• 한국환경복원기술학회지
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• 제17권3호
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• pp.1-11
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• 2014

Recently, major cities in Korea are suffering from frequent urban flooding caused by heavy rainfall. Such urban flooding mainly occurs due to the limited design capacity of the current drainage network, which increases the vulnerability of the cities to cope with intense precipitation events brought about by climate change. In other words, it can be interpreted that runoff exceeding the design capacity of the drainage network and increased impervious surfaces in the urban cities can overburden the current drainage system and cause floods. The study presents the green roof as a sustainable solution for this issue, and suggests the pre-design using the LID controls model in SWMM to establish more specific flood prevention system. In order to conduct the computer simulation in connection with Korean climate, the study used the measured precipitation data from Cheonan Station of Korea Meteorological Administration (KMA) and the forecasted precipitation data from RCP 8.5 scenario. As a result, Extensive Green Roof System reduced the peak runoff by 53.5% with the past storm events and by 54.9% with the future storm events. The runoff efficiency was decreased to 4% and 7%. This results can be understood that Extensive Green Roof System works effectively in reducing the peak runoff instead of reducing the total stormwater runoff.

• 한국물환경학회지
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• 제23권4호
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• pp.490-497
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• 2007

A Combined sewer overflows (CSOs) are themselves a significant source of water pollution. Therefore, the control of urban drainage for CSOs reduction and receiving water quality protection is needed. Examples in combined sewer systems include downstream storage facilities that detain runoff during periods of high flow and allow the detained water to be conveyed by an interceptor sewer to a centralized treatment plant during periods of low flow. The design of such facilities as stormwater detention storage is highly dependant on the temporal variability of storage capacity available (which is influenced by the duration of interevent dry periods) as well as the infiltration capacity of soil and recovery of depression storage. As a result, a continuous approach is required to adequately size such facilities. This study for the continuous long-term analysis of urban drainage system used analytical probabilistic model based on derived probability distribution theory. As an alternative to the modeling of urban drainage system for planning or screening level analysis of runoff control alternatives, this model have evolved that offer much ease and flexibility in terms of computation while considering long-term meteorology. This study presented rainfall and runoff characteristics of the subject area using analytical probabilistic model. This study presented the average annual COSs and number of COSs when the interceptor capacity is in the range $3{\times}DWF$ (dry weather flow). Also, calculated the average annual mass of pollutant lost in CSOs using Event Mean Concentration. Finally, this study presented a decision of storage volume for CSOs reduction and water quality protection.

• 대한환경공학회지
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• 제22권4호
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• pp.689-698
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• 2000

강우시 발생되는 강우유출수는 배수구역내 지표오염물질로부터 기인한 다양한 오엽물질을 포함하고 있으며 전세계적으로 이에 대한 많은 연구가 진행중에 있다. 초기강우시 신업공단에서 발생되는 지표유출수내 오염물질의 특성은 아직도 완벽하게 이해되지 못하고 있다. 일반적으로 분류식 배제방식이 채택된 공단에서 발생되는 우수유출수는 다양한 오염물질을 함유한 채 미처리 상태로 전량 지천으로 배출되고 있다. 본 연구는 산업공단을 대상으로 강우시 지표유출수의 수질과 특성을 분석 평가하였고 시료 채취는 공단을 배수구역별 4개 구역으로 구획 후 해당 배수구역에 대해 grab sampling 방법을 적용하였다. 석유 화학산업과 일반 야적장 등에서는 BOD, COD, SS, TN 등의 일반오염물 항목들이 주로 검출된 반면, 기계 금속산업, 고철 야적장 지역에서는 중금속항목의 오염물이 고농도로 측정되었다. 초기강우유출시 전 조사지점의 지표유출수에서 Fe, Zn, Cu 등의 항목이 주로 검출된 반면, Pb, As, Cd, Cr, Ni 등은 미량으로 검출되었고 Hg는 어느 지점에서도 검출되지 않았다. 산업공단에서 발생하는 지표유출수내 오염물질들은 대부분 업종과 연관성을 나타내었고, 각 지점별 발생 오염물질의 농도는 오염물질의 노출정도 및 강우사상의 특성에 따라 결정되어지는 것으로 나타났다.

• 환경영향평가
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• 제31권1호
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• pp.1-10
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• 2022

본 연구는 비점오염원 저감시설인 차집시설을 대상으로 다양한 강우조건에 따라 초기우수 유출수의 수질특성을 파악하고, 용존성 오염물질의 기원을 파악하기 위하여 수행되었다. 본 연구는 도시지역 내 위치한 G-배수구역의 10개 차집시설 중 비강우시에도 불명수가 유입되는 것으로 조사된 차집시설 #1, #5, #8, #9 및 #10 등 5개 지점에서 수질분석을 통하여 차집시설에서 비점오염물질의 유출특성을 파악하였다. 연구결과로써 강우량에 따라 차집시설에서 우수유출수의 수질특성에 영향을 받는 것으로 판단되었다. 비강우시 EC, BOD, TOC, TN의 평균농도는 강우시에 비하여 높은 것으로 조사되었으며, DO의 평균농도는 강우시에 비하여 낮은 것으로 조사되었다. 또한, 차집시설에서 유출수의 용존성 유기물은 주로 내부에서 생성된 유기물로 구성된 것으로 판단되었다. 우수유출수는 주변 환경에서 유입되는 오염물질의 영향을 많이 받으며, 강우로 인하여 차집시설의 외부로부터 유입되는 난분해성 휴믹계 물질이 많아진 것으로 판단된다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회 논문집
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• pp.1199-1203
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• 2005

Combined sewer overflows(CSOs) are themselves a significant source of water pollution. Therefore, the control of urban drainage for CSOs reduction and receiving water quality protection is needed. Examples in combined sewer systems include downstream storage facilities that detain runoff during periods of high flow and allow the detained water to be conveyed by an interceptor sewer to a centralized treatment plant during periods of low flow. The design of such facilities as stormwater detention storage is highly dependant on the temporal variability of storage capacity available(which is influenced by the duration of interevent dry periods) as well as the infiltration capacity of soil and recovery of depression storage. As a result, a contiunous approach is required to adequately size such facilities. This study for the continuous long-term analysis of urban dranage system used analytical Probabilistic model based on derived probability distribution theory. As an alternative to the modeling of urban drainage system for planning or screening level analysis of runoff control alternatives, this model have evolved that offer much ease and flexibility in terms of computation while considering long-term meteorology. This study presented rainfall and runoff characteristics or the subject area using analytical Probabilistic model. Runoff characteristics manifasted the unique characteristics of the subject area with the infiltration capacity of soil and recovery of depression storage and was examined appropriately by sensitivity analysis. This study presented the average annual COSs and number of COSs when the interceptor capacity is in the range 3xDWF(dry weather flow). Also, calculated the average annual mass of pollutant lost in CSOs using Event Mean Concentration. Finally, this study presented a dicision of storage volume for CSOs reduction and water quality protection.

• 물과 미래
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• 제28권3호
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• pp.159-173
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• 1995

본 연구는 도시화로 인해 야기되는 도시유역의 홍수재해를 경감시키기 위하여 우수유출억제대책으로 유역내의 일부에 지체저류시설을 설치하는 방안을 검토하는 것으로서, 도시화의 진전상태에 따라 도시유역의 수문응답특성을 파악하고 적정 지체저류시설의 위치와 크기를 결정하기 위해 유역면적이 각각 1$\textrm{km}^2$, 10$\textrm{km}^2$인 가상의 소유역 및 전유역과 실제 도시유역을 대상으로 해석하였다. 강우빈도, 토지이용단계, 배수패턴, 허용방류량의 규모에 대해 도시화의 진전상태에 따른 수문응답특성을 파악하였으며, 실유역으로는 서울특별시의 잠실 2 및 성내 1 유수지 배수구역을 선정하여 지체저류시설의 크기와 위치를 나타내는 회귀식을 유도하여 제시하였다.

• 한국물환경학회지
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• 제32권6호
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• pp.562-569
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• 2016

Recently, Low Impact Development (LID) is being used in Korea to control urban runoff and nonpoint source pollution. In this study, we evaluated the reduction of surface runoff from a study area, as the effect of connecting three bioretention as LID-BMP. Surface runoff and storage volume of bioretention is estimated by the Curve Number (CN) method. In this study, the storage volume of bioretention is divided by the volume of surface runoff and precipitation which directly enters the bioretention. The ratio of captured surface runoff volume to storage volume is highly influenced by the ratio of drainage area to surface area of bioretention. The high bioretention surface area-to-drainage area ratio captures more surface runoff. The ratio of 1.2 captures 51~54% of the total surface runoff, ranging from 5-30cm of bioretention depth; a ratio of 6.2 captures 81~85%. Three connected bioretentions could therefore captures much more runoff volume, ranging from $35.8{\sim}167.3m^3$, as compared to three disconnected bioretentions at their maximum amount of precipitation with non-effluent from the connecting three bioretentions. Hence, connecting LID-BMPs could improve the removal efficiencies of surface runoff volume and nonpoint source pollution.

• 한국수자원학회논문집
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• 제47권9호
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• pp.789-799
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• 2014

본 연구는 도시지역의 내수침수 특성을 고려한 내수침수위험도 산정방법을 제시하였다. 의사결정과정에서 발생할 수 있는 불확실성을 정량적으로 반영하기 위하여 Fuzzy AHP 기법을 활용하였다. 내수침수 위험도의 평가기준으로는 물리적 지표, 사회적 지표, 그리고 내수침수 시나리오 결과 등 세 가지로 구성하였다. 각각의 평가기준은 3개의 세부평가항목을 가지고 있어 총 9가지의 평가항목을 바탕으로 내수침수 위험도 분석을 수행하였다. 또한, 행정구역 단위가 아닌 배수시스템의 노드(맨홀)를 기준으로 침수위험도를 분석하여 침수위험도가 높은 지점을 상세하게 표현할 수 있었다. 본 연구의 대상지역인 부산시 거제지구에 Fuzzy AHP 기법을 적용한 결과, 온천천 거제천 합류부 저지대의 침수위험도가 크게 나타났으며, 이는 과거 피해이력과 일치하는 것이다. Fuzzy AHP 기법을 적용한 본 연구결과는 내수침수 위험도 산정 및 고위험도 지역의 내수침수 저감계획 수립을 위한 자료로 활용될 수 있을 것이다.

• 한국물환경학회지
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• 제23권1호
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• pp.155-160
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• 2007

Constructed wetland has been widely used for the treatment of sewage, stormwater runoff, industrial wastewater, agricultural runoff, acid mine drainage and landfill leachate. For the removal of nitrogen and phosphorus, uptake by plants and adsorption to media material are the major processes, and, therefore, the selection of media with specific adsorption capacity is the critical factor for the optimal design of wetland along with the selection of appropriate plant species. In this study, two media materials (loess bead and mixed media) possessing different adsorption characteristics for ammonium and phosphate were selected, and their adsorption characteristics were evaluated. In addition, the performance of subsurface-flow wetland systems employing these media was evaluated in both batch and continuous flow systems. With LB medium, beter phosphorus removal was observed, while better ammonia removal was obtained with MM medium. In addition, enhanced removal efficiencies were observed in the wetland systems employing both media and aquatic plants, mainly due to the better environment for microbial growth. As a result, appropriate selection or combination of media with respect to the inflow water quality maybe important factors for the successful design and operation of wetland systems.

• 한국조경학회지
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• 제32권2호
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• pp.78-85
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• 2004

To manage rainwater environmentally friendly, it is necessary to let the rainwater be infiltrated naturally and make reservoirs to detain it in the chosen spot. Not only should it be prepared to handle the city flood, but also it be a necessary alternative for establishing the ecological water circular system in cities. Therefore, considering the present rainwater. management system, this study analysed the status of products which can be interchanged from existent systems to rainwater infiltrating systems. In this study, the infiltrating equipment that is applicable to the Korean drainage system was developed. The case was studied out to investigate the effects of infiltrating and the detaining ability of the developed product. The case site, block 6 of Sang-am residence, was selected and analyzed. The amount of infiltration and detention per unit of the introduced facilities, i.e., infiltrating pipes and tanks were calculated. In this research, the amount of each infiltrating tank was revealed to be 1.353 m/hr and the amount of detention as 0.299 m/hr. And the amount of each infiltrating pipe was found to be 0.541 m/hr and the amount of detention was 0.118 m/hr. To examine the effects of the system, the total amount of the outlet before and after installing was compared and calculated. In doing this, a basis for deciding the arrangement and number of tanks and pipes of the infiltrating system was made.