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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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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 24, Issue 6D - Nov 2004
Volume 24, Issue 6C - Nov 2004
Volume 24, Issue 6B - Nov 2004
Volume 24, Issue 6A - Nov 2004
Volume 24, Issue 5D - Sep 2004
Volume 24, Issue 5C - Sep 2004
Volume 24, Issue 5B - Sep 2004
Volume 24, Issue 5A - Sep 2004
Volume 24, Issue 4D - Jul 2004
Volume 24, Issue 4C - Jul 2004
Volume 24, Issue 4B - Jul 2004
Volume 24, Issue 4A - Jul 2004
Volume 24, Issue 3D - May 2004
Volume 24, Issue 3C - May 2004
Volume 24, Issue 3B - May 2004
Volume 24, Issue 3A - May 2004
Volume 24, Issue 2D - Mar 2004
Volume 24, Issue 2C - Mar 2004
Volume 24, Issue 2B - Mar 2004
Volume 24, Issue 2A - Mar 2004
Volume 24, Issue 1D - Jan 2004
Volume 24, Issue 1C - Jan 2004
Volume 24, Issue 1B - Jan 2004
Volume 24, Issue 1A - Jan 2004
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Runoff Characteristics Analysis of Urban Runoff Experiment Catchment due to Application of Urban Runoff Models
Seo, Kyu-Woo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 521~528
The object of this study is calibration of parameter for application of urban runoff model at experiment catchment. The location of test basin is Dong-eui University, gaya dong, busan, Korea. For the collecting of basic hydrologic data of test basin, topography inquiry and survey was conducted, and sub-basins data, such as areas of test basin and impervious layer, were arranged. On the basis of that result, a drainage pattern was drawn up, and for the collection of hydrological data such as the rainfall data and the water-level data-EMS, installed at Dong-eui Univ. in 1998, and AWS-DEU, installed at the point of the end discharge an opening of test area, are in operation, and the measurable velocity data was collected and classified at the point of the end outflow an opening. Through those process, an discharge was calculated at the point of an outflow situation. The discharge was compared and analyzed in total runoff, peak discharge, and travel time using by RRL method and ILLUDAS model in The first (2000) and in total runoff, peak discharge, and by RRL method, ILLUDAS model and SWMM model in The Second (2002). By analyzing those process, this study can be used as basic data for the phase of the runoff variation caused by change of test basin, in the future.
Comparison of Optimization Methods for Leak Detection Analysis in Pipe Network
Park, Pung-Il ; Hong, Sung-Hun ; Park, Nam-Sik ; Chun, Si-Young ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 529~536
Transient pressure waves may traverse water supply pipelines at high speed. The behaviour of these waves are altered by properties of the pipelines, for example, leaks, minor loss factors, friction factors, etc. While in propagation, transient pressure waves collect a substantial amount of information about the pipe network. The leakage condition of the system is also included. By analysing the behaviour of such transient, information concerning the pipeline could be extracted from the wave. Leak detection in water distribution systems can be accomplished by solving an inverse problem using measurements of pressure and then minimization of the difference between measured and calculated heads produces a solution for the objective. The optimization problem requires significant amount of computation. Thus efficient and effective optimization scheme is essential. In this research the genetic algorithm and the shuffled complex evolution method are compared. The primary findings of this research is that the performance of the SCE method is better than of the GA method in both efficiency and accuracy.
Extracting Appropriate Grid Size Using Geometrical Topographic Index
Han, Kun-Yeun ; Lee, Chang-Hee ; Lee, Jae-Young ; Lee, Soo-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 537~543
To derive an appropriate grid size for rainfall-runoff modeling, lumped model, semi-distributed model, and distributed model can be used. In this paper, TOPMODEL is used because its application has been proved. It is examined the effect of DEM grid size on simulated hydrological response, so the appropriate grid size is suggested. Runoff hydrographs are derived for different DEM grid sizes under different rainfall and initial base flow conditions by using topographic index. Normalized peak discharges versus grid size are compared for different initial base flows and rainfall intensities. In the usage of NGIS data, the problem related with extracting appropriate grid size was systematically shown through this hydrologic modeling study. It is also applicable for the practical usage in this field.
Roughness Characteristics and Velocity Profile in Vegetated and Nonvegetated Channels
Song, Jai-Woo ; Park, Sung-Sik ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 545~552
The purpose of this study is to investigate the roughness characteristics and the velocity profile in vegetated and non-veg-elated channels through hydraulic model experiments, and to find a relationship between the velocity profile and the roughness height. The velocity is logarithmically distributed from the channel bottom to 0.8 of flow depth(h) in the non-vegetated channel and from the upper part of vegetation to 0.8 of flow depth(
) over the vegetation deflected by the flow in vegetated channel. The elevation(
) corresponding to zero velocity is calculated by using measured velocity profiles. In a non-vegetated channel,
is 0.18 of mean diameter(d) of crushed rock over the channel bottom and in a vegetated channel,
is 0.40 of mean height(
) of deflected vegetation. The roughness height is calculated by using velocity profiles in a vegetated channel and it is shown that the flow resistance tends to increase with the density of vegetation. The velocity profiles measured in a vegetated channel is a relatively good agreement with those predicted from formulae proposed by Kouwen et al.(1969), Haber(1982) and El-Hakim et al.(1992).
Parameter Optimization of TANK Model using Geographic Data
Kim, Chul ; Kim, Souk-Gyu ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 553~560
Parameter optimization method of TANK model was developed using the basin geographic data only. Six sub-basins were selected to develop the method and, geographic data were constructed to each sub-basins using GIS. Topography, soil type, landuse, geology were used and 16 geographical characteristics were derived. The model parameters were optimized using the Powell method, GA method, SCE-UA method at 6 watersheds. The error of parameters is smallest one, and a multiple linear regression model was applied to the relationship between the model parameters and the 16 basin characteristics. The parameters were optimized using the developed equations, and model application using the parameters worked successfully at all basins, suggesting that the parameters of the TANK model could be evaluated using the results of this research.
Internal Generation of Waves in Fully Elliptic Modified Mild-Slope Equation using Source Function
Cho, Yong-Jun ; Cho, Eun-Kyung ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 561~566
Improved method for generating waves in elliptic modified mild-slope equation (MMSE) is described. After recasting MMSE into the form of a pair of hyperbolic first order equations, we solved this system with added mass in continuity equation using Green functions, the solution of which reveals the relationship between the source amplitude and surface wave characteristics. We test the model for generation of desired incident waves in an annular entrance channel. We also compare model results with available experiment data.
Application of Bootstrap Confidence Limit Estimation Methodology of Hydrologic Time Series
Kwon, Hyun-Han ; Moon, Young-Il ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 567~576
We supplemented shortcomings of the gaussian point estimation theory that is a representative method among the methods of confidence limit estimation. We applied the bootstrap confidence limit estimating technique that can use many in time series data to daily reservoir water level which is hydrologic time series and examine suitability and applicability. As results of estimation of confidence limit for 90% confidence level, bootstrap method shows the consistent confidence bands that include most of time series except only 3 time series in the flood period. In non-flood period, water level time series displayed same results and considers by method that can supplement shortcoming of problem etc. of symmetry that appear in confidence limit which use the point estimation method.
Active Dispersion-Correction Scheme of 2-D finite Differenece Model for the Simulation of Tsunami Propagation
Yoon, Sung-Bum ; Lim, Chae-Ho ; Lee, Jong-In ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 577~583
A new two-dimensional finite difference scheme using linear shallow-water wave equation on uniform grids is developed to simulate the propagation of distant tsunamis over slowly varying topography with accurate physical dispersion effects as given by Boussinesq equations. The new scheme uses the dispersion-correction terms to compensate the difference between the numerical dispersion caused by numerical model based on shallow-water wave equation and the physical one given by Boussinesq equations. The numerical model developed in this study is tested to the cases of two-dimensional propagation of an initial Gaussian hump over a constant water depth, and the results are compared with analytical solutions. The present model is shown to be considerably accurate.
Internal Generation of Waves for Time-Dependent Wave Transformation Equations - The Line Source Method and the Source Function Method -
Kim, Gun-Woo ; Lee, Chang-Hoon ; Suh, Kyung-Duck ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 585~594
This paper investigates the inter-relation of two types of internal generation technique of waves, i.e., the line source method and the source function method. The source functions, which are distributed uniformly over a source band of one grid, are derived for the Boussinesq equations and the time-dependent extended mild-slope equations. Both wave heights and phases are accurately reproduced by the one-grid source function for all the wave equations considered. The energy velocity approach used in the line source method is verified analytically by applying the fractional step splitting method to the time-dependent wave equations including the source term.
Forecasting the Water Quality of Youngsan River by Combined of GA and Fuzzy System
Park, Sung-Chun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 595~602
The bloom of population and the rapid industrialization since industrial revolution began resulted in increasing water demand. Otherwise, wastewater of industrial manufactures and sewage of municipal sources not only deplete the quality of water resources through increasing polluted matters but also cause eutrophication phenomenon in rivers. These led to that water bodies run out of their self-purification ability and the ecosystem is being destroyed day by day. For this reason, management of water resources quality is focused on how to prevent the contamination from water resources effectively and economically. There are two metrologies of water quality modeling applying to water quality management: White-Box model and the Black-Box model. In this study, we developed a model for predicting the concentration of DO, BOD, T-N and T-P by using a Genetic algorithm and Fuzzy system.
Black Shale as an Effective Sorbent for Removal of Organic Contaminants and Heavy Metals
Min, Jee-Eun ; Park, Jae-Woo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 6B, 2004, Pages 603~608
Black shale was examined to remove an organic pollutant and hexavalent chromium in batch experiments. Black shale containing high organic carbon content by 5.2 % shows good sorption capacity compared to hexadecyltrimethylammoniubromide (HDTMA)-organoclay in trichloroethylene (TCE) sorption test. Sorption of TCE was effective in neutral and acidic solution due to solvency of TCE. As black shale does not have toxic effect to soil microorganism, it can be used as a natural geosorbent or effective reactive barrier as well as bentonite. As for the removal of hexavalent chromium, the removal rate was higher in acidic soil pH. Humic acid can enhance the sorption of organic pollutant and heavy metal in groundwater.