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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 26, Issue 6D - Nov 2006
Volume 26, Issue 6C - Nov 2006
Volume 26, Issue 6B - Nov 2006
Volume 26, Issue 6A - Nov 2006
Volume 26, Issue 5D - Sep 2006
Volume 26, Issue 5C - Sep 2006
Volume 26, Issue 5B - Sep 2006
Volume 26, Issue 5A - Sep 2006
Volume 26, Issue 4D - Jul 2006
Volume 26, Issue 4C - Jul 2006
Volume 26, Issue 4B - Jul 2006
Volume 26, Issue 4A - Jul 2006
Volume 26, Issue 3D - May 2006
Volume 26, Issue 3C - May 2006
Volume 26, Issue 3B - May 2006
Volume 26, Issue 3A - May 2006
Volume 26, Issue 2D - Mar 2006
Volume 26, Issue 2C - Mar 2006
Volume 26, Issue 2B - Mar 2006
Volume 26, Issue 2A - Mar 2006
Volume 26, Issue 1D - Jan 2006
Volume 26, Issue 1C - Jan 2006
Volume 26, Issue 1B - Jan 2006
Volume 26, Issue 1A - Jan 2006
Selecting the target year
A Study of the Forecasting of Hydrologic Time Series Using Singular Spectrum Analysis
Kwon, Hyun-Han ; Moon, Young-Il ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 131~137
We have investigated the properties of the Singular Spectrum Analysis (SSA) coupled with the Linear Recurrent Formula which made it possible to complement the parametric time series model. The SSA has been applied to extract the underlying properties of the principal component of hydrologic time series, which can often be identified as trends, seasonalities and other oscillatory series, or noise components. Generally, the prediction by the SSA method can be applied to hydrologic time series governed (may be approximately) by the linear recurrent formulae. This study has examined the forecasting ability of the SSA-LRF model. These methods were applied to monthly discharge and water surface level data. These models indicated that two of the time series have good abilities of forecasting, particularly showing promising results during the period of one year. Thus, the method presented in this study suggests a competitive methodology for the forecast of hydrologic time series.
Analysis of Generating Mechanism of Secondary Flows in Turbulent Open-Channel Flows using DNS Data
Joung, Younghoon ; Choi, Sung-Uk ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 139~144
Using DNS data for turbulent flows in an open-channel with sidewalls, the mechanisms by which secondary flows are generated and by which Reynolds shear stresses are created, are demonstrated. Near the sidewall, secondary flows invading towards the sidewall are observed in the regions of both lower and upper corners, while secondary flows ejecting from the sidewall towards the center of the channel are created elsewhere. The distributions of Reynolds shear stresses near the sidewall are analyzed, connecting their productions with coherent structures. A quadrant analysis shows that sweeps are dominant in two corner regions where secondary flows invading towards the sidewall are generated, but that ejections are dominant in the region where secondary flows ejecting towards the center of the channel are created. Also, conditional quadrant analyses reveal that the productions of Reynolds shear stresses and the patterns of secondary flows are determined by the directional tendencies of coherent structures.
Development of Flood Runoff Forecasting System by using Artificial Neural Networks - Development & Application of GUI_FFS -
Park, Sung-Chun ; Oh, Chang-Ryol ; Kim, Dong-Ryeol ; Jin, Young-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 145~152
In the present study, a nonlinear model of rainfall-runoff process using Artficial Neural networks(ANNs) which have no consideration on the physical parameter for the basin was developed at Naju station which is the main stream of Yeongsan-river, and Sunam station which is the main stream of Hwangryong-river. The result from the model of ANN_NJ_9 at the Naju station revealed the best result of the rainfall-runoff process, while the model of ANN_SA_9 for the Sunam station. Also, GUI_FFS developed in the research showed the
of more than 0.98 between the observed and predicted values using the rainfall and runoff in the respective stations. Therefore, the GUI_FFS might be expected that it can play a role for the high reliability to operate and manage the water resources and the design of river plan more efficiently in the future.
Estimation of Instream Flow for Fish Habitat using Instream Flow Incremental Methodology(IFIM) for Major Tributaries in Han River Basin
Lee, Joo Heon ; Jeong, Sang Man ; Lee, Myung Ho ; Lee, Yong Su ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 153~160
To recommend ecological flow for major tributaries in Han River basin, the Instream Flow Incremental Methodology (IFIM) have been applied. In particular physical habitat simulation using PHABSIM have been selected for microhabitat variables and QUAL2E model have been used to implement macrohabitat simulation. Habitat Suitability Criteria (HSC) for different life stages in accordance with different hydraulic variables (depth and velocity) have been presented by the field surveying data. We review IFIM procedures and discuss limitations of habitat simulation with specific reference to Han River basin. The results of this research can be used as reference flow for estimation of instream flow in Han River.
Two-dimensional Tracer Tests in Natural Rivers Using Radioisotope
Seo, Il Won ; Baek, Kyong Oh ; Jeon, Tae Myong ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 161~170
A tracer test technique using a radioisotope was proposed to investigate pollutant mixing characteristics in rivers. The main advantages of radioisotope as a tracer in field tests are that it can be detected easily, and that its detection range is quite large. Also, using the radioisotope, the amount sorbed by the bed material and the biota may be a minimum. Field tracer tests were conducted at seven different sites in natural rivers with various meandering pattern. Based on the acquired data, the behavior of the tracer cloud in the intermediate-field was examined two-dimensionally, and dispersion coefficients were calculated using several evaluation methods. Results revealed that the tracer cloud was transported skewed to the outer bank and dispersion coefficients in bends were larger than those in straight reaches.
Development of 2-D Advection-Dispersion Model with Dispersion Tensor Considering Velocity Field
Seo, Il Won ; Lee, Myung Eun ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 171~178
The finite element model based on the 2-D advection-dispersion equation incorporating the dispersion tensor that is calculated using velocity field data was developed in order to analyze more accurately 2-D mixing of pollutants for meandering streams. The proposed model was tested using the straight channel that inclined at 45o in the Cartesian coordinate system. The simulation results showed that dispersion tensor model using velocity field data gives an accurate solution. The suitability of the proposed model in analyzing actual pollutant mixing in meandering channels was demonstrated by comparing the simulation results with experimental data obtained from the tracer tests in the laboratory flume. Comparison results showed that the proposed model with dispersion tensor can represents more accurately the mixing phenomena of the pollutants in the meandering channels in which the direction of the primary flow is varying periodically along the channel.
An Experimental Study for Clogging Factors Estimation of Grate Inlets in Urban Area
Kim, Jung Soo ; Kwon, In Sup ; Yoon, Sei Eui ; Lee, Jong Tae ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 179~186
Effective interception area of street grate inlets was decreased by clogging with trash, debris, and sand. It also decreased the interception capability of grate inlets and increased the inundation area in street. Therefore, it is necessary to analyze the clogging characteristics and interception capability change by clogging for appropriate design and management of grate inlets. Hydraulic experimental apparatus which can be changed the gutter transverse slopes, longitudinal slopes of street and clogging condition of grate inlet (
) was installed for this study. 81 total experiments were conducted with 8 different clogging condition. The interception capacities of grate inlets clogged curb direction are smaller than those of clogged flow direction. As the longitudinal slopes of street increase, the interception capacity of grate inlet decreases due to splash-over phenomena. This is also observed at grate inlets which has no clogging condition. In general, 50% of clogging factor was selected in design of grate inlet in foreign country. The clogging factor for same clogging condition are suggested 0.25~0.65 in domestic urban area.
Bridge Scour Prioritization and Management System (I) - System Development -
Kwak, Kiseok ; Park, Jae Hyun ; Chung, Moon Kyung ; Woo, Hyo Seop ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 187~195
A bridge scour management system is developed to evaluate the vulnerability of bridge piers to scour and to help establish effective disaster measures, taking into account the locality and scour characteristics in Korea. This system is programmed using the techniques of the geographical information system(GIS) for the storage, retrieval, and display of information regarding to bridge scour. The system functions are basically divided into two parts; prioritization and maintenance. Bridges are initially screened and prioritized for bridge scour inspection and evaluation using the basic information which is obtained from the office review. The bridge scour evaluation including site investigation is performed and the vulnerability of bridge piers is categorized into six groups taking into account the local scour depth, foundation bearing capacity, foundation type, foundation depth, and present scour condition. The system tabulates and plots all the data and the results.
Bridge Scour Prioritization and Management System (II) - System Verification -
Kwak, Kiseok ; Park, Jae Hyun ; Yoon, Hyun Suk ; Woo, Hyo Seop ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 197~208
Case studies for real bridge sites are performed to verify the applicability of the Bridge Scour Management System in the field. The case studies for 20 bridges in Gangneung District of National Road Management consist of site investigations including the boring tests, bridge scour analyses for the design floods, bearing capacity evaluation of the bridge foundation before and after scour, and comprehensive evaluation of the bridge scour maintenance. The bridge scour management system is verified as an useful tool which can evaluate bridge scour vulnerability quantitatively, and is also proposed as a reasonable system which can help establish effective measures and secure the safety of bridges during floods.
Numerical Experiments of Bar Migration in Meandering Channels
Jang, Chang-Lae ; Jung, Kwansue ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 209~216
This study is to analyse the characteristics of bar migration, which is important roles to bank erosion and meandering development, for the meandering channels with erodible bed by using a 2-D numerical model in the generalized coordinate systems. The results of the numerical experiments showed that the features of bar migration were affected by the meandering wavelength to the width ratio, and had a relatively good agreement with the criterion for bar migration through a bend suggested by Kinoshita and Miwa (1974). The bar migrated with speed in the channel with long wavelength and broad width, and the criterion for bar migration was increased. The bar celerity was decreased abruptly near the criterion.
Benefit Cost Analysis on Mitigation of Environmental Impacts Using Contingent Valuation Method : The Kwangyang Habor Case
Kang, Hee Yong ; Jung, Seung Jin ; Kim, Kyu Han ; Pyun, Chong Kun ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 217~223
This study is to investigate the effect of environmental mitigation in relation to the construction of quay structures for containers and to estimate economic values of environment-friendly structures using CVM. The result shows that the B/C ratio of environment-friendly quay structures designed to mitigate environmental impact is 4. That is, environmental improvement work proves to generate environmental benefit over 4 times as much as the construction cost. Considering the results of the study, environmental improvement work is of great benefit to citizens, and CVM is expected to become an efficient method to measure a proper size for a large construction project as well as to forge public consensus.
Estimation of Pollutant EMCs and Loadings in Highway Runoff
Kim, Lee-Hyung ; Ko, Seok-Oh ; Lee, Byung-Sik ; Kim, Sunggil ;
Journal of The Korean Society of Civil Engineers, volume 26, issue 2B, 2006, Pages 225~231
The nonpoint source control is based on TPLMS (Total Pollution Load Management System) program. Recently, the Ministry of Environment in Korea has programed TPLMS for 4 major large rivers to improve the water quality in rivers by controling the total pollutant loadings from the watershed area. Usually the urbanization is the main pollutant sources, particularly for nonpoint pollutants, because of high imperviousness and high pollutant mass emissions. The stormwater runoff from urban areas is containing various pollutants such as sediments, metals and toxic chemicals due to human and vehicle activities. Of the various landuses, the highways are highly polluted landuses because of high pollutant accumulation rate by vehicle activities during dry periods. Therefore, this research is achieved to provide pollutant EMCs (Event Mean Concentrations) and mass loadings washed-off from highways during rainfall periods. Five monitoring locations were equipped with an automatic rainfall gage and an flow meter. The results show that the EMC ranges for 95% confidence intervals in highway land use are 45.52-125.76 mg/L for TSS, 52.04-95.48 mg/L for COD, 1.77-4.48 mg/L for TN, 0.29-0.54 mg/L for TP. The ranges of washed- off mass loading are
for TSS and