• 한국환경과학회지
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• 제13권1호
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• pp.19-26
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• 2004

The purpose of the study was to construct a forecast system of flood inundation area at natural stream channels. The study built the system to interpret the flood inundation area in four stages ; constructing topography data around the stream channel, interpreting flood discharge, interpreting flood elevation in the stream channel, and interpreting the flood inundation and mapping. According to the result of the analysis, as for the characteristic of flood inundation around the area within the purview of this study, although there were areas where flood inundation over a bank caused a flooded area, the failure of the internal drainage in the ground lower than flood elevation caused more serious problems. Rather than the existing method where only the estimated flood elevation data is used based on the hydrographical stream channel trace model(such as the HEC-RAS model) to establish the flood inundation area, if the procedure introduced in this study was applied to interpret the floodplain, actual flood inundation area could be visibly confirmed.

• 한국농공학회논문집
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• 제66권1호
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• pp.49-66
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• 2024

Extreme rainfall will become intense due to climate change, increasing inundation risk to agricultural land. Hydrological and hydraulic simulations for the entire watershed were conducted to analyze the impact of climate change. Rainfall data was collected based on past weather observation and SSP (Shared Socio-economic Pathway)5-8.5 climate change scenarios. Simulation for flood volume, reservoir operation, river level, and inundation of agricultural land was conducted through K-HAS (KRC Hydraulics & Hydrology Analysis System) and HEC-RAS (Hydrologic Engineering Center - River Analysis System). Various scenarios were selected, encompassing different periods of rainfall data, including the observed period (1973-2022), near-term future (2021-2050), mid-term future (2051-2080), and long-term future (2081-2100), in addition to probabilistic precipitation events with return periods of 20 years and 100 years. The inundation area of the Aho-Buin district was visualized through GIS (Geographic Information System) based on the results of the flooding analysis. The probabilistic precipitation of climate change scenarios was calculated higher than that of past observations, which affected the increase in reservoir inflow, river level, inundation time, and inundation area. The inundation area and inundation time were higher in the 100-year frequency. Inundation risk was high in the order of long-term future, near-term future, mid-term future, and observed period. It was also shown that the Aho and Buin districts were vulnerable to inundation. These results are expected to be used as fundamental data for assessing the risk of flooding for agricultural land and downstream watersheds under climate change, guiding drainage improvement projects, and making flood risk maps.

• 한국수자원학회논문집
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• 제31권4호
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• pp.415-427
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• 1998

DWOPER 모형에 제방월류 및 붕괴에 따른 홍수해석, 제내지에서의 범람 해석등을 처리할 수 있도록 프로그램을 대폭적으로 개선, 보강한 모형을 개발하여 Arc/Info와 연계하여 처리할 수 있는 홍수범람해석시스템 FIAS(Flood Inundation Analysis System)를 구축하여 이를 남한강의 제방월류 및 붕괴에 대해서 적용하였다. 본 모형을 1995년 8월 23~27일에 남한강의 제방의 월류로 인해 발생한 범람홍수에 대해 적용하였다. 홍수파 해석에 의한 하천의 하도부에서의 수위와 제내지의 수위를 비교하여 하천제방의 월류로 인한 범람유량을 산정하였다. Arc/Info의 AML 을 이용한 GUT를 개발하여 2차원과 3차원 홍수범람도를 도시하였다. 본 연구모형으로부터 계산된 범람수위와 범람면적은 실제 현지 조사자료와도 잘 일치하는 것으로 나타났다.

• 농업과학연구
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• 제47권3호
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• pp.509-517
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• 2020

Geographic information system (GIS) sewer network data are a fundamental input material for urban inundation modeling, which is important to reduce the increasing damages from urban inundation due to climate change. However, the essential attributes of the data built by a local government are often missing because the purpose of building the data is the maintenance of the sewer system. Inconsistent simplification and supplementation of the sewer network data made by individual researchers may increase the uncertainty of flood simulations and influence the inundation analysis results. Therefore, it is necessary to develop a basic algorithm to convert the GIS-based sewage network data into input data that can be used for inundation simulations in consistent way. In this study, the format of GIS-based sewer network data for a watershed near the Sadang Station in Seoul and the Oncheon River Basin in Busan was investigated, and a missing data supplementing algorithm was developed. The missing data such as diameter, location, elevation of pipes and manholes were assumed following a consistent rule, which was developed referring to government documents, previous studies, and average data. The developed algorithm will contribute to minimizing the uncertainty of sewer network data in an urban inundation analysis by excluding the subjective judgment of individual researchers.

• 대한토목학회논문집
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• 제26권4B호
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• pp.379-387
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• 2006

본 연구의 목적은 Dual-Drainage 개념에 의한 도시침수해석모형을 개발함에 있으며, 이를 위해 도시지역 배수시스템 해석 모형으로 널리 이용되고 있는 SWMM모형과 월류유량의 전파과정을 계산하는 DEM기반 침수해석모형을 통합하였다. 배수시스템 해석 모형인 SWMM모형의 계산결과를 이용하여 침수해석을 수행하는 연계모형의 경우 월류지점으로부터의 침수진행 과정을 잘 모의할 수 있으나, 월류발생이 끝난 시간에도 지형상의 영향으로 인하여 일부 침수유량이 일부지점에 계속 침수된 채 있는 등 지표침수유량의 배수과정을 제대로 모의하지 못할 수 있다. 이를 해결하기 위해서는 침수지역에 대한 지표류 홍수 추적시 일부 침수유량이 과부하가 발생하지 않는 유입구 지점을 통과함 때 다시 배수시스템으로 유입되는 것을 고려하여 재유입되는 양을 산정하고 유입된 유량은 배수시스템 내의 흐름에 반영되도록 배수시스템과 침수해석모형을 통합한 새로운 모형을 개발하였다, 본 모형을 이용하여 침수상황의 시간별 진행과정을 분석함으로써 도시홍수에 대한 침수위험지점 파악 및 주민대피지도 구축 등에 활용될 수 있을 것으로 판단된다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.111-123
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• 2004

Recently, though damage caused by intensive rainfall and typhoon happens frequently, we could not forecast or predict a disaster, due to the difficulty of obtaining exact information about it. For efficient disaster management, the most urgent need is the preparation of a flood forecast-warning system. Therefore, we need to provide a program that has the ability of inundation analysis and flood forecast-warning using a geographic information system, and using domestic technology rather than that from foreign countries. In this research, we constructed a FDMS(Flood Disaster Management System) that is able to analyze real-time inundation data, and usins the GIS(Ceographic Information System) with prompt analyzing of hydrologic-topographical parameters and runoff-computation. Moreover, by expressing inundation analysis in three-dimensions, we were able to get to the inundation area with ease. Finally, we expect that the application of this method in the (food forecast-warning system will have great role in reducing casualties and damage.

• Spatial Information Research
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• 제11권2호
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• pp.155-170
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• 2003

GIS를 이용한 홍수침수 분석시스템이 공항배수유역의 침수현상을 모의하기 위해 개발되었다. 본 연구에서 개발된 모형은 사용자 인터페이스인 GUI 시스템을 통한 Database 구축 및 입력자료 작성을 위한 전처리 과정과 주처리 해석모형을 통해 계산된 결과를 그래픽으로 처리하는 후처리 과정을 GIS(ArcView/Avenue)와 연계하여 통합적으로 구축·제시되었다. 주처리 해석모형은 노면수의 거동분석 모형과 하수배수체계의 분석모형을 통합하여 상호 연계 현상을 모의함으로써 유역에서의 유출량과 배수시스템과의 실제적인 거동을 해석하여 배수관로의 배수효과 및 압력류에 의한 침수현상을 모의함으로써 배수관로 유입에 따른 실제적인 현상을 모의하였다. 본 연구에서 개발된 홍수침수분석시스템은 향후 공항에서의 침수피해에 대한 시설전반에 대해 합리적인 대책관리방안 및 시설개선방안 수립을 위한 체계적인 의사결정에 크게 기여할 것으로 사료된다.

• 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.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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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.

• Korean Journal of Hydrosciences
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• 제10권
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• pp.59-72
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• 1999

FIAS(Flood Inundation Analysis System) using Arc/Info is developed and applied to the Namhan River basin. The DWOPER model is revised and expanded to handle simultaneous multiple overtopping and/or breaking, and to estimate the inundated depth and extents. The model is applied to an actual levee overtopping case, which occurred on August 23∼27, 1995 in the Namhan River. Stage hydrographs inside and outside of the levee are compared, then inundated discharges from overbank spilling are computed. The Graphic User interface is developed with AML. Two- and three-dimensional inundation map by Arc/Info are presented. The computed inundation extends agree with observations in terms of inundated depth and flooded area. The FIAS is useful for the analysis of flood hazards and preparation of inundation map for river basins.