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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Water Resources Association
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Korea Water Resources Association
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Volume & Issues
Volume 34, Issue 6 - Dec 2001
Volume 34, Issue 5 - Oct 2001
Volume 34, Issue 4 - Aug 2001
Volume 34, Issue 3 - Jun 2001
Volume 34, Issue 2 - Apr 2001
Volume 34, Issue 1 - Feb 2001
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Development of Hydrodynamic Model on the Downstream of Han River by Using Geographical Information System
Han, Geon-Yeon ; Lee, Eul-Rae ; Park, Jae-Hong ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 107~118
This study was to develop a tow-dimensional model system for the hydrodynamic analysis and to apply the system on the downstream of Han River. it is performed to design a GIS-based hydrodynamic system for the scientific shallow water profile analysis, and to compare hydrodraulic modeling is the Petrov-Galerkin's finite element method for flow prediction model. This study was to construct a GIS-based river flow system, and it is useful for supporting user's decision making for the on-line status through various analysis. We expect that the results from this study can be used as one of the guidelines for river analysis and management system in order rivers, reservoirs, and estuaries.
Frequency Analysis of Daily Rainfall in Han River Basin Based on Regional L-moments Algorithm
Lee, Dong-Jin ; Heo, Jun-Haeng ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 119~130
At-site and regional frequency analyses of annual maximum 1-, 2-, and 3-days rainfall in Han River basin was performed and compared based on the regional L-moments algorithm. To perform regional frequency analysis, Han River basin was subdivided into 3 sub-basins such as South Han River, North Han River, and downstream regions. For each sub-basin, the discordancy and homogeneity tests were performed. As the results of goodness of fit tests, lognormal model was selected as an appropriate probability distribution for both South Han River and downstream regions and gamma-3 model for North han River region. From Monte carlo simulation, RBIAS and RRMSE of the estimated quantiles from regional frequency analysis and at-site frequency analysis were calculated and compared each other. Regional frequency analysis shows less RRMSE of the estimated quantiles than at-sites frequency analysis in overall return periods. The differences of BRMSE between two approaches increase as the return period increases. As a result, it is shown that regional frequency analysis performs better than at-site analysis for annual maximum rainfall data in Han River basin.
A Study on the Estimation of Sediment Yield Based on a Distributed System Concept
Kim, Ung-Tae ; Yun, Yong-Nam ; Park, Mu-Jong ; Yu, Cheol-Sang ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 131~140
The present study is focused on improving the methodology for the determination of parameters involved in USLE(Universal Soil Loss Equation) based on distributed system concept and investigation of sediment delivery ratio. Generally the distributed system concept consists of grid networks throughout the watershed and sediment can be traced from grid to rid in the direction of the steepest descent. The sediment yield data together with physical data of 10 small irrigation reservoirs in Kyounggi-Do are collected. After the sediment delivery ratio of a grid is defined to be related tothe fraction of forested or covered with delivery proofing area of the grid, the preportionality coefficient(C
) is introduced. The distributed system model is calibrated using the available data for 8 reservoirs and is verified with the data for the ramaining 2 reservoirs, and regression analysis is made to express the proportionality coefficient
in terms of watershed physical characteristics. By applying this results the verification of the distributed system model for 2 reservoirs showed a fair result, which justifies the applicability of the proposed method in the present study.
An Experimental Study on the Collapse Phase of a River Leeve(I) -Effects of the Geometric Characteristics of Cross Section
Lee, Sang-Tae ; Lee, Jong-Tae ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 141~154
An experimental study was performed to investigate the effects of levee crest width and the slope steepness on levee break due to overtopping flow. The phenomenon of bank failure can be described in 4 stages. In this study, the magnitudes of breach width, breach depth peak discharge, and scouring shape at the break site were measured, and the result shows that peak discharge will be reduced and breach duration extended by widening the crown width and lessening the levee slope steepness. The breach width was narrower and the breach depth deeper, as the levee crest width become wider or the slope steeper. And, the bed scour depth was deeper and steeper, as the levee crest crest width become narrower or the slope milder.
An Experimental Study on the Collapse Phase of a River Leeves(II) -Effect of the Soil Properties and Compactness
Lee, Jong-Tae ; Lee, Sang-Tae ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 155~167
The effects of bank crest width, slope steepness, soil properties, and soil compactness on the characteristics of levee breach due to overlfow were investigated through a series of experiments. Generally, the major factors influencing the breach phenomenon are compactness, soil properties. crest width, and slope steepness, in that order. Using proper soil, and ensuring enough compactness in bank construction are very essential for extending breach duration and reducing peak overflow ranges for the values of breach duration, breach width, width-to-depth ratio, and side slope of the breach section, proposed by Singh, MacDonald and Fread based on the field data for earth dam breaks were reasonable. We found that those criteria could also be applied to the phenomenon of levee breaching.
Numerical Simulation of Transoceanic Propagation and Run-up of Tsunami
Jo, Yong-Sik ; Yun, Seong-Beom ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 169~176
The propagation and associated run-up process of tsunami are numerically investigated in this study. A transoceanic propagation model is first used to simulate the distant propagation of tsunamis. An inundation model is then employed to simulate the subsequent run-up process near coastline. A case study is done for the 1960 Chilean tsunami. A detailed maximum inundation map at Hilo Bay is obtained and compared with field observation and other numerical model predictions. A very reasonable agreement is observed.
Development of TVD Numerical Models: I. Linear Advection Equation
Lee, Jong-Uk ; Jo, Yong-Sik ; Yun, Gwang-Seok ; Yu, Tae-Hun ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 177~186
By using he total variation diminishing (TVD) condition, accurate and upwind based schemes are firstly introduced to develop numerical models free from nonphysical oscillations in the vicinity of large gradients. These models are then applied to both abruptly and smoothly varying initial conditions. By comparing computed predictions to analytical solutions, it is clearly shown that the first-order upwind scheme produces the numerical viscosity and the second-order Lax-Wendroff scheme produces the spurious oscillations. However, the TVD scheme gives the most reasonable results.
Development of TVD Numerical Models: II. Shallow-Water Equations
Lee, Jong-Uk ; Jo, Yong-Sik ;
Journal of Korea Water Resources Association, volume 34, issue 2, 2001, Pages 187~195
In this study, a numerical model describing the shallow-water equations is newly developed by using a TVD scheme. The model has a second-order accuracy in time and space and is free from nonphysical oscillations, even in the vicinity of large gradients. Because a upwind based TVD scheme requires a Riemann solver, the HLLC scheme is employed in this model. To calibrate the applicability and accuracy, the developed model is used to simulate dam-break waves in an ideal channel and a sloshing flow n a paraboloidal basin. Agreements between numerical predictions and analytical solutions are very resonable.