• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.575-578
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• 2003

Constructed wetlands have become a popular technology for treating contaminated surface and wastewater. In this study, the field experiment to reduce nonpoint source pollution from watershed runoff during rainy day using wetland and pond. TSS and T-N removal rate of wetland-pond system and pond-wetland system was 91% and 73%, 94% and 70%, respectively and values were same range. $BOD_5$ and T-P removal rate of pond-wetland system (38% and 78%) was higher than wetland-pond system (27% and 62%). overall, pond-wetland system is more useful than wetland-pond system to control NPS.

• Journal of Korean Society of Water and Wastewater
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• v.20 no.5
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• pp.709-717
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• 2006

This research was conducted to figure out the feasibility of several sorption materials to treat various pollutants in road runoff. In advance of the major feasibility test with various sorption materials, the separation process with $1.2{\mu}m$ filter was conducted and showed that slight portion of pollutants was removed(Orgamic pollutant - 20%, Nutrient salt - 50%, Heavy metals - 0~30%). To remove dissolved pollutants in runoff, various materials were tested through an isotherm sorption experiment. As a result, GAC showed most effective material among them to lessen most contaminants such as organic compounds and nutrients. On the other hand, ion-exchange resin and Zeolite showed limited usefulness on the some heavy metals. Freundlich model was most suitable for the current experiment data, and the amount of adsorbent (GAC) could calculated based on this model.

• Advances in environmental research
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• v.8 no.1
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• pp.55-69
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• 2019

The generation of ferrous slag, an industrial by-product from the iron ore industry, results in serious environmental problems. The chemical compositions indicate 30-34% SiO₂, 30-34% CaO, 18-22% Al₂O₃ and 0.5-0.6% Fe₂O₃. The specific gravity, moisture content and pH are in the range of 1.3-1.65, 9.1-10% and 8.5-9.0 respectively. The major part of the slag is composed of sand-size particles. The problems of disposal of slag could be minimized by considering its use in various environmental engineering applications providing additional value to the by-product. This paper mainly focuses on the potential utilization and valorisation of ferrous slag in both water and wastewater treatments. It is effective for the treatment of water and wastewater containing nutrients, heavy metals and polluted river/stormwater.

• Magazine of the Korean Society of Agricultural Engineers
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• v.45 no.4
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• pp.89-97
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• 2003

Using inference models developed for estimation of the parameters necessary to implement the Runoff Block of the Stormwater Management Model (SWMM), a number of alternative inference scenarios were developed to assess the influence of inference model complexity and structure on the calibration of the catchment modelling system. These inference models varied from the assumption of a spatially invariant value (catchment average) to spatially variable with each subcatchment having its own unique values. Fur-thermore, the influence of different measures of deviation between the recorded information and simulation predictions were considered. The results of these investigations indicate that the model performance is more influenced by model structure than complexity, and control parameter values are very much dependent on objective function selected as this factor was the most influential for both the initial estimates and the final results.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1124-1128
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• 2010

본 연구는 도시 개발이전의 유황곡선과 개발이후의 유황곡선을 일치시키기 위하여 강우유출수 제어설비의 크기 결정과 관련된 복합 설계기법을 제안하는데 있다. 우선 CN값을 산출 및 보정한 후, IETD에 따라 분할된 강우사상에 NRCS-CN 방법을 적용하여 직접유출량과 침투량을 산정한다. 직접유출량과 침투량의 장기적인 통계치는 개발이전, 개발이후, 개발이후 유수지 설계, 그리고 개발이후 제안된 복합설계의 경우에 대하여 각각 분석된다. 개발이전의 직접유출량과 침투량을 재현하기 위해서 유전자 알고리즘을 적용하여 유수지 및 저류지의 크기를 추정한다. 분석결과 복합설계 강우유출수 제어설비를 적용하였을 때 개발이전의 지표면 유출수와 침투수의 평균을 잘 재현하였고, 개발이전의 유황곡선이 개선될 여지가 충분히 있음을 확인하였다.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.7 no.4
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• pp.17-31
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• 2004

How far of natural regeneration of the city and improvement on the urban environment will be possible in the replanting on the impermeable surface? The replanting of what kind of form will be obtained in order to realize it? The regeneration of the nature is possible, if it can be realized at the thin soil layer in which the result of being equivalent to the natural soil function. Using the light artificial soil with the water retentiveness, it is possible that green on the artificial ground reinforces the green skeleton of the city. The green of artificial ground improves the thermal ambience of the city and demonstrates stormwater runoff depression effect. It is necessary to built the landscape which continues with the surrounding green. Ecologically stabilizing green has the high amenity. The development of replanting technology of the artificial ground which fosters the city culture is desired.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.142-142
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• 2015

저영향개발 기법은 유역개발에 따른 수문 및 환경적 영향을 최소화하기 위해 자연상태를 가급적 보존하고 불투수 면적을 최대한 줄이며, 우수발생 지점에서부터 소규모로 우수를 관리하는 분산식 우수배제 방식을 지향한다. 본 연구의 목적은 이러한 저영향개발 기법을 이용한 도시유역의 우수관리에 관한 효과를 기술적, 경제적 관점에서 정량적으로 평가하는 것이다. 이를 위해 기존 개발 방식으로 계획된 송산 그린시티 동측지구에 저영향개발 기법을 적용하였고, 결과를 기존 개발 방식과 비교하여 저영향개발 기법의 효과를 분석하였다. 대상유역에 대하여 저영향개발 기법을 적용하기 위해 분산식 우수배제 방식을 도입하였고(그림 1), 식생수로와 인공습지 등의 저영향개발 요소기술을 적용하였다(그림 2). 연구에서는 SWMM을 이용하여 저영향개발 기법과 기존 개발 방식에 의한 우수관리를 각각 모의하였고, 모의 결과를 홍수, 물순환, 비점오염 저감의 관점에서 비교 검토하였다(그림 3과 4). 또한, 개략 공사비 산정을 통해 기존 개발 방식 대비 저영향개발 기술의 경제적 효과를 분석하였다. 그 결과, 저영향개발 기법을 적용할 경우, 상대적으로 저 비용으로도 기존 개발 방식에 의한 우수관리보다 더 높은 효과를 달성할 수 있는 것으로 분석되었다.

• Journal of Korean Society on Water Environment
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• v.27 no.3
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• pp.257-263
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• 2011

This study analyzes the correlations between non-point sources and runoff to estimate non-point sources for effective management. From the monitoring results, the correlation factors among pollutant mass loading, EMC, total runoff volume and average flow are calculated. And using correlation factors, the most related two constituents are determined. Also the most appropriate regression between two constituents are determined. Pollutant mass loading and total runoff volume has the highest correlation. Also, compound regression is found to be the most appropriate regression. This shows that pollutant mass loading increases as total runoff volume increases. It is not continuous increase but has some pattern.

• Geomechanics and Engineering
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• v.30 no.4
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• pp.353-362
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• 2022

The seismic failure-prone region in Istanbul has been examined in terms of the segmented pipelines. Although some researchers have suggested that this territory should be left as a green land, many people continue to live in this area. This region is about 9-10 km away from the North Anatolian Fault Line. This fault zone is an active right-lateral strike-slip fault line in Turkey and an earthquake with a magnitude of 7.0-7.5 is expected in the Marmara Sea. Therefore, superstructures and infrastructures are under both land sliding risks and seismic risks in this area. Because there are not any pipeline-fault line intersection points in the region, in this study, it has been focused on the behaviors of the segmented (sewage or stormwater) pipelines subject to earthquake-induced permanent ground deformation and seismic wave propagation. Based on the elastic beam theory some necessary analyses have been carried out and obtained results of this approximation have been examined.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1996.12a
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• pp.87-95
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• 1996

The stabilization and reclamation of old disposal sites is becoming more important as significant numbers of disposal sites are closed and abandoned. This technical paper covers an overview of the key issues and methodologies for stabilizing and constructing facilities on old landfills. The slide portion of this presentation also include photographs showing actual construction activities. The key issues that are prevalent in remediating and closing old landfills are : correcting the stormwater flow, leachate breakout, constructing cover caps, controlling landfill gas migration and odors, cleanup groundwater and stabilizing side slopes. Some key techniques for constructing facilities on old landfills include： use of piling, installation of active landfill gas systems, providing LFG barriers under buildings, using utilidors and flexible utility interfaces and designing for site settlement. This Paper provides proven conceptual methods for solving these problems.