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2007, Vol.16, No.4

  • 1.

    Content of Mineral Elements, Heavy Metals, Total Coliform and Benzo(a)pyrene of Turfground Planting at Playground Soil in Elementary School of Jeollabuk-do

    Park, Bong-Ju | CHO JAE YOUNG | 2007, 16(4) | pp.241~250 | number of Cited : 6
    Abstract PDF
    A study was carried out on the level of heavy metals, total coliform and benzo(a)pyrene thatmay be introduced through by-product fertilizers or air pollution to turfgrass in naturalturfgrass playground in elementary schools around the western coast and eastern mountainareas in Jeollabuk-do, Korea. The level of heavy metals found in turfgrass was in the order ofCu > Zn > Pb > Cd. The majority of heavy metals was found in the roots. It is presumed that theabsorption of some air pollutants and by-product fertilizers or chemical fertilizers. The level ofbenzo(a)pyrene showed an average of 0.05ng/g with a range between 0.02 to 0.08ng/g in theleaves. In the meantime, none was detected in the stems, while the average for roots was0.02ng/g with a range between 0.01 and 0.03ng/g. The level detected is that found backgroundlevel, however, benzo(a)pyrene can be introduced partly from the unstable combustion of fossilfuel or through vehicle emissions. Total coliform distributed in grass showed an average of12MPN/100ml with a range between 2 and 36MPN/100 ml. The density of total coliformdisplayed no regional predominance. However, in some urban areas, the density was slightlyhigher. The feces of pets or by-product fertilizers may have contributed to the input ofpathogenic micro-organism. Yet the level was found to be negligible.
  • 2.

    Simulation of Flow Change and Level of Groundwater using MODFLOW Due to Large-size Building Construction in Metropolitan Area

    박선환 | Yoon-Young Chang | 임형규 | 2007, 16(4) | pp.251~265 | number of Cited : 0
    Abstract PDF
    In this study, the influence of the construction of a large sized building on the flow and levelof groundwater in a metropolitan area was investigated with simulation model MODFLOW fora selected area located in Gangseo-gu, Seoul, where a large business center was scheduled to bebuilt.It was simulated that the groundwater level in the study area was suddenly lowered by theconstruction of a large building and groundwater in the surrounding area fast flowed intothe study area. And even after the construction finished, the falling down of groundwater levelconsistently continued in some degree.The flow state of groundwater appeared to be the same in both cases where a soil cementwall is applied and where it is not during the construction. But for the case of application of asoil cement wall as the amount of groundwater flowing into the study site became reduced, itwas estimated that the time for underground watershed getting far away from the site was alsoreduced and the influence of a building construction on the surrounding groundwater becamereduced.Thus, it is deemed necessary that recharging the spilled ground water and rainfall into theconstruction area to lessen the abrupt change in flow and level of ground water should beconsidered in design of construction of a large sized building in a metropolitan area.
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  • 4.

    Estimation of Emission and Development of Emission Factor on Greenhouse Gas (CO2) of the Combustion Facilities

    김홍록 | 진병복 | 윤완우 and 4other persons | 2007, 16(4) | pp.277~283 | number of Cited : 3
    Abstract PDF
    Since the Kyoto Protocol became into effect, Korea has been expected to be part of the AnnexI countries performing the duty of GHG reduction in the phase of post-Kyoto. Therefore, it isnecessary to develop emission factors appropriate to Korean circumstances.In order to develop emission factors this study utilized the CleanSYS, which is the real-timemonitoring system for industrial smoke stacks to calculate the emission rate of CO2continuously.In this study, the main focus was on the power generation plants emitting the largest amountof CO2 among the sectors of fossil fuel combustion. Also, an examination on the comparison ofCO2 emission was made among 3 generation plants using the different types of fuels such asbituminous coal and LNG; one for coal and others for LNG. The CO2 concentration of the coalfired plant showed Ave. 13.85 %(10,384 ton/day). The LNG fired plants showed 3.16 %(1,031ton/day) and 3.19 %(1,209 ton/day), respectably.Consequently, by calculating the emission factors using the above results, it was found thatthe bituminous coal fired power plant had the CO2emission factor average of 88,726 kg/TJ, andthe LNG fired power plants had the CO2 average emission factors of 56,971 kg/TJ and 55,012kg/TJ respectably which were similar to the IPCC emission factor.
  • 5.

    Ecological Case Study of Eco-bridges in Korea: State and Problem

    최병진 | Jeong, Jong Chul | KIM JOO PIL and 1other persons | 2007, 16(4) | pp.285~300 | number of Cited : 5
    Abstract PDF
    The purpose of this study was to ascertain the ecological state and problems of eco- bridgeson Korean roads. The study was conducted from March to April 2007 by checking ecologicalfactors and wildlife around the eco-bridges and habitats. 8 representative eco-bridges wereselected by their bridge shape and condition of location. After field survey, we analyzed idealtrails for wildlife using field data, digital topology maps, satellite images, and land use map. Inaddition to trail analysis, we identified the propriety of the eco-bridges through PopulationViability Analysis. Because of unsuitable location and management, we found that most of thebridges are not proper for wildlife dispersal. Moreover, in some habitats, we could expect thatsome local populations might be extinct without appropriate treatments.