• 대기
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• 제27권2호
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• pp.189-197
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• 2017

Progressing from weather forecasts and warnings to multi-hazard impact-based forecast and warning services represents a paradigm shift in service delivery. Urban flooding is a typical meteorological disaster. This study proposes support plan for urban flooding impact-based forecast by providing inundation risk matrix. To achieve this goal, we first configured storm sewer management model (SWMM) to analyze 1D pipe networks and then grid based inundation analysis model (GIAM) to analyze 2D inundation depth over the Gangnam drainage area with $7.4km^2$. The accuracy of the simulated inundation results for heavy rainfall in 2010 and 2011 are 0.61 and 0.57 in POD index, respectively. 20 inundation scenarios responding on rainfall scenarios with 10~200 mm interval are produced for 60 and 120 minutes of rainfall duration. When the inundation damage thresholds are defined as pre-occurrence stage, occurrence stage to $0.01km^2$, 0.01 to $0.1km^2$, and $0.1km^2$ or more in area with a depth of 0.5 m or more, rainfall thresholds responding on each inundation damage threshold results in: 0 to 20 mm, 20 to 50 mm, 50 to 80 mm, and 80 mm or more in the rainfall duration 60 minutes and 0 to 30 mm, 30 to 70 mm, 70 to 110 mm, and 110 mm or more in the rainfall duration 120 minutes. Rainfall thresholds as a trigger of urban inundation damage can be used to form an inundation risk matrix. It is expected to be used for urban flood impact forecasting.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.179-179
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• 2015

Citarum River is one of the important river in West Java, Indonesia. During the rainy season, flood happens almost every year in Upper Citarum Watershed, hence, it is necessary to establish the countermeasure in order to prevent and mitigate flood damages. Since the lack of hydrological data for the modelling is common problem in this area, it is difficult to prepare the countermeasures. Therefore, we used Rainfall-Runoff-Inundation (RRI) Model developed by Sayama et al. (2010) as the hydrological and inundation modelling for evaluating the inundation case happened in Upper Citarum Watershed, West Java, Indonesia and the satellite based information such as rainfall (GSMaP), landuse and so on instead of the limited hydrological data. In addition, 3 arc-second HydroSHEDS Digital Elevation Model (DEM) is used. To verify the model, the observed data of Nanjung water stage gauging station and the daily observation data are used. Simulated inundation areas are compared with the flood extent figure from Upper Citarum Basin Flood Management Project (UCBFM).

• 한국방재학회 논문집
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• 제10권6호
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• pp.155-163
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• 2010

범람해석에 관한 기존의 연구들은 높은 정확도의 범람해석결과를 얻기 위해 비정방형격자를 이용한 다양한 수치기법들을 제시하고, 고정확도의 해석결과를 보여주고 있으나 실시간 범람해석에 적용하기 위해서는 전처리 과정의 간소화 및 모의 시간 단축이 필요하다. 또한 최근 들어 침수지도, 홍수위험 지표 및 다차원 홍수피해 산정기법을 이용한 홍수위험 지도 작성을 위해서는 다양한 vector 및 raster기반의 정보와의 연계해석이 필요하며 이를 위해서는 비정방형격자보다는 정방형격자기반의 홍수범람 해석기법이 효율적이다. 본 연구에서는 지형데이터의 전처리 과정을 간략화하고, 모의수행시간을 단축할 수 있도록 raster기반의 2차원 홍수범람 모형을 개발하였으며, 개발된 모형의 정확도 및 효율성 평가를 위해 2002년 8월 10일 발생한 백산제 붕괴 홍수범람 모의에 적용하여 실측자료 및 상용 2차원 수치모형인 FLUMEN과의 모의결과를 비교 분석하였다. 개발된 모형의 최대 침수면적은 실제침수흔적도 및 FLUMEN 모의결과와 상당히 유사한 결과를 보였으며, 범람해석모형에 포함된 하도-제내지 연결부 모형에 의해 제방붕괴초기의 하도에서 제내지의 범람유량뿐만 아니라 제방붕괴후기의 제내지에서 하도로의 역유입 현상 역시 상당히 우수하게 모의되었다.

• 한국수자원학회논문집
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• 제40권3호
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• pp.223-236
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• 2007

e o최근에 들어 도시지역에서는 국지성 집중호우에 의한 홍수피해가 증가하고 있다. 심지어 우수설비 시스템이 비교적 잘 갖추어진 개발 지역에서도 기존의 우수설비시스템의 용량이 초과되어 큰 침수피해가 발생하고 있다. 이로 인해 건물， 공공기반시설 등 재산 및 인명 등에 있어 많은 피해를 야기하고 있으며, 도로의 침수는 운송 시스템의 기능에 문제를 일으키게 되어 도시의 산업과 기능을 마비시킨다. 이러한 도시지역 홍수에 대비하여 도시지역의 복잡한 지형 형상과 인위적 배수시스템을 함께 고려하여 해석할 수 있는 적절한 침수해석모형이 필요하다. 본 연구에서는 배수시스템 해석 모형인 SWMM모형과 도시침수해석 모형인 DEM 기반 침수해석모형을 통합하고, 두 모형간의 유량의 전송과정을 수리학적 관계를 고려한 이중 배수(Dual-Drainage) 개념에 의한 도시침수해석모형을 이용하였다. 본 연구에서는 이중배수 침수해석모형을 수정하여 건물의 영향을 고려할 수 있도록 구성하였다. 본 모형의 개발로 침수상황의 시간별 진행과정을 분석함으로써 도시홍수에 대한 침수위험지점 파악 및 홍수 취약지점에서의 긴급대피 계획수립 등에 활용될 수 있을 것으로 판단된다.

• 한국조경학회지
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• 제33권2호
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• pp.71-82
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• 2005

A large scale of riverside rearrangement has been recently done in the major rivers in Korea. So inundation possibility in agricultural area closed by these rivers has been higher than the possibility a few years ago. However, land use in this area has not been adjusted to a change of this situation near the rivers. Therefore, when typhoon or heavy rain is happened on this area, it can cause a large damage in agricultural area. This study analyzed inundation potentiality in agricultural area at Ibang-myeon, Changnyeong-gun, Kyeongnam-province, Korea by using the logistic regression model and the piecewise regression model. The first thing we did was to transfer the inundation area per elevation to the accumulated inundation area per elevation. This accumulated inundation area per elevation as an distribution function could be described by the logistic regression model(LRM), and piecewise regression model(PRM) could make it much more accurate to analyze the inundation area per elevation. As a result, the regression models derived from LRM and PRM showed $R^2$ over 0.950. The models derived from LRM and PRM in Ibang-myeon noted that frequently inundated area(FIA) was shown up to 12.12m in elevation, and potentially inundated area(PIA) was shown up to 14.60m in elevation. In FIA, regular agricultural activity would be impossible. And It would be not easy to continue the regular agricultural activity in PIA. So, this land should be rearranged to be used for a buffer zone for ecosystem protection, landscape conservation and things like that in riverside.

• 농업과학연구
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• 제48권3호
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• pp.515-526
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• 2021

The frequency of typhoons and torrential rainfalls has increased due to climate change, and the concurrent risk of breakage of dams and reservoirs has increased due to structural aging. To cope with the risk of dam breakage, a more accurate emergency action plan (EAP) must be established, and more advanced technology must be developed for the prediction of flooding. Hence, the present study proposes a method for establishing a more effective EAP by performing flood and inundation analyses using one- and two-dimensional models. The probable maximum flood (PMF) under the condition of probable maximum precipitation (PMP) was calculated for the target area, namely the Gyeong-cheon reservoir watershed. The breakage scenario of the Gyeong-cheon reservoir was then built up, and breakage simulations were conducted using the dam-break flood forecasting (DAMBRK) model. The results of the outflow analysis at the main locations were used as the basis for the one-dimensional (1D) and two-dimensional (2D) flood inundation analyses using the watershed modeling system (WMS) and the FLUvial Modeling ENgine (FLUMEN), respectively. The maximum inundation area between the Daehari-cheon confluence and the Naeseong-cheon location was compared for each model. The 1D flood inundation analysis gave an area of 21.3 km², and the 2D flood inundation analysis gave an area of 21.9 km². Although these results indicate an insignificant difference of 0.6 km² in the inundation area between the two models, it should be noted that one of the main locations (namely, the Yonggung-myeon Administrative and Welfare Center) was not inundated in the 1D (WMS) model but inundated in the 2D (FLUMEN) model.

• 대한토목학회논문집
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• 제36권3호
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• pp.395-406
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• 2016

도시화로 인한 인구집중 및 개발 집중현상으로 하천변 저지대 및 지하공간 사용이 증가하였고, 불투수층이 증가하여 도시유역의 배수체계는 우수관거에 의존하고 있다. 이러한 변화로 인한 우수관거의 저류용량 부족 및 외수위의 영향으로 인한 도심지 역류 현상으로 인한 침수피해가 발생하고 있다. 하지만 기존의 홍수범람에 관한 연구는 대부분 외수범람과 내수침수를 유기적으로 연결하지 못하고 있다. 본 연구에서는 상습침수가 발생하는 도시유역에 대하여 도시유역 유출특성을 고려한 홍수의 정확한 예측을 위해 강우분석 및 외수위를 고려하고, 도시유출모형인 SWMM 모형을 이용하여 하수관거의 월류를 분석하였고, 이 결과를 홍수범람해석 모형과 연계하여 도시유역에서의 집중호우 발생시 침수해석을 실시하여 수방시설물의 홍수배제 효율을 분석하였다. SWMM 모형의 적용결과 외수위영향에 따른 원활한 내수배제가 불가능 한 것으로 나타났고, 관거 월류량이 많아진 것으로 나타났다. 월류된 우수가 지면을 따라 흐를 경우 저지대의 침수가 예상되고, 월류량이 많은 맨홀을 주요맨홀로 선정하였고, 월류수 저감을 위한 방안으로 주요 맨홀의 인근 지역에 저류지를 설치하는 방안과 각 맨홀들을 연결하는 관거를 확대하는 방안을 설정하였다. 월류 저감 시나리오 적용 결과 저류지 설치시 월류량의 45%, 관거 확대시 33~64%의 저감효과를 보였다. SWMM 모형의 결과를 이용하여 홍수범람해석 모형을 모의한 결과 지표경사와 도로를 따라 맨홀 월류수가 모여 침수현상을 발생시키는 것으로 나타났으며, 관거 확대 적용시 침수면적이 19.6%, 60.5% 줄어든 것으로 나타났다.

• 상하수도학회지
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• 제24권5호
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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.

• Water Engineering Research
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• 제2권2호
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• pp.75-87
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• 2001

A new moving boundary technique for leap-frog finite difference numerical mode is proposed for the resonable simulation of coastal inundation over discontinuous topography. The new scheme improves the moving boundary technique developed by Imamura(1996). The present scheme is tested using the analytical solution of Thacker(1981) for the case of free oscillation with moving boundary in a parabolic bowl. Finally, a numerical simulation is conducted for the flooding over a tidal barrier constructed on a simple concave geometry. A general feature of inundation over a discontinuous topography is well described by the numerical model.

• 상하수도학회지
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• 제23권6호
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• pp.711-717
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• 2009

In this study, SWMM model is used to reproduce the main storm sewer system located in the Nae-Hang drainage basin of the Mokpo city and keep track of flood discharge. Given the outlet of the reaches border the coastline, this paper has taken the dual-drainage approach to perform inundation simulation, considering both the overflows and inflows at the manholes of the sewer system, and at the same time, taking the impacts of tidal stage into consideration. The following conclusions are reached in this study: First, when planning lowland sewer system alongside the coastline or the riverside, the tidal stage or flood stage need to be considered in the planning and design processes. Second, an analysis that fails to consider overflow and inundation at the manholes may overestimate inundation depth of the flooded area. In other words, in order to estimate flood discharge and flood stage in a lowland storm sewer system, it is desirable to analyze the conveyance capacity of storm sewer system and simulate overflow and inundation at the manholes at the same time.