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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 42, Issue 12 - Dec 2009
Volume 42, Issue 11 - Nov 2009
Volume 42, Issue 10 - Oct 2009
Volume 42, Issue 9 - Sep 2009
Volume 42, Issue 8 - Aug 2009
Volume 42, Issue 7 - Jul 2009
Volume 42, Issue 6 - Jun 2009
Volume 42, Issue 5 - May 2009
Volume 42, Issue 4 - Apr 2009
Volume 42, Issue 3 - Mar 2009
Volume 42, Issue 2 - Feb 2009
Volume 42, Issue 1 - Jan 2009
Selecting the target year
Evaluation of Probability Precipitation using Climatic Indices in Korea
Oh, Tae-Suk ; Moon, Young-Il ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 681~690
DOI : 10.3741/JKWRA.2009.42.9.681
In this research, design precipitation was calculated by reflecting the climatic indices and its uncertainty assessment was evaluated. Climatic indices used the sea surface temperature and moisture index which observed globally. The correlation coefficients were calculated between the annual maximum precipitation and the climatic indices. and then climatic indices which have the larger correlation coefficient were selected. Therefore, the regression relationship was established by a locally weighted polynomial regression. Next, climatic indices were generated by montecarlo simulation using kernel function. Finally, the design rainfall was calculated by the locally weighted polynomial regression using generated climatic indices. At the result, the comparison of design rainfall between the reflection of the climatic indices and the frequency analysis did not indicate a significant difference. Also, this result can be used as basic data for calculation of probability precipitation to reflect climate change.
Hack`s Law and the Geometric Properties of Catchment Plan-form
Kim, Joo-Cheol ; Lee, Sang-Jin ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 691~702
DOI : 10.3741/JKWRA.2009.42.9.691
This study makes a systematic approach to Hack`s law considering self-affinity and self-similarity of natural basins as well as the elongation of corresponding catchment-plan forms. Catchment-plan forms extracted from DEM appear to be the population come from the interactions of 2 hypotheses on Hack`s law. It is judged that the elongation measures based on inertia moments are more intuitive than the ones based on main channel lengths. The exponent of Hack`s law, h, seems to be similar to the result of Gray`s study (1961). However Hurst exponent, H, being 0.96 imply that catchment-plan forms considered in this study have isotropic increasing properties with scale. From this point of view it is inferred that the shapes of the basins in this study would be more affected from self-similarity of main channel lengths than self-affinity of catchment-plan forms.
Evaluation of the Applicability of a Distributed Model at the Downstream of Dam
Choi, Yun-Seok ; Kim, Kyung-Tak ; Shim, Myung-Pil ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 703~713
DOI : 10.3741/JKWRA.2009.42.9.703
Dam has very important roles in both water use and flood control. Dam release and runoff from rainfall affect directly to the flood control at the downstream of dam during heavy storm especially. This study evaluates the applicability of a distributed model by applying the GRM (Grid based Rainfall-runoff Model) based on HyGIS (Hydro Geographic Information System) environment to runoff modeling at the downstream of dam where the discharge from dam and rainfall affect simultaneously. In order to do this, Yeoju watershed in Han River basin is selected. Rainfall data and discharge from Chungju regulation dam and Hoengseong dam are applied to runoff simulation. The modeling results are verified with Yeoju water level station, and they show good agreement with observed hydrographs. And this study shows that GRM is able to simulate appropriately the effect of dam discharge and rainfall on watershed runoff.
An Experimental Study on Flow Characteristic Around Inclined Crest Groyne
Kang, Joon-Gu ; Kim, Sung-Jung ; Yeo, Hong-Koo ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 715~724
DOI : 10.3741/JKWRA.2009.42.9.715
In case of inclined crest groyne, flow constriction with water is different. Therefore, it is proper to apply to narrow channel or there is a risk of overflow with water level rising caused by installation of groynes. This study were conducted experiments on inclined crest groyne. Main factors of inclined crest groyne are angles of crests slope and changes of water level. Velocity profile around groyne was measured by LSPIV (Large Scale Particle Image Velocimetry). Flow fields around groyne were analyzed focused on main channel and recirculation area. From the results, Thalweg change has little an effect on rate length and height of recirculation rises on increasing rate length. Length of recirculation area was about 12
16 times of rate length of groyne. Maximum velocity in main channel area was measured about 1.45
2.1 times of approach velocity and has little an effect on crest angle of groyne. Back water velocity recirculation area was decreased on approach velocity. This result presents to make stable flow to bank protection.
Evaluation of Flood Severity Using Bivariate Gumbel Mixed Model
Lee, Jeong-Ho ; Chung, Gun-Hui ; Kim, Tae-Woong ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 725~736
DOI : 10.3741/JKWRA.2009.42.9.725
A flood event can be defined by three characteristics; peak discharge, total flood volume, and flood duration, which are correlated each other. However, a conventional flood frequency analysis for the hydrological plan, design, and operation has focused on evaluating only the amount of peak discharge. The interpretation of this univariate flood frequency analysis has a limitation in describing the complex probability behavior of flood events. This study proposed a bivariate flood frequency analysis using a Gumbel mixed model for the flood evaluation. A time series of annual flood events was extracted from observations of inflow to the Soyang River Dam and the Daechung Dam, respectively. The joint probability distribution and return period were derived from the relationship between the amount of peak discharge and the total volume of flood runoff. The applicability of the Gumbel mixed model was tested by comparing the return periods acquired from the proposed bivariate analysis and the conventional univariate analysis.
Application of Sediment Yield Estimation Methods for an Urbanized Basin
Son, Kwang-Ik ; Roh, Jin-Wook ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 737~745
DOI : 10.3741/JKWRA.2009.42.9.737
Field measured sediment yield from an experimental urbanized basin was compared with the predicted sediment yields with RUSLE (Revised Universal Soil Loss Equation), and MUSLE (Modified Universal Soil Loss Equation). The experimental basin is 3.1km2 in area and fifty six percent of the total area had been urbanized. The hydrological data have been measured with T/M at the outlet of the experimental basin. Runoff from the basin and rainfall depth of the basin were measured every minute. Bed load and suspended load were also measured for a given flow rate. Runoff rating curves and sediment rating curve were developed for the last three years. RUSLE showed scattered prediction results but the average of the prediction values was close to the measured one. Meanwhile, MUSLE showed linear correlation between the measured sediment yield and predicted one with high correlation coefficient. But MUSLE predicts high values than the real one. Therefore, adjustment is necessary to apply MUSLE in estimation of sediment yield from the experimental urbanized basin.
A Study on the Change of Occurrence Characteristics of Daily Seoul Rainfall using Markov Chain
Hwang, Seok-Hwan ; Kim, Joong-Hoon ; Yoo, Chul-Sang ; Jung, Sung-Won ; Joo, Jin-Gul ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 747~758
DOI : 10.3741/JKWRA.2009.42.9.747
In this study, long-term variabilities of rainfall-occurrence characteristics are analyzed using rainfall data at Seoul, which is the longest data record existing in world. first, the accuracy of Chukwooki data set (CWK) are evaluated in view of rainfall-occurrence probability by analyzing the transition probabilities and occurrence characteristics based on Markov chain. And long-term inter-monthly variabilities of transition probabilities are analyzed using two dimensional LOWESS regression. From the results of analyzed transition probabilities and occurrence characteristics, it is different that rainfall-occurrence characteristics between CWK and modern rain gage data set (MRG) for original rainfall data sets (M00). For characteristics of rainfall series, occurrences probabilities of rainfall are increased and durations of each rainfall are shorter than past. And from the results of analyzing the long-term inter-monthly variabilities of transition probabilities, in case of M20, lengths of dry spells between CWK and MRG are not different significantly and lengths of wet spells are decreased persistently after A.D. 1830. Especially, decreasing trend for lengths of wet spells at recent september are appeared significantly. These results are considered with increasing trend of recent rainfall, it is concluded that recent frequencies and intensities of rainfall are increasing.
Minimization of Pump Running Cost in the Large-scale Water Supply System
Lee, Gwang-Man ; Kang, Shin-Uk ; Kim, Soo-Myung ;
Journal of Korea Water Resources Association, volume 42, issue 9, 2009, Pages 759~771
DOI : 10.3741/JKWRA.2009.42.9.759
The electricity cost of pumping system accounts for a large part of the total operating cost for long distance water supply networks. This study presents a method based on dynamic programming for establishing an joint optimal operation of pumps and storages system on a hourly basis. Analysis is taken of the relative efficiencies of the available pumps, the structure of the electricity tariff, the consumer-demand pattern, and the storage characteristics and operational constraints of the pipe. The possible system objectives and constraints are described. An application of the method to the existing Yangju Water Supply System consisted of two pump station and 5 storage pools under the condition of expanding pumping facility in the part of the Capital Area Water Supply System is presented, showing that considerable electricity cost savings are remarkable. The approach was found to be implementable in real system operation and large-scale water supply system design in respect of minimizing life-cycle total cost.