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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Water Resources Association
Journal Basic Information
Journal DOI :
Korea Water Resources Association
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Volume & Issues
Volume 39, Issue 12 - Dec 2006
Volume 39, Issue 11 - Nov 2006
Volume 39, Issue 10 - Oct 2006
Volume 39, Issue 9 - Sep 2006
Volume 39, Issue 8 - Aug 2006
Volume 39, Issue 7 - Jul 2006
Volume 39, Issue 6 - Jun 2006
Volume 39, Issue 5 - May 2006
Volume 39, Issue 4 - Apr 2006
Volume 39, Issue 3 - Mar 2006
Volume 39, Issue 2 - Feb 2006
Volume 39, Issue 1 - Jan 2006
Selecting the target year
A Study on Roughness Coefficient Estimations in Gravel Bed Stream without Water Level-Discharge Data
Lee, Sin-Jae ; Park, Sang-Woo ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 985~996
DOI : 10.3741/JKWRA.2006.39.12.985
This study developed a model that could calculate equivalent roughness using shear stress acting on distributed grains in gravel bed stream. The estimated equivalent roughness by the model developed was used for estimation of water level and roughness coefficient in the stream without water level-discharge data. The model was applied to the Gurey-Songjeong stage station section located in the Sumjin river mid-downstream. The equivalent roughness by the model developed in this study was estimated to be 0.194m at the Gurey stage station. Calculated water level which the estimated equivalent roughness was applied to the flow model was shown ewer of within 6% in comparison with observed water level. Also, roughness coefficient was estimated using observed and calculated water level about each discharge scale by unsteady flow analysis. As a result, error of roughness coefficient estimated by observed and calculated water level was shown error of
and could consider variability of roughness coefficient.
Nonlinear Autoregressive Modeling of Southern Oscillation Index
Kwon, Hyun-Han ; Moon, Young-Il ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 997~1012
DOI : 10.3741/JKWRA.2006.39.12.997
We have presented a nonparametric stochastic approach for the SOI(Southern Oscillation Index) series that used nonlinear methodology called Nonlinear AutoRegressive(NAR) based on conditional kernel density function and CAFPE(Corrected Asymptotic Final Prediction Error) lag selection. The fitted linear AR model represents heteroscedasticity, and besides, a BDS(Brock - Dechert - Sheinkman) statistics is rejected. Hence, we applied NAR model to the SOI series. We can identify the lags 1, 2 and 4 are appropriate one, and estimated conditional mean function. There is no autocorrelation of residuals in the Portmanteau Test. However, the null hypothesis of normality and no heteroscedasticity is rejected in the Jarque-Bera Test and ARCH-LM Test, respectively. Moreover, the lag selection for conditional standard deviation function with CAFPE provides lags 3, 8 and 9. As the results of conditional standard deviation analysis, all I.I.D assumptions of the residuals are accepted. Particularly, the BDS statistics is accepted at the 95% and 99% significance level. Finally, we split the SOI set into a sample for estimating themodel and a sample for out-of-sample prediction, that is, we conduct the one-step ahead forecasts for the last 97 values (15%). The NAR model shows a MSEP of 0.5464 that is 7% lower than those of the linear model. Hence, the relevance of the NAR model may be proved in these results, and the nonparametric NAR model is encouraging rather than a linear one to reflect the nonlinearity of SOI series.
Development and Verification of Inundation Modeling with Urban Flooding Caused by the Surcharge of Storm Sewers
Kim, Ji-Sung ; Han, Kun-Yeun ; Lee, Chang-Hee ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 1013~1022
DOI : 10.3741/JKWRA.2006.39.12.1013
Urban flooding is usually caused by the surcharge of storm sewers. For this reason, previous studies on urban flooding are mainly concentrated on the simulation of urban drainage systems. However these approaches that find the pipes which have insufficient drainage capacity are very approximate and unreasonable ways in establishing both flood prevention and flood-loss reduction planning. In this study, a two-dimensional model linked the existing ILLUDAS model is developed to calculate the accurate and resonable solution about urban flood inundation and it is verified by using the simulation of July 2001 flood in Seoul. In the urban area with a small difference of ground elevations, the two-dimensional flood propagation phases must be considered to make a accurate analysis for inundated area and depth. The result of this study can be used to construct fundamental data for a flood control plan and establish a urban flood forecasting/warning system.
The Vertical Distribution of Longitudinal Velocity in Sharp Open Channel Bends
Lee, Kil-Seong ; Kim, Tae-Won ; Park, Jae-Hyeon ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 1023~1030
DOI : 10.3741/JKWRA.2006.39.12.1023
The characteristics of the longitudinal velocity in a
constant-radius, recirculating laboratory channel were investigated. Three-dimensional velocity fields were measured using a side-looking ADV. The shortcomings of existing equations for longitudinal velocity are discussed. An eddy viscosity model is adopted in the downstream momentum equation. A mathematical equation was developed to describe the vertical distribution of longitudinal velocity. The comparisons of the longitudinal velocity show generally good agreement. It is found that the curvature change in the curved channel affects the vertical location of maximum velocity and the vertical profile of longitudinal velocity.
Estimating Attributes Value of Alternatives Applied for Rehabilitation of Hydrologic Cycle of the Anyangcheon Watershed
Kong, Ki-Seo ; Chung, Eun-Sung ; Lee, Kil-Seong ; Yoo, Jin-Chae ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 1031~1042
DOI : 10.3741/JKWRA.2006.39.12.1031
In recent years, a growing concern exists in watershed and stream improvement projects. Under these circumstances, this paper estimates monetary value of the attributes of alternatives for rehabilitation of hydrologic cycle using choice experiments. Choice experiments shows vivid image and estimates a willingness to pay based on their preference for environmental goods. A preliminary survey shows that the attributes of the Anyangcheon watershed are flood-damage possibilities, Instreamflow, water quality, river characteristic and estimates the tax for the Anyangcheon watershed improvements. We surveyed 200 citizens were selected as samples of watershed beneficing in Seoul and Gyeonggi Province and used conditional logit model to analyze the implicit values of the attributive per household. The benefit of the attributes by province based on the implicit price obtained from estimated parameters were calculated. This study is expected to contribute to the decision-making process for policy-makers by providing useful methodological framework and quantitative information related to watershed improvement projects.
A study on the regional climate change scenario for impact assessment on water resources
Im, Eun-Soon ; Kwon, Won-Tae ; Bae, Deg-Hyo ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 1043~1056
DOI : 10.3741/JKWRA.2006.39.12.1043
Our ultimate purpose is to investigate the potential change in regional surface climate due to the global warming and to produce higher quality regional surface climate information over the Korean peninsula for comprehensive impact assessment. Toward this purpose, we carried out two 30-year long experiments, one for present day conditions (covering the period 1971-2000) and one for near future climate conditions (covering the period 2021-2050) with a regional climate model (RegCM3) using a one-way double-nested system. In order to obtain the confidence in a future climate projection, we first verify the model basic performance of how the reference simulation is realistic in comparison with a fairly dense observation network. We then examine the possible future changes in mean climate state as well as in the frequency and intensity of extreme climate events to be derived by difference between climate condition as a baseline and future simulated climate states with increased greenhouse gas. Emphasis in this study is placed on the high-resolution spatial/temporal aspects of the climate change scenarios under different climate settings over Korea generated by complex topography and coastlines that are relevant on a regional scale.
Valuing the Economic Benefits from the Residential Water Supply In Seoul
Yoo, Seung-Hoon ; Park, Kwang-Sup ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 1057~1066
DOI : 10.3741/JKWRA.2006.39.12.1057
Water is an indispensable input to human`s existence and industrial production. A water supply project would demand considerable costs, but produce economic benefits, which are importantly utilized in the project evaluation. In this situation, this study attempts to value the economic benefits from the residential water supply in Seoul. In particular, yearly consumer surplus and economic value of water supply for eleven water authority agencies in Seoul are measured during the period 2001-2004. Information on price elasticity required in calculating consumer surplus is obtained from direct estimation of the residential water demand function, and the consumer surplus is assessed by using a recently developed formula. Price elasticities used here are -0.810 and -1.011, and the estimated consumer surplus and economic value amount to 131.9 to 164.6 billion won and 398.6 to 431.3 billion won, respectively.
Investment Ranking Decision Using MCDA in Dam Projects
Kim, Woo-Gu ; Lee, Gwang-Man ; Park, Doo-Ho ;
Journal of Korea Water Resources Association, volume 39, issue 12, 2006, Pages 1067~1080
DOI : 10.3741/JKWRA.2006.39.12.1067
In empirical evaluations of public projects and public provided goods, MCDA(multicriteria decision-making analysis) has helped decision makers with an adequate policy decision-making tool since it allows taking into account a wide range of assessment criteria. As a tool for decision-making of conflict management, MCDA has demonstrated its usefulness in many public projects such as road, dam and harbor construction. In this study, to use this merit of MCDA, dam project assessment indicators from points of social, economic, environmental and practical views are developed based on sustainable development of water resources, and weighting factors are also estimated by means of questionnaire survey. In order to decide project investment rank, developed evaluation indicators are applied to 6 existing dams under investigation for a rehabilitation project. In addition to, it is recognized that the project practicability has become more important indicator as well as environmental and social issues. This is because cooperation and support from a local government and people are regarded as one of the most important problems in public projects recently.