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2004, Vol.13, No.4

  • 1.

    A Study on the Integration of Watershed and Stream Models for Impact Assessment of Urban Development on Water Environment

    Kang, Yu-Seon | SeokSoonPark | 2004, 13(4) | pp.153~164 | number of Cited : 3
    Abstract PDF
    An integration study of time-variable small watershed and stream models (USEPA’s SWMMand WASP5) was performed for impact assessment of urbanization on water environment. Thestudy area, the Kyoungan Stream, the tributary of Paldang Lake, was divided into 111 sub-basins, based on the topographic condition, land use, and drainage system. RUNOFF block ofSWMM was applied to estimate runoff flow and quality. EXTRAN block computed daily andhourly flow according to simulated runoff flow, water supply, and drainage data. SWMM wasconnected to WASP5 by transforming output file of SWMM into input file of WASP5. The non-point source loads and flow data of SWMM were imported to WASP5. The stream was dividedinto 45 segments based on the watershed delineation. The study included three water qualityparameters, BOD, TN, and TP. The validate models were used to examine the impact ofurbanization on stream flow and water quality.
  • 2.

    Analysis of problems and improvement of Environmental Impact Assessment in Social-economic Items based on 19 major Large Scale Development projects

    Lee, Sang-Don | 2004, 13(4) | pp.165~185 | number of Cited : 5
    Abstract PDF
    Assessment in Socio-economic items should be used to estimate social influence when policies and projects were introduced. To estimate current situation of socio-economic items 19 Environmental Impact Statement (EIS) of large scale projects were analyzed. The projects were selected based on magnitude of social impact when the projects were implemented. Environmental Impact Statement was categorized into line projects(road construction, railroad construction, stream development, etc), and surface projects(energy development, wetland reclamation, recreation and sport development, and housing and residential development, etc) thus being chosen for 19 projects in each categories. This report was based on the analysis of 7 items in socio-economic environmental items(i.e., population, residents, industry, public facilities, education, transport and historical monument). Most EIS did not follow the regulation suggested by Ministry of Environment, and only current circumstances were briefly described. Indifference of in-depth analysis of socioeconomic environmental items would influence the process of social and environment impact negatively in the midst of construction of National Projects such as Outer Circle Seoul Highways, Saemankeum Reclamation Projects, etc. This abrupt halt of construction was mostly based on a lack of public hearing or public participation. Socio-economic items are also very much lacking in quantitative method and strengthening socio-economic environmental items is needed via checklist or matrix that brings decision-makers better ideas objectively.
  • 3.

    METHANE OXIDIZING CAPACITY  OF LANDFILL COVER SOILS TO REDUCE ATMOSPHERIC METHANE EMISSIONS

    박소영 | 2004, 13(4) | pp.187~196 | number of Cited : 0
    Abstract PDF
    매립지에서 배출되는 메탄가스는 이산화탄소에 이어 두 번째로 많이 배출되는 지구온난화가스이지만 열을 흡수하는 능력에 있어서는 이산화탄소 보다 25에서 35배 정도 더 크기 때문에지구 온난화 현상에 대한 메탄가스의 영향은 중요하다고 할 수 있다. 매립지로부터 배출되는메탄가스는 호기성 상태의 매립지 복토층을 통과 할 때 산화될 수 있으므로 매립지 복토층은메탄가스의 배출을 저감시키는 바이오필터의 역할을 할 수 있다. 본 연구에서는 batch 실험을통하여 매립지 복토층에서의 메탄산화속도에 대한 토양수분과 온도의 영향을 연구하였다. 최대산화속도는 토양수분 15%(w/w), 배양온도 35。C의 환경조건에서 1.03 mmol CH4 g-1soil h-1으로나타났다. 이러한 실험결과를 이용하여 토양수분과 온도를 함수로 하는 회귀모형을 개발하였다.또한 전국에 4 군데 지역을 선발하여 각 지역의 토양수분과 온도 데이타를 수집하고 개발된 모형을 이용하여 각 지역에 위치하고 있는 매립장에서의 월 평균 메탄산화량을 예측하였다. 예측결과 환경조건이 양호한 지역의 매립지 복토는 메탄의 배출량을 저감시킬 수 있는 효율적인 바이오필터의 효과를 가지지만 환경조건이 불리한 지역의 매립지 복토에서는 바이오필터의 효과가 크지 않는다고 할 수 있다.
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