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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 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
Selecting the target year
A Two-dimensional Sediment Transport Model by the Coordinate Transformation(I) - Model Development -
Lee, Nam-Joo ; Lee, Kil-Seong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 407~407
Development of a sediment transport model that is applicable to the prediction of the bed level change in rivers, reservoirs, estuaries, and coastal regions becomes an important problem in the safety of the hydraulic structures and in the water qualify management. Depth-averaged two-dimensional continuity and momentum equations from the three-dimensional Reynolds equations are used. Depth-averaged two-dimensional advection-diffusion equation from the three-dimensional one is used A depth-averaged
turbulence model is added to increase reliability of the eddy viscosity. A flow model, a transport model, a bed change model, a turbulence model, and sediment transport formulas for cohesive and noncohesive sediments are to yield a sediment transport model in the Cartesian coordinate system. To treat irregular boundary, the model uses the orthogonal curvilinear coordinate system. Numerical grids are generated by means of the Poisson equations. This model is a coordinate-transformed sediment transport model that is applicable to cohesive and noncohesive sediments in an unsteady horizontally two-dimensional flow.
A Two-dimensional Sediment Transport Model by the Coordinate Transformation(II) - Model Application -
Lee, Nam-Joo ; Lee, Kil-Seong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 423~423
A coordinate-transformed sediment transport model that is applicable to cohesive and noncohesive sediments in an unsteady horizontally two-dimensional flow is applied to the upstream of the Jamsil submerged weir to verify the model's accuracy. The
finite difference grids are used and computational time steps are selected within the range specified by the stability condition. The simulation cases are created to be considered with the gate operations of the Jamsil submerged weir Flow characteristics are analyzed and durations of gate operating are obtained from the simulation results of steady and unsteady flows. A sensitivity analysis is performed to understand changes of the model results due to changes of the parameters and sediment mass conservation of the model is checked. Unsteady flows are used for the simulations for sediment transport . To find characteristics of bed level changes of each sediment class, unsteady simulations are performed for both a fictitious sand bed and a fictitious silt bed, respectively. To find bed level changes due to the gate operations predictions are made for the real bed. Simulation results of the model largely agree with the laboratory and field data, Therefore, the model can be used to analyze and predict the mid-scale local sediment transport phenomena.
Modeling Urban Runoff and Non-Point Source Pollutant Discharges Based on Neural Networks
Shin, Hyun-Suk ; Choi, Si-Jung ; Kim, Joong-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 437~437
In this study. the neural network(NN) models to predict the urban runoff and qualify discharge are developed and applied to check its applicability to a small urban basin. In addition, the applicability of NN model is compared to those of EPA SWMM (Storm Water Management Model) which is a well-known simulation model of runoff and non-point source (NPS) pollutant discharges in urban basins. The models are applied to Yongdoo basin in Dongdaemoon-gu, Seoul, which is one of typical small urban basins containing the actual data of four rainfall-runoff data and a NPS (SS and BOD loads) data set. Several criteria to estimate the prediction error are utililized in the comparison. As a result, it is found that both models well simulate the runoff quantity and qualify from the urban watershed. It can be concluded, however, that the NN model developed in this study is as good as SWMM, if not better, in the prediction modeling of flow and NPS runoff.
An Analysis on the Variation of Long-term Runoff Characteristics of Basin before and after Dam Construction - I. Estimation of NWS-PC Model Parameters using GIS
Yoon, Yong-Nam ; Yoo, Chul-Sang ; Ahn, Jae-Hyun ; Yang, In-Tae ; Koh, Deuk-Koo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 449~449
This study is to see how effectively the NWS-PC model Parameters can be estimated using GIS. Basic informations such as DEM(Digital Elevation Model), digital soil map, land use information from satellite image are provided and analyzed for estimating the sub-basin characteristics in GIS. These characteristics are used to estimate the model Parameters for each sub-basin. The model parameters estimated based on Amstrong(1978) are given as a possible range, which will be fixed through the calibration procedure. In this study, we used the 1974 data for calibration and the 1979 event for verification. From the calibration procedure, we could find that the Parameters related with infiltration and storage of water tend to have the minimum value of the range and that the parameters related with exfiltration of water tend to have the maximum value of the range. This result seem to reflect the hydrologic characteristics of Keum-river basin, which could be used to fix the model parameter without difficult calibration procedure. The simulation results show that the relative error of calculated discharge to observed discharge to be within approximately 10%. Therefore, the model with the parameters calibrated was considered to be adaptable for long-term runoff analysis for Keum-river basin.
An Analysis on the Variation of Long-Term Runoff Characteristics of Basin before and after Dam Construction II. An Analysis on the Variation of Long-Term Runoff Characteristics of Basin Using Model Parameters Estimation
Yoon, Yong-Nam ; Kang, Byeong-Seok ; Kim, Ung-Tae ; Kim, Jae-Hyung ; Ko, Ick-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 461~461
The purpose of the present study was to evaluate the changes of long-term runoff characteristics of a large river basin due to construction of a large multipurpose dam using NWS-PC Model, which was simulated with rainfall data, evapotranspiration data and phisiographic data. The phisiographic Parameters of the model are obtained from the established GIS data base and some parameters to account for the changes of natural environment are quantified from remote sensing film taken before and after reservoir construction. Rain and observed runoff data of the year, 1974, were used to calibrate the model. After having calibrated the model by trial and error method, runoff characteristics of 9 years before and after dam construction were simulated, From the simulation results, the relative error of calculated discharge to observed discharge was found to be within approximately 10%. Therefore, the model was considered to be adaptable for the present study, and the changes in long-term runoff characteristics were evaluated based on the runoff computations. In conclusion, it was found that runoff ratio of watershed upstream of the reservoir is slightly increasing due to the changes of natural environment, and the flood peak flows are attenuated due to storage effect of the reservoir, wheres, low flows are, on the average, increased due to regulated outflow releases from the reservoir.
A Comparative Study on the Operation Efficiency of the Continuous and Intermittently Aerated Fluidized Bed (I) - Effect of Temperature and pH -
Lee, Jeoung-Su ; Kim, Tae-Geun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 469~469
Fluidized bed reactors of intermittent aeration type and continuous aeration type are considered to bring remarkable change in species composision of microorganisms , due to difference between their operating systems. However. this study aims to raise field realization of fluidized bed reactors, through a comparative study of the characteristics of fluidized bed reactors of intermittent aeration type and continuous aeration type, according to changes of temperature and pH, around treatment rate timewise changes of treatment, changes of activation according to temperature and pH, change of the concentration of microorganisms, ect.
Study on Aerobic Degradation Mechanisms of a Nitroaromatic Compound, p-nitrophenol (PNP), by a Microorganism Isolated from a Paddy Soil.
Choung, Youn-Kyoo ; Bae, Bum-Han ; Yeom, Ok-Ran ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 481~481
A study was conducted on the degradation mechanism of a resistant nitroaromatic compound, p-nitrophenol(PNP) which is a major degradation product of many organophosphorous pesticides by soil microorganisms. Experiments were performed to measure degradation rates of PNP in batch reactors containing 100mL liquid medium, PNP (50mg/L), and three paddy and three field soils, respectively. Results showed that degradation of PNP occurred in all reactors after 12-24 hours of lag periods. The estimated first order reaction rate for the field and paddy soils ranged from 0.11-0.28(1/h), respectively A gram-negative, rod-shaped PNP-degrading microorganism was isolated from a paddy soil. A characterization study in a batch reactor under aerobic condition showed the accumulation of nitrite in the culture medium and the growth of the isolate with the decrease of PNP. In addition, the isolated microorganism was able to use salicylic acid as the sole carbon and energy source. Therefore, PNP is thought to be degraded by dioxygenase enzymes mediated denitration reaction.
Monitoring of Coagulation Process by Automatic Pilot Filter
Han, Moo-Young ; Kang, Chang-Ho ; Kim, Young-Jin ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 491~491
The optimum control of WTP is vital for the economic and steady operation of WTP The automatic pilot filter is an on-line instrument which can be used to monitor the coagulation process continuously. The purposes of this study are to verify the effectiveness of pilot filter at a real WTP and to find the operational characteristics of pilot filter system. Through 7 months of study at the WTP, pilot filter did not experience any significant problem and proved that it can detect any small changes affecting the coagulation process. The effluent of pilot filter was very sensitive to the change of raw water pH. It can predict the change of sedimentation basin effluent due to the plant recycle flow. It can also detect the temporary breakdown of a chemical injection system and finally it can be used to evaluate the flash mixer pilot study to find the optimum configuration and optimum operational parameters. Automatic pilot filter system is proved to predict the coagulation process more effectively than any other on-line monitoring method currently used in Korea and can be recommended to use at water treatment plants.
Modeling Study on the Electrokinetic Extraction of Contaminants from Soils
Kim, Geon-Ha ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 503~503
As an in situ soil remediation method, the electrokinetic technology receives much attention for its applicability to fine-grained soils. Even though electrokinetics has been proven to be feasible in bench-scale experimental studies, there is still a lack of thorough understanding of its cleanup mechanisms. This paper is a discussion on the derivation of theoretical models for electrokinetic phenomena, numerical formulation of theoretical model and model validation. Coupled flow theory was applied to derive governing equations in this research. Soil-contaminant, contaminant-contaminant interactions are modeled as well . Developed models are implemented into computer using finite element method Developed models are validated with one-dimensional experimental data from the literature. The developed model provides an effective tool to better understand the electrokinetic extraction processes and to optimize operation parameters.
Flocculation Basin Performance Evaluation and Upgrading Method in WTP
Han, Moo-Young ; Kim, Young-Jin ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 511~511
The flocculation process in conventional WTP is a process in which the water mixed with coagulant is gently mixed to form settleable floc. The purpose of this study is to find a method of calculating flocculation efficiency from the hydraulic and chemical characteristic, and to propose the improvement strategy of flocculation basin and guideline of new design method of flocculation basin. Hydraulic tracer test is performed in the laboratory and chemical test is performed at the WTP with 20: 1 scale pilot plant. The flow efficiency of 3-types baffle wall is evaluated with 'Index' and 'Rebhun & Argaman' method in the laboratory The effect of arrival time from the flash-mixing basin to inlet of flocculation basin is evaluated through Zeta potential measurement. The flocculation efficiency of the 3-types baffle wall is also evaluated with chemical characteristic, and flocculation efficiency is evaluated to find the best flocculator speed. In laboratory test, it is confirmed that the most efficient baffle wall can be proposed through tracer test. In field test, it is confirmed the bad effect of distribution channel to flocculation basin. From the result, it is proposed to have short detention time between flash-mixing basin and flocculation basin in new WTP design. Through the test of the flocculation efficiency of the 3-types baffle wall the more compatible baffle wall can be decided. And it is certified that tapered flocculation is the most effective operation. Pilot plant study is the most essential in the design and operation of flocculation basin.
Assessment of Residential Building
Seo, Seong-Won ; Hwang, Yong-Woo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_5, 1998, Pages 521~521
emissions from whole life cycle of various types of residential building are estimated. For this, the life cycle of residential buildings was divided into four stages, from construction, operation, demolition to transportation, and the amount of
production in each stage was quantified. As the result,
emission resulting from construction stage ranged
for each building type. However,
emission throught the residential building life cycle was mostly due to the building operation having
emission. Comparing the building types, detached house using LPG as main heating energy source had the lowest
emission having 5.26 ton-carbon per
of floor area during the 22.4 years of life cycle On the other hand, detached house using briquet as main heating energy source had the highest
emission having 2.4 times as large as the case using LPG.