• 한국방재안전학회논문집
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• 제16권4호
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• pp.61-66
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• 2023

본 연구에서는 2020년 9월 태풍 마이삭·하이선으로 인한 침수가 일어난 삼척중학교 주변을 분석하였다. 삼척 오십천과 소하천인 등 봉천 합류 지점의 침수특성을 분석하기 위해 2차원 수리 모형인 Iber를 적용하였다. 연구에서는 2020년 9월 3일과 9월 7일의 최대유량 및 80년, 100년 빈도 홍수량을 기반으로 침수 깊이와 침수 범위를 모의하였다. 모의 결과, 9월 7일에는 80, 100년 빈도 홍수량에서 미미한 차이를 나타냈으나, 9월 3일에서 9월 7일에 최대 유량 차이가 401 m³/s로 나타나 침수 깊이에서는 0.8 m, 침수 범위에서는 7.1 m²의 상당한 차이를 보였다 또한, DEM을 이용한 등고선만을 고려한 분석에서는 삼척중학교 운동장뿐만 아니라 건물까지 침수가 예측되어 고정밀 지형자료인 DSM의 적용이 필요함을 확인하였다.

• 한국수자원학회논문집
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• 제31권4호
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• pp.429-437
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• 1998

기존의 DWOPER 모형에 대해서도 불확실도 기법을 이용한 홍수범람 해석을 위해 DWOPER-LEV 모형을 개발하였고, 하천의 홍수범람에 따른 제방의 월류위험도와 가능 범람범위를 예측할 수 있도록 하엿다. 본 연구에서는 홍수추적에 있어서의 하도단면의 기하형상과 수리저항계수에 기인한 불확실도의 영향을 검토하기 위해 Monte-Carlo 기법을 적용하였다. 개발된 모형은 남한강 유역의 실제 제방붕괴로 인한 홍수범람에 적용하여 제방의 월류위험도와 제내지에서의 가능 범람범위와 범람수심을 산정하였다.

• 환경영향평가
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• 제16권3호
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• pp.187-194
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• 2007

It started road constructions around river in 1990s. These maintenances concentrate on city river. Because river lives no living things and men don't come near there. But in spite of these river environment go to rack, river maintenances still keep on using preexistence method since 1990s. Only a part of city river environment maintenances consider environmental ability of passive river, river maintenance of a purpose of flood control still don't consider in the concrete. Because propulsion device that consider environment ability of passive river and possible application techniques don't complete. In accordance, A natural river maintenance needs absolutly a series of river projects. Because a natural river maintenance prevents a damage of environment ability. This study is to assume the flood really happened and to carry out the flood damage simulation needed in overflow simulation about the inundated zone. Also, This study examine unstable part about the hydraulic characteristic as velocities, stream power, shear, hydraulic depth, flow area in basin. And this study applied the HEC-RAS(river analysis system) model to predict flood overflow in youngsan river basin. Project flood is used the return period 100 year and inputed data that was calculated in intensity figures of illumination.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2020년도 학술발표회
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• pp.95-95
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• 2020

Urban flooding occurs in the form of internal-water inundation on roads and lowlands due to heavy rainfall. Unlike in the case of rivers, inundation in urban areas there is lacking in research on predicting and warning through measurement data. In order to analyze urban flood patterns and prevent damage, it is necessary to analyze flooding measurement data for various rainfalls. In this study, the pattern of urban flooding caused by rainfall was analyzed by utilizing the urban flooding measuring sensor, which is being test-run in the flood prone zone for urban flooding management. For analysis, 2019 rainfall data, surface water depth data, and water level data of a street inlet (storm water pipeline) were used. The analysis showed that the amount of rainfall that causes flooding in the target area was identified, and the timing of inundation varies depending on the rainfall pattern. The results of the analysis can be used as verification data for the urban inundation limit rainfall under development. In addition, by using rainfall intensity and rainfall patterns that affect the flooding, it can be used as data for establishing rainfall criteria of urban flooding and predicting that may occur in the future.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2021년도 학술발표회
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• pp.141-141
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• 2021

This study proposed an equation for Rainfall Threshold for Flood Warning (RTFW) for urban areas based on computer simulations. First, a coupled 1D-2D dual-drainage model was developed for nine watersheds in Seoul, Korea. Next, the model simulation was repeated for a total of 540 combinations of the synthetic rainfall events and watershed imperviousness (9 watersheds × 4 NRCS Curve Number (CN) values × 15 rainfall events). Then, the results of the 101 simulations with the critical flooded depth (0.25m-0.35m) were used to develop the equation that relates the value of RTFW to the rainfall event temporal variability (represented as coefficient of variation) and the watershed Curve Number. The results suggest that 1) the rainfall with greater temporal variability causes critical floods with less amount of total rainfall; and that 2) the greater imperviousness requires less rainfall to have critical floods. For validation, the proposed equation was applied for the flood warning system with two storm events occurred in 2010 and 2011 over 239 watersheds in Seoul. The results of the application showed high performance of the warning system in issuing the flood warning, with the hit, false and missed alarm rates at 68%, 32% and 7.4% respectively for the 2010 event and 49%, 51% and 10.7% for the event in 2011.

• 한국안전학회지
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• 제39권1호
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• pp.70-81
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• 2024

With heavy rainfall due to extreme weather causing increasing damage, the importance of urban flood forecasting continues to grow. To forecast urban flooding accurately and promptly, a sewer network and surface grid with appropriate detail are necessary. However, for urban areas with complex storm sewer networks and terrain structures, high-resolution grids and detailed networks can significantly prolong the analysis. Therefore, determining an appropriate level of network simplification and a suitable surface grid resolution is essential to secure the golden time for urban flood forecasting. In this study, InfoWorks ICM, a software program capable of 1D-2D coupled simulation, was used to examine urban flood forecasting performance for storm sewer networks with various levels of simplification and different surface grid resolutions. The inundation depth, inundation area, and simulation time were analyzed for each simplification level. Based on the analysis, the simulation time was reduced by up to 65% upon simplifying the storm sewer networks and by up to 96% depending on the surface grid resolution; further, the inundation area was overestimated as the grid resolution increased. This study provides insights into optimizing the simplification level and surface grid resolution for storm sewer networks to ensure efficient and accurate urban flood forecasting.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2019년도 학술발표회
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• pp.157-157
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• 2019

This study derived the Flood-Inducing-Rainfall (FIR) and the Flood-Inducing-Runoff (FIRO) from the radar-gage composite data to be used as the basis of the flood warning initiation for the urban area of Seoul. For this, we derived the rainfall depth-duration relationship for the 261 flood events at 239 watersheds during the years 2010 and 2011 based on the 10-minute 1km-1km radar-gauge composite rainfall field. The relationship was further refined by the discrete ranges of the proportion of the flooded area in the watershed (FP) and the coefficient variation of the rainfall time series (CV). Then, the slope of the straight line that contains all data points in the depth-duration relationship plot was determined as the FIR for the specified range of the FP and the CV. Similar methodology was applied to derive the FIRO, which used the runoff depths that were estimated using the NRCS Curve Number method. We found that FIR and FIRO vary at the range of 37mm/hr-63mm/hr and the range of 10mm/hr-42mm/hr, respectively. The large variability was well explained by the FP and the CV: As the FP increases, FIR and FIRO increased too, suggesting that the greater rainfall causes larger flooded area; as the rainfall CV increases, FIR and FIRO decreased, which suggests that the temporally concentrated rainfall requires less total of rainfall to cause the flood in the area. We verified our result against the 21 flood events that occurred for the period of 2012 through 2015 for the same study area. When the 5 percent of the flooded area was tolerated, the ratio of hit-and-miss of the warning system based on the rainfall was 44.2 percent and 9.5 percent, respectively. The ratio of hit-and-miss of the warning system based on the runoff was 67 percent and 4.7 percent, respectively. Lastly, we showed the importance of considering the radar-gauge composite rainfall data as well as rainfall and runoff temporal variability in flood warning system by comparing our results to the ones based on the gauge-only or radar-only rainfall data and to the one that does not account for the temporal variability.

• 한국수자원학회논문집
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• 제45권10호
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• pp.1035-1041
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• 2012

본 연구는 유역의 침수특성치를 기준으로 하여 치수계획규모를 설정하는 방법을 연구한 것이다. 본 연구에서는 2010년 9월21일 광화문일대에 발생한 침수피해를 이용하여 XP-SWMM 2010 모형을 검증한 후 침수예상도를 산정하였다. 확률강우량은 Huff의 4분위법으로 분포시켰으며, 기존의 유역출구점을 기준으로 한 임계지속시간의 문제점을 제시하였으며 침수특성치(관로첨두유출량, 평균침수심, 특정지점의 최대침수심, 침수면적, 침수총량, 침수지속시간)를 기준으로 유역치수계획규모를 설정하는 방법을 제시하였다. 현재 유역의 치수계획규모 설정시 사용되고 있는 관로첨두유출량은 도시유역의 침수특성을 합리적으로 반영하지 못하는 것으로 판단되었으며 도시유역에서 발생하는 침수의 결과치인 침수특성이 치수계획규모 설정에 합리적인 것으로 나타났다. 유역의 치수계획규모는 각 유역의 지리 물리 사회 경제적 특성에 기반한 침수특성치를 선택하여 그 유역이 감당할 수 있는 침수특성치를 제외한 나머지의 침수특성치를 극복할 수 있도록 설정해야할 것이다.

• 대한토목학회논문집
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• 제30권2B호
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• pp.169-177
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• 2010

본 연구에서는 이상기후 및 기후변화에 따른 태풍, 집중호우 등으로 발생할 수 있는 피해들을 대비하고 상황에 맞는 대응을 위한 홍수위험지도의 작성을 위하여, 낙동강의 지류인 금호강 유역에 위치하는 대구광역시 서구 지역에 대하여 국 내외 홍수위험지도 작성에 널리 이용되고 있는 FLUMEN 모형을 적용한 하도 및 제내지의 2차원 침수해석을 실시하여 대상유역에 대한 시간별 침수심과 유속을 계산하고, USBR의 Downstream Hazard Classification Guidelines에 제시된 홍수위험 분류기준에 의거하여 홍수위험지도를 작성하는 연구를 수행하였다. FLUMEN 모형을 적용한 하도 및 제내지의 2차원 침수해석은 100년 빈도 강우에 대하여 제방의 붕괴가 발생하지 않고, 월류를 통한 제내지로의 유입만 발생한다는 가정 하에 모의을 실시하였고, 대상유역에서는 100년 빈도 강우에 대하여 금호강유역에 위치한 비산동 지역의 제방에서 월류를 통한 홍수가 발생하는 것으로 확인되었으며, 하도 및 제내지에서의 2차원 침수해석 결과로 얻어진 각 Node에 대한 매시간별 수심과 유속에 관한 정보를 이용하여 홍수위험정도를 분류하였다. 본 연구방법을 통한 지역별 침수심도 및 홍수위험지도가 구축된다면 홍수로 인한 제방붕괴 또는 월류 시 지역 주민들의 비상대처 행동양식을 시스템화 할 수 있을 것이며, 고위험지역의 인명을 우선적으로 대피시키고, 차량 및 도로를 통제하는 등의 세분화된 비상대처계획을 수립하는데 유용하게 활용될 수 있을 것으로 기대된다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.435-438
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• 2008

The huge economical damage and environmental pollution have been occurred for decades because of using of fossil fuel. So the development of alternative energy is urgent. In the west sea of Korea, a proper area for tidal power plant, development and investigation for economical efficient of tidal power plant are preceeding. The water turbine generator with the capacity of 25.4MW was used to compare single-basin flood tide generation with ebb tide generation while considering the water depth and tide in the vicinity of Sukmodo.