• Journal of Wetlands Research
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• v.16 no.3
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• pp.383-392
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• 2014

The purpose of this study is to simulate inundation and evaluate the applicability of LISFLOOD model to the streams in South Korea by comparing with the inundation map using FLUMEN. The suggested levee breaching scenarios were applied to the LISFLOOD model, and the results obtained from scenarios were evaluated. The modeling results using LISFLOOD by appling the levee breaching scenarios showed 0.2% ~ 42% relative error with FLUMEN model in inundation area. But the relative error of maximum inundation area by overlapping all the flood analysis results from levee breaching scenarios such as the way making flood risk map was approximately 1.2% between two models. Meanwhile, LISFLOOD model was easy to construct input data, DEM as topographic data and discharge hydrograph as upper boundary conditions. And computing time of LISFLOOD was shorter than FLUMEN. Therefore LISFLOOD model can be applied usefully in the region that needs immediate inundation modeling.

• Journal of Korea Water Resources Association
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• v.38 no.5 s.154
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• pp.355-364
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• 2005

In this study, flood inundations have been simulated by using the numerical model FLUMEN solving the shallow-water equations with a finite volume method. Before applying to a real problem, the numerical model is first applied to simplified problems. Obtained numerical results are verified by comparing with available analytical solutions and laboratory measurements. Reasonable agreements are observed. The model is then applied to a simulation of flood events with real geometries. The results of this study will provide basic information to make a flood inundation map.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.1376-1380
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• 2004

본 연구에서는 홍수범람지도 제작을 위해 사용되는 수치모형의 검증을 수행하고자 한다. 검증할 수치모형은 스위스의 Beffa에 의해 개발된 FLUMEN(FLUvial Modeling ENgine)으로서 수심 적분된 2차원 비선형 천수방정식에 불규칙 심각망을 이용한 유한체적법(finite volume method)이 적용된 수치모형이며 스위스, 독일, 오스트리아 등에서 홍수범람해석에 사용된 바 있는 모델이다. FLUMEN 모형의 검증을 위하여 범람해석시 가장 중요한 문제인 이동경계조건(moving boundary condition)을 포함하고 있는 원형섬에서의 고립파에 처오름높이를 계산하여 수리모형실험 결과와 비교한다. 수리모형실험은 미국 육군 공병단 산하의 해안공학연구소(CERC, Coastal Engineering Research Center)에서 수행되었으며(Liu 등, 1995) 수조의 중앙에 높이 0.625m, 해저지름 7.2m, 경사각 $14.04^{\circ}$의 원형섬이 위치한다. 본 연구 결과, 수치해석으로 계산된 섬에서의 실제 처오름높이와 입사파의 파고의 비(R/A)는 수리모형실험의 결과와 어느 정도 일치하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.317-321
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• 2017

본 연구는 황구지천 인접 지역의 홍수지도를 작성하기 위하여 황구지천 제방 파제시 홍수범람 모의를 실행하였다. 홍수범람모의에 적용한 수치모형은 FLUMEN이며 황구지천 세마교부터 수직교 구간 인접지역의 홍수범람을 모의하였다. 수치지형도에 의한 지형자료와 함께 조도계수 및 홍수수문곡선운 황구지천 관련 계획보고서의 자료를 인용하였다. 월류에 의한 범람 양상을 파악하기 위하여 확률홍수시 현 제방고를 적용한 초기 침수 빈도를 적용하였다. 범람시나리오를 작성하기 위하여 2개의 파제위치를 선정한 후 범람 모의를 수행하였다. FLUMEN은 미리 제방을 파제한 후 처오름 해석으로 모의하는 방법과 하도에 물이 가득 찬 후 제방을 파괴하는 방법이 있으며 본 연구에서는 전자의 방법을 적용하였다. 제방의 범람에 따른 침수시간, 유속분포의 변화, 침수심, 침수면적 등을 산정하고 제방의 파제에 따른 침수시 파제폭에 관한 변화를 주어 범람면적의 변화 및 시간의 변화 수문곡선상 문제점을 검토하여 해당지점의 적정한 파제폭, 침수심, 침수시간 등을 제시하여 홍수지도 작성시 필요한 자료를 제시하였다.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.5
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• pp.149-158
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• 2010

Recent rainfall patterns in Korea show that both of the total amount of rainfall and the total number of heavy rain days have been increased. Therefore, the damage resulted from flood disaster has been dramatically increased in Korea. The purpose of the present study is to analyze flooding in an urban area using SWMM linked with FLUMEN. The study area is Suyeong-Mangmi lowland area, Busan, Korea. Suyeong-Mangmi lowland area have been a flooding hazard zone since 1995. The last flooding cases of this area occurred on July 7th and 16th, 2009, and the later flooding case was analyzed in this study. The first step of computation is calculating flow through storm sewers using the urban runoff simulation model of SWMM. The flooding hydrographs are used in the inundation analysis model of FLUMEN. The results of inundation analysis were compared with the real flooding situation of the study area. The real maximum inundation depth was guessed by 1.0 m or more on July 16th. The computation yields the maximum inundation depth of 1.2 m and the result was somewhat overestimated. The errors may be resulted from the runoff simulation and incapability of simulation using FLUMEN for flow into buildings. The models and procedures used in this study can be applied to analysis of flooding resulted from severe rainfall and insufficiency of drainage capacity.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.815-819
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• 2007

최근 기록적인 집중호우와 태풍으로 인해 홍수의 피해가 점점 증가하고 있다. FLUMEN과 같은 홍수범람 해석 모형을 이용한 비구조적인 홍수대책들은 홍수 피해를 확실히 경감시켜줄 수 있다. 본 연구에서는 FLUMEN 모형의 적용성을 검토하여 홍수피해 저감방안을 제시하였다. 천수방정식을 지배방정식으로 하고 유한체적법에 기반을 둔 이 모형을 대상유역으로 진위천 구간을 선정하여 적용하였다. 1998년 8월 7일${\sim}$9일에 발생했던 실제 강우사상으로 적용성을 검토하였으며, 침수실적도와 모의범람면적을 비교하였을 때 미미한 차이를 보였다. 적용성 검증 후, 빈도별 홍수범람 모의를 실시하였으며, 200년 빈도의 홍수량에 대하여 2가지 경감대책(제방의 보축, 상류 유입부 천변저류지)에 대하여 범람모의 하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.1174-1178
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• 2005

In this study, flood inundations have been simulated by using the numerical model FLUMEN solving the shallow-water equations with a finite volume method. Before applying to a real problem, the numerical model is first applied to simplified problems. Obtained numerical results are verified by comparing to available analytical solutions and laboratory measurements. Reasonable agreements are observed. The model is then applied to a simulation of flood events with real geometries. The results of the present study provide basic informations for a flood inundation map.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.396-396
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• 2015

Frequent urban floods affect the human safety and economic properties due to a lack of the capacity of drainage system and the increased frequency of torrential rainfall. The drainage system has played an important role in flooding control, so it is necessary to establish the effective countermeasures considering the connection between drainage system and surface flow. To consider the connection, we selected SWMM5 model for analyzing transportation capacity of drainage system and FLUMEN model for calculating inundation depth and time variation of inundation area. First, Thiessen method is used to delineate the sub-catchments effectively base on drainage network data in SWMM5. Then, the output data of SWMM5, hydrograph of each manhole, were used to simulate FLUMEN to obtain inundation depth and time variation of inundation area. The proposed method is applied to Sadang area for the event occurred in $27^{th}$ of July, 2011. A total of 11 manholes, we could check the overflow from the manholes during that event as a result of the SWMM5 simulation. After that, FLUMEN was utilized to simulate overland flow using the overflow discharge to calculate inundation depth and area on ground surface. The simulated results showed reasonable agreements with observed data. Through the simulations, we confirmed that the main reason of the inundation was the insufficient transportation capacities of drainage system. Therefore cooperation of both models can be used for not only estimating inundation damages in urban areas but also for providing the theoretical supports of the urban network reconstruction. As a future works, it is recommended to decide optimized pipe diameters for efficient urban inundation simulations.

• Journal of the Korean Association of Geographic Information Studies
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• v.12 no.3
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• pp.88-100
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• 2009

An inundation analysis was performed on Hwapocheon, one of the tributaries of Nakdong River, which was inundated by heavy rain in August, 2002 with overtopping and levee break. The results of the developed model, 2D diffusion wave inundation analysis model, was compared with inundation trace map as well as inundation depth in terms of time and maximum inundated area calculated from FLUMEN model for the assessment of model applicability. The results from the developed model showed high fitness of 88.61% in comparison with observed data. Also maximum inundated area and spatial distribution of inundation zone were also found to be consistent with the results of FLUMEN model. Therefore, inundation zone and maximum inundation area calculated over a period of time by adopting 2D diffusion wave inundation analysis model can be used as a database for identifying high risk areas of inundation and establishing flood damage reduction measures.

• Journal of Korean Society for Geospatial Information Science
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• v.25 no.2
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• pp.49-56
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• 2017

In this study, flood analysis was conducted to prepare for damage caused by typhoons and heavy rain due to abnormal climate and climate change. Two - dimensional flooding analysis using the FLUMEN model, which is widely used for national and international flood risk mapping, was conducted for the Nam River Basin, which is the tributary of the Nakdong River. This study divides the topography into $5m{\times}5m$ DEM by ArcView, so that the accuracy of river repair and hydrological characterization and flood area identification can be maximized. As a result of simulation of water flooding, 163.3ha in section 1, 227.7ha in section 2 and 59.9ha in section 3 were simulated.