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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 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
Priority Decision of Small Hydropower Development using Spatial Multi-Criteria Decision Making
Kim, Gil-Ho ; Yi, Choong-Sung ; Yeo, Gyu-Dong ; Shim, Myung-Pil ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1029~1038
DOI : 10.3741/JKWRA.2009.42.12.1029
Recently, it is expected that small hydropower (SHP) could potentially provide sufficient amounts of alternative energy in Korea where there is an abundance of potential sites and where social efforts are being made to reduce the emissions of green house gases. In the past, the resources survey for SHP development has been carried out using onsite surveys and paper maps, which incurred a great deal of time and cost. Furthermore, the tools for decision making such as determining development priorities or evaluating feasibility have been considered only economic aspect and focused on the performance characteristics of power generation. However, as the concept of sustainable development has been being advanced in recent years, especially focused on human-social, environmental and ecological in addition to economical sector; the consideration of these multiple criteria has become essential for sustainable SHP development. This study aims to propose the spatial multi-criteria decision making (MCDM) methodology for determining priorities among a number of locations on the planning stage of SHP development using AHP and GIS. The proposed methodology is applied for determining development priorities among the SHP locations in Cho River basin and this study presents the detailed spatial information data and the results of development priorities. As a fundamental work, this study will be beneficial to the future activation of SHP development and will help the decision making in evaluating the feasibility of SHP development.
A Method to Evaluate the Radar Rainfall Accuracy for Hydrological Application
Bae, Deg-Hyo ; Phuong, Tran Ahn ; Yoon, Seong-Sim ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1039~1052
DOI : 10.3741/JKWRA.2009.42.12.1039
Radar measurement with high temporal and spatial resolutions can be a valuable source of data, especially in the areas where rain gauge installment is not practical. However, this kind of data brings with it many errors. The objective of this paper is to propose a method to evaluate statistically the quantitative and qualitative accuracy at different radar ranges, temporal intervals and raingage densities and use a bias adjustment technique to improve the quality of radar rainfall for the purpose of hydrological application. The method is tested with the data of 2 storm events collected at Jindo (S band) and Kwanak (C band) radar stations. The obtained results show that the accuracy of radar rainfall estimation increases when time interval rises. Radar data at the shorter range seems to be more accurate than the further one, especially for C-band radar. Using the Monte Carlo simulation experiment, we find out that the sampling error of the bias between radar and gauge rainfall reduces nonlinearly with increasing raingage density. The accuracy can be improved considerably if the real-time bias adjustment is applied, making adjusted radar rainfall to be adequately good to apply for hydrological application.
2-D SU/PG Finite Element Model Using Quadratic Elements
Choi, Seung-Yong ; Kim, Byung-Hyun ; Kim, Sang-Ho ; Han, Kun-Yeun ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1053~1067
DOI : 10.3741/JKWRA.2009.42.12.1053
The objective of this study is to develop an efficient and accurate quadratic finite element model based on Streamline Upwind/Petrov Galerkin (SU/PG) scheme for analyzing and predicting two dimensional flow features in complex natural rivers. For a development of model, quadratic tin, quadrilateral and mixed elements as well as linear tin, quadrilateral and mixed elements were used in the model. Also, this model was developed through reinforcement of Gauss Quadrature which was necessary to integral of governing equation. Several tests for bottom-rising channel and U-type channel were performed for the purpose of validation and verification of the developed model. Such results showed that solutions of second order elements are better accurate and improved than those of linear elements. Results obtained by the developed model and RMA-2 model are compared, and the results for the developed model were better accurate than those of RMA-2 model. In the future if the developed model is applied in natural rivers, it can provide better accurate results than those of existing model.
The Characteristics of Runoff for Hwacheon dam watershed
Kim, Nam-Won ; Lee, Jeong-Eun ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1069~1077
DOI : 10.3741/JKWRA.2009.42.12.1069
Lately, it is an important concern in water resources research to maintain a stable water supply according to a future climate change and an increase in water use. In Han-River basin, approximately 10 % of water resources that is provided the capital region (Gyeonggi, Seoul etc.) has been reduced as a consequence of the construction of Imnam Dam (storage volume: 27 billion
) located in the upper Hwacheon Dam upstream area. Therefore, streamflows have decreased in Bukhangang basin, but it could not be evaluated quantitatively. In this study, SWAT-K which is the physically based long-term runoff simulation model, was used in order to evaluate the effect of Imnam Dam on the reduced inflow to Hwacheon Dam according to the change of hydrological condition in the upstream area of Hwacheon Dam. For the model input data of North Korea area, meteorological data of GTS (Global Telecommunication System) were used, and soil maps by FAO/UNESCO (2003) were applied. Temporal variations of water resources is investigated with comparison of observed and simulated inflows at Hawcheon Dam site. Also, annual, monthly, seasonal decreases in water resources were evaluated using the flow duration analysis of simulated streamflows with or without Imnam dam.
Handling Method for Flux and Source Terms using Unsplit Scheme
Kim, Byung-Hyun ; Han, Kun-Yeon ; Kim, Ji-Sung ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1079~1089
DOI : 10.3741/JKWRA.2009.42.12.1079
The objective of this study is to develop the accurate, robust and high resolution two-dimensional numerical model that solves the computationally difficult hydraulic problems, including the wave front propagation over dry bed and abrupt change in bathymetry. The developed model in this study solves the conservative form of the two-dimensional shallow water equations using an unsplit finite volume scheme and HLLC approximate Riemann solvers to compute the interface fluxes. Bed-slope term is discretized by the divergence theorem in the framework of FVM for application of unsplit scheme. Accurate and stable SGM, in conjunction with the MUSCL which is second-order-accurate both in space and time, is adopted to balance with fluxes and source terms. The exact C-property is shown to be satisfied for balancing the fluxes and the source terms. Since the spurious oscillations in second-order schemes are inherent, an efficient slope limiting technique is used to supply TVD property. The accuracy, conservation property and application of developed model are verified by comparing numerical solution with analytical solution and experimental data through the simulations of one-dimensional dam break flow without bed slope, steady transcritical flow over a hump and two-dimensional dam break flow with a constriction.
Effect of Climate Change and Urbanization on Flow and BOD Concentration Duration Curves
Park, Kyung-Shin ; Chung, Eun-Sung ; Kim, Sang-Ug ; Lee, Kil-Seong ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1091~1102
DOI : 10.3741/JKWRA.2009.42.12.1091
This study developed an integrated approach to climate change and urbanization impact assessment by linking models of SDSM (statistical downscaling model), HSPF (hydrological simulation program?Fortran) and ICM (impervious cover model). A case study of the Anyangcheon watershed illustrated how the proposed framework can be used to analyze the impacts of climate change and urbanization in terms of flood control, water security and water quality. The evaluation criteria were the variations of flow and pollutant concentration duration curves. In this study, nine scenarios including three climate (present condition, A1B and A2) and three urbanization scenarios were analyzed using HSPF model. As a result, climate change is a large influence on the flowrate and the urbanization affects the pollutant concentration. Therefore, the impacts of both climate change and urbanization must be included into the watershed management and water resources planning for sustainable development.
Effectiveness Analysis of Alternatives for Water Resources Management Considering Climate Change and Urbanization
Park, Kyung-Shin ; Chung, Eun-Sung ; Kim, Sang-Ug ; Lee, Kil-Seong ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1103~1111
DOI : 10.3741/JKWRA.2009.42.12.1103
This study derived the analysis results of alternatives for integrated watershed management under urbanization and climate change scenarios. Climate change and urbanization scenarios were obtained by using SDSM (Statistical Downscaling Method) model and ICM (Impervious Cover Model), respectively. Alternatives for the Anyangcheon watershed are reuse of wastewater treatment plant effluent, and redevelopment of existing reservoir. Flow and BOD concentration duration curves were derived by using HSPF (Hydrological Simulation Program - Fortran) model. As a result, low flow (
) and BOD concentration (
) were very sensitive to the alternatives comparing to high flow(
). Although urbanization makes the hydrological cycle distorted, effective alternatives can reduce its damage. The numbers of days to satisfy the instreamflow requirements and target water quality were also sensitive to urbanization. This result showed that the climate change and urbanization should be considered in the water resources/watershed and environmental planning.
Evaluation of Channel-forming Discharge for the Abandoned Channel Restoration Design of Cheongmi Stream
Ji, Un ; Kang, Jun-Gu ; Yeo, Woon-Kwang ; Han, Seung-Won ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1113~1124
DOI : 10.3741/JKWRA.2009.42.12.1113
The abandoned channel restoration is one of methods to enhance the environmental function and ecological habitat as well as the functions of water-utilization and flood control. The channel-forming or dominant discharge must be evaluated and defined to design the cross-sectional and plane geometries of the stable and equilibrium channel for the abandoned channel restoration project. In general, bankfull discharge, specified recurrence interval discharge, and effective discharge have been used to decide the channel-forming discharge. In this study, bankfull discharge, specified recurrence interval discharge, and effective discharge were calculated and compared for the abandoned channel restoration site of Cheongmi Stream and their relations to historical bed changes were analyzed. The bankfull discharge, 488
, of the abandoned channel restoration site of Cheongmi Stream was calculated using HEC-RAS data and ranged between 1.5-year and 2-year recurrence discharges. Also, the effective discharge evaluated with the sediment rating curve and mean daily discharge data is greater than the bankfull discharge. According to the survey data of 1994 and 2008, the bed elevation of the study reach was decreased over time. It is indicated that the channel bed is changing to the stable condition to allow the effective discharge.
Effects of evanescent modes on three-dimensional depression of seabed
Jung, Tae-Hwa ; Kim, Hyung-Joon ; Cho, Yong-Sik ;
Journal of Korea Water Resources Association, volume 42, issue 12, 2009, Pages 1125~1133
DOI : 10.3741/JKWRA.2009.42.12.1125
Evanescent modes which are the other solutions of the Laplace equation for the linear dispersion equation may affect the wave transformation especially when a water depth varies abruptly. In this study, the effects of evanescent modes for a three-dimensional depression of seabed are investigated by using the eigenfunction expansion method. A convergence test is first carried out by changing numbers of domains and evanescent modes. The wave transformation for various depressions of seabed is then calculated under condition that the solution of the eigenfunction expansion method is converged.