• 제목/요약/키워드: Inundation analysis model

검색결과 217건 처리시간 0.033초

시나리오 기반 홍수위험정보지원시스템 구축 방안 연구 (Study on Construction of Flood Hazard Information Support System based on Scenario)

  • 구신회;진경혁;정태성
    • 한국측량학회:학술대회논문집
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    • 한국측량학회 2010년 춘계학술발표회 논문집
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    • pp.389-393
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    • 2010
  • The Objective of this study was to develop a system for visualizing inundation area by using 1-D numerical model analyzing damage information such as inundation area, facilities, land usages, population, building, loads. In this study, we have reviewed hydraulic models to select a flood model for simulation of discharges, water depths and velocities. The study area is Namhan River from Youngwol to Paldang Dam which had a flood damage on upper and below regions of Chungju Dam by a storm event in 2006. At the first, we developed the DB system base on GIS thematic map, ortho images, cadastral maps to analyze flood damages and support decisions making. Changing the boundary conditions such as discharge at the gauging stations, flood simulations were performed and then damages were extracted from the databases information support system based on 1-D numerical hydraulic model, it is expected to be able to analyze flood damages and support a decision making for reduce flood relate damages. In the future, the system developed in this study could be applied for flood forecasting system of small scaled streams.

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Application of adaptive mesh refinement technique on digital surface model-based urban flood simulation

  • Dasallas, Lea;An, Hyunuk
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2020년도 학술발표회
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    • pp.122-122
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    • 2020
  • Urban flood simulation plays a vital role in national flood early warning, prevention and mitigation. In recent studies on 2-dimensional flood modeling, the integrated run-off inundation model is gaining grounds due to its ability to perform in greater computational efficiency. The adaptive quadtree shallow water numerical technique used in this model implements the adaptive mesh refinement (AMR) in this simulation, a procedure in which the grid resolution is refined automatically following the flood flow. The method discounts the necessity to create a whole domain mesh over a complex catchment area, which is one of the most time-consuming steps in flood simulation. This research applies the dynamic grid refinement method in simulating the recent extreme flood events in Metro Manila, Philippines. The rainfall events utilized were during Typhoon Ketsana 2009, and Southwest monsoon surges in 2012 and 2013. In order to much more visualize the urban flooding that incorporates the flow within buildings and high-elevation areas, Digital Surface Model (DSM) resolution of 5m was used in representing the ground elevation. Results were calibrated through the flood point validation data and compared to the present flood hazard maps used for policy making by the national government agency. The accuracy and efficiency of the method provides a strong front in making it commendable to use for early warning and flood inundation analysis for future similar flood events.

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Analysis of Flooding Discharge in Seoul-Metropolitan Area based on Return Periods

  • Ang Peng;Seong Cheol Shin;Quan Feng;Junhyeong Lee;Soojun Kim;Hung Soo Kim
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2023년도 학술발표회
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    • pp.349-349
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    • 2023
  • In recent years, urban floods have become more frequent, causing significant harm to society and resulting in substantial losses to the national economy and people's lives and property. To assess the impact of floods on people's safety and property in Seoul, annual precipitation data from 1980 to 2020 was analyzed for return periods of 5, 10, 20, 50, and 100 years. A rainfall runoff simulation model for Seoul was established using HEC-HMS and HEC-RAS models. The study revealed that at a 5-year return period, water began to accumulate in Seoul, but it was not severe. However, at a 10-year return period, the water accumulation was relatively serious, and inundation began to occur. At a 20-year return period, there was serious water accumulation and inundation in Seoul. During a 50-year return period, Seoul suffered from severe inundation in commercial areas, resulting in substantial losses to the local economy. The findings indicate that Seoul City faces high flood risks, and measures should be taken to mitigate the impact of floods on the city's residents and economy.

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Safety analysis of nuclear containment vessels subjected to strong earthquakes and subsequent tsunamis

  • Lin, Feng;Li, Hongzhi
    • Nuclear Engineering and Technology
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    • 제49권5호
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    • pp.1079-1089
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    • 2017
  • Nuclear power plants under expansion and under construction in China are mostly located in coastal areas, which means they are at risk of suffering strong earthquakes and subsequent tsunamis. This paper presents a safety analysis for a new reinforced concrete containment vessel in such events. A finite element method-based model was built, verified, and first used to understand the seismic performance of the containment vessel under earthquakes with increased intensities. Then, the model was used to assess the safety performance of the containment vessel subject to an earthquake with peak ground acceleration (PGA) of 0.56g and subsequent tsunamis with increased inundation depths, similar to the 2011 Great East earthquake and tsunami in Japan. Results indicated that the containment vessel reached Limit State I (concrete cracking) and Limit State II (concrete crushing) when the PGAs were in a range of 0.8-1.1g and 1.2-1.7g, respectively. The containment vessel reached Limit State I with a tsunami inundation depth of 10 m after suffering an earthquake with a PGA of 0.56g. A site-specific hazard assessment was conducted to consider the likelihood of tsunami sources.

농업용 소규모 저수지의 붕괴에 따른 하류부 피해예측 모델링 (Modeling Downstream Flood Damage Prediction Followed by Dam-Break of Small Agricultural Reservoir)

  • 박종윤;조형경;정인균;정관수;이주헌;강부식;윤창진;김성준
    • 한국농공학회논문집
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    • 제52권6호
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    • pp.63-73
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    • 2010
  • This study is to develop a downstream flood damage prediction model for efficient confrontation in case of extreme and flash flood by future probable small agricultural dam break situation. For a Changri reservoir (0.419 million $m^3$) located in Yongin city of Gyeonggi province, a dam break scenario was prepared. With the probable maximum flood (PMF) condition calculated from the probable maximum precipitation (PMP), the flood condition by dam break was generated by using the HEC-HMS (Hydrologic Engineering Center - Hydrologic Modeling System) model. The flood propagation to the 1.12 km section of Hwagok downstream was simulated using HEC-RAS (Hydrologic Engineering Center - River Analysis System) model. The flood damaged areas were generated by overtopping from the levees and the boundaries were extracted for flood damage prediction, and the degree of flood damage was evaluated using IDEM (Inundation Damage Estimation Method) by modifying MD-FDA (Multi-Dimensional Flood Damage Analysis) and regression analysis simple method. The result of flood analysis by dam-break was predicted to occurred flood depth of 0.4m in interior floodplain by overtopping under PMF scenario, and maximum flood depth was predicted up to 1.1 m. Moreover, for the downstream of the Changri reservoir, the total amount of the maximum flood damage by dam-break was calculated nearly 1.2 billion won by IDEM.

병렬 FEM 모형을 이용한 1983년 동해 중부 지진해일 시뮬레이션 (Simulation of 1983 Central East Sea Tsunami by Parallel FEM Model)

  • 최병호;에핌페리놉스키;홍성진
    • 한국해안해양공학회지
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    • 제18권1호
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    • pp.21-34
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    • 2006
  • 지진해일 위험재해도의 작성과 재해경감대책 수립을 위해서는 연안역의 상세한 수심 및 지형을 이용한 범람 시뮬레이션이 요구되고 있다. 본 연구에서는 Beowulf 병렬계산을 통해 동해 전 영역에서 정밀산정이 가능한 병렬유한요소모형을 이용하여 1983년 5월 26일 동해안에 내습한 지진해일에 대한 시뮬레이션을 수행하고, 그 계산 결과와 관측치와의 비교결과를 제시한다. 또한, 해안에서의 지진해일고의 통계적 분포에 대해 논하며, 해안에서의 지진해일고의 파고분포가 대수정규분포를 따르는 경향을 제시한다.

홍수범람해석모형을 이용한 침수피해 저감방안 연구 - 진위천 하천구간을 대상으로 - (A Study on the Mitigation of Inundation Damage Using Flood Inundation Analysis Model FLUMEN - For the Part of Jinwicheon Reach -)

  • 강수만;박민지;김상호;김성준
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2007년도 학술발표회 논문집
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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.

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빗물침투저류블록의 설치 최적지 선정을 위한 침수범람 시뮬레이션 프로그램의 개발 (Development of Inundation Flooding Simulation Program for Selecting Optimum Installation Site for Rainwater Infiltration Detention Block)

  • 김성표;이태규;류정림;박선미;최희용;최형길
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2023년도 가을학술발표대회논문집
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    • pp.129-130
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    • 2023
  • This study proposes rainwater infiltration retention blocks as a solution to the flooding problems caused by recent climate change and developed a flood prediction simulation program to select the optimal site for installing rainwater infiltration retention blocks that can minimize damage from floods. By applying the existing 2D flood analysis model G2D and adding a reservoir function, the volume of water before and after installation can be determined through simulation results.

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하천구역내 저지대 침수예측을 위한 낙동강 친수지구 홍수예측체계 구축 및 적용 (Establishment and Application of Flood Forecasting System for Waterfront Belt in Nakdong River Basin for the Prediction of Lowland Inundation of River.)

  • 김태형;곽재원;이종현;김극수;최규현
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2019년도 학술발표회
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    • pp.294-294
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    • 2019
  • 현재 홍수통제소에서 하천의 홍수를 예측하기 위한 시스템은 저류함수법 등에 의한 강우-유출모형과 FLDWAV 모형에 의한 수리학적 모형으로 이루어져 있다. 이 시스템은 주로 홍수특보지점의 기준수위 초과여부를 예측하기 위해 운영되고 있다. 한편 공원 캠핑장 자전거 도로 등 친수공간으로 활용하고 있는 하천변의 관리와 운영을 위한 정보의 수요가 급증함에 따라, 특정지점의 주의보, 경보 등의 고수위 예측 뿐만 아니라, 하천내에서 친수공간으로 활용되는 저지대 침수예측정보의 생산이 요구되고 있다. 본 연구에서는 친수공간으로 활용되는 하천내 저지대의 홍수예측정보를 생산할 수 있는 기술을 개발하였다. 1차원 수리해석 결과를 기반으로 하도버퍼링 기법을 통해 고해상도 격자 기반의 공간연산을 수행하는 모형을 구축하였으며, 해석결과로 격자기반의 침수심 및 침수구역이 표출되도록 모형을 구성하였다. 안동지구를 대상으로 지형정보 및 시설물 정보를 반영하여 모형을 구축하였으며, 안동댐 및 임하댐의 가상 방류 시나리오를 통해 친수공간의 방류량 규모별 침수여부 및 침수정도를 분석하였다. 개발된 모형을 통해 친수지구의 침수예측정보를 관계기관에 사전 제공할 수 있는 체계를 구축하여 지자체의 수방활동 및 재해예방 활동에 지원하고자 한다.

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홍수시 둔치구간의 수리해석을 위한 2차원 모형 비교 (Comparison of Two-Dimensional Model for Inundation Analysis in Flood Plain Area)

  • 구영훈;김영도
    • 한국습지학회지
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    • 제16권1호
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    • pp.93-102
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    • 2014
  • 2000년대 후반 이래로 홍수터를 활용한 생태공원이나 체육시설 등과 같은 다양한 친수시설들이 조성되었다. 또한 최근 강우강도 및 홍수 빈도의 증가로 인해 관련 피해가 급증하고 있으며, 이는 홍수터에 설치된 공원과 같은 친수시설들의 침수피해와 직접적으로 연관되므로, 극한강우 시 홍수터에서의 수치해석이 필요하다고 판단된다. 본 연구에서는 홍수터에서의 수위상승과 하강에 따른 수리학적 영향을 분석하기 위해 마름/젖음 모의가 가능한 준부정류 흐름해석모형인 FaSTMECH와 부정류 흐름해석모형인 Nays2D 모형을 이용하여 각 모델간의 태풍 사상시 시간에 따른 침수심 및 유속분포를 비교 분석하였다. 태풍 사상시 홍수터에서의 유속분포는 주수로에서의 유속에 비해 매우 낮은 유속을 보이고 있었으며, 홍수터에서는 침식보다는 토사퇴적 문제가 더 높을 것이라 판단된다.