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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
Application of Rainfall Runoff Model with Rainfall Uncertainty
Lee, Hyo-Sang ; Jeon, Min-Woo ; Balin, Daniela ; Rode, Michael ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 773~783
DOI : 10.3741/JKWRA.2009.42.10.773
The effects of rainfall input uncertainty on predictions of stream flow are studied based extended GLUE (Generalized Likelihood Uncertainty Estimation) approach. The uncertainty in the rainfall data is implemented by systematic/non-systematic rainfall measurement analysis in Weida catchment, Germany. PDM (Probability Distribution Model) rainfall runoff model is selected for hydrological representation of the catchment. Using general correction procedure and DUE(Data Uncertainty Engine), feasible rainfall time series are generated. These series are applied to PDM in MC(Monte Carlo) and GLUE method; Posterior distributions of the model parameters are examined and behavioural model parameters are selected for simplified GLUE prediction of stream flow. All predictions are combined to develop ensemble prediction and 90 percentile of ensemble prediction, which are used to show the effects of uncertainty sources of input data and model parameters. The results show acceptable performances in all flow regime, except underestimation of the peak flows. These results are not definite proof of the effects of rainfall uncertainty on parameter estimation; however, extended GLUE approach in this study is a potential method which can include major uncertainty in the rainfall-runoff modelling.
Probability of Pipe Breakage for Pipe Network with Surge Tank regarding Unsteady Effect
Kwon, Hyuk-Jae ; Lee, Cheol-Eung ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 785~793
DOI : 10.3741/JKWRA.2009.42.10.785
Numerical model which can simulate the surge tank for unsteady flow was developed in the present study. Furthermore, reliability model which can calculate the probability of pipe breakage regarding unsteady effect was developed. For the risk estimation of pipe breakage and functional estimation of surge tank, probability of pipe breakage for pipe network with surge tank was calculated regarding unsteady effect. From the results, it was found that unsteady flow significantly increase the probability of pipe breakage and surge tank considerably decrease probability of pipe breakage as damping out the pressure oscillations.
A Statistical Homogeneity Analysis of Seoul Rainfall using Bootstrap
Hwang, Seok-Hwan ; Kim, Joong-Hoon ; Yoo, Chul-Sang ; Jung, Sung-Won ; Yoo, Do-Guen ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 795~807
DOI : 10.3741/JKWRA.2009.42.10.795
In this study, homogeneity analysis was performed between rainfall observation data set of Chukwooki (CWK) and rainfall observation data set of modern rain gage (MRG) using Bootstrap method. Since traditional statistical homogeneity test method are validated only when distribution of their population is known, meteorological data which their statistical distributions of population are complicated were difficult to verify the homogeneity and there were plenty of room for doubt for their statistical significance using historical method. In this reason, in this study homogeneity test was evaluated between two data sets using bootstrap method which is not necessary to infer distribution of population. The test results show that there was an statistical homogeneity between CWK and MRG except for slight impact of climatical trend.
Application to Evaluation of Hydrologic Time Series Forecasting for Long-Term Runoff Simulation
Yoon, Sun-Kwon ; Ahn, Jae-Hyun ; Kim, Jong-Suk ; Moon, Young-Il ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 809~824
DOI : 10.3741/JKWRA.2009.42.10.809
Hydrological system forecasting, which is the short term runoff historical data during the limited period in dam site, is a conditional precedent of hydrological persistence by stochastic analysis. We have forecasted the monthly hydrological system from Andong dam basin data that is the rainfall, evaporation, and runoff, using the seasonal ARIMA (autoregressive integrated moving average) model. Also we have conducted long term runoff simulations through the forecasted results of TANK model and ARIMA+TANK model. The results of analysis have been concurred to the observation data, and it has been considered for application to possibility on the stochastic model for dam inflow forecasting. Thus, the method presented in this study suggests a help to water resource mid- and long-term strategy establishment to application for runoff simulations through the forecasting variables of hydrological time series on the relatively short holding runoff data in an object basins.
Assessment of the Potential Water Supply Rate of Agricultural Irrigation Facilities Using MODSIM - For Geum River Basin -
Ahn, So-Ra ; Park, Geun-Ae ; Shin, Young-Ho ; Kim, Seong-Joon ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 825~843
DOI : 10.3741/JKWRA.2009.42.10.825
To prepare for agricultural droughts, the potential discharge to the water supply of irrigation facilities during drought periods is important. Using the MODSIM (Modified SIMYLD) model, water balance networks that consider irrigation facilities were designed for the Geum River Basin, and the potential discharge to the agricultural water supply of irrigation facilities were evaluated by running the model using data for 36 years (1967-2002). It was found that agricultural water deficiencies occurred during the drought years more than in the other years. The agricultural water deficiencies in 1994, 1995, and 2001, the representative drought years, were 745.8 million m
, 661.1 million m
, and 696.8 million m
, respectively. The average potential discharge to the water supply of the sub-basin was 99.1 % in the cases of municipal and industrial water, and 84.4 % in the case of agricultural water. The potential discharge to the water supply in 1994, 1995, and 2001 were 74.8 %, 79.2 %, and 77.9 %, respectively, which are lower than those of the other years` sub-basin average. In the analysis of the contribution of each irrigation facility, the contributions of pumping stations and diversions were calculated as 32.5 %, and of culverts and wells, 4.0 %. During the drought periods, the pumping stations and diversions contributed to a certain level.
Analysis of Bed Material Changes by Flushing Flow from Daecheong Dam
Jang, Chang-Lae ; Woo, Hyo-Seop ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 845~855
DOI : 10.3741/JKWRA.2009.42.10.845
In this study, changing characteristics of bed materials downstream of Daecheong Dam by flushing flow was investigated. Flushing flow affected the downstream environment in such a way that the mean diameter of bed material was increased and the standard deviation was decreased. The vertical sorting of bed materials composed of mixed sediment in the sediment box was observed. The surface layer was composed of gravels, and uniform sand material was buried below it. Relative fractions (Di/D50) of the bed material trapped in the box was nearly 1.0 for the bed material coarser than D
at Hyundo gauging station, and was between two values on the bed surface before and after the flushing flow at Bugang gauging station. Ratio of driving force to resisting force for each fraction (
) with the faction size maintained constant for the bed material coarser than D
at Hyundo station. At Bugang station, however, it was rapidly decreased. It means that pavement of the surface layer of bed material at Bugang station was developed, with the sediment particles moving downstream uniformly by flushing flow.
Application of Jackknife Method for Determination of Representative Probability Distribution of Annual Maximum Rainfall
Lee, Jae-Joon ; Lee, Sang-Won ; Kwak, Chang-Jae ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 857~866
DOI : 10.3741/JKWRA.2009.42.10.857
In this study, basic data is consisted annual maximum rainfall at 56 stations that has the rainfall records more than 30years in Korea. The 14 probability distributions which has been widely used in hydrologic frequency analysis are applied to the basic data. The method of moments, method of maximum likelihood and probability weighted moments method are used to estimate the parameters. And 4-tests (chi-square test, Kolmogorov-Smirnov test, Cramer von Mises test, probability plot correlation coefficient (PPCC) test) are used to determine the goodness of fit of probability distributions. This study emphasizes the necessity for considering the variability of the estimate of T-year event in hydrologic frequency analysis and proposes a framework for evaluating probability distribution models. The variability (or estimation error) of T-year event is used as a criterion for model evaluation as well as three goodness of fit criteria (SLSC, MLL, and AIC) in the framework. The Jackknife method plays a important role in estimating the variability. For the annual maxima of rainfall at 56 stations, the Gumble distribution is regarded as the best one among probability distribution models with two or three parameters.
A Study on the Temporal Variation of Hydraulic Characteristics by the Stage-Discharge Relation Curve - at Jeokpogyo, Jindong of the Nakdong River -
Lee, Jae-Joon ; Seol, Ji-Su ; Kwak, Chang-Jae ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 867~876
DOI : 10.3741/JKWRA.2009.42.10.867
In this study, the stage-discharge relation curve made in 2006 is selected with standard curves to seize the hydraulic and geometric characteristics for the temporal variation of the river bed. The relationships among the standard stage-discharge relation curve and the existing stage-discharge relation curves, water level, cross sectional area, and flow velocity are analyzed. Jeokpogyo and Jindong which are the key station of Nakdong river are chosen for the study, with respect to the current river bed to convert the existing stage-discharge curves. The relationships for conversion of previous data, between water level and flow velocity are got. Also the relation equation between water level and cross sectional area and water level, flow velocity are derived. These conversion relationships shows good agreement between observed values and estimated values. It will be very useful to convert past hydraulic quantitations to current one.
Watershed Modeling for Assessing Climate Change Impact on Stream Water Quality of Chungju Dam Watershed
Park, Jong-Yoon ; Park, Min-Ji ; Ahn, So-Ra ; Kim, Seong-Joon ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 877~889
DOI : 10.3741/JKWRA.2009.42.10.877
This study is to assess the future potential impact of climate change on stream water quality for a 6,581.1 km
dam watershed using SWAT (Soil and Water Assessment Tool) model. The ECHAM5-OM climate data of IPCC (The Intergovernmental Panel on Climate Change) A2, A1B, and B1 emission scenarios were adopted and the future data (2007-2099) were corrected using 30 years (1977-2006, baseline period) weather data and downscaled by Change Factor (CF) method. After model calibration and validation using 6 years (1998-2003) observed daily streamflow and monthly water quality (SS, T-N, and T-P) data, the future (2020s, 2050s and 2080s) hydrological behavior and stream water quality were projected.
Simulation of Mixing Behavior for Dredging Plume using Puff Model
Kim, Young-Do ; Park, Jae-Hyeon ; Lee, Man-Soo ;
Journal of Korea Water Resources Association, volume 42, issue 10, 2009, Pages 891~896
DOI : 10.3741/JKWRA.2009.42.10.891
The puff models have been developed to simulate the advection-diffusion processes of dredging suspended solids, either alone or in combination with Eulerian models. Computational efficiency and accuracy are of prime importance in designing these hybrid approaches to simulate a pollutant discharge, and we characterize two relatively simple Lagrangian techniques in this regard: forward Gaussian puff tracking (FGPT), and backward Gaussian puff tracking (BGPT). FGPT and BGPT offer dramatic savings in computational expense, but their applicability is limited by accuracy concerns in the presence of spatially variable flow or diffusivity fields or complex no-flux or open boundary conditions. For long simulations, particle and/or puff methods can transition to an Eulerian model if appropriate, since the relative computational expense of Lagrangian methods increases with time for continuous sources. Although we focus on simple Lagrangian models that are not suitable to all environmental applications, many of the implementation and computational efficiency concerns outlined herein would also be relevant to using higher order particle and puff methods to extend the near field.