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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Korean Society of Civil Engeneers
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Volume & Issues
Volume 27, Issue 6D - Nov 2007
Volume 27, Issue 6C - Nov 2007
Volume 27, Issue 6B - Nov 2007
Volume 27, Issue 6A - Nov 2007
Volume 27, Issue 5D - Sep 2007
Volume 27, Issue 5C - Sep 2007
Volume 27, Issue 5B - Sep 2007
Volume 27, Issue 5A - Sep 2007
Volume 27, Issue 4D - Jul 2007
Volume 27, Issue 4C - Jul 2007
Volume 27, Issue 4B - Jul 2007
Volume 27, Issue 4A - Jul 2007
Volume 27, Issue 3D - May 2007
Volume 27, Issue 3C - May 2007
Volume 27, Issue 3B - May 2007
Volume 27, Issue 3A - May 2007
Volume 27, Issue 2C - Mar 2007
Volume 27, Issue 2A - Mar 2007
Volume 27, Issue 2D - Mar 2007
Volume 27, Issue 2B - Mar 2007
Volume 27, Issue 1D - Jan 2007
Volume 27, Issue 1C - Jan 2007
Volume 27, Issue 1B - Jan 2007
Volume 27, Issue 1A - Jan 2007
Selecting the target year
A Parameter Regionalization Study of a Modified Tank Model Using Characteristic Factors of Watersheds
Lee, Sang-Ho ; Kang, Shin-Uk ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 379~385
Multiple regression equations were derived to estimate regional parameters of a modified Tank Model with three serial tanks. The regional parameters can be used to compute long term runoff from ungaged watersheds. The Tank Model parameters were estimated for the fifteen watersheds of dam sites and stream stations. A global optimization method of Shuffled Complex Evolution algorithm was found to be more proper than local optimization methods for parameter estimation of the Tank Model. The six watershed characteristic factors are predictor variables of the regression equations. Model verification was performed for the watersheds of Chungju Dam and Seolmacheon using the fitted parameters from the regression equations. The absolute errors of long term runoff from the verification are eight percent or less.
Development of Monthly Operating Rule for Single Reservoir : I. Piecewise-Linear Operating Rule Using Multi-Objective Genetic Algorithm
Kim, Tae-Soon ; Bae, Deg-Hyo ; Heo, Jun-Haeng ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 387~393
Multi-Objective Genetic Algorithm (MOGA) and piecewise-linear operating rule are applied to develop reservoir operating rule for single reservoir. Synthetic inflow is generated using AR (1) time series model and two multi-objectives that are to minimize water shortage and to maximize hydroelectric power production and constraints about terminal storage and water supply demand are used in order to perform MOGA. The 99% nonexceedance and exceedance quantiles are used as maximum and minimum storages to calculate the limits of the first and last endpoints of operating rule, respectively. For the sake of evaluating the performance of the developed operating rule, reservoir operation results are achieved only using the developed operating rule and historical inflow. The results show that the piecewise-linear operating rule is a promising one to be able to apply reservoir operation.
Development of Monthly Operating Rule for Single Reservoir : II. Probabilistic Long-term Reservoir Storage Forecast
Kim, Tae-Soon ; Bae, Deg-Hyo ; Kim, Jin-Hoon ; Heo, Jun-Haeng ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 395~401
The objectives of this study are in order to get appropriate parameters for piecewise-linear operating rule when NSGA-II is applied, to evaluate applicability of the developed operating rule only using historical inflow series, and to provide a probabilistic long-term reservoir storage forecast to the decision maker of reservoir operation. An optimal segment for piecewise-linear operating rule is selected to five with water supply constraint. A total ten different random seeds are used but all the developed operating rules show similar shapes with each other and thus random seed effect is not considerable. The reservoir operation results using historical inflows with each initial storage at the start of year from 2000 to 2006 show a good performance although inflows and initial storages of this period have much different from each other. The probabilistic long-term reservoir storage forecast is provided from the optimization results using the developed piecewise-linear operating rule and 100-year synthetic inflow.
Study on Integrated Assessment of the River Environment Monitoring by Life-Cycle-Assessment (focusing on River Structure, Water Quality, Ecosystem)
Kim, Kook-Il ; Ahn, Won-Sik ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 403~411
In this study, collectively to evaluate the environmental quality of river, It quantified that the comprehensive environmental quality of the construction facilities in river improvement project as well as the existing water ecosystem and the water quality monitoring by indicating the separated environmental quality assessment as a single index. In this study, the water ecosystem was indicated as a single index, a variety of water quality items were integrated into an eutrophication index and the selection of rawsubsidiary materials and construction work in the river improvement project were analyzed using LCA. The comprehensive environmental quality assessment, which was indicated by a single index, was allowed to be used in the analysis of potential environmental impact besides aspects of landscape ecology. Hence, a new monitoring assesment method of environmental quality was applied to this study through case study. In addition, the construction work and maintenance of river facilities, the water quality and the water ecosystem analyzed for the 30years of limited time of model basin. The present study suggest that the changed environmental quality of river after river improvement project can be readily understood by indicating the separated monitoring items as a single index. The results of this study are expected to be effectively utilized for the nature-friendly design of close-to-nature river and the selection of rawsubsidiary materials in river improvement project.
Hydrodynamic Pressure Models for Free Surface Flow
Jang, Won-Jae ; Lee, Seung-Oh ; Lee, Jong-Wook ; Cho, Yong-Sik ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 413~422
Hydrodynamic pressure model and application problems are presented to analyze free surface flow in this study. The governing equations for an unsteady incompressible fluid employ the continuity equation and inviscid Navier-Stokes equation. For the turbulence closed problem, k-e model is employed and turbulence eddy viscosity is resolved. Numerical simulations are conducted in three steps to calculate the velocity component in each direction, the free surface elevations and the hydrodynamic pressures. At the first step, the momentum equations are discretized by using a semi-implicit method over the vertical direction. At the second step, velocity fractional equations with hydrodynamic pressure correction terms are substituted into the continuity equation, which yields an elliptic equation called as the hydrodynamic pressure-Poisson equation. The local mass can be, therefore, conserved by solving that elliptic equation. Finally, the free surface elevation and the final velocities are computed by substituting into the continuity equation. The numerical accuracy is verified by comparing numerical results with analytical solutions of the sloshing free surface movement at a square basin and solitary wave propagation in a rectangular. The overall agreement between calculated and analytical solutions is excellent. Also, numerical calculation for the propagation phase of non-linear wave in submerged bar and wave deformation in elliptic shoal are conducted and results of numerical model show good agreement with experimental data.
Development and Validation of Backrouting Method
Cheong, Tae-Sung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 423~430
The KMoSim is a generalized multi-objective goal programming designed to simultaneously assure that water resources are allocated according to physical, hydrogeological, and institutional/administrative requirements in a river basin. The KModSim is capable of distinguishing between natural flow and various storage contract arrangements for water entitlement accounting, including storage ownership, water service contracts, and rent pool/water banking. The KMoSim is a flexible general river basin modeling tool that both the physical model of the river basin and the operating policy are defined and easily modified by the modeler through an interactive graphical user interface. In contrast with existing optimization tool, the KMoSim automatically generates the parameters related in water resources simulation. In this study, the backrouting method was developed to efficiently solve a multiobjective, linear goal programming formulation of a reservoir system and applied to the Geum River basin for validation. The results show that the simulation results from the KModSim with the backrouting method were better agreement with observed data in the Geum River basin then the results from the KModSim without the backrouting method. It is expected that the backrouting method can be used to reduce the upstream reservoir releases which can satisfy future downstream demands in spite of the time lags in downstream deliveries in the daily network.
Analysis of the Characteristics of Low-flow Behavior Based on Spatial Simulated flows
Kim, Nam-Won ; Lee, Byong-Ju ; Lee, Jeong-Eun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 431~440
The drought flow analysis for small and medium sized river is very difficult because of the scarcity of drought flow observation data. This study concerns the generation of areal simulated flow from SWAT-the semi distributed hydrologic model, the estimation of drought flow and the analysis of its areal characteristics. The SWAT model is set up for the Chungju Dam basin and is verified by comparing the observation-simulation daily flow of Dam site with upper stream station. The specific flow rate of mean drought flow is increased with the area, which is identified from the slope of each subbasin and the areal characteristics of saturated hydraulic conductivity. It is also proved that the drought flow can be overestimated using observed flow data by comparing with previous results. This method can represent more reasonable drought flow than thereby areal-specific flow rate method. The physical characteristics of drought flow also can be evaluated by these results.
On the Flushing Effect and the Likelihood of the Environment Friendly Vertical Breakwater Consisting of Immersed Water Channel and Water Chamber as a Wave Energy Extraction Measure
Cho, Yong-Jun ; Kim, Min-Kyun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 441~453
We numerically analyze the flushing effects and the likelihood of a vertical breakwater consisting of immersed water channel and water chamber, originally proposed by Nakamura (1999, 2003, 2005) for the alleviation of reflected waves, as a wave energy extraction measure. As a wave driver, we use the Nervier-Stokes equations and mass balance equation, and the numerical integration of which is carried out based on the smooth particle hydrodynamics with a Gaussian Kernel function. As a water level in front of curtain wall, where an anti-node of standing wave due to partial reflection is located, approaches its lowest level, a unidirectional flow in the water chamber formed by a preceding wave starts to move offshore. Once it exits a water chamber, this energetic flow feeds necessary energy for the vortex in front of the water chamber to sustain enough time until next wave comes. Considering the facts that an intensity of the flow absorbed through the immersed water channel is strongly proportional with an extent and strength of the vortex formed on offshore side of front curtain wall and a curved path line of sucked water particles, we can deduce that aforementioned vortex is responsible for the flushing effects of the vertical breakwater consist of immersed water channel and water chamber. It is also shown that net flux through the immersed water channel increases as the mass inflow into a water chamber is getting larger (T=1.4sec, Le=6 cm), which also confirm our conclusion.
The Erosion Analysis of the Coastal Beach by the Artificial Reef
Kim, Nam-Hyeong ; Mun, Ji-Won ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 455~460
The numerical analysis of the erosion behavior of coastal beach with the artificial reef has been performed. It is shown that the result is more effective for the case with the artificial reef than without the artificial reef in controlling the beach erosion. And it is also shown that the offshore distance is more important measure than the height and width of the artificial reef. Therefore, the computation results obtained in this study are found to be useful for establishing the total strategy for the protection of the erodible coastal beach.
A Fixed Bed Granular Calcite Column to Treat Hydrofluoric Acid Wastewater
Choe, Won-Ho ; Park, Joo-Yang ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 461~467
This study describes a new fluoride removal process using calcite that can efficiently treat hydrofluoric acid (HF) wastewater discharged from semiconductor industries. In the batch experiments using calcite and lime to treat artificial or real HF wastewater, the residual calcium concentration of calcite was lower than that of lime, and the pH value of calcite was neutral region in contrast to lime in a high pH region, even though the fluoride removal rate of calcite was comparable to that of lime. Continuous experiment using a packed column with granular calcite was performed to observe the successive fluoride removal capacity of calcite. The real HF wastewater concentration of 1,055 mg/L was reduced to the level of less than 15 mg/L, and it was further reduced as low as 7.7 mg/L when flow rate was increased. The effluent pH and calcium were 7~8 and 67~122 mg/L. Some anions were slightly reduced. The total alkalinity of effluent reached the maximum level of 967.1 mg/L (as CaCO3), which was gradually reduced and not detected after breakthrough.
Kinetics of Nitrification and Denitrification in Hybrid Activated Sludge Process
Yoon, Young-Han ; Park, Jae-Roh ; An, Sang-Woo ; Gee, Jae-Sung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 4B, 2007, Pages 469~474
Hybrid Activated Sludge Process (HASP) was developed and applied to an activated sludge process for advanced nutrient treatment. The characteristics of nitrogen removal from the HASP was investigated through a kinetic study by batch-type experiment. On-line DB analysis was conducted for the nutrient removal performance in the field demonstration plant treating 10,000 m3 sewage per day in P city. This paper aimed to determine the effect of increasing NH4+-N load on the specific nitrification rate (SNR) and specific denitrification rate (SDNR) through the batch-type experiment and to estimate the net reaction time for the phase-transfer rate by the on-line DB analysis from the HASP manual mode operation. Experimental results include; (1) Both the nitrification and denitrification followed first-order kinetics. (2) The maximum SNR and SDNR were 4.0308 mgN/gVSS?hr and 2.7852 mgN/gVSS?hr, respectively. (3) Comparison the phase-transfer rates between nitrification and denitrification from the on-line DB analysis found that nitrification rate was higher than denitrification. It was concluded that increase in denitrification rate can enhance overall nitrogen removal rate in the HASP operation.