Journal of Environmental Impact Assessment 2021 KCI Impact Factor : 0.74

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pISSN : 1225-7184
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2009, Vol.18, No.2

  • 1.

    Lake Water Quality Modelling Considering Rainfall-Runoff Pollution Loads

    CHO JAE HEON , Sung-Hyo Kang | 2009, 18(2) | pp.59~67 | number of Cited : 1
    Abstract PDF
    Water quality of the Lake Youngrang in the Sokcho City is eutrophic. Jangcheon is the largest inflow source to the lake. Major pollutant sources are stormwater runoff from resort areas and various land uses in the Jangcheon watershed. A storm sewer on the southern end of the lake is also an important pollution source. In this study, water quality modelling for Lake Youngrang was carried out considering the rainfall-runoff pollution loads from the watershed. The rainfallrunoff curves and the rainfall-runoff pollutant load curves were derived from the rainfall-runoff survey data during the recent 4 years. The rainfall-runoff pollution loads and flow from the Jangcheon watershed and the storm sewer were estimated using the two kinds of curves, and they were used as the flow and the boundary data of the WASP model. With the measured water quality data of the year 2005 and 2006, WASP model was calibrated. Non-point pollution control measures such as wet pond and infiltration trench were considered as the alternative for water quality management of the lake. The predicted water quality were compared with those under the present condition, and the improvement effect of the lake water quality were analyzed.
  • 2.

    Development of Greenhouse Gas Emission Factor of B-C Oil Fired Power Plants in Korea

    김진수 , 이시형 , Soojeong Myeong and 5 other persons | 2009, 18(2) | pp.69~78 | number of Cited : 1
    Abstract PDF
    In order to provide fundamental data for developing greenhouse gas emission factor, we investigated power plants in Korea using B-C oil as Energy source. The power plant is a major source of greenhouse gases among the sectors of fossil fuel combustion, thus information of its emission factors is very essential to the establishment of control strategies for the greenhouse gas emissions. The caloric value of fuel was analyzed using calorimeter and the calorific value was 10,419 kcal/kg. The CO2 concentration of flue gas and elemental analysis were conducted using GC-FID and elemental analyzer. The CO2 emission factors from fuel analysis was 75,410 kg/TJ and that from CO2 gas analysis was 94,265 kg/TJ. When compared with IPCC values, the emission factors by the fuel analysis was 2.5% lower, and that by CO2 gas analysis was about 21.85% higher.
  • 3.

    A Study on the Quality Improvement of Secondary Treatment Effluent Utilize the Natural Purification Method

    안태웅 , 최이송 , oh Jong-Min | 2009, 18(2) | pp.79~87 | number of Cited : 4
    Abstract PDF
    This study was performed for the application of porous concrete blocks and aquatic plants for the water purification in small urban stream. This study investigated the ability of water purification according to various environments, algae and aquatic plants. When the porous concrete was used as contact media, the average removal efficiencies of SS, BOD and COD were 85~95%, 50~60% and 65~75%, respectively. Also, when the porous concrete and aquatic plants was used the average removal efficiency of SS, BOD and COD were 90∼95%, 60~70% and 70~80%, respectively. As the results, average removal efficiency of total nitrogen, at the condition of the porous concrete and aquatic plants, was about 40-50%, then, that of total phosphorus was about 60-70%.
  • 4.

    A Study on the Road Traffic Noise Effect Using a Noise Map - Development of Sihwa Multi Techno Valley -

    정재훈 , Kwon Woo-Teag , Hyung Chul Kim and 1 other persons | 2009, 18(2) | pp.89~97 | number of Cited : 0
    Abstract PDF
    Korean society is faced with various new problems arising from the development projects of new towns, industrial cities, large-scale residential complexes, etc. started from the 1970s. Particularly with the construction of residential and industrial complexes by the roadsides, they are openly exposed to road traffic noise and vibration. Thus, the objective of this study is to examine using noise maps how increasing traffic volume affects road traffic noise and what problems it causes in areas where new towns or complexes are constructed by development projects. According to the results of this study, in areas around the sites of development projects, the noise level increased by road traffic noise compared to that before development and was 1.16~6.92 times higher than the environmental noise standard, but measures to reduce road traffic noise was lukewarm. In addition, areas with soundproof facilities showed a noise level 1~3 step lower than other areas, and in individual buildings, the noise level on the side facing the road was 1~2 step higher than that on the rear side.
  • 5.

    Parameter Optimization of QUAL2K Using Influence Coefficient Algorithm and Genetic Algorithm

    CHO JAE HEON , Chang-Hun Lee | 2009, 18(2) | pp.99~109 | number of Cited : 4
    Abstract PDF
    In general, manual calibration is commonly used for the stream water quality modelling. Because the manual calibration depends upon the subjectivity and experience of the researcher, it has a problem with the objectivity of the modelling. Thus, the interest about the automatic calibration by the optimization technique is deeply increased. In this study, Influence coefficient algorithm and Genetic algorithm are introduced to develop an automatic calibration model for the QUAL2K that are the latest version of the QUAL2E. Genetic algorithm, used in this study, is very simple and easy to understand but also applicable to any complicated mathematical problem, and it can find out the global optimum solution effectively. The developed automatic calibration model is applied to the Gangneung Namdaecheon. The calibration results about the 11 water quality variables show the good correspondence between the calculated and observed water quality values.