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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean earth science society
Journal Basic Information
Journal DOI :
The Korean Earth Science Society
Editor in Chief :
Volume & Issues
Volume 22, Issue 6 - Dec 2001
Volume 22, Issue 5 - Oct 2001
Volume 22, Issue 4 - Aug 2001
Volume 22, Issue 3 - Jun 2001
Volume 22, Issue 2 - Apr 2001
Volume 22, Issue 1 - Feb 2001
Selecting the target year
Geochemistry of Orthogneisses in the Seungju-Suncheon Area, Korea
Ahn, Kun-Sang ; Oh, Chang-Whan ; Park, Bae-Young ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 163~178
Granite gneiss, pophyroblastic gneiss and leucocratic gneiss are widely distributed in the Seungju-Suncheon area, the southwestern part of the Sobacksan Massif, Korea. These orthogneisses show intrusive relationships in outcrops of the study area. This study focuses on the geochemical properties and the tectonic environments for the original rocks of these orthogneisses. The pophyroblastic gneiss is plotted in diorite and granodiorite domain, and granite gneiss and leucocratic gneiss are plotted in both of granodiorite and granite domains on lUGS silica-alkali diagram. Geochemical properies of major elements suggest that these rocks are sub-alkali rock series, and were formed from S-type magma which generated in syn-collision tectonic environment. Discrimination diagrams using HFS elements suggest that original rocks of the three orthogneisses were granitoid of calc-alkali rock series, and were formed in syn-collision environment.
A Study on the Soft Reclaimed Lands Composed of Shallow Ocean Sediments in Keum River Estuary: Two Dimensional S Wave Velocity and Resolution Obtained by Inverting Surface Waves
Jung, Hee-ok ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 179~185
Borehole tests are commonly used as a tool to obtain the physical properties of soils and rocks. The results of borehole tests are, however, discontinuous. Interpolation methods are applied to interpret the data gap between the borehole test points. The interpolation is valid only if the horizontal variations of the ground between the test points are small enough to ignore. A surface wave inversion method was used to study the S wave velocity of the very soft soil to provide the continuous 2 dimensional S wave velocity structure. The resolution of the S wave velocity structure was used to interpret the inversion results.
Development of Meso-scale Short Range NWP System for the Cheju Regional Meteorological Office, Korea
Kim, Yong-Sang ; Choi, Jun-Tae ; Lee, Yong-Hee ; Oh, Jai-Ho ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 186~194
The operational meso-scale short range NWP system was developed for Cheju Regional Meteorological Office located at Cheju island, Korea. The Central Meteorological Service Center, KMA has reported the information on numerical weather prediction every 12 hours. But this information is not enough to determine the detail forecast for the regional meteorological office because the terrain of the Korean peninsula is very complex and the resolution of the numerical model provided by KMA headquarter is too coarse to resolve the local severe weather system such as heavy rainfall. LAPS and MM5 models were chosen for three-dimentional data assimilation and numerical weather prediction tools respectively. LAPS was designed to provide the initial data to all regional numerical prediction models including MM5. Synoptic observational data from GTS, satellite brightness temperature data from GMS-5 and the composite reflectivity data from 5 radar sites were used in the LAPS data assimilation for producing the initial data. MM5 was performed on PC-cluster based on 16 pentium CPUs which was one of the cheapest distributed parallel computer in these days. We named this system as Halla Short Range Prediction System (HSRPS). HSRPS was verified by heavy rainfall case in July 9, 1999, it showed that HSRPS well resolved local severe weather which was not simulated by 30 km MM5/KMA. Especially, the structure of rainfall amount was very close to the corresponding observation. HSRPS will be operating every 6 hours in the Cheju Regional Meteorological Office from April 2000.
Impact of Seawater Inflow by the Operation of Sluice Gates on the D.O and pH in the Lake Shihwa, Korea
Choi, Jung-Hoon ; Kim, Mi-Ock ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 195~207
The variations of D.O and pH due to the inflow of seawater by sluice gates operation were observed in the Lake Shihwa, Korea. The distributions of D.O and pH were investigated at 11 stations during Feburary 1997 to July 1998. The concentration of D.O before gate operation was 10 mg/l or more all over the watershed, yet 5 mg/l or less in the water layers of 11 m or below from March to June 1997. Anoxic layer appeared in June 1997 and expanded during rainy season. The anoxic layer in the lake depleted the oxygen in seawater as seawater was inflowed. It may be interpreted that the phenomenon comes from the contact of seawater to lower fresh water. The contact of seawater in pH 7.8 to 8.2 to lower water less than pH 7.4 enhanced to oxidize. After January 1998, D.O of the lake increased over 10 mg/l and the stratification was weakened. As a result, it may be concluded that the best way to improve the water qualities is to increase the amount of seawater inflow and outflow so as not to be generated pycnocline in summer.
Mineralogy and Geochemistry of Iron Hydroxides in the Stream of Abandoned Gold Mine in Kwangyang, Korea
Park, Cheon-Young ; Jeoung, Yeon-Joong ; Kim, Seoung-Ku ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 208~222
Geochemical investigations on suspended amorphous iron oxide material from the Kwangyang gold mine and its surrounding area, Cheonnam, Korea have been carried out. The sediments samples were collected from 11 location along Kwangyang mine area and were air dried and sieved to -80 mesh. These samples consist mainly of iron, silicon and alumina. The Fe
contents ranges from 17.9 wt.% to 72.3 wt.%. The content of Fe
increase with decreasing Si, Al, Mg, Na, K, Mn, and Ti, whereas the contents of Te, Au, Ga, Bi, Cd, Hg, Sb, and Se increase in the amorphous stream sediments. Amorphous stream sediments have been severely enriched for As (up to 54.9 ppm), Bi (up to 3.77 ppm), Cd (up to 3.65 ppm), Hg (up to 64 ppm), Sb (up to 10.1 ppm), Cu (up to 37.1 ppm), Mo (up to 8.86 ppm), Pb (up to 9.45 ppm) and Zn (up to 29.7 ppm). At the upstream site, the Au content (up to 4.4 ppm) in the amorphous stream sediments are relatively high but those contents decrease with distance of mine location. The content of Ag (up to 0.24 ppm) were low in upstream site but those contents increase significantly in the downstream sites. The X-ray diffraction patterns of the samples have virtually no sharp and discrete peaks, indicating that some samples are amorphous or poorly-ordered. The quartz, goethite, kaolinite and illite were associated in amorphous stream sediments. The infrared spectra for amorphous stream sediments show major absorption bands due to OH stretching, adsorbed molecular water, sulfate and Fe-O stretching, respectively.
Distribution Characteristics of Atmospheric Mercury from Two Monitoring Stations: Inside and Outside of Seoul Metropolitan City, Korea
Kim, Ki-Hyun ; Kim, Min-Young ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 223~236
The concentration of gaseous mercury (Hg) was measured at hourly intervals along with relevant environmental parameters from two monitoring stations (Hannam and Kwachun) in Seoul metropolitan city during September 1999 to July 2000. Irrespective of the environmental and areal differences in the two locations, the concentrations of observed Hg levels were remarkably compatible each other. The results showed that the mean Hg level in Hannam was measured to be 5.34
(N = 2576), while that of Kwachun was 5.25
(N = 1992). Using these measurement data, we inspected Hg distribution and behavior at various time scale. When the data were analyzed at 24 hr scale, the distribution patterns for the two areas were distinguished by enrichment in either night(Hannam) or day (Kwachun). The patterns for seasonal distributions were also opposing each other such as the occurrences of peak during winter (Hannam) or summer (Kwachun). In order to analyze the factors affecting Hg distributions between two sites over different time scale, we conducted both correlation and factor analysis on both all data sets and on seasonally divided data groups. Whereas Hg exhibits strong correlations with such parameters as PM (particulate matter), SO
, and NO
, its relationship with meteorological parameters was not significant enough in many cases. The results of factor analysis also indicated that the Hg levels are tightly associated with most pollutants, explaining the largest portions of statistical variance. According to our study, we conclude that patterns of Hg distributions can exhibit variable patterns depending on local source processes which we expect to be diverse among different areas.
Changes of Total Gaseous Mercury Concentration Levels and the Associated Environmental Conditions in Seoul, Korea
Kim, Min-Young ; Kim, Ki-Hyun ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 237~247
The concentrations of gaseous mercury (Hg) determined between two different time periods of the late 1980s and the late 1990s were compared to account for the effects of changes between source/sink relationships of atmospheric Hg in an urban area. The Hg concentration levels were different remarkably between the two time periods due possibly to changes in source/sink relationships. The results showed that the Hg levels in the former period were measured to be 14.4
(N = 2714), whereas those of the latter period were characterized by approximately three-fold decreased values of 5.34
(N=2576). Using two independent measurement data sets, we examined the patterns of Hg distribution at different time scales. When analyzed over 24 hour scale, these data sets exhibited two distinctive distribution patterns. The former period showed enhanced concentration levels during daytime, while the latter period showed relative depletion during daytime. The patterns of the two data sets were also examined over seasonal scale. The results of two different time periods consistently showed the occurrences of maximum seasonal values during winter. The former period was characterized by seasonal patterns of fuel consumption with excessive Hg levels during winter. Conversely, no distinctive trend was apparent for the latter period with slight changes in concentration levels across seasons. In order to analyze the factors affecting Hg distributions between two different periods, we conducted both correlation and factor analysis on both all data sets and on seasonally divided data groups. The results of these analyses consistently indicate that the Hg concentration levels for two different time periods are regulated by distinctive source processes that are characteristic of each period.
Characteristics and Tasks of the 7th Science Curriculum
Lee, Myeong-Je ;
Journal of the Korean earth science society, volume 22, issue 3, 2001, Pages 248~257
The 7th science curriculum has the characteristics of humanistic philosophy of education. The humanistic curriculum emphasized learner-centered education, which claims to stand for learners' experiences. This study searched for the significances of the 7th science curriculum, and discussed its tasks and perspectives based on the backgrounds, characteristics, and objectives mentioned in the history of reforming science curriculum. The 7th science curriculum emphasizes learners' experiences and everyday life materials are favored in teaching-learning activities. For the desirable effects related to this commitment, pre-service and in-service training programs are required about the social elements in the nature of science, and everyday life contexts should be examined in views of educational and cognitive perspectives, so the contextual differences between science and everyday life should be clarified.