• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.4
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• pp.437-442
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• 2005

The forecasting of flood runoff in the river is essential for flood control. The purpose of this study is to test a development of system for flood runoff forecasting using neural network model. For the flood events the tested rainfall and runoff data were the input to the input layer and the flood runoff data were used in the output layer To choose the forecasting model which would make up of runoff forecasting system properly, real-time runoff in the river when flood periods were forecasted by using the neural network model and the state-space model. A comparison of the results obtained by the two forecasting models indicated the superiority and reliability of the neural network model over the state-space model. The neural network model was modified to work in the Web and developed to be the basic model of the forecasting system for the flood runoff.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.342-342
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• 2023

메콩강을 공유하는 6개국은 주로 강의 개발과 수자원의 활용을 통해 경제성장을 이룩하고 있다. 하지만, 각국의 산업화나 경제성장의 수준, 메콩강에 대한 의존도와 관심, 전략 등이 서로 달라 개발에 따른 국가 간 수자원 공유, 환경피해, 지역보존 등의 문제들이 발생하고 있다. 메콩지역의 국가 중 베트남은 하천유역의 많은 부분이 국가공유하천으로 인접국가의 유역개발에 따라 다양한 물 분쟁이 발생할 수 있으며, 잦은 홍수피해가 발생하고, 낙후된 사회인프라로 인해 이수 및 수질오염과 관련된 물 문제 역시 지역적으로 발생하고 있다. 해당지역의 물 문제해결을 위한 정책결정의 지원을 위해서는 수리·수문학적 기초 또는 상세 분석이 필요하며, 본 연구에서는 매년 홍수와 대규모 범람, 비효율적 댐운영으로 인한 가뭄, 염수침입 등의 물 문제가 발생하는 Ca River 유역을 대상유역으로 선정하고 K-series SW 기반의 홍수범람 해석을 수행하였다. K-water에서 개발된 다양한 K-Series SW 중 연구대상유역인 Ca River 하류 유역에 대한 적용에 적합한 모형을 기존 현황조사 등을 바탕으로 1차원 하천흐름해석을 위한 K-River, 2차원 홍수범람해석을 위한 K-Flood 모형을 선정하고 분석을 수행하였다. 2010년과 2013년의 홍수기를 대상으로 K-River모형을 이용하여 Ca river 하류의 수리학적 현상을 해석하였으며, 해당 결과를 기반으로 K-Flood 모형을 이용한 2차원 홍수범람해석을 수행하고 실제 범람지도와의 비교를 수행하였다. 그리고 결과검토를 통해 모의 결과가 수위에 대해 높은 재현성을 보이고 있으며 범람면적과 침수심의 모의결과가 실제 침수양상과 비슷한 양상을 보임을 확인하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.12
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• pp.768-777
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• 2017

The efforts to improve river levee maintenance technologies have accelerated globally in a bid to deal with the flood damage resulting from the changes to the climate and flood events. This paper, in line with such tendency, proposes an evaluation system of a river levee safety map to maintain the river levee in an efficient manner. The concept of a river levee safety map is aimed at maximizing the maintenance efficiency for a manager to indicate the safety index, including the current river levee sliding, piping, and visual inspection on a GIS map. To develop such an evaluation system, a safety index covering the sliding, piping, and visual inspection are designated through the data and document examination and the rational guideline to classify each index into three grades, A, B, and C, is proposed. Based on the guideline proposed, the sliding and piping characteristics in terms of safety depending on the change to the flood water level duration time at the test section (Nam river) were evaluated by numerical analysis. As a result, both the protected landside and riverside satisfied the requirements for Grade A in terms of sliding, and when it comes to piping, the grade declined to C because the flood water level duration time increased at R2. As a planning study to propose a river levee safety map evaluation system, a further advanced study, standardization of the river levee data, and improvement of the existing system and laws are required.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.9
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• pp.20-29
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• 2018

Owing to the changing climate and recent flood events, flood damage caused by river levee collapse and overflow is on the rise in Korea, making it necessary to enhance river levee maintenance technologies to deal with various flood damage scenarios. This paper proposes the evaluation system of a river-levee safety map to improve maintenance efficiency and disaster responsiveness. A river-levee safety map, indicating sliding, piping, visual inspection, scouring, and safety index of a levee fill material on a GIS map will enable the dangerous zone to be identified visually and the development of proactive measures to deal with it. This will maximize the river-levee maintenance efficiency, which is a break from traditional practice in that restoration measures are taken only after the damage has occurred. This study includes scouring and levee fill material in addition to previously-proposed sliding, piping and visual inspections. The research activities conducted in the study include 1) categorization of scouring and levee fill material based on document and data examination, 2) evaluation of sliding and piping at 5 locations on the left levee in the Nam river according to the duration time of the flood water level, and 3) evaluation of the characteristics of scouring and levee fill material at 9 locations on the left/right levee in the Nam River. The river levee safety map proposed in this study would be more useful and practical but further study on the manual for river management organization, repair and reinforcement methods, and budget is required.

• Journal of Wetlands Research
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• v.19 no.3
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• pp.335-344
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• 2017

In this study, We proposed a method to estimate the design flood by area ratio in an ungauged basin. For that, the discharge parameters was determined by calibration of observed data at the watershed outlet and then peak flow was estimated by area ratio. In order to verify suggested method, peak flow was compared the observed discharge of the small river basin and the design flood discharge of river implementation projects. The results were summarized as follows. As a result of comparing the discharge by the area ratio and observed discharge, the difference of peak flows were analysed 14 ~ 25%. When the discharge calculated with area ratio of small river was compared with the design flood discharge of river implementation projects, the relative error was analyzed to be less than 20%. It means that suggested method in this study is appropriate.

• Journal of Korea Water Resources Association
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• v.31 no.4
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• pp.415-427
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• 1998

FIAS (Flood Inundation Analysis System) using Arc/Info is developed and applied to the South Han River basin. The DWOPER model is revised and expanded to handle simultaneous multiple overtopping and/or breaking and to estimate the inundation depth and extents. The model is applied to an actual levee overtopping case, which occurred on August 23~27, 1995 in the South Han 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(Arc/Info Macro Language). Two-and three-dimensional inundation maps by Arc/Info are presented. The computed inundation extends agree with observations in terms of inundation depth and flooded area. Keywords : River, Floodwave, Flood Inundation, Geographic Information System.

• Water for future
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• v.28 no.4
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• pp.171-183
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• 1995

The Snyder's Unit Hydrograph Method is applied to simulate the November 1985 Flood of the Cheat River Basin, which is located in the North-East region of West Virginia in United States. The entire basin is divided into many subareas according to the hydrologic and geologic characteristics. The overland flows are computed on each subarea and combined together along the streams. The flows are also routed by the Normal Depth Storage and Outflow Method in Modified Pulse option. The several structural flood control alternatives are examined. The study shows the OPTION III which has the three moderately sized dam is ultimately suitable to control the flood. The HEC-1 computer model is used to analyze the flood.

• Korean Journal of Environment and Ecology
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• v.9 no.1
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• pp.42-48
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• 1995

Freshwater fish fauna in Pyongchangang in which having been constructed to water supply for Chechon city was carried out to clarify the impacts of ecosystem on freshwater fish as rapid reduction of constant river flood both Sep. 25, 1994 and Oct. 7, 1994 ~ Oct. 9, 1994. It was 28 species of 21 genera on 6 Families freshwater fishes including a natural monument at and many endemic species among 6 survey stations in Pyongchang. The Pyongchang that was moved in a zigzag direction having been keep constant flood and high diversity of freshwater fishes. There was a high possibility of serious extinction on freshwater fishes as rapid reduction of constant flood in Pyongchangkang.

• Journal of Korea Water Resources Association
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• v.36 no.4
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• pp.661-671
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• 2003

The reliability model is developed for analyzing parameter uncertainty and estimating of flood inundation characteristics in a protected lowland. The approach is based on the concept of levee safety factor and the statistical analysis of model parameters affecting the variability of flood levels. Monte Carlo simulation is incorporated into the varied flow and unsteady flow analysis to quantify the impact of parameter uncertainty on the variability of flood levels. The model is applied to a main stem of the Nakdong River from Hyunpoong to Juckpogyo station. Simulation results show that the characteristics of channel overflow and return now are well simulated and the mass conservation was satisfied. The inundation depth and area are estimated by taking into consideration of the uncertainty of width and duration time of levee failure.

• Journal of Korea Water Resources Association
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• v.48 no.6
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• pp.511-522
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• 2015

This study assessed the impact of uncertainties in flood data on the results of flood frequency analysis for Han river basin. To meet this aim, this study quantified assessment focused on the index flood and quantile by regional flood frequency analysis using the flood data from 17 water level gauges in Han river basin. We analysed the results categorized by three cases according to the characteristics of the measured data. Firstly, we analyzed the regional flood frequency for the water level gauge in the Pyungchang river basin to investigate the impact of water level data. The results has the error of 0.240 with respect to the mean flood. Secondly, we examined the impact of uncertainty in measurement data generated by the application of rating on the results of regional flood frequency analysis. We have compared the results by applying the rating estimated for each year to the one by the recently estimated rating. The results showed that the mean error has 0.246 in terms of the mean flood. Finally, we have inferred the regional flood frequency analysis results with the regulated flow in the downstream area of dams. The regulated specific discharge in the downstream area of dams controlled by dam operation showed a large difference to the estimated specific discharge in the downstream area of dams by extension of the natural specific discharge in the upstream area using the regionalization method.