• 한국환경과학회지
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• 제17권6호
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• pp.601-609
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• 2008

In this study for the development of area due to the increasing of industry, population and spreading of urbanization is rapidly increasing but about seventy percent of our nation's areas consists of the mountainous districts. In such case, when those areas have the heavy rains break, they are washed away by a fast-flowing stream of a valley and overflowed. Thus it could result on human life and property damage and also the widespread of flood damage in the downstream area. To decrease those damage, the construction of flood control reservoir is necessary. This research was aim to construct the flood runoff models of a mountainous small district and to determine the probability rainfall by analyzing precipitation. The study also examined the effects of location and size of flood control reservoir on flood reduction. The result showed that the construction of detention basin was an effective way to ensure the safety of flood control and multiple detention basin had superior result for reducing amount of runoff in the down stream area than the single detention basin.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.218-218
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• 2015

Urbanization and waterworks construction in natural watershed have been causing higher flood risks in lowland areas. Detention basins have become one of the most efficient fundamental instruments for storm water and environmental management at watershed scale. Nowadays, there are many studies coupled numerical methods of flood routing with optimization algorithms to investigate factors that impact on the efficiency of detention basins in flood reduction in a watershed, such as detention basin location, size, and cost and watershed characteristics. Although these couplings have been become more widespread but cumbersome computation and hydraulic data requirement still are their limitations. To tackle the procedure efforts due to numerical integration and data collection, simple approach is proposed to primarily estimate effects of detention basins. The approach basis is the linear system theory applied to the solution of hydrologic flood routing. The paper introduces an analytical method for estimating detention effects deriving by recent studies and innovatively analyses this equation on fractal perspective. Then, an optimization technique is performed by applying harmony search algorithms (HSA) to optimize efficiency of detention basins at watershed scale. The location and size of upstream detention basin are simultaneously obtained. Finally, the proposed methodology, practically applied for a real watershed in Kan river, Iran.

• 상하수도학회지
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• 제18권3호
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• pp.343-350
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• 2004

For the last two decades, Seoul has always been affected by large floods. As climate change causes more frequent localized heavy rains exceeding the capacity of sewer or river to discharge water, flood damage is expected to increase. Under the situation, detention facilities for lacking capacity of sewers can control stormwater runoff to reduce flood damage in urbanized areas. In this study, in order to reduce flood damage in Cheonggyecheon areas, the capacity of detention facilities was decided to make up for the lacking capacity of main sewers in case of the rainfall in July, 2001 as large flood. The average amount of stormwater detained in eight Cheonggyecheon drainage areas is $235.09m^3/ha$. Location and size of stormwater detention facilities is designed to have effects in short term by targeting the reduction of flood damage. Schools and parks are suggested as optimal locations where detention facilities are constructed in drainage areas.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2006년도 학술발표회 논문집
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• pp.884-888
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• 2006

A system was developed to size flood detention storages at the planned Dangjin residing district. Components of system is consisted of module for deriving relationship between elevation and storage, module for calculating sediment elevation, module for setting outflow sizes and elevations, module for reservoir flood routing, and module for ascertaining sizes of detention facilities. And a system was constructed with Visual Basic 6.0. Using this system, sizes of flood detentions are able to be determined very easily and rapidly only by pushing command buttons and by viewing results.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회 논문집
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• pp.1219-1223
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• 2005

This study was accomplished to confirm the possibility of supplying stream minimum flow from detention storage which was determined to reduce peak flows of flood within developing planned district. The results analyzed was summarized as follows; Firstly, Sin-gil district situated in Ansan city was selected, of which watershed area has $0.56km^2$. And detention storage was determined to $5,370m^3$ from analyzing flood volume by the SCS unit hydrograph method. Secondly, using Visual Basic ver 6.0, a detention storage water balance model was developed, in which simulation was based on conditioning storage inflow and outflow according to streamflow volume or rate state. And streamflow was simulated using the DAWAST model. Thirdly, detention operation scenarios were consisted of the combinations with inflow referencing streamflow of 5mm/day, 10mm/day and outflow referencing streamflow of 1mm/day, 2mm/day. The developed detention storage water balance model was operated to simulate daily water storages of detention sized on flood by scenarios. Stream minimum flows were able to be supplied during 209 days to 237 days per a year, total volume of stream minimum flows supplied for this period was analyzed to reach 27 to $55\% of yearly streamflow volume. If inflow criteria of streamflows to detention was considered to be established on a theoretical condition, it is expected to supply stream minimum flows of 20 to $30\% of yearly streamflow from stream to detention. Also to maximize function of supplying urban stream minimum flow from detention storages, sewage waters within developing planned district have to be treated and entered to detention inflow together with streamflows to enrich function of detention planned to reduce flood volumes.

• 한국수자원학회논문집
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• 제39권11호
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• pp.915-922
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• 2006

본 연구는 소방방재청에서 계획하고 있는 도시유역의 침수피해를 방지하기 위한 대책 수립의 일환으로 도시유역의 중상류부에 중소규모의 저류지를 설치하는 방안에 대한 유출저감 효과 분석에 관한 것이다. 이를 위해 시범유역을 선정하여 유출분석을 실시하였고 저류지의 위치와 규모에 따른 유출저감 정도 및 치수안전도 확보 효과를 분석하였다. 분석결과 유역의 유출량을 모두 하도에서 소통시키는 개념이 아닌 유역에서 홍수량의 일부를 저류하여 유량을 분담하는 유역분담 저류지를 설치함으로써 하도의 부담을 완화시킬 수 있음을 확인하였고 저류지의 입지 및 규모의 선정에 따라 그 효과에 큰 차이가 있음을 알 수 있었다. 따라서 중상류부에 저류지를 설치하는 경우 하류부 유출 저감에는 상당히 효과적인 것으로 나타나 유역의 치수안전도 확보에 효율적인 방안이 될것으로 기대된다.

• 한국방재학회 논문집
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• 제5권2호
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• pp.17-28
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• 2005

본 연구의 목적은 소규모 유역에서 홍수 저류시설물과 홍수 조절시설물 사이의 임계지속기간을 평가하는데 있다. 4개 소규모 유역을 통하여 수문분석을 실시하였으며, 유효우량은 NRCS 유효우량 산정방법으로 산정하였다. 홍수 저류시설물과 홍수 조절시설물의 임계지속기간은 허용방류량 고정개념을 이용하여 평가하였다. 허용방류량 고정개념을 이용한 경우 최대 저류비를 발생시키는 시간분포는 Huff 2분위 시간분포로 나타났으며, 자연방류형 단일저류지에서 홍수 조절시설물의 임계지속기간은 홍수 저류시설물의 임계지속기간과 유사한 것으로 나타났다.

• 한국수자원학회논문집
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• 제48권8호
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• pp.673-683
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• 2015

하천 주변의 도시화와 이상기후 등으로 인해 기존의 하천 위주의 홍수방어는 한계를 보이고 있으며, 이에 따라 유역통합적인 홍수방어대책의 하나로 강변저류지 설치에 대한 요구가 증대되고 있다. 강변저류지를 치수대책에 포함시키기 위해서는 정량적인 홍수조절효과 산정이 필요하며, 이를 위해서는 강변저류지 홍수조절효과에 영향을 미치는 인자들의 불확실성을 줄이기 위한 노력이 필요하다. 특히 하천 수위 예측의 중요 변수인 하천 조도계수는 항상 불확실성을 포함하고 있으므로, 이를 고려한 설계방법이 필요하다. 따라서 본 연구에서는 상대적으로 설계자가 자유롭게 결정할 수 있는 설계인자인 강변저류지의 횡월류부 길이를 이용하여 하천 조도계수의 불확실성을 고려한 강변저류지 설계 기법을 제안하고자 한다. 이를 위해 HEC-RAS 부정류 수치모형을 이용하여 하천 조도계수와 횡월류부 길이 변화가 홍수조절효과에 미치는 영향을 검토하였고, 분석결과를 이용하여 하천의 수위 예측 불확실성을 고려한 횡월류부 길이를 결정하는 기법을 제시하였다. 본 연구에서 제시한 횡월류부 길이 결정 기법은 하천 수위 예측의 불확실성을 해결할 수 있기 때문에 강변저류지의 홍수조절효과를 좀 더 안전측으로 제시하는데 도움이 될 것으로 기대한다.

• KIEAE Journal
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• 제10권4호
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• pp.9-17
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• 2010

The purpose of this study is to draw out objective bases for selecting various applicable facilities in case of the establishment of rainwater management strategies. To do so, sixteen facilities were selected from decentralized rainwater management systems that induce rainwater infiltration and detention as well as centralized end-of-pipe type infiltration and detention facilities in local areas. With these facilities, it attempted to evaluate them in terms of sustainability, pollutant elimination, flood control capacity and costs and subsequently analyzed correlations between each characteristic. The outcomes of the analysis were as follows: First was the analysis of characteristics between decentralized rainwater management systems and end-of-pipe rainwater management systems. From the decentralized rainwater management systems, the mulden-rigolen system and grass swale at street level had the highest in the total of the four items while the totals of the underground detention tank and temporary detention site were highest in end-of-pipe rainwater management systems. After analyzing the correlation between different types of facilities and each variable, it can be said that decentralized rainwater management systems have a higher correlation than end-of-pipe rainwater management systems in terms of sustainability whereas the latter are better in flood control capacity than the former. Second, the analysis of correlation in variables of each facility is as follows: first, there is a negative correlation between sustainability value and flood control capacity value; and there is a positive correlation between flood control capability and pollutants elimination. In addition, it revealed that the higher the flood control and pollutant elimination capability the higher the facility costs. Based on these assessments, it is possible to use them as objective selection criteria for facility application in case of site development project or complex plan.

• 한국수자원학회논문집
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• 제41권12호
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• pp.1211-1218
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• 2008

본 연구의 목적은 다목적 유전자 알고리즘을 이용하여 우수유출 저류지를 소유역에 분담하여 설치 계획하는데있다. 이를 위해 우수유출 저류지의 위치 및 규모를 최적화하기 위한 모형을 개발하였다. 이 모형은 크게 2가지로 나뉘어 지는데, 유역유출모형과 최적해를 구하기 위하여 도입한 다목적 유전자 알고리즘(MOGAs)이다. 이러한 최적화 모형을 모의하기 위하여 목적함수는 첨두유출량과 저류지 저류용량의 함수로 설정하고, 제한조건은 기본적으로 구조적 제한과 저류용량 및 운영목적에 따라 설정하였다. 본 연구를 위해 만들어진 최적화 모형은 안양시 관양유역에 실제 적용해 보았으며, 그 결과 주어진 제약조건내에서 상류지역에 저류지가 설치되는 경우가 최적값으로 나타난 것을 통해 적절하게 잘 모의된 것으로 보인다. 그밖에 On-line 및 Off-line 저류지가 동시에 건설되는 경우에도 함께 최적화 모의가 가능한지도 살펴보았다. 본 연구를 통해 제시한 방법론은 향후 도시유역내의 홍수피해 저감계획시 활용될 수 있을 것이다.