• 한국산학기술학회논문지
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• 제15권4호
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• pp.2460-2468
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• 2014

본 최근 이상기후 현상으로 인하여 단시간동안 특정지역에 집중되는 국지성호우가 빈번하게 발생하고 있어, 잠재적인 침수재해에 대비하기 위해 적합한 설계빈도를 적용할 필요가 있다. 그러나 하천설계기준을 살펴보면 배수문의 수문설계빈도는 20년 이상으로만 명시되어 그 설계빈도에 대한 기준이 상세하지 않음을 알 수 있다. 하지만 침수피해를 저감하기 위해 외수를 고려한 제내지 침수모의가 수행되어 정량적 평가를 요한다. 내수침수모의는 보통 수리 수문학적 특성을 동시에 고려하여 매우 복잡하고 시간이 오래 소요되었다. 따라서, 본 연구에서는 기 설립된 하천관련 보고서를 이용하여 간단하면서도 단시간에 평가할 수 있는 방법을 제안하였고, 하천의 중류 및 하류에 배수문이 설치된 5개소의 제내지를 대상으로 설계빈도에 따른 9가지 확률강우량을 적용하여 설계빈도 및 위치에 따른 영향을 평가하였다.

• 한국해양환경ㆍ에너지학회지
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• 제13권4호
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• pp.270-278
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• 2010

선행연구에서 우리나라 남해안을 대상으로 상용모형인 MIKE21 모형을 사용하여 실시간 조석 및 조석-해일 결합모형을 수립하였다. 본 연구에서는 이를 토대로 마산해역에서 범람모의에 대한 적용성을 검토하였다. 실제 적용에 앞서 가상적인 인공구조물의 범람에 대한 영향성 분석을 시행하였다. 범람 모의에 인공구조물을 포함시킨 결과 침수속도가 지체되어 침수면적이 감소하고 있는 반면 침수심은 별 차이를 보이지 않고 있다. 한편 실해역에 대한 결합모형과 폭풍해일모형의 범람 적용을 비교한 결과, 침수면적과 침수심은 유사한 결과를 보이고 있는 반면 최대 범람에 이르는 시간은 결합모형이 보다 타당한 결과를 나타내고 있다.

• 한국농공학회논문집
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• 제62권4호
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• pp.33-43
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• 2020

In order to reduce damage from farmland inundation caused by recent climate change, it is necessary to predict the risk of farmland inundation accurately. Inundation modeling should be performed by considering multiple time distributions of possible rainfalls, as digital forecasts of Korea Meteorological Administration is provided on a six-hour basis. As building multiple inputs and creating inundation models take a lot of time, it is necessary to shorten the forecast time by building a data base (DB) of farmland inundation probability. Therefore, the objective of this study is to establish a DB of farmland inundation probability in accordance with forecasted rainfalls. In this study, historical data of the digital forecasts was collected and used for time division. Inundation modeling was performed 100 times for each rainfall event. Time disaggregation of forecasted rainfall was performed by applying the Multiplicative Random Cascade (MRC) model, which uses consistency of fractal characteristics to six-hour rainfall data. To analyze the inundation of farmland, the river level was simulated using the Hydrologic Engineering Center - River Analysis System (HEC-RAS). The level of farmland was calculated by applying a simulation technique based on the water balance equation. The inundation probability was calculated by extracting the number of inundation occurrences out of the total number of simulations, and the results were stored in the DB of farmland inundation probability. The results of this study can be used to quickly predict the risk of farmland inundation, and to prepare measures to reduce damage from inundation.

• 한국산학기술학회논문지
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• 제8권5호
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• pp.1192-1200
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• 2007

도시유역의 강우 유출은 대부분 불투수지역인 도시유역의 유출 특성상 빠른 도달시간을 갖는다. 일반적으로 도시유역에서의 강우 유출은 배수펌프장으로 집수되어 하천으로 배제된다. 그러나 설계강우를 초과하는 호우가 발생하였을 때에는 배수펌프장의 용량을 초과하여 전량 하천으로 배제하기가 어려우며 따라서, 도시유역에서의 내수침수위험성이 증가하게 된다. 현행의 배수펌프장에서의 펌프 운영 기준은 배수펌프장의 집수정 또는 유수지의 수위에 따라서 가동되도록 구성되어있다. 그러나 최근 빈번히 발생하는 국지적 집중호우는 배수펌프장의 설계용량을 초과하는 경우가 대부분이며 배수펌프장이 제어할 수 없는 강우 유출은 도시유역에서의 내수침수를 발생시킨다. 본 연구에서는 도시 지하차도에서의 실제 내수침수 사례에 대한 모의를 통하여 당시 침수 발생의 요인을 분석하고 펌프 운영에 대한 변화를 통하여 배수펌프장 강제배제시설에 대하여 평가하였다.

• 한국해양공학회지
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• 제24권1호
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• pp.68-75
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• 2010

Recently, the intensity and frequency of typhoons have been on the increase due to unusual weather phenomena and climate change. In particular, on September 13, 2003, typhoon MAEMI (0314) caused heavy damage in the provinces of Busan and Gyongnam, but also provided an opportunity to perform a variety of studies on storm surge. According to investigation reports on the damage resulting from typhoon MAEMI, the areas where coastal inundation occurred were located in reclaimed land under coastal development. In this study, through an image data analysis of historic and present day typhoons affecting Masan, we found that the inundation damage areas corresponded to reclaimed lands. Therefore, using the area around Busan, including the southeastern coast of Korea where typhoons lead to an increased storm surge risk, we performed a storm surge/inundation simulation, and examined the inundation effect on reclaimed land due to the intensified typhoons predicted for the future by climate change scenarios.

• 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.

• 한국농공학회논문집
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• 제65권4호
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• pp.25-32
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• 2023

KDS (Korean Design Standard) for agricultural drainage is a planning standard that helps determine the appropriate capacity and type of drainage facilities. The objective of this study was to analyze the inundation of the agricultural basin considering the current design standard and the critical rainfall duration. This study used the rainfall durations of 1-48 hour, and the time distribution method with the Chicago and the modified Huff model. For the runoff model, the NRCS (Natural Resources Conservation Service) unit hydrograph method was applied, and the inundation depth and duration were analyzed using area-elevation data. From the inundation analysis using the modified Huff method with different rainfall durations, 4 hours showed the largest peak discharge, and 11 hours showed the largest inundation depth. From the comparison analysis with the current method (Chicago method with a duration of 48 hours) and the modified Huff method applying critical rainfall duration, the current method showed less peak discharge and lower inundation depth compared to the modified Huff method. From the simulation of changing values of drainage rate, the duration of 11 hours showed larger inundation depth and duration compared to the duration of 4 hours. Accordingly, the modified Huff method with the critical rainfall duration would likely be a safer design than the current method. Also, a process of choosing a design hydrograph considering the inundation depth and duration is needed to apply the critical rainfall duration. This study is expected to be helpful for the theoretical basis of the agricultural drainage design standards.

• 융합정보논문지
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• 제10권10호
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• pp.115-122
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• 2020

기후변화에 의해 전례없는 폭우가 빈번하게 내려 도심지에서는 인명 및 재산 손실 등의 침수피해를 반복적으로 겪고 있다. 도심지 침수의 두가지 주요 인자는 하천범람과 내수침수이다. 그러나, 기존 대부분의 연구에서는 침수의 두가지 주요 인자에 의한 복합적인 기작을 무시하고 각 결과를 단순 선형합으로 침수 영향을 산정하여 부정확한 결과를 도출하였다. 본 연구에서는 내수침수와 하천범람을 동시에 모의하여 분석하였다. 하천범람 해석을 위해 Petrov 안정화 기법을 적용하여 충격파의 전달을 정확하게 포착할 수 있도록 하였으며, Flux-blocking 알고리즘을 탑재하여 마름/젖음을 안정적으로 모의하였다. 또한 EGR 기법에 의한 생성/소멸항을 천수방정식에 추가하여 내수침수 해석 모듈을 반영하였다. 내수침수와 하천범람을 동시에 모의하는 경우 침수와 범람에 의한 흐름의 상쇄효과와 중첩효과를 보다 정밀하게 반영할 수 있으므로, 개별합으로 산정한 결과에 비해 정확한 결과를 도출할 수 있었다.

• 한국해양공학회지
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• 제22권4호
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• pp.34-39
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• 2008

The aim of this study is to investigate the inundation characteristics over coastal area due to the variation of sea level and plane arrangement of manholes using the 3D numerical model that is able to simulate directly interaction of WAve Structure Sandy beach(LES-WASS-3D). At first, The adopted model was validated through the comparison with an existing experimental data and showed fairly nice agreement. And then, the inundation characteristics over coastal area are discussed in relation to the variation of sea level and plane arrangement of manholes.

• 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).