• Journal of Environmental Health Sciences
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• v.28 no.2
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• pp.61-69
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• 2002

Oship stream is located nearby south eastern coasts. This study was performed to find out waters quality modeling and then to predict water quality of Oship stream. Based on survey data, BOD, T-N, T-P calibration and verification result were in good agreement with measured value within mean coefficient variance(MSE) value, which were 13.9%, 9.0%, 26.5% and 19.5%, 12.0%, 16.5%, respectively. Sectional water quality predictions of the main stream of Oship stream are executed on the basis of the following cases 1) with sewage treatment of Dogye-eup 2) reduction of mine wastewater treatment of 80% in th basin. As a result, BOD, T-P improvement rates at down stream of Oship stream, case 1) were appeared 12.2%, 22.2%, case 2) maximum sulfate ion and conductivity reduction removal rate of Oship stream were 58%, 68%. The main pollution sources of Oship-stream were almost domestic wastewater and mine wastewater discharged from Dogye-eup which located in uppers stream. The large effects will appear after the construction of Dogye sewage water treatment plant which remove the organic matter and nutrients in these sewage water. The waste water from mine can not easily to treat for characteristics of effluence and economic problems. However, to achieve the goal of water quality in Oship-stream water system, treatments of those are necessary.

• Geomechanics and Engineering
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• v.20 no.6
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• pp.547-556
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• 2020

An understanding of the influence of MR (Magmatic Rock) thickness on the surrounding rock behaviors is essential for the prevention and management of dynamic disasters in coal mining. In this study, we used FLC3D to study the breaking and instability laws of surrounding rock with different MR thicknesses in terms of strata movement, stress and energy. The mechanism of dynamic disasters was revealed. The results show that the thicker the MR is, (1) the smaller the subsidence of the overlying strata is, but the subsidence span of the overlying strata become wider, and the corresponding displacement deformation value of the basin edge become smaller. (2) the slower the growth rate of abutment pressure in front of the working face is, but the peak value is smaller, and the influence range is larger. The peak value decreases rapidly after the breaking, and the stress concentration coefficient is maintained at about 1.31. (3) the slower the peak energy in front of coal wall, but the range of energy concentration increases (isoline "O" type energy circle). Finally, a case study was conducted to verify the disaster-causing mechanism. We anticipate that the research findings presented herein can assist in the control of dynamic hazards.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.432-432
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• 2011

유역종합치수계획은 홍수유출을 조절시킬 수 있는 자연 또는 인공 시설물들을 유역 전반에 걸쳐 종합적으로 연계 운영하는 구조적 수단과 비구조적 수단을 동원함으로서 유역의 홍수피해 저감 능력을 극대화하고자 하는 계획이다. 하지만 유역종합치수계획의 비구조적 측면은 이상기후로 인한 극단적인 형태의 홍수, 제도적인 연계성 부족으로 관계기관, 유역주민, 법적 행정적 뒷받침 등의 문제점을 가지고 있다. 따라서 본 연구는 국내 유역종합치수계획과 하천기본계획과의 연계성 문제, 유역의 홍수방어 대책, 유역 협의체의 구성 등에 대한 문제점 및 개선방안을 검토하였다. 이를 위해 미국의 유역종합치수제도와 일본의 유역종합치수대책 및 특정도시하천유역치수계획의 선진 외국의 유역종합관리 현황 및 최근의 변화 과정을 비교 분석하여 국내 유역종합치수계획에 대한 적용성 및 개선방안을 분석하였다. 아울러 유역종합치수계획에서 지자체간의 연계성을 위한 통합적인 유역협의회 구성 및 운영의 문제, 유역분담 홍수량 저감시설물의 설치를 위한 법적 제도적 장치의 문제, 전국적인 유역종합치수사업의 시행에 필요한 법적 제도적인 문제를 확인하였으며 이에 대한 개선방안을 도출하였다.

• Journal of Environmental Impact Assessment
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• v.13 no.3
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• pp.115-124
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• 2004

To utilize a closed municipal solid waste landfill site in environmentally secure conditions, it is necessary to verify the stabilization level of landfill leachate. To assess leachate stabilization of an open-dumping municipal solid waste landfill (Noeun Landfill) which is located at the upper drainage basin of Namhan River which flows into Lake Paldang utilized for Seoul Metropolitan water supplies, the surrounding characteristics of the landfill site was surveyed. After then, leachate, groundwater and soil samples from this landfill were chemically analyzed, and the analysis results were evaluated by "The Criteria of Landfill Waste Stabilization(CLWS)", "Discharge Criteria of Landfill Leachate", "The Criteria of Domestic Use in Groundwater Quality", and "Soil Contamination Criteria" promulgated by Korean Ministry of Environment. The closed open-dumping landfill was equipped with the final soil cover, 3 groundwater monitoring wells and poor landfill gas extraction devices for the post-closure management of the landfill. BOD/CODcr ratios in leachate were less than or slightly higher than 1/10. This results seemed to imply that the leachate stabilization level of this landfill based on the CLWS was almost completed. Qualities of groundwater sampled from monitoring wells located at outside of landfill were adequate for "The Criteria of Domestic Use in Groundwater Quality". Finally, concentrations of soil contaminants that were likely to be influenced by this landfill site were adequate to "Soil Contamination Criteria".

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1742-1746
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• 2007

현재 우리나라는 건설교통부, 한국수자원공사 등에서 많은 수위 관측소를 설치 운영하고 있지만 대부분의 수위 관측지점은 유량환산시에 이용되는 수위-유량관계곡선이 지속적으로 개발되지 못하고 있기 때문에 신뢰성 높은 유출량 자료를 제공하지 못하고 있을 뿐만아니라 유출에 기여하고 있는 유출성분에 따른 유출비율 등을 파악하지 못함으로서 유동적인 유역 수자원관리가 어려운 실정이다. 따라서 과학적이고 통합적인 수자원 관리를 위해서는 유역내 수자원의 이동경로를 비롯해서 수자원의 정량적 변화를 명확하게 파악할 수 있어야 하며 또한 강수로 인해 발생될 수 있는 유출량을 보다 정확하고 상세하게 파악할 수 있어야만 하기 때문에 본 연구에서는 다년간 유역정밀조사와 현장조사를 실시한 바 있는 금강유역을 대상으로 유출성분별 유출량을 상세히 분석하고자 인위적요소인 용수이용량 및 회귀율 등을 반영한 사실적인 유출을 모의하는 유역관리모형을 통해 유출량을 검증하고 이를 유출성분별로 분리한 후 유역내 물수지분석을 실시하였다.

• Journal of Environmental Impact Assessment
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• v.9 no.3
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• pp.239-248
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• 2000

The aggravating water quality from the expansion of industrialization along with increasing population lead to develop more intensive physical measures to secure better drinking water quality. This study was mainly initiated to establish a water-pollutant buffering zone for the upper stream basin of Paldang--the major source area of drinking water for the metropolitan Seoul and suburban areas with a population more than 13 million. Two different criteria were considered in determining the buffering distance from the edge of the streamflow : 1km-width buffer zone for the special protection area which has been strictly controlled by the conventional laws for the protection of drinking water supply, and 500m-width buffer zone for the rest of the area. To delineate the exact boundaries of the water-pollutant buffering zone, GIS database was created integrating topography, hydrography, cadastral, and other related layers. The newly designated water-pollutant buffering zone would contribute to improve the water quality in a long term along with the conservation of the wet land. More study, however, should be made within the water-pollutant buffering zone such as the detailed survey of the pollutants, vegetation, and ecosystem for more effective management of the buffering zone.

• Journal of Korean Society of Forest Science
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• v.35 no.1
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• pp.33-35
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• 1977

The mean height growth of 1-1 Picea abies seedlings originated from two provenances, i.e., Hartz above 600m of altitude and Fichtel (Ober Pfalzer basin below 800m) were measured. The progeny from Fichtel out grew those of Harz. about 70% as fast as did tree from Hartz. The variance due to replications was greater in Fichtel than in Hartz. 1-0. Quercus borealis seedlings showed vigorous height growth. All these experiments were performed at Yangsan-gun Habuk-myeon, south-east place in Korea.

• Journal of Korean Port Research
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• v.13 no.2
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• pp.419-426
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• 1999

It is essential for port planning, coastal zone management and environmental impact study to analyze the variation of current and water quality due to the development of water area and discharged water from estuary barrage and basin etc. Mokpo sea area downstreams from a long river and two large basins, the Yongsan river and Yongam-Kumho basins discharging much of water through water gates for the purpose of flood control and prohibition of salt intrusion to the inland fresh water area. In this study, the numerical calculations were carried out for the analysis of diffusion characteristics due to discharging operation, adapting the results of tidal current simulation ADI methord is applied to the governing equation for the movement of sea water and diffusion and 6-point method to the advection terms of diffusion equation. As the results of this study, it is known that the discharging operation causes increasing and/or decreasing of current velocity and enlarging and/or depressing of pollutant diffusion limits depending on the distance from the discharging gates and the mode of discharging operation. To utilize these result, the linked gate operation and the method increasing exchange of sea water must be considered.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.7 no.10
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• pp.17-27
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• 1984

In order to foster the minor enterprises effectively we will have to take a proper step to control and adjust the excessive competitions of large-enterprises and minor as well as among minor enterprises, We should promote the relationship serialized between minor - and large - enterprises and establish mediation and control organizations and governmental policies to create re-subcontract among small and medium enterprises. To help the development of medium md small enterprises in Jeon-Buk area, therefore, Kunsan city should be designated as a Growth Position City. The reason is as follows. 1) Because Kunsan is located in Middle Western Seaside geographycally, and in the central place of our country as a key point of sea-transportation, we can cultivate the national land widely. 2) As an ocean gateway city of Kum River basin, Kunsan is a good place that can reform Hoh-nam inland of Kwang-iu, Jeon-ju, I-ri, and like places as well as central inland area of Dae-jeon, Chong-ju, etc.. 3) Kunsan is an advanced-base for constituting an industrial region of Weatern roast that has a spacious coastral industrial region and is connected with inland industrial park of Jeon-ju and I-ri and Jang-hang, Bi-in, etc.. From the above reason. Kunsan should be designated as a growth position city that can induce and promote the development of center of Western coast.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1999.10a
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• pp.253-261
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• 1999

It is essential for port planning, coastal zone management and environmental impact study to analyze the variation of current and water quality due to the development of water area and discharged water from the estuary barrage and basin, etc. Mokpo sea area has downstream from a long river and two large basins, the Yongsan river and Yongam-Kumho basins, discharging much of water through water gates for the purpose of flood and prohibition of salt intrusion to the inland fresh water area. In this study, the numerical calculation were carried out for the analysis of diffusion characteristics due to discharging operation, adopting the results of tidal current simulation. ADI method is applied to the governing equation for the movement of sea water and diffusion and 6-point method to the advection terms of diffusion equation. As the results of this study, it is known that the discharging operation causes increasing and/or decreasing of current velocity and enlarging and/or depressing of pollutant diffusion limits depending on the distance from the discharging gates and the modes of discharging operation. To utilize these result, the linked gate operation and the method increasing exchange of sea water must be considered.