawater during 12 months ranged from 235.23 to
; this is higher than the standard strength of wave-absorbing blocks(
that are used for harbor construction. In addition, the compressive strength of ash blocks tends to increase with increasing installation time in seawater. The result of leaching experiments on coal ash blocks by Korean Standard Leaching Test(KSLT) method showed that leached concentrations of most metals except Cr(that leached up to 50 ppb, approaching standard concentration) do not exceed the seawater quality standards. A long-term(112 days) heavy metal leaching test to analyze seawater without mixing-dilution also showed that the concentrations of leached heavy metals, except for Cu, under anaerobic conditions do not exceed the seawater quality standards. Accordingly, the use of coal ash blocks in marine environments appears to be safe from chemical and mechanical factors that decrease the efficiency of concrete. Also, leaching concentration of Cu seems to be stable by decrease of leaching concentration due to dilution of seawater.
Variation in Nitrate Contamination of Shallow Groundwater in a Farmland in Gyeonggi-do, Korea
Lee, Eun-Jae ; Woo, Nam-Chil ; Lee, Byung-Sun ; Kim, Yang-Bin ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 393~403
Hydrogeochemistry of groundwater was studied in order to identify the influence of cow manure, distributed to a farmland as organic fertilizer, on nitrate concentrations in shallow groundwater and its spatio-temporal variations. From monitoring wells, water levels were measured using automatic data loggers, and water samples collected and analyzed in Feb., April, June and Oct. 2007. The average electric conductivity and concentration of nitrate in the groundwater show the highest levels in April and decline in subsequent sampling times. Decreases in dissolved oxygen(DO) and nitrate concentrations from April to Oct. and corresponding increases in
concentrations indicate denitrification processes by microorganisms. Spatial variation of nitrate concentration appeared to be affected by the redox conditions of groundwater controlled by geochemical reactions of Mn, Fe and DOC contents.
The Behavior of Dissolved and Particulate Phases of Trace Elements within the Watershed of Juam Reservoir
Lee, Pyeong-Koo ; Chi, Se-Jung ; Youm, Seung-Jun ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 405~425
In order to investigate the amounts of trace elements flowing into reservoir, and to elucidate the relationship between trace element mobility and fraction size, the stream water and sediment samples were collected from thirty-two sites of the 3rd or 4th order stream within watershed surrounding the Juam reservoir. Chemical analyses of trace elements (As, Cd, Cr, Cu, Ni, Pb and Zn) for all samples were completed, and additionally cationi and anion for stream water samples. Considering the distribution of rocks and contamination sources in watershed, the eight stream sediments were selected from typical sites representing study areas, and we determined the concentrations of trace elements according to size fractions (
). The correlation relationships between concentrations and size fractions of stream sediments were important to identify the hydro-geochemical behavior of trace elements that flow into Juam reservoir. Stream waters showed four water types (Ca-Mg-
) depending on pollution sources such as coal mine, metal mine, farm-land and dwellings. Concentrations of trace elements increased clearly with the decrease in size fractions of stream sediments. Concentrations of Cu, Pb and Zn increased dramatically in silt size (<
) fraction, while As had high concentrations in sand size (
) fraction in downstream sediments of metal mines. These indicate that Cu, Zn, and Pb moved into Juam reservoir easily in the adsorbed form on silt size grain in sediments, and As was transported as As-bearing mineral facies, resulting in its less chance to reach into Juam reservoir.
Estimation of Groundwater Recharge in Junggwae-Boeun Area in Ulsan City Using the Water Balance and Hydrogeological Analyses
An, Jeong-Hoon ; Hamm, Se-Yeong ; Lee, Jeong-Hwan ; Kim, Nam-Hoon ; Yang, Dae-Bok ; Hwang, Jee-Gwang ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 427~442
Estimation of groundwater recharge is one of the most critical issues in sustainable management of groundwater resources. This study estimated groundwater recharge in the Junggwae-Boeun area in Ulsan City, by using the water balance and hydrogeological characteristics of geology and soil. Evapotranspiration was computed by using the Thornthwaite method, and direct runoff was determined by using the SCS-CN technique. Groundwater recharge was obtained as 266 mm/a (20.6% of the average annual precipitation, 1296 mm/a), with 779 mm/a (60.1%) of evapotranspiration and 119 mm/a (9.2%) of direct runoff. Precipitation and groundwater recharge was highly correlated, comparing with the relationships between precipitation and evapotranspiration, and between precipitation and direct runoff. This fact indicates that groundwater recharge responds more sensitively to precipitation than evapotranspiration and direct runoff do.
Evaluation of Potential Amount of Groundwater Development in Chungju Basin by Using Watershed Hydrologic Model and Frequency Analysis
Lee, Jeong-Eun ; Kim, Nam-Won ; Chung, Il-Moon ; Lee, Jeong-Woo ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 443~451
Memon(1995) pointed out that the groundwater recharge from the precipitation is affected by various factors such as the occurrence, intensity, duration, and seasonal distribution of rainfall; air temperature, humidity, and wind velocity; the character and thickness of the soil layer above the water table; vegetated cover, soil moisture content, depth to the water table, topography; and land use. To reflect above factors, groundwater recharge in Chungju basin is computed by using the SWAT-K which is a longterm continuous watershed hydrologic model. Frequency analysis is adopted to evaluate the existing values of potential amount of groundwater development which is made by the 10 year drought frequency rainfall multiplied by recharge coefficient. In this work, the recharge rates of 10 year drought frequency in subbains were computed and compared with the existing values of potential amount of groundwater development. This process could point out the problems of existing precesses used for computing potential amount of groundwater development.
A Study on the Correlation between Coal Mining Subsidence and Underground Goaf
Choi, Jong-Kuk ; Kim, Ki-Dong ; Song, Kyo-Young ; Jo, Min-Jeong ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 453~464
This study is to examine a relation between coal mining subsidence occurrence at abandoned underground coal mines and underground goaf with respect to surface geology, subsurface structure, depth and thickness of coal beds and the distribution of drifts. A study is carried out at the site where susceptibility of coal mining subsidence was proven high in a previous study. In that previous study, the susceptibility of coal mining subsidence was spatially analyzed by GIS using digitized geological maps, investigation reports, digitized mining tunnel maps without consideration of subsurface structure and the multi-level arrangement of drifts. Here we analyze geological characteristics around the goaf and the distribution of coal seam based upon digitized geological maps and investigation reports on the study area. And digitized mining tunnel maps are also used to analyze the depth and multi-level arrangement of drifts. The results show that weakened surface rock strength, relatively shallow depth and large thickness of coal seam below the surface are closely related to the coal mining subsidence occurrence. Complicatedly inter-connected drifts, shallow depth of drifts and surface rock fractures are revealed as additional control factors affecting coal mining subsidence. These factors examined in this study as well as original factors should be taken into account for the quantitative estimation of coal mining subsidence occurrence at abandoned underground coal mine.
WNW Trending Lineament and Criteria of Left-Lateral Displacement Around Haman-Uiryeong, Korea
Ryoo, Chung-Ryul ; Kim, Jong-Sun ; Lee, Han-Yeang ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 465~468
Two half circular structures are developed in the northern and southern blocks which divided by the WNW-trending lineament around Uiryeong-Haman area, southern part of the Gyeongsang basin. By displacing one half circular structure to the other one about 750 m, a perfect circular structure is reconstructed. Thus the WNW-trending lineament is a left-lateral fault displacing the circular structure. The NNW trending ridges are dragged with anticlockwise sense near the WNW-trending fault, which indicates also the existence of a sinistral movement.
Review of the Characteristics of Ai-Karaaul Cu Mineralized Zone in the Eastern Kazakhstan Oblast, Kazakhstan
Lee, Jae-Ho ; Kim, In-Joon ; Kim, Bok-Chul ;
Economic and Environmental Geology, volume 41, issue 4, 2008, Pages 469~473