Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korea Water Resources Association
Journal Basic Information
Journal DOI :
Korea Water Resources Association
Editor in Chief :
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
A Runoff Parameter Estimation Using Spatially Distributed Rainfall and an Analysis of the Effect of Rainfall Errors on Runoff Computation
Yun, Yong-Nam ; Kim, Jung-Hun ; Yu, Cheol-Sang ; Kim, Sang-Dan ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 1~12
DOI : 10.3741/JKWRA.2002.35.1.001
This study was intended to investigate the rainfall-runoff relationship with spatially distributed rainfall data, and then, to analyze and quantify the uncertainty induced by spatially averaging rainfall data. For constructing spatially distributed rainfall data, several historical rainfall events were extended spatially by simple kriging method based on the semivariogram as a function of the relative distance. Runoff was computed by two models; one was the modified Clark model with spatially distributed rainfall data and the other was the conventional Clark model with spatially averaged rainfall data. Rainfall errors and discharge errors occurred through this process were defined and analyzed with respect to various rain-gage network densities. The following conclusions were derived as the results of this work; 1) The conventional Clark parameters could be appropriate for translating spatially distributed rainfall data. 2) The parameters estimated by the modified Clark model are more stable than those of the conventional Clark model. 3) Rainfall and discharge errors are shown to be reduced exponentially as the density of rain-gage network is increased. 4) It was found that discharge errors were affected largely by rainfall errors as the rain-gage network density was small.
A Model Development for Swash Hydrodynamics Across the Shore
Hwang, Kyu-Nam ; Cho, Yong-Sik ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 13~24
DOI : 10.3741/JKWRA.2002.35.1.013
In a physically realistic but simplified manner, an attempt is made in this study to develop a predictive model for swash hydrodynamics across the shore due to the storm waves on an arbitrary beach profile. Date from the SUPERTANK laboratory Data Collection Project are used for the model development, in which experiments were designed to simulate dune erosion under storm conditions at a prototype scale. The model predicts variations of swash height, velocity and period across the beach face in a swash zone. In general, the model proves to be capable of predicting variations of swash height, velocity and period across the shore. Quantitatively better predictions for the swash parameters could be achieved by improving the prediction of the beach face elevation, ymax, where the significant swash height becomes zero.
Radar Rainfall Estimation Using Window Probability Matching Method : 1. Establishment of Z
-R Relationship for Kwanak Mt, DWSR-88C at Summer, 1998
Kim, Hyo-Gyeong ; Lee, Dong-In ; Yu, Cheol-Hwan ; Gwon, Won-Tae ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 25~36
DOI : 10.3741/JKWRA.2002.35.1.025
Window Probability Matching Method(WPMM) is achieved by matching identical probability density of rain intensities and radar reflectivities taken only from small window centered about the gage. The equation of
relationship is obtained and compared with data between a DWSR-88C radar and high density rain gage networks within 150km from radar site in summer season, 1998. The probability density of radar effective reflectivity is distributed with high frequency near 15dBZ. The frequency distribution of rain intensities shows that rain intensity is lower than 10mm/hr in most part of radar coverage area. As the result of
relationship using WPMM, curved line has shown to the log scale spatially and it can be explained more flexible than any straight-line power laws at the transformation to the rainfall amount from
value. During 3 months, total radar cumulative rainfall amount estimated by
and WPMM relationships are 44 and 80 percentages of total raingage amount, respectively. Therefore,
relationships by WPMM may be widely needed a statistical method for the computation of accumulated precipitation.
A Study of Optimal Operation Policy using Risk Evaluation Criteria(I) (for the Daechung Multi-purpose Reservoir)
Park, Myeong-Gi ; Kim, Jae-Han ; Jeong, Gwan-Su ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 37~49
DOI : 10.3741/JKWRA.2002.35.1.037
The application of conventional method for optimizing firm water supply and hydro-electric power generation has some limitation during abnormal or extreme drought periods. Hashimoto et al. (1982) suggested there risk evaluation criteria such as reliability, resilience, and vulnerability. These three criteria have been incorporated into a mixed-integer programming model for evaluating the possible performance of water- supply reservoir (Moy et al., 1986; Srinivasan et al., 1999). However, till now, these kind of researches have been conducted only for water-supply reservoir. Therefore there have been no other study for multi-purpose dam including hydro-electric power generation. This study presents an improved formulation of the previous model for evaluating a multi-purpose reservoir system operation considering water supply and hydro-electric power generation. The modified model was applied to the Daechung multi-purpose reservoir system in the Keum river basin to demonstrate the efficiency of the improved formulation.
A Study of Optimal Operation Policy using Risk Evaluation Criteria(II) (for the Han River Reservoirs System)
Park, Myeong-Gi ; Kim, Jae-Han ; Jeong, Gwan-Su ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 51~64
DOI : 10.3741/JKWRA.2002.35.1.051
In this study, the formulation of the developed mixed-integer programming model for a multi-reservoir system including hydro-electric power generation (park et al., 2001) has been improved for multiple reservoir system operation using risk evaluation criteria. Sequential linear programming(SLP) was applied for the linearization of the hydro-electric energy term in the model. In order to allocate monthly reservoir release reasonably the value of weight for hydro-electric energy was assigned by level of power generation hour. The improved model was applied to the five reservoirs system in the Han river. And could be confirmed the availibility of new formulation appling risk evaluation criteria.
A Study on TOPMODEL Simulation for Soil Moisture Variation
Kim, Jin-Hun ; Bae, Deok-Hyo ; Jang, Gi-Hyo ; Jo, Cheon-Ho ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 65~75
DOI : 10.3741/JKWRA.2002.35.1.065
The objectives of this study are to analyse model-based soil moisture variations depending on model parameters m and
and to evaluate the model performance for the simulation of soil moisture variations by the comparison of observed groundwater levels and model-driven soil moisture amounts and observed and simulated river discharges at the basin outlet. The selected study area is the Pyungchang IHP river basin with outlet at Sanganmi station and the summer flooding events during '94-'98 are used for the analysis. As a result, soil moisture holding capacity is increased according to increase the parameter m that represents effective groundwater depth. This phenomenon is especially dominant when higher m and
values are used. The qualitative comparison of computed base flow and observed groundwater level shows that the base flow peaks are reasonably simulated and the decreasing limbs of hydrograph are mainly caused by base flows. It is concluded that TOPMODEL can be used effectively for simulating basin-averaged soil moisture variations in addition to river flow generations.
A Study on the Hydraulic Characteristics for River Bed Revetments using Mattress
Bae, Sang-Su ; Heo, Chang-Hwan ; Ji, Hong-Gi ; Lee, Sun-Tak ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 77~90
DOI : 10.3741/JKWRA.2002.35.1.077
The condition of initial movement for the river bed revetment using rip rap is a limit condition beyond which the lining is progressively destroyed as the separate elements are removed by the flow. In the case of the river bed revetment using mattress, however, after the initial movement the containment offered by the mesh remains. A new situation of equilibrium with a deformed river bed revetment using mattress is obtained, allowing it to withstand more severe conditions without compromising the resistance and without further bed deformation. Shield's coefficient for the river bed revetment using mattress is twice the value of that for the river bed revetment using rip rap. This means that with the same hydraulic behavior conditions, the average dimension of the rocks to be used in the river bed revetment using mattress is half that of the river bed revetment using rip rap rock. When the same size rocks are used the allowable velocity for the river bed revetment using mattress is more than twice, even as much as 3 or 4 times that for the river bed revetment using rip rap.
Bragg Reflection of Obliquely Incident Waves
Jo, Yong-Sik ; An, Yeong-Chang ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 91~96
DOI : 10.3741/JKWRA.2002.35.1.091
The present research describes the Bragg reflection of obliquely incident waves propagating over sinusoidally varying topographies. A numerical model based on the boundary element method is employed. Wave numbers providing Bragg reflection are calculated and compared to theoretical predictions. The reflection coefficients obtained from this model are also compared with those of the eigenfunction expansion method. A very good agreement is observed.
The Study on the Relationship between Land Use and Groundwater Quality in the Rapidly Urbanized Area
An, Jung-Gi ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 97~108
DOI : 10.3741/JKWRA.2002.35.1.097
The use of land at the time of investigation of groundwater quality in the rapidly urbanized Bu-chon city is classified into 5 categories based on the change process of land use. The difference in groundwater quality according to the land use and its usage period is tested by non-parametric statistical procedures. The seven constituents of water quality with the highly frequent detection in the area for this study are used for the statistical test. The shallow groundwater quality within the areas of the same land use at the time of investigation varies significantly according to the period of land usage. The concentration of KMnO
consumed and hardness is significantly higher in the old residential area (of more than 20 years old) than in the younger one (of less than 10 years old). The quality of the shallow groundwater is also significantly different among the three categories with the similar period of land usage (of more than 15 years old). The concentration of No
-N, hardness and total solid is significantly higher in the residential area than in the agricultural one (namely, the area used as paddy fields 2 to 5 years ago). The median concentration of these constituents is 2.2 to 3.8 times higher in the residential area than in the agricultural one. The concentration of NO
, consumed and Cl is significantly higher in the industrial area than in the agricultural one. The median concentration of these constituents is 5.5 to 18 times higher in the industrial area than in the agricultural one. The concentration of KMnO
consumed is significantly higher in the industrial area than in the residential area. The median concentration of these constituents is 12 times higher in the industrial area than in the residential one. The spatial distribution of shallow groundwater quality in the rapidly urbanized area is closely related to the period of land usage as well as the land use, which is presumed to be attributed to the difference in the concentration and leakage rate of the contaminants leaking from damaged sewer into shallow groundwater.
A Stochastic Model for Precipitation Occurrence Process of Hourly Precipitation Series
Lee, Jae-Jun ; Lee, Jeong-Sik ;
Journal of Korea Water Resources Association, volume 35, issue 1, 2002, Pages 109~124
DOI : 10.3741/JKWRA.2002.35.1.109
This study is an effort to develop a stochastic model of precipitation series that preserves the pattern of occurrence of precipitation events throughout the year as well as several characteristics of the duration, amount, and intensity of precipitation events. In this study an event cluster model is used to describe the occurrence of precipitation events. A logarithmic negative mixture distribution is used to describe event duration and separation. The number of events within each cluster is also described by the Poisson cluster process. The duration of each event within a cluster and the separation of events within a single cluster are described by a logarithmic negative mixture distribution. The stochastic model for hourly precipitation occurrence process is fitted to historical precipitation data by estimating the model parameters. To allow for seasonal variations in the precipitation process, the model parameters are estimated separately for each month. an analysis of thirty-four years of historical and simulated hourly precipitation data for Seoul indicates that the stochastic model preserves many features of historical precipitation. The seasonal variations in number of precipitation events in each month for the historical and simulated data are also approximately identical. The marginal distributions for event characteristics for the historical and simulated data were similar. The conditional distributions for event characteristics for the historical and simulated data showed in general good agreement with each other.