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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 35, Issue 6 - Dec 2002
Volume 35, Issue 5 - Oct 2002
Volume 35, Issue 4 - Aug 2002
Volume 35, Issue 3 - Jun 2002
Volume 35, Issue 2 - May 2002
Volume 35, Issue 1 - Feb 2002
Selecting the target year
Profile Design of Small Alluvial Rivers Considering the Safety of Bank
Eom, Myeong-Jin ; Jo, Won-Cheol ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 241~250
DOI : 10.3741/JKWRA.2002.35.3.241
In this study, the method of Cheema et al., which is used to decide stable width and depth of the small alluvial rivers, is improved to consider the stability of mass failure and shear failure of the bank effectively. This improved method is applied to the actual rivers, and this result is compared with the result of the method of Cheema et at.. While the method of Cheema et al. could be applied to the alluvial rivers with channel width below 50m, this improved method shows good results in estimating stable width and depth up to 200m. Therefore, this improved method can be suggested as an effective technique in the profile design of small alluvial rivers.
Flow Characteristics of a Side-Weir in Rectangular Channel
Park, Tae-Seon ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 251~259
DOI : 10.3741/JKWRA.2002.35.3.251
Flow characteristics occurring a side-weir overflow in rectangular channel is investigated in this study. A numerical model based on the two -dimensional shallow-water equations is employed to review the factors influencing on the side- weir overflow discharge and the change of flow depths and velocities. It is found that the discharge coefficient which has the most significant influence on the overflow is affected by geometric characteristics of a side-weir, Froude number of the main channel flow and the flow depth of the main channel at the starting point of a side-weir. And the discharge coefficient applicable to a practical design of a side-weir is proposed by deriving a relationship between Froude number of the main channel flow at the starting point of a side-weir and Froude number of the main channel flow.
Development and Application of Two Dimensional Water Quality Model on the Downstream of Han River
Han, Geon-Yeon ; Lee, Eul-Rae ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 261~274
DOI : 10.3741/JKWRA.2002.35.3.261
The purpose of this study was to develop two dimensional contaminant transport numerical model by finite element method. The developed model system was tested for water quality analysis when contaminants from tributaries and sewage treatment Plants flow into the main river. In this study, the model was to perform calibration for reasonable parameter production and verification for reliability and accuracy. And, the proposed model was applied on the downstream of Han river using calibrated parameters. These results represented real con taminant distribution profile along the channel, and produced the good agreement in comparing calculated vague with measured value.
Streamflow Generation by Boostrap Method and Skewness
Kim, Byung-Sik ; Kim, Hung-Soo ; Seoh, Byung-Ha ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 275~284
DOI : 10.3741/JKWRA.2002.35.3.275
In this study, a method of random resampling of residuals from stochastic models such as the Monte-Carlo model, the lag-one autoregressive model(AR(1)) and the periodic lag-one autoregressive model(PAR(1)), has been adopted to generate a large number of long traces of annual and monthly steamflows. Main advantage of this resampling scheme called the Bootstrap method is that it does not rely on the assumption of population distribution. The Bootstrap is a method for estimating the statistical distribution by resampling the data. When the data are a random sample from a distribution, the Bootstrap method can be implemented (among other ways) by sampling the data randomly with replacement. This procedure has been applied to the Yongdam site to check the performance of Bootstrap method for the streamflow generation. and then the statistics between the historical and generated streamflows have been computed and compared. It has been shown that both the conventional and Bootstrap methods for the generation reproduce fairly well the mean, standard deviation, and serial correlation, but the Bootstrap technique reproduces the skewness better than the conventional ones. Thus, it has been noted that the Bootstrap method might be more appropriate for the preservation of skewness.
Derivation of an Infiltration Model at the Non-Zero Initial Moisture Condition
Park, Haen-Nim ; Jo, Won-Cheol ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 285~294
DOI : 10.3741/JKWRA.2002.35.3.285
Infiltration is one of the important processes of the hydrologic cycle determining the distribution of water and has been studied extensively. Various theories and models proposed for this process are usually applicable only when the rainfall intensity is higher than the infiltration capacity. The study by Diskin and Nazimov (1995, 1996) suggested a conceptual infiltration model that comprises two elements. The model can make an reasonable approach to the infiltration process, instead of representing the infiltration as a function of time. The study presented herein improved the existing conceptual infiltration model by an additional consideration of the initial moisture contents. The analysis results for the variation of the infiltration capacity curries for various initial moisture contents demonstrate that the model is more reasonable for the approach to the infiltration process. In addition, the results for the relationship of stormwater events-ponding time are compared with the literature values of that for a number of soil types. The agreement is rather good, leading to the conclusion that the improved model is vapid for describing the infiltration process.
Generalization of Modified TOPMODEL for Rainfall-Runoff Analysis of Sulmachun Watershed
Lee, Hak-Su ; Kim, Nam-Won ; Kim, Sang-Hyeon ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 295~306
DOI : 10.3741/JKWRA.2002.35.3.295
The modified TOPMODEL of two storage systems has been integrated to the generalized assumptions of decreasing hydraulic conductivity to vertical direction. Three different recharge functions were introduced to explore the impact of the macropore flow to vortical direction, the storage at the surface zone and the relative storage deficit of the soil matrix. Combinations of these approaches provide 30 type of the model structure for the hillslope hydrology. Developed models have been applied to several hydrologic events at the Sulmachun watershed. The performance evaluation with the Monte carlo simulation suggests that the exponential function of transmissivity reduction should be appropriate form for the physically -based hydrologic simulation on the Sulmachun watershed. It has been shown that the recharge function of macropore flow contributes to improve the predictability of the generalized version of modified TOPMODEL.
Estimation Error of Areal Average Rainfall and Its Effect on Runoff Computation
Yu, Cheol-Sang ; Kim, Sang-Dan ; Yun, Yong-Nam ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 307~319
DOI : 10.3741/JKWRA.2002.35.3.307
This study used the WGR model to generate the rainfall input and the modified Clark method to estimate the runoff with the aim of investigating how the errors from the areal average rainfall propagates to runoff estimates. This was done for several cases of raingauge density and also by considering several storm directions. Summarizing the study results are as follows. (1) Rainfall and runoff errors decrease exponentially as the raingauge density increases. However, the error stagnates after a threshold density of raingauges. (2) Rainfall errors more affect to runoff estimates when the density of raingauges is relatively low. Generally, the ratio between estimation errors of rainfall and runoff volumes was found much less than one, which indicates that there is a smoothing effect of the basin. However, the ratio between estimation errors of rainfall to peak flow becomes greater than one to indicate the amplification of rainfall effect to peak flow. (3) For the study basin in this studs no significant effect of storm direction could be found. However, the runoff error becomes higher when the storm and drainage directions are identical. Also, the error was found higher for the peak flow than for the overall runoff hydrograph.
Analysis of GIUH Model by Using GIS in River Basin
Heo, Chang-Hwan ; Lee, Sun-Tak ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 321~330
DOI : 10.3741/JKWRA.2002.35.3.321
This study aims at the analysis of the geomorphological instantaneous unit hydrograph model (GIS-GIUH) with geographic information system for the rainfall-runoff analysis of watershed which is ungaged or doesn`t have sufficient hydrologic data. The rainfall-runoff analysis was performed in Wi stream(Dongkok, Koro, Miseung, Byeungchun, Hyoreung, Museung) which is a representative experimental river basin of IHP. In the process of analysis of the GIUH model, developed GIS-GIUH model and Rosso-GIUH model were applied the study basin and computed hydrographs by these models were compared with observed hydrograph. The GiS-GIUH model shows more closely to the observed hydrograph than Rosso-GIUH model in the peak discharge of the hydrograph. For the development of the GIS-GIUH model, Gamma function factor N was given by N
Flood Runoff Simulation Model by Using API
Heo, Chang-Hwan ; Im, Gi-Seok ; An, Gyeong-Su ; Ji, Hong-Gi ;
Journal of Korea Water Resources Association, volume 35, issue 3, 2002, Pages 331~344
DOI : 10.3741/JKWRA.2002.35.3.331
This study is aimed at the development of a deterministic runoff model which can be used for flood runoff. The model is formulated by the watershed runoff model. Based on the assumptions that runoff system is nonlinear, the proposed watershed runoff model is the conceptual model. In the model structure, the conceptual model divides the runoff system into a surface structure and a subsurface structure corresponding to the surface flow, and inter flow and ground water flow respectively. The lag time effect of surface can be represented by the sub-tank of surface structure in the conceptual model. The parameter calibration of inter flow and ground water flow in the subsurface structure of the conceptual model is performed by separating the components with numeric filter The runoff coefficient(
) is expressed as the function of antecedent precipitation index(API). The parameters with the surface flow can be calibrated with the runoff coefficient(
) in the conceptual model. In the conceptual model, an algorithm is developed to calibrate the parameters automatically based on efficiency criteria. The comparative study shows that simulated value from the conceptual model well agreed to observed value.