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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 40, Issue 12 - Dec 2007
Volume 40, Issue 11 - Nov 2007
Volume 40, Issue 10 - Oct 2007
Volume 40, Issue 9 - Sep 2007
Volume 40, Issue 8 - Aug 2007
Volume 40, Issue 7 - Jul 2007
Volume 40, Issue 6 - Jun 2007
Volume 40, Issue 5 - May 2007
Volume 40, Issue 4 - Apr 2007
Volume 40, Issue 3 - Mar 2007
Volume 40, Issue 2 - Feb 2007
Volume 40, Issue 1 - Jan 2007
Selecting the target year
Effect of Combined Rainfall Observation with Radar and Rain Gauge
Yoo, Chul-Sang ; Kim, Kyoung-Jun ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 841~849
DOI : 10.3741/JKWRA.2007.40.11.841
This study evaluated the effect of combined rainfall observation of using rain gauge and rain radar. The effect of combined observations is to be evaluated by considering the decrease of measurement error due to combined use of design orthogonal observation methods. As an example, this study evaluated the rain gauge network of the Keum river basin, and showed how the density of rain gauges could be decreased by combining the radar observation. This study applied the researches on sampling error by North and Nakamoto(1989), Yoo et al. (1996) and Yoo (1997), also the simple NFD model for representing the rainfall field. The model parameters were decided using the rainfall characteristics (correlation time and length) estimated using the data collected in the Keum River Basin by 28 rain gauges and the operation rule of radar was assumed arbitrarily. This study considered the rain gauge density criteria provided by WMO(1994) and the rain gauge density installed in the Keum river basin to decrease the rain gauge density under the condition of introducing the radar.
Evaluation for usefulness of Chukwookee Data in Rainfall Frequency Analysis
Kim, Kee-Wook ; Yoo, Chul-Sang ; Park, Min-Kyu ; Kim, Hyeon-Jun ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 851~859
DOI : 10.3741/JKWRA.2007.40.11.851
In this study, the chukwookee data were evaluated by applying that for the historical rainfall frequency analysis. To derive a two parameter log-normal distribution by using historical data and modem data, censored data MLE and binomial censored data MLE were applied. As a result, we found that both average and standard deviation were all estimated smaller with chukwookee data then those with only modern data. This indicates that rather big events rarely happens during the period of chukwookee data then during the modern period. The frequency analysis results using the parameters estimated were also similar to those expected. The point to be noticed is that the rainfall quantiles estimated by both methods were similar. This result indicates that the historical document records like the annals of Chosun dynasty could be valuable and effective for the frequency analysis. This also means the extension of data available for frequency analysis.
Willingness to Pay for Residential Water on Drought Conditions
Park, Doo-Ho ; Park, Yoon-Shin ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 861~867
DOI : 10.3741/JKWRA.2007.40.11.861
This Research analyzes the consumers' willingness to pay(WTP) for residential water on severe drought condition. The 7 large cities and 32 chronicle drought regions have been selected for this research survey. Results show that the consumers of large cities, which are relatively rich, think water quality is more important than quantity, but the consumers of 32 chronicle drought regions expressed just opposite. Dichotomous choice and open-ended questionnaire are mixed for the survey and Tobit model is applied in the analysis. As we expected, the higher the education level, the number of household member, and the income, the higher the WTP. When there is 25% reduction of supply, the WTP is about $2 per month. Contrary to the expectation, WTP is just slightly increased for 50% of water supply reduction. This is because of the resistance of tax as well as the limited actual experiences of water shortage so, they underestimated it. In any cases, actual WTP for actual water shortage is much higher than this result. More effective water supply and distribution schedule must be ready as a national and local level to prepare severe drought in the near future. Consumers are willing to pay higher price than the current level for water security. Water distributional system should be reconsidered and alternative source of water also be prepared.
The Study on the Marginal Product Value and Price Elasticity of Disaggregated Industrial Water
Min, Dong-Ki ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 869~876
DOI : 10.3741/JKWRA.2007.40.11.869
This paper estimates the output and price elasticities of disaggregated industrial water in order to afford some information for improving the efficiency of government water policy. This paper uses the marginal productivity method for estimating the output and price elasticities of industrial water. The estimated output elasticity shows that the value of industrial water is much higher than the average price of industrial water and the estimated price elasticity shows that the water pricing policy is effective for controlling the demand of industrial water.
Development of a Pump Operation Rule in a Drainage Pump Station using a Real Time Control Model for Urban Drainage System
Lee, Jung-Ho ; Lee, Yang-Jae ; Kim, Joong-Hoon ; Jun, Hwan-Don ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 877~886
DOI : 10.3741/JKWRA.2007.40.11.877
An urban drainage system consists of two major systems : flood drainage facilities and operating practices. The facilities are composed of sewer networks, gates, and pumping stations and the operating practice consists of pump or gate operation. Then, a real time simulation system which is able to simulate urban runoff and the pump operation and to consider the backwater effect is required to operate efficiently the pump. With this system, the efficient pump operating rule can be developed to diminish the possible flood damage on urban areas. In this study, a real time simulation system was developed using the SWMM 5.0 DLL and Visual Basic 6.0 equipped with EXCEL. Also, for developing efficient pump operating Rules, two new Rules were suggested. The first Rule is designed to operate pumps considering the condition of sewer networks such as depths of each junction. The second is to discharge all the amount of inflow at each time step. Results obtained by those Rules were compared with one by the current pump operating Rule which is able to consider only the depth of the retard basin. The developed model was applied to Joonggok retard basin and verified their applicability.
Temporal and Spatial Characteristics of Sediment Yields from the Chungju Dam Upstream Watershed
Kim, Chul-Gyum ; Lee, Jeong-Eun ; Kim, Nam-Won ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 887~898
DOI : 10.3741/JKWRA.2007.40.11.887
A physically based semi-distributed model, SWAT was applied to the Chungju Dam upstream watershed in order to investigate the spatial and temporal characteristics of watershed sediment yields. For this, general features of the SWAT and sediment simulation algorithm within the model were described briefly, and watershed sediment modeling system was constructed after calibration and validation of parameters related to the runoff and sediment. With this modeling system, temporal and spatial variation of soil loss and sediment yields according to watershed scales, land uses, and reaches was analyzed. Sediment yield rates with drainage areas resulted in
excluding some upstream sub-watersheds and showed around 0.51 ton/ha/yr above the areas of
. Annual average soil loss according to land use represented the higher values in upland areas, but relatively lower in paddy and forest areas which were similar to the previous results from other researchers. Among the upstream reaches, Pyeongchanggang and Jucheongang showed higher sediment yields which was thought to be caused by larger area and higher fraction of upland than other upstream sub-areas. Monthly sediment yields at the main outlet showed same trend with seasonal rainfall distribution, that is, approximately 62% of annual yield was generated during July to August and the amount was about 208 ton/yr. From the results, we could obtain the uniform value of sediment yield rate and could roughly evaluate the effect of soil loss with land uses, and also could analyze the temporal and spatial characteristics of sediment yields from each reach and monthly variation for the Chungju Dam upstream watershed.
Analysis of Reflection Coefficients of Waves Propagating over Various Depression of Topography
Kang, Gyu-Young ; Jung, Tae-Hwa ; Cho, Yong-Sik ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 899~908
DOI : 10.3741/JKWRA.2007.40.11.899
In this study, wave reflection due to depression of seabed is calculated by using eigenfunction expansion method. The proper numbers of steps and evanescent modes needed for analysis are suggested by applying the eigenfunction expansion method to bottom topography of which slope or curvature varies. While satisfying shallow or intermediate water depth condition, the optimal figure of depression of seabed is obtained by calculating reflection coefficient for various depressions of seabed. The reflection coefficient with distance between the depression of seabeds is then calculated after arraying the optimal geometry in two and three rows.
Application of Physical Habitat Simulation System (PHABSIM) in the Reach of Small Dam Removal for Zacco platypus
Im, Dong-Kyun ; Jung, Sang-Hwa ; Ahn, Hong-Kyu ; Kim, Kyu-Ho ;
Journal of Korea Water Resources Association, volume 40, issue 11, 2007, Pages 909~920
DOI : 10.3741/JKWRA.2007.40.11.909
River restoration and environmental improvement projects have been peformed by social needs, therefore methodology for evaluating such projects must be provided. The PHysical HABitat SIMulation system (PHABSIM) is proposed as a tool for the assessment of hydraulic habitat suitability for aquatic species related to flow regime in river. This study evaluates the change of physical habitat for Zacco platypus according to small dam removal and the model suitability by applying PHABSIM to the reach where small dam was removed. It is shown that the physical habitat is generally increased and improved where the small dam was removed. However, physical habitat in the spawning stage that has a weak swimming speed is decreased by increased flow velocity in the upstream area of small dam, so proper countermeasure for that condition should be needed. Consequently, PHABSIM can be effectively used to provide methodology for assessment and necessity of various river projects including a removal of out-aged hydraulic structures.