• Title/Summary/Keyword: urban-runoff

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Comparison of Flood inundations Considering the Inland Flood (내수침수의 영향을 고려한 홍수범람 비교연구)

  • Baek, Hyung-Jo;Lee, Hyun-Seok;Yi, Yong-Kon;Koh, Deuk-Koo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2006.05a
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    • pp.1206-1210
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    • 2006
  • 본 연구에서는 천수방정식을 지배방정식으로 하고, 유한 체적법에 기반을 둔 FLUMEN 수치모형을 이용하여 홍수범람 모의를 수행하였다. 본 연구의 대상유역은 평택시 내에 있는 상수침수지역인 안성천과 통복천의 합류지점을 선정하였다. 대상유역에서 외수침수의 조건으로 범람이 되었을때와 도시유출(urban runoff)경계조건을 가미하여 내수침수로 인해 도시내 침수가 발생했을 시에 모의된 침수결과를 비교.검토하였다. 또한 도시유출로 인한 내수침수시에 도시내 배수펌프의 원활한 작동유무의 영향을 모의하였다. 모의된 결과를 살펴보면, 외수침수만을 고려하여 모의된 결과와 내수침수 조건을 가미한 모형의 결과는 도시내 침수면적과 침수심에서 확연한 차이가 나타남을 알 수 있었다. 또한 배수펌프의 유무에 따라 도시내의 침수심 부분에 있어서 많은 차이를 보임을 알 수 있었다. 본 모형의 결과는 향후 실제 지형에서의 홍수 피해를 예측하는 경우 하천 범람과 더불어 근래의 급격한 도시화에 따른 도시유출을 동시에 감안하여 그 피해를 최소화 할 수 있는 기초자료로 이용되어 질 수 있을 것으로 사료된다.

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Assessment of hydrological impact by long term land cover change using WMS HEC-1 model in Gyueongan-cheon watershed (WMS HEC-1을 이용한 경안천 유역의 경년 수문변화 분석)

  • Lee, Jun-Woo;Lim, Hyuk-Jin;Lee, Mi-Sun;Kim, Seong-Joon
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2001.10a
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    • pp.330-334
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    • 2001
  • 1. The purpose of this study is to evaluate the hydrologic impact due to temporal land cover changes of Gyueongan-cheon watershed. 2. WMS(Watershed Modeling System) HEC-1 was adopted and the required data such as DEM(Digital Elevation Model), stream network, soil map were prepared, and land cover map was made by using Landsat TM data. 3. Due to the increase of urban area and paddy field, the runoff ratio increased 5.8% during the past decade.

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Application of GWLF Model to Predict Watershed Pollutant Loadings (오염부하량 산정을 위한 GWLF 모형의 적용)

  • Jang, Jung-Seok;Lee, Nam-Ho
    • Journal of Korean Society of Rural Planning
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    • v.7 no.1 s.13
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    • pp.77-88
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    • 2001
  • In order to evaluate the applicability of GWLF model which can efficiently estimate non-point and point source pollutant loadings in rural watershed including urban district, the model was applied to an experimental watershed. The model was calibrated using observed data such as daily runoffs, sediment yields, T-N, and T-P. Simulated daily runoffs and sediment yields by the model using calibrated parameters were in food agreement with the observed data. There were difference between the simulated and observed nutrient loading which was considered resonable. The simulated results by the model showed that T-N, T-P and sediment yields were dependent on the amount of stream runoff discharge and land use. GWLF model is believed to applicable to estimate amount of pollutant loading of non-point source pollution for the water qualify control of agricultural watersheds.

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Runoff Analysis of Urban Area Using ILLUDAS Model (ILLUDAS 모형을 이용한 도시유역의 유출해석)

  • Park, Kyoung-Won;Hwang, Eui-Ho;Lee, Eul-Rae;Chae, Hyo-Sok
    • Proceedings of the Korea Water Resources Association Conference
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    • 2011.05a
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    • pp.149-149
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    • 2011
  • 기후변화에 따른 영향으로 태풍 및 집중호우가 증가하고 있으며, 산업발달과 인구의 도시집중 현상이 심화됨에 따라 도시지역의 인명 및 재산 피해가 증가되고 있는 시점이다. 도시화로 인한 불투수면적의 증가는 자연유역에 비해 도달시간이 단축되고 첨두유량을 증가시키게 된다. 또한 도시지역에서 대부분의 우수량은 관거(합류식의 경우에는 하수관거)를 통해 배제되기 때문에 관거 용량 이상의 강우에 대해서는 이를 충분히 배제하지 못하여 도시홍수 피해의 가장 큰 원인으로 작용하게 된다. 즉, 도시유역의 배수시스템 능력이 부족할 경우 큰 피해를 가져올 수 있게 된다. 따라서 이러한 특징을 갖는 지역에서는 도시유출모형을 이용한 침수예측과 이에 따른 효과적인 대책 수립이 필요하다. 본 연구에서는 이러한 도시유출모형 중 ILLUDAS 모형을 이용하여 2010년 9월 집중호우로 피해를 입은 굴포천 유역에 대해 내수침수모의를 실행하고 실측침수심도 자료와 비교하여 효과적인 피해 저감방안에 대해 연구하고자 하였다.

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Inundation Analysis by Considering Characteristics of Urban Runoff (도시유출특성을 고려한 침수 분석)

  • Lee, Jung Ho;Jo, Deok Jun;Lee, Eui Hoon;Kim, Joong Hoon
    • Proceedings of the Korea Water Resources Association Conference
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    • 2004.05b
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    • pp.870-874
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    • 2004
  • 도시지역 배수암거의 설계빈도는 호우 발생시 배수 기능을 원만히 수행하기에 부족한 경우가 많으며, 최근 발생 빈도가 높은 국지적 집중호우에 내하여 배수기능 수행이 취약한 실정이다. 특히, 저지대 역류 현상에 따른 침수피해는 도시 설계 및 관거 개량사업에 있어서 반드시 해결해야할 문제점으로 제시된다. 본 연구에서는 강우분석을 통한 도시유출특성을 고려하여 현행 배수암거의 설계빈도에 대한 통수능력을 검토하였으며, 방류하천의 계획홍수위 영향을 고려하여 암거내 역류 및 저지대 침수량을 분석하므로써 배수암거 설계빈도 채택의 적정성 및 저류시설 설치규모 검토를 위한 기준을 제시하었다.

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The Development of Inflow/Infiltration Estimation System using Urban Runoff Model (도시유출 해석 모형을 이용한 불명수 산정 시스템 개발)

  • Lee, Eui Hoon;Lee, Jung Ho;Jo, Deok Jun;Kim, Joong Hoon
    • Proceedings of the Korea Water Resources Association Conference
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    • 2004.05b
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    • pp.1295-1299
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    • 2004
  • 노후된 하수도 관망에서 발생하는 불명수(Inflow/Infiltration)량을 측정하기 위하여 수문학적 타당성을 비롯한 다양한 인자를 고려하여 많은 방법들이 개발되었다. 현행 실무에서는 물사용평가방법, 일 최대-최소 유량평가법, 일최대 유량평가법, 야간생활하수 평가법 등으로 산정하고 있으나 각 산정값들간의 차이가 매우 크면, 각 방법별 산정된 불명수의 평균값을 채택하는 현행 기준은 그 근거가 명확하지 않고 오차값이 신뢰할 수 있는 범위를 벗어난다. 본 연구에서 제안한 방법은 도시유출 해석 프로그램인 SWMM(Storm Water Management model)을 이용하여 모의유출량을 산정한 다음, 이를 관측유량과 비교하여 그 차이를 불명수량으로 산정하는 방법이다.

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Analysis of Intercepted Flow Characteristics by Accumulated Debris (부유잡목에 의한 흐름차단이 하천에 미치는 영향 분석)

  • Choi, Gye-Woon;Kim, Young-Gyu;Hwang, Young-Man;Cho, Sang-Wook
    • Proceedings of the Korea Water Resources Association Conference
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    • 2007.05a
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    • pp.846-850
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    • 2007
  • In this study debris like branch or trash are washed and flowed from land to stream by rainfall runoff at mountain or urban stream specially rainy season. These kinds of debris are accumulated at hydraulic construct on the way of flow along the stream. The shape or ratio of like these accumulated debris are various according to the location where it is accumulated and the material what it is, so that it is influenced to be varied to flow characteristics. To be simple of accumulated debris shape, it was made experiments though the variation of open ratio and the shape of accumulated debris by lab experiment using straight channel with two piers. From the result, the water level is inverse proportion to open ratio, and the water level more sensitive to the debris‘ width than length at the same area of accumulated debris.

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Rural watershed Water Quality and Environmental Improvement through Rearrangement of Irrigation Water Supply Systems (농촌유역 환경개선을 위한 용수공급체계 재정비)

  • Lee, Gwang-Ya;Kim, Hae-Do;Choe, Seon-Hwa
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2005.10a
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    • pp.515-520
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    • 2005
  • The objective of the study is to assess the water quality improvement resulted from the rearrangement of the irrigation water supply systems at Mankyeong River and Ansung Chun basin. There is a mixed type of watershed composed of urban and rural areas in the region. From the water quality analysis, showed high T-N, T-P concentration in Ansung chun and Mankyeong river caused by paddies separated widely around Ansung chun and Mankyeong river and by runoff of the pollution from the Ansung and Jeonju city. but the upstream of the river showed clean water quality, so if we use the upstream water as river maintenance water for water quality improvement, it is expected to be positive effect for rural environmental aspect.

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A Study on the Use of Bryophyte in Greening Man-made Structures (선태식물을 이용한 인공구조물 녹화가능성에 관한 연구)

  • Kim, Yong Kyu;Chang, Hea Sook;Kim, Yong
    • KIEAE Journal
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    • v.7 no.3
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    • pp.21-30
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    • 2007
  • This research focuses primarily on the feasibility of applying bryophyte to man-made structures in modern urban environment. The study is based both on the role of bryophyte known in the process of the naturalization that life has come on the land and the physiological and ecological characteristics of bryophyte. The primary characteristics of this species lie in its desiccation-tolerance and poikilohydry that supports its enduring survival even under the desperate environmental conditions. The monitoring of applying bryophyte to man-made structures has shown us that bryophyte could control microclimate conditions, help to mitigate flood by reducing runoff, and lessen thermal conductivity, etc. The application of bryophyte to man-made structures has just started since 2002. Even though efforts to use bryophyte in greening man-made structures in Japan and Korea have resulted in both successes and failures, it is noticeable that there has been quite much technical progress in using this unique plant species.

Quantifying Inundation Analysis in Misari motorboat racing stadium using MOUSE (MOUSE를 활용한 미사리 조정경기장의 정량적 침수해석)

  • Hwang, Hwan-Kook;Han, Sang-Jong;Chong, Yon-Kyu
    • Journal of Korean Society of Water and Wastewater
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    • v.24 no.5
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    • pp.549-560
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    • 2010
  • Recently, heavy rainfalls due to the climate change in Korea have caused inundation problems in urban sewer networks. In july 2006, a flooding accident at Misari motorboat racing stadium near the Han river occurred due to the effect of record-breaking outflow discharge from Paldang-dam. The purpose of this study was to simulate and analyze the flooding accident at Misari stadium by MOUSE model. The results of simulation analysis indicated that the total flood volume was $1,313,450m^3$. The effect of back water was 85.9% of the total volume which was caused by the manhole accident, and the effect of accumulated runoff was 14.1% of total volume which was caused by non-return valve shutdown. The simulation results of this MOUSE modeling that was linked to the boundary condition of the dynamic flows in the river by DWOPER model showed the potential of successful inundation analysis for sewer networks.