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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 16, Issue 3_6 - Nov 1996
Volume 16, Issue 2_6 - Nov 1996
Volume 16, Issue 1_6 - Nov 1996
Volume 16, Issue 3_5 - Sep 1996
Volume 16, Issue 2_5 - Sep 1996
Volume 16, Issue 1_5 - Sep 1996
Volume 16, Issue 3_4 - Jul 1996
Volume 16, Issue 2_4 - Jul 1996
Volume 16, Issue 1_4 - Jul 1996
Volume 16, Issue 3_3 - May 1996
Volume 16, Issue 2_3 - May 1996
Volume 16, Issue 1_3 - May 1996
Volume 16, Issue 3_2 - Mar 1996
Volume 16, Issue 2_2 - Mar 1996
Volume 16, Issue 1_2 - Mar 1996
Volume 16, Issue 3_1 - Jan 1996
Volume 16, Issue 2_1 - Jan 1996
Volume 16, Issue 1_1 - Jan 1996
Selecting the target year
A Conceptual Modeling of Sediment Processes: Part I-Model of Broad Shallow Flow
Jung, Kwan-Sue ; Lopes, Vincente L. ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 109~109
The governing equations relevant to process-based modeling of broad shallow flow sediment processes on small watersheds are presented and the effects of space and time averaging on the predictive equations are described. Specific model formulations are given for illustrative purposes and applications of these models to erosion and sediment yield prediction from broad shallow flow areas are shown using sediment data from rainfall simulator plots. In spite of some progress made in the development of process-based erosion and sediment yield models from broad shallow flow areas, further developmental modeling efforts must be based on a clear separation between hydrologic and hydraulic processes, and the soil properties which are significant for each.
A Conceptual Modeling of Sediment Processes: Part II-Model of Concentrated Flow
Jung, Kwan-Sue ; Lopes, Vincente L. ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 121~121
Starting from the most general one dimensional, unsteady model of sediment processes, simpler model structures are obtained and the successive simplification made on the governing equations to obtain simpler and less detailed formulations at described are described. Examples of computer implementations of the various approaches using specific formulations are given. Identification and quantification of differences and similarities of watershed behavior remain important and active areas of experimental research on process based sediment modeling. Future research priorities in the area of runoff and sediment process modeling must address the development of boundary conditions; model components (system complexity): the scales over which the equation are valid; and integration of the equations in space and time.
A Sediment Budget Analysis on Upstream of Jamsil Submerged Weir
Lee, Kil-Seong ; Lee, Nam-Joo ; Oh, Seong-Taek ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 135~135
The objectives of this study are to do a sediment budget analysis and to provide basic data to be used in a sediment transport model. The application region is a channel reach of about 2km from the upstream of the Olympic Bridge to the Jamsil submerged weir. A water budget analysis was made using the data of the Paldang Dam discharges, the water intakes at upstream of the Jamsil submerged weir, the lateral inflows from the tributaries, and the discharges passing through the Jamsil submerged weir. We found a tendency of the bed-level changes from the results of the water budget analysis and the annual geomorphic data. Using the results of the boring survey for bed materials, we could obtain the component ratios of silt and clay sand, and gravel. And we analysed the depositing tendency of each bed material. We performed a sediment budget analysis using the results of a water budget analysis, the bed materials and the bed-elevation data, and the sediment transport formula. In this region, the result of the Ackers-White formula was better than those of the Engelund-Hansen and the van Rijn formulas.
Local Bed Scour Due to Bridge Pier in a Bend
Roh, Sub ; Song, Jai-Woo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 149~149
In this paper local bed scour due to bridge pier in a bend was studied by laboratory flume experiments. After three types of pier shape were located in a straight course (No. 6) and in a bend (No.
in each place) which were place of center, inner bank side and outer bank side of flume, local bed scour shapes and characteristics were compared and analysed with each measured points. According to the results of experiments, each measured points in a bend the maximum scour depth increased from the inner bank side to the outer bank side. At the inlet of a bend (No. 8), the maximum scour depth increased about 10% with no relation to pier shapes. The amounts of maximum scour depth with pier shapes were increased circular semi-circle rectangular, rectangular pier in the order named. In a straight course, the scour length of front side piers and width of inner and outer side piers were almost the same values. In a bend, the scour length of front side piers and width of outer side piers were the same values but the scour width of inner side piers were longer about
times (circular pier twice, semi-circle rectangular pier 3 times. rectangular pier 6 times) than the length of front side or width of outer side piers. Around the bridge piers in a bend, sprial flow which were caused by one of the bend flow characteristics added to the existed horseshoe vortex because the locations of maximum scour depth usually happened to front-inner side piers and the scour width increased in the inner side piers.
Evaluation of Evapotranspiration Models for Limited Soil Water Condition
Rim, Chang-Soo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 159~159
Meteorological and environmental (i.e. soil water content) data measured from semiarid watersheds (Lucky Hills and Kendall) during the summer rainy period were used to find the relationship between actual evapotranspiration (AET) and potential evapotranspiration (PET) as a function of an environmental factor such as soil water content. The, relationship between AET and PET as a function of soil water content as suggested by Thornthwaite and Mather, Morton and Priestley-Taylor was studied to find the realistic meaning of the concepts and possibilities of application of the concepts in the study area. However, the test results of three different approaches. using the relationships between AET and PET as a function of soil water content indicated some inadequacy. The low correlation between PET AET and soil moisture conditions raised some doubt concerning the validity of methods developed elsewhere, and indicated the effects of energy availability on the relationship between PET AET and soil water content regardless of soil water condition. These analyses were repeated using only non-rainy days (precipitation < 2mm/day), but the test results also indicated the effects of energy availability.
Effects of COD/P Ratio and VFA on Enhanced Biological Phosphorus Removal in SBR
Shin, Hang-Sik ; Lee, Sang-Min ; Jun, Hang-Bae ; Lim, Kyeong-Ho ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 173~173
Since the importance of nutrient removal was raised to cope with eutrophication of water resource, many nutrient removal technologies have been studied. However, until now, physical and chemical technologies were generally preferred to biological technology and biological technology were hesitated to employ operating parameters for field application because it was lack of stability. Among of several parameters for biological phosphorus removal system, COD/P ratio and the volatile fatty acids (VFA) affect on sequencing batch reactor (SBR) were studied to enhance the biological excess phosphorus removal (BEPR) potential. From the results of using sewage, we found that COD/P ratio could take a key role to predict and control phosphorus removal. When the COD/P ratio was higher than 20, phosphorus removal was over 90%. However, when it was lower than 20, phosphorus removal increased with COD/P ratio. During the operation. organic acid produced from sludge digestion was added in for enhanced and stable BEPR. The organic acid as VFA source facilitated poly-
-hydroxyl butylate (PHB) formation and phosphorus release in anaerobic condition.
Removal of Taste and Odour Causing Compounds and THM Precursors by Biological Treatment
Shin, Hang-Sik ; Lim, Kyeong-Ho ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 183~183
As the quality of raw water deteriorates, a number of additional treatment techniques have been developed and adapted to water treatment. Biofilm process for the pre treatment of water is suitable for advanced treatment as biofilms we more effective form of microbial at low organic concentrations. This paper described the experimental result of water treatment by submerged biofilms, which allows two odorous compounds (geosmin and 2-MIB) and trihalomethane precursor (THMP) to be removed biologically. The bench-scale biofilm reactors were operated at the HRT of 30min. 1hr, 2hr and 3hr, respectively. The biofilm was established using Daechung Lake water. A synthetic water containing geosmin and 2-MIB was fed to the reactors after the biofilm had reached steady state. Influent and effluent concentrations were monitored. It was found that the submerged bioreactors remove the taste and odor compounds by the mechanism of air stripping and secondary substrate utilization. The bioreactor did not effectively remove the THM precursors when the reactor had the partial plugging problems. A submerged biofilm, however, which is acclimated and which have no clogging problems could be recommended as a primary treatment process for the removal of taste and odor compounds as well as THMP. The measured turbidity and total organic carbon (TOC) might be able to be used as a surrogate parameter to evaluate the THMP content in water treatment plant.
Hydrogenotrophic Organism Behavior in High Hydrogen Partial Pressure Environment
Min, Kyung-Sok ; Ahn, Young-Ho ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 193~193
In this study, hydrogenotrophic organism behavior contributing anaerobic pelletization was evaluated in high hydrogen partial pressure
condition. Especially, syntrophic relationship between acidogenic and hydrogenotrophic organism was investigated by molecular hydrogen and nitrogen balance in terms of pH condition. Under high
environment, hydrogenotrophic organism was contributed to pelletization process with high specific cell yields and extracellular polymer (ECP) excretions. In case of pH 7.0 condition, molecular hydrogen with about 15% of influent COD was produced, and 70% of produced hydrogen and 60% of influent nitrogen were utilized for growth of hydrogenotrophs and formation of biopolymer. Therefore, optimum pH condition for the high
zone occurring pelletization process in UASB system was 7.0.
Determination of Operational Parameters for TCE Degradation in Photocatalytic Oxidative Reactors
Choung, Youn-Kyoo ; Ko, Kwang-Baik ; Cheon, Seung-Yul ; Kim, Ku-Youn ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_2, 1996, Pages 201~201
The major objectives of this study are to manufacture an efficient
photocatalyst, and to delineate optimum operational parameters for TCE (Trichloroethylene) degradation in a photocatalytic oxidative reactor. The
photocatalyst, irradiated by 365nm UV light, should be expected to increase degradation efficiencies of TCE in solution by the series of photocatalytic oxidations in the reactor. A new membrane
photocatalyst was eventually developed by coating a mixture of Davan-C (0.24 wt%) and PVA (0.16 wt%) on the surface of slips using the slipcasting method. The experimental results shows that an increase in the number of coating of
sol on photocatalyst's surface and in the surface thickness improved the endurance and strength of photocatalysts, but these physical modification caused the overall degradation efficiencies to significantly reduce. Preaeration or recirculation of the influents containing TCE increased its degradation efficiency. The optimum operational conditions for the surface area of photocatalysts and UV light intensity appeared to be
, respectively, in the reactor. Based on the overall experimental results, the photocatalytic oxidation of TCE with the new membrane
photocatalyst is found to be very effective under the operational conditions delineated in this study.