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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 17, Issue 3_6 - Nov 1997
Volume 17, Issue 2_6 - Nov 1997
Volume 17, Issue 1_6 - Nov 1997
Volume 17, Issue 3_5 - Sep 1997
Volume 17, Issue 2_5 - Sep 1997
Volume 17, Issue 1_5 - Sep 1997
Volume 17, Issue 3_4 - Jul 1997
Volume 17, Issue 2_4 - Jul 1997
Volume 17, Issue 1_4 - Jul 1997
Volume 17, Issue 3_3 - May 1997
Volume 17, Issue 2_3 - May 1997
Volume 17, Issue 1_3 - May 1997
Volume 17, Issue 3_2 - Mar 1997
Volume 17, Issue 2_2 - Mar 1997
Volume 17, Issue 1_2 - Mar 1997
Volume 17, Issue 3_1 - Jan 1997
Volume 17, Issue 2_1 - Jan 1997
Volume 17, Issue 1_1 - Jan 1997
Selecting the target year
An Application of HEC-1 to a Large Watershed
Kim, Joong-Hoon ; Jun, Hwan-Don ; Yoon, Yong-Nam ; Lee, Jae-Soo ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 1~1
The objective of this study is to examine the applicability of HEC-1. a flood-runoff simulation model. to simulate a large watershed. To examine the applicability of HEC-1 to a large watershed, the data which were observed in the Han river basin in the 1984 and 1990 flood events are collected first. then the basin runoff characteristic parameters for HEC-1 are calibrated. Using the basin runoff parameters. a flood runoff hydrograph is calculated by HEC-1 to be compared with the observed hydrograph at the Indogyo station. The comparison shows that the simulated hydrograph is agreed well with the observed hydrograph and it confirms that HEC-1 can be successfully applied to a large watershed simulation. Finally, 100 and 200-year frequency flood hydrographs are estimated using the calibrated runoff parameters.
A Quantitative Analysis of the Inflow to Deeply Located Tunnel
Heo, Jun-Seok ; Chung, Il-Moon ; Heo, Jun-Haeng ; Cho, Won-Cheol ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 13~13
Underground tunnel, which was constructed under sea or river, has a pressure from the constant water depth of sea or river. So the confined groundwater is flowed into the tunnel. This inflow may cause many problems during tunnel construction period and after construction. In this study, two dimensional seepage analysis was executed by finite element method to compute the inflow rate to the tunnel. The flow pattern and total head distribution depend on permeability and thickness of porous media, water depth of upper part. heterogeneity of media. and inclination of bottom stratum. The results according to several flow and geological conditions show that these factors affect the variation of inflow rates.
Accuracies of Numerical Models for Density-dependent Groundwater Flow and Transoprt
Park, Nam-Sik ; Yi, Yong-Kon ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 23~23
We have examined accuracies of SUTRA (Voss and Souza, 1987) and DSTRAM (Huyakorn and Panday, 1991) developed for simulating density-dependent ground water flow and solute transport. Where density variation is small. such as the case of sea water intrusion (roughly 2.5% heavier than freshwater). accurate numerical solutions can be obtained by using sufficiently small elements. However, in practice, it may not be possible to use such small elements due to overwhelming computational requirements. Therefore, even for small density-variation problems development of more robust numerical techniques appears necessary. For simulating brine, which is heavier than sea water, intrusion problems, enhancements of accuracies of numerical solutions were not significant as element sizes were reduced. Therefore. limitations of the tested numerical models were revealed.
Analysis of Runoff Process Using Storage-Effective Drainage Model in River Basin
Cho, Hyeon-Kyeong ; Lee, Soon-Tak ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 35~35
This study aims at the analysis of the rainfall-runoff process by applying SED (Storage- Effective Drainage) model in river basin. In the anlaysis. runoffs simulated by the model is compared with the observed values in Museung gauging stations of Wi stream. representative experimental basin of International Hydrological Program (IHP) in Nakdong river. For the estimation of parameters of the proposed rainfall-runoff model. Fletcher-Powell method is selected and used in estimating parameters of Green-Ampt equation (SM,
) and initial storage (
) which are parameters of SED model. And as a consequence of calibration. it was obtained for the most suitable parameters to satisfy the proposed objective function. As the result of analysis of rainfall-runoff process using SED model. it showed that this model was effective in the simulation of runoff using rainfall.
An Experimental Study on Local Scour According to Pier Size and Attack Angle
Ahn, Sang-Jin ; Kim, Ung-Yong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 45~45
In this paper, the local scour depth according to bridge piers of attack angle and pier sizes for semi-circular pier shapes was studied by laboratory flume experiments. The effects of scour depth according to another pier size and attack angle in the same opening ratio also discussed. The experiments operated that increased to slope and flow depths in terms of attack angle. The flume slope was carried that increased with 0.01%, 0.03%, 0.05%, 0.1%, 0.2%, and 0.4%. And the angle of attack were operated with
. To investigate the effects of opening ratio and attack angle. the experiments were also performed same projected pier widths to varied for angle of three size pier for
on pier size orders. The results of the experiments show that the maximum scour depth increased not only increasing flume slope and Froude number with same attack angle, but also increasing attack angle with same flume slope. The comparison shows that relative difference exist between another pier size and that obivously reveal larger scour depth at skewed flow direction than parrallel flow direction.
Numerical Simulation of River Bed Changes near the Jamsil Submerged Weir (I) - Parameter Estimation and Verification -
Lee, Kil-Seong ; Lee, Nam-Joo ; Oh, Seong-Taek ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 55~55
To select a numerical model for river bed changes to be applied. we have analyzed characteristics of the existing models. Among the models. we select the OSU model. a 2-dimensional unsteady sediment transport model that can simulate both the sediment transport and the flushing phenomena and reflect characteristics of a channel and a reservoir. The OSU model is a semi-coupled finite difference model that can be applied to a river. a reservoir. or a lake and can simulate the transport of fine sand, silt. and clay. The parameters of the flow submodel are estimated by calibrating with the measured velocity. The parameters of the sediment submodel are estimated and verified with measured bed level changes using three prediction ratios.
Numerical Simulation of River Bed Changes near the Jamsil Submerged Weir (II) - Model Application and Gate Operation -
Lee, Kil-Seong ; Lee, Nam-Joo ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 67~67
MOSU (Modified OSU) model. a horizontally two-dimensional sediment transport model, is applied to simulate the bed level changes of the upstream of the Jamsil submerged weir. We obtained the travel time needed to pass through the movable weirs from the simulation results of unsteady flow. To find a tendency of bed level changes by the gate operations. unsteady simulations are performed for both a virtual sand bed and a virtual silt bed. respectively. For the investigation of flushing effects on the present bed state. possible future bed changes are predicted with 1993 bed conditions. Gate operations for flushing are divided into two steps. resuspension and transport operations.
A Study on the Wave-induced Current Pattern and Variations of the Estuary Morphology of a Large River
Park, Sang-Kil ; Choi, Byoung-Seub ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 77~77
For the study of the wave-induced current pattern and variations of the Estuary morphology of the Large River, the numerical model of wave-induced current model was applied to the estuary and analyzed the bottom surveying data. In the normal stage of Nakdong estuary, the wave-induced currents maintain a superior position to the barrage discharges. The areas of large waves computed are found to match with the areas of erosion, and the areas of small waves computed with the areas of deposion. It is also found that the sedimentation pattern of the Nakdong estuary bottom progresses to the Eulsukdo side because of the incoming waves along the center of the channel.
Sea Water Intrusion Interface in the Coastal Area Using Finite Element Method
Ahn, Tae-Bong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 89~89
A salt water intrusion in the coastal area is solved using finite element method. The transition zone between fresh water and salt water is ignored due to relative small thickness of 1-2 m. The sodium chloride affects on the hydraulic conductivity of soils such as soil-bentonite mixtures which are often used for hydraulic barriers. The salt water intrusion interface considering hydraulic conductivity changes in the salt water contaminated zone are found by residual flow procedure (RFP) for the simulated model.
Aerobic Degradation of 2,4,6-Trinitrotoluene with Microorganisms Isolated from Munitions Waste Contaminated Soils: The Effects of Environmental Conditions on TNT Biotransformation
Bae, Bum-Han ; Choung, Youn-Kyoo ; Ko, Kwang-Baik ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 2_1, 1997, Pages 99~99
The effects of culture conditions on the transformation of 2,4,6-Trinitrotoluene (TNT) under aerobic conditions were studied in batch reactors with two strains of TNT transforming bacteria isolated from munitions waste contaminated soils. These two species were tentatively identified as Alcaligenes sp. and Enterobacter sp., respectively, by the GC analysis of whole-cell fatty acids. Experiments were performed with two pure cultures in a batch reactor under various culture conditions including pH, the types of nitrogen source, and the amount of carbon source (glucose). The rate of TNT biotransformation was stimulated by increasing glucose concentration, with Enterobacter sp., however, nitrate inhibited biotransformation of TNT. In addition, various reduction products of TNT accumulated in the Enterobacter sp. inoculated reactor. In Alcaligenes sp. inoculated reactor. 4-hydroxyamino-2.6-dinitrotoluene (4OH) was the main intermediate. Decrease in culture pH from 7.0 to 6.0 in the Alcaligenes sp. reacor resulted in accmulation of 4OH in the culture medium and. in the same time, reduced the formation of azoxy compounds. The decrease in TNT concentration remained the same regardless of the types of nitrogen source in Alcaligenes sp. reactors. In the Enterobacter sp. inoculated reactor without any supplemental nitrogen source, nitrite and nitrate accumulated in the culture medium, which suggests the removal of nitro group from the benzene ring of TNT.