• Proceedings of the Korea Water Resources Association Conference
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• 2005.09a
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• pp.741-742
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• 2005

• Water for future
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• v.20 no.3
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• pp.191-196
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• 1987

• KSCE Journal of Civil and Environmental Engineering Research
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• v.12 no.2
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• pp.109-122
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• 1992

With the uncertainty of breaching mechanism, channel roughness, and elevation-discharge relationship at the downstream dam sites, the dam break wave from the hypothetical failure of Soyanggang dam is routed by DAMBRK. Simulation results show that lower region of Seoul will be flooded in 6~8 hours which has the elevation lower than 30~20m, and most part of Chuncheon will also be flooded. The peak discharge becomes approximately 70,000 CMS at Indogyo, and 220,000~340,000 CMS at Chuncheon. Sensitivity analysis shows that the inundation feature of Seoul will hardly be affected by the failure of downstream dams.

• Journal of the Korean Society of Safety
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• v.31 no.4
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• pp.143-149
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• 2016

In this study, a series of numerical simulation of dam break flow was conducted using EFDC model, and input conditions including cell size, time step, and turbulent eddy viscosity were considered to analyze parameter sensitivity. In case of coarse mesh layout, the propagated length of the shock wave front was ${\Delta}_x$ longer than that of other mesh layouts, and the velocity results showed jagged edge, which can be cured by applying fine grid mesh. Turbulent eddy viscosity influenced magnitude of the maximum velocity passing through gate up to 20% and the cell Peclet number less than 2.0 ensured no numerical oscillations.

• Water for future
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• v.20 no.4
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• pp.285-294
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• 1987

The floodwave analysis for unsteady supercritical flow is performed. The numerical model. based on dynamic wave equation is presented by introducing the general Preissmann scheme and fore-sweep algorithm.The model is applied to Buffalo-Creek floods for proving its validity, and the simulation results have good agreements with those computed by DAMBRK and the observed data. It is also applied to Hyogi dam-break. The outflow hydrograph is derived based on the observed data and the analysis for the floodwave propagation is investigated.

• Journal of Korea Water Resources Association
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• v.44 no.3
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• pp.249-262
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• 2011

In this study, in order to reduce the numerical oscillation due to the unbalance between source and flux terms as the HLLC scheme is applied to the flow analysis on the irregular bed topography, a unstructured finite volume model based on the well-balanced HLLC scheme and the shallow water equations is developed and applied to problems of dam-break waves. The well-balanced HLLC scheme considers directly the gradient of bed topography as the flux terms is calculated. This scheme provides the good numerical balance between the source and flux terms in the case of the application to the steady-state transcritical flow. To verify the numerical model developed in this study, it is applied to three cases of hydraulic model experiments and a field case study of Mapasset dam failure (France). As a result of the verification, the predicted numerical results agree relatively well with available laboratory and field measurements. The model provides slightly more accurate results compared with the existing models.

• Water for future
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• v.22 no.3
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• pp.323-330
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• 1989

Three representative dam-break models, HEC-1, DAMBRK, and SMPDBK were analyzed respectively in theri theories and then applied to the failure of Teton Dam for which some observed data exist. From the results of this study, it can be concluded that: (1) HEC-1, which uses the hydrologic routing method, produces stable solutions for almost all the cases that were tested in this study; (2) DAMBRK, which uses the dynamic routing method, is most accurate among the three models; (3) SMPDBK, which uses the generalized dynamic routing relationships, is most economical and easily applicable.

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.6
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• pp.89-97
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• 2009

In this study, a two-dimensional unstructured finite volume model based on the shallow-water equations and well-balanced HLLC scheme is developed. The model is verified by applying to various one- and two-dimensional problems related to the analyses of dam-break wave. The predicted numerical results agree very well with available analytical solutions and laboratory measurements. The model provides slightly more accurate results compared with the existing models.

• 한국방재학회:학술대회논문집
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• 2009.02b
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• pp.147.2-147.2
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• 2009

• KSCE Journal of Civil and Environmental Engineering Research
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• v.12 no.2
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• pp.87-99
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• 1992

The types of dam-break have been classified as instantaneous and gradual failure. Equations for estimating the peak outflow have been derived respectively as a metric unit. New dimensionless routing curves have been deveoloped based on the distance parameter which has been used in SMPDBK and hydro-geometric characteristics of dams and reservoirs in Korea. These suggested curves can be used for any case of the flow of supercritical or subcritical. The computed peak flowrate shows the trend of decreasing dependence on the Froude numbers as it increases. These curves are applied to Hyogi dam. and the results have good agreements with the data observed in the peak discharges, peak elevations and flood travel time. The simplified dam-break model in this study would contribute effectively to forecast the dam-break flood in this country with minimum informations in a short time.