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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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Journal DOI :
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
Selecting the target year
The study of Applicabilities for Sediment Yield Model in the Developing Area
Park, Mu-Jong ; Kim, Yang-Su ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 3~17
The purpose of this study is to understand applicabilities of sediment yield estimation technique with observed data in the field accelerated by human activity. Commonly used equations such as Universal Soil Loss Equation and Transport Research Board etc. from foreign country is not validated. And analyzing affecting parameters and understanding limit of each estimation technique is not examined, either. To test the applicabilities of several models, a hot spring development site in Chunahn city, Chungnam province is selected. Sediment yield of catchment is determined using RVSLE, TRB, MUSLE, SLEMA, and Morgan & Finned method and compared to actual measurement. It is found that RUSLE and TRB are overestimated and MUSLE dives a rotatively resonable value.
Development of a Laterally Averaged 2-Dimensional Model for Saltwater Intrusion in Estuary
Lee, Jong-Uk ; Lee, Bong-Hui ; Jo, Yong-Sik ; Yun, Tae-Hun ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 19~30
A laterally averaged 2-dimensional hydrodynamic model is newly developed. The coordinate system is first transformed to minimize the effects of irregularity of bottom and surface. The advection terms of the governing equations are then discretized by an upwind scheme. By employing an explicit scheme for longitudinal direction and an implicit scheme for vertical direction, the model is free from restriction of temporal step size caused by a relatively small grid ratio. To demonstrate the applicability of the model, calculated time histories of free surface displacements and distributions of velocity and salinity are compared with the field measurements of the Keum River Estuary before construction of the estuary dam. A reasonable agreement is observed between them.
Simplified Design of Commercial Pipes with Considering Secondary Losses
Yu, Dong-Hun ; Jeong, Won-Guk ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 31~43
The friction factor of commercial pipe varies with wide range depending on pipe type and pipe size. Various methods can describe the wide variation of friction factor with good accuracy, but they normally require an iteration process even for solution of a simple case. Power law can result in an explicit form of solver so that the power law is rigorously employed for the development of direct solution technique. The parameters used in the present form of power law are allowed to haute some variation with pipe size and Reynolds number as well as pipe type for wider coverage with good accuracy, while Hazen-Williams equation permits limited variation which accounts only for the roughness or the pipe type. Furthermore secondary loss is considered in the development of explicit equations for design of commercial pipes.
Numerical anslysis of Transcritical Flow in Open Channels Using High-Resolution scheme I. : Model Development
Kim, Won ; Han, Geon-Yeon ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 45~55
Transcritical flow is a term intended to denote the existence of both supercritical and subcritical flows within a computational domain. The major problems that need to be addressed while modeling transcritical flows include handling the differing features of signal propagation in subcritical and supercritical flow regions and maintaining conservation. The present study proposes the implicit ENO method as a high-resolution scheme for transcritical flow. This implicit ENO scheme is based on the ENO method, a new class of uniformly high-order-accurate essentially non-oscillatory implicit scheme, which has the advantage of unconditional stability. The implicit ENO scheme has not been used for the transcritical flow in open channel until now. As a result of application to the hypothetical dam-break flow, the implicit ENO scheme was ploved to produce accurate results with good robustness even though in the case of verb strong shock wave.
Numerical Anslysis of Transcritical Flow in Open Channels Using High-Resolution scheme II. : Applications
Kim, Won ; Han, Geon-Yeon ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 57~65
A numerical model for analyzing transcritical flow in open channel is tested to various cases of channel shape. As the numerical models developed for transcritical flow until now mainly focused on the application to only prismatic or hypothetical channels, there are some restrictions to apply the nonprismatic channels. In this study, to verify the accuracy and stability of second-order implicit ENO scheme, the numerical model was applied to the channels which haute the varying channel bed and width. Also the numerical model was applied to unsteady flow as well as steady flow. The study shows that the numerical model provides good accuracy in the calculation of stage and velocity with no numerical oscillation, particularly in the calculation of hydraulic jump and discontinous flow Then the implicit ENO scheme demonstrated good accuracy as a high-resolution scheme and stability as an implicit scheme.
An Analysis on Hydrologic Characteristics of Design Rainfall for the Design of Hydraulic Structure
Lee, Jeong-Sik ; Lee, Jae-Jun ; Park, Jong-Yeong ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 67~80
This study is to propose temporal pattern of design rainfall which causes maximum peak discharge and to analyze the variation in peak discharge according to design rainfall durations. In this study, the Mononobe, the Yen and Chow triangular, the Huff's 4th quartiles and the Keifer and Chu methods are applied to estimate the proper temporal pattern of design rainfall and three rainfall-runoff models such as SCS, Nakayasu, and Clark methods are used to estimate the runoff hydrograph. And to examine the variability of peak discharge, the hydrologic characteristics from the rainfall-runoff models to which uniform rainfall intensity is applied are used as the standard values. The type of temporal pattern of design rainfall which causes maximum peak discharge in both of the watersheds and the rainfall-runoff models has resulted in Yen and Chow distribution method with the dimensionless vague of 0.75. On the basis of determined temporal pattern, the examination of the variability of peak discharge according to design rainfall durations shows that design rainfall duration varies greatly with the types of probable intensity formula, and the variation of peak discharge is more affected by the types of probable intensity formula and I-D-F currie than rainfall-runoff models.
The Application and Analysis of Scale Effect on Dynamic Flood Frequency Analysis
Mun, Jang-Won ; Yu, Cheol-Sang ; Kim, Jung-Hun ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 81~90
A dynamic flood frequency analysis model was proposed for the frequency analysis in ungaged catchment and applied to 6 subbasins in Pyungchang River basin. As the dynamic flood frequency model requires precipitation, rainfall loss system, and runoff analysis, we adopt the rectangular pulse model, the SCS formula, and the geomorphoclimatic IUH(GcIUH) for the application. Input data for the analysis was borrowed from the results of the statistical flood frequency analysis using L-moment method for the same catchment, and then the return period was estimated using the model. This result was also compared with the return period estimated from the statistical analysis. By comparing with the results from two cases, we found the dynamic flood frequency analysis gave higher estimates than those from statistical analysis for the whole subbasins. However, the dynamic flood frequency analysis model has a potential to be used for determining the design flood for small hydraulic structure in ungaged catchment because it uses only physical parameters for flood frequency analysis. And this model can be easily applicable to other watersheds as the scale effect is negligible.
Conjunctive Numerical Model of Surface Runoff and River Flow
Yu, Dong-Hun ; Lee, Jeong-Yeong ;
Journal of Korea Water Resources Association, volume 34, issue 1, 2001, Pages 91~103
In this studs, hydraulic routing model has been developed to predict the water level and discharge in each river section with considering the full interaction between surface runoff and river flow. It improved the computation of flood runoff by reflecting the shape of hydrograph that was determined by the geological and flood characteristics, and the excessive computation of the peak discharge was eliminated by considering the effect of infiltration. The Inflow from surface runoff to river flow was applied to the equation of continuity by implementing effectively the flow in a number of river section, and resulted in a numerical stability at the rapid variation of rainfall. Measurements were conducted during heavy rain in the watershed area of Yang-Yang Namdae-Chun. The present model was tested to the field, and the computed results were compared to the observed data. Its applicability was confirmed with its verification.