• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.236-236
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• 2015

Flood is one of the major natural disasters affecting millions of people. Thailand also, frequently faces with this type of disaster. Especially, 2011 mega flood in Central Thailand, inundated highway severely attributed to the failure of national economic and risk to life. Lesson learned from such an extreme event caused flood monitoring and warning becomes one of the sound mitigations. The highway flood hazard mapping accomplished in this research is one of the strategies. This is due to highway flood is the potential risk to life and limb, and potential damage to property. Monitoring and warning therefore help reducing live and property losses. In this study, degree of highway flood hazard was assessed by weighting factors for each cause of the highway flood using Multi Criteria Analysis (MCA) based Analytic Hierarchy Process (AHP). These weighting factors are the essential information to classify the degree of highway flood hazard to enable pinpoint on flood monitoring and flood warning in hazard areas. The highway flood causes were then investigated. It was found that three major factors influence to the highway flood are namely the highway characteristics, the hydrological characteristics and the land topography characteristics. The weight of importance for each cause of the highway flood in the whole country was assessed by weighting 3 major factors influence to the highway flood. According to the result of MCA analysis, the highway, the hydrological and the land topography characteristics were respectively weighted as 35, 35 and 30 percent influence to the cause of highway flood. These weighting factors were further utilized to classify the degree of highway flood hazard. The Weight Linear Combination (WLC) method was used to compute the total score of all highways according to each factor. This score was later used to categorize highway flood as high, moderate and low degree of hazard levels. Highway flood hazard map accomplished in this research study is applicable to serve as the handy tool for highway flood warning. However, to complete the whole warning process, flood water level monitoring system for example the camera gauge should be installed in the hazard highway. This is expected to serve as a simple flood monitor as part of the warning system during such extreme or critical event.

• 한국수자원학회논문집
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• 제54권6호
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• pp.381-393
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• 2021

국립재난안전연구원의 재난안전 신기술 공적개발원조(ODA) 사업의 일환으로 2019년 라오스 볼리캄싸이주 남싼강유역의 보리칸을 대상으로 홍수예경보시스템을 구축하였다. 미계측 중소하천유역인 대상 지역에 강우량와 유출량의 실시간 관측을 위한 관측소 및 경보국을 설치하였으며, 실시간 자료 관리와 홍수예경보 기능 등을 수행하는 소프트웨어도 개발되었다. 홍수경보 기준 설정 및 홍수예측을 위한 nomograph 개발을 위해 대상 지역의 30년 치 연도별 최대 일강우량자료와 하천측량성과를 바탕으로 수리·수문분석을 수행하였다. 본 논문은 시스템 구축 과정과 방법론을 소개하고, 시스템 설치 후 2020년 실시간 관측 수집된 자료들을 바탕으로 수행한 시스템의 적용성 검토 결과를 제시하였다.

• 한국수자원학회논문집
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• 제40권6호
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• pp.447-458
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• 2007

본 연구에서는 해안 도시 하천의 범람으로 인한 홍수 재해 발생시 예상될 수 있는 피해에 대해 적절한 홍수예경보 및 피난대책을 수립하고자 대표적인 해안 도시 하천의 특성을 가지는 부산시 온천천 유역을 대상으로 수치지도에서 각종 지형자료를 추출하였고 수문 GIS 자료를 구축하였다. 강우 분석은 강우의 공간적 특성을 대상유역인 온천천에 티센망을 이용하여 고려하였으며 강우의 시간적 분포는 Huff의 2분위, 6차 회귀다항식을 이용하여 분석하였다. 홍수예경보 발령 기준을 설정하기 위하여 선정 지점 세 곳을 선택하여 위험수심을 선정하였다. 그리고, 하천 수리 분석을 위한 한계유출량 산정을 위해 HEC-RAS 모형을 이용 조위의 영향을 고려하여 홍수위 및 한계유출량을 산정하였고 도시 돌발 홍수 기준우량 산정을 위해 PCSWMM 2002를 이용하여 수문 분석을 실시하였다. 그 결과 온천천 유역의 홍수예경보 시스템과 이에 따른 홍수예경보 발령흐름도, 운영체계가 결정되었고 홍수예경보 발령 기준이 설정되었다. 본 연구를 통해 SWMM, HEC-RAS, ArcView GIS 모형을 연계하여 대상유역과 하도에 적용 통합적인 모의 기법을 제시하였으며 해안 도시 하천에서의 홍수 재해 발생시 이에 대한 대비책을 마련하게되었다. 앞으로 더욱 심도있게 연구하여 주요 해안 도시 하천에 대한 홍수예경보 시스템 구축이 절실히 요구된다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 추계학술발표회 논문집
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• pp.389-392
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• 2004

A recent unusual change in the weather is formed as a localized heavy rain in a short time. This phenomenon has caused a flash flood, and flash floods extensively have damaged human lives many times. In large river's case, the extent of loss of lives and properties has been decreased through the flood warning system by flood control stations of each stream. However, the extent of damage in other small rivers has increased reversely. Therefore, it is necessary to establish a new flood warning system against flash floods instead of the existing flood warning system. It is a specific character that the damage from flash floods in mountain streams brings much more loss of lives than large river's flood. The purpose of this study is calculating the characteristic of flash floods in streams, analyzing topographical characteristics of water basin through applying GIS techniques with the calculation as mentioned above and researching what topographical conditions have influence on hydrological flash floods in water basin. The flash flood prediction model we used is made by GIUH (geomorphoclimatic instantaneous unit hydrograph) with hydrologic-topographical technology. As applying the flash flood prediction model, this is a procedure for calculating topographical information in basin: we made a topological data up out of database with utilizing GIS, and we also produced a DEM (digital elevation model) and used it as a topographical data for determining amount of flash floods.

• 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.

• 한국수자원학회논문집
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• 제37권2호
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• pp.145-154
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• 2004

본 연구는 비선형성이 강한 강우-유출의 특성을 고려하여 홍수시 하도의 유출을 예측하고 하천유역의 홍수예경보에 이용하기 위하여 신경망 시스템의 모형화 가능성을 검증하였다. 신경망을 이용한 실시간 하도홍수 예측모형(Neural River Discharge-Stage Forecasting Mudel; NRDFM)은 낙동강 유역의 왜관 및 진동 지점의 홍수량 예측에 적용하였다. NRDFM에 의한 하도홍수량의 왜관 및 진동 지점 예측결과를 실측치와 비교$\cdot$검토한 결과 제시한 세 가지 모형 중 NRDFM-II의 예측성능이 가장 우수하였으며, NRDFM-I 및 NRDFM-II도 충분한 예측가능성을 보여주었다. 따라서, 본 연구에서 제시한 모형은 실시간 홍수예경보로의 적용이 가능하며, 이를 통하여 효율적으로 홍수를 통제 및 관리할 수 있을 것이다.

• 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.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2009년도 학술발표회 초록집
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• pp.2200-2204
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• 2009

In this paper the analysis of natural cause of Beijing Storm inundation and the effect of the human activities has been taken. Flood risk can hardly be eliminated solely by projects. Pre-warning system established is an efficient measure to minimize the influence of flood. Several main functions of this system and their examples are described in the paper, such as: monitoring, forecast, scheme, warning, dynamic decision-making and information publication.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2006년도 학술발표회 논문집
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• pp.28-35
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• 2006

Global Flood Alert System (GFAS) is an attempt to make the best use of satellite rainfall data in flood forecasting. The project of GFAS is promoted both by Ministry of Land, Infrastructure and Transport-Japan (MLIT) and Japan Aerospace Exploration Agency (JAXA), under which Infrastructure Development Institute-Japan (IDI) has been working on the development of Internet-based information system and just launched trial run of GFAS in April 2006 on International Flood Network (IFNet) website. The function of GFAS is to connect space agencies and hydrological services/river authorities in charge of flood forecasting and warning by providing global rainfall information in maps, text data e-mails and so on which is produced from binary global rainfall data downloaded from National Aeronautics and Space Administration (NASA) website. Although the effectiveness of satellite rainfall data in flood forecasting and warning has yet to be verified, satellite rainfall is expected to play an important role to strengthen existing flood forecasting systems by diversifying hydrological data source.

• 한국수자원학회논문집
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• 제43권1호
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• pp.51-65
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• 2010

본 연구에서는 도달시간이 짧은 중소하천유역에서 돌발홍수 발생시 강우에 따른 하천의 수위변화를 신속하고 간편하게 예측하는 홍수예경보 모형을 제시하고 그 적정성을 중랑천 유역에 대해서 검토하였다. 이를 위하여 먼저, 제방안전도 평가와 침수위험구역 조사를 통해 홍수방어목표지점으로 선정하였다. 강우량 및 관측지점수위와 홍수방어 목표지점 수위와의 상관성 분석을 하였으며, 이로부터 홍수방어목표(예보지점)지점의 수위변화를 예측할 수 있는 회귀모형을 산정하였다. 이 때 기초자료로서의 실제강우 조건에 따른 실측 수위자료는 그 범위와 조건의 수가 너무 작음으로, 이를 대신하여 다양한 강우시나리오별 유출분석을 통하여 홍수위들을 산정하고 이를 상관성 분석의 모집단 자료로 사용하였다. 산정된 회귀모형으로부터 적정 선행예보시간에 대한 수위를 산정하고 기상보정계수를 고려하여 예측수위를 보정 결정하는 방안을 제시하였다. 예측수위가 주위보수위(Flood watching level; 계획홍수량의 50 %의 수위)를 초과하는 경우에 예경보를 수행할 수 있는 시스템을 구성하였으며, 실제 호우사항에 대하여 그 적용성을 검토하였다.