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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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Korean Society of Civil Engeneers
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Volume & Issues
Volume 31, Issue 6D - Dec 2011
Volume 31, Issue 6C - Dec 2011
Volume 31, Issue 6B - Dec 2011
Volume 31, Issue 6A - Dec 2011
Volume 31, Issue 5D - Oct 2011
Volume 31, Issue 5C - Oct 2011
Volume 31, Issue 5B - Oct 2011
Volume 31, Issue 5A - Oct 2011
Volume 31, Issue 4D - Aug 2011
Volume 31, Issue 4C - Aug 2011
Volume 31, Issue 4B - Aug 2011
Volume 31, Issue 4A - Aug 2011
Volume 31, Issue 3D - Jun 2011
Volume 31, Issue 3C - Jun 2011
Volume 31, Issue 3B - Jun 2011
Volume 31, Issue 3A - Jun 2011
Volume 31, Issue 2D - Apr 2011
Volume 31, Issue 2C - Apr 2011
Volume 31, Issue 2B - Apr 2011
Volume 31, Issue 2A - Apr 2011
Volume 31, Issue 1D - Feb 2011
Volume 31, Issue 1C - Feb 2011
Volume 31, Issue 1B - Feb 2011
Volume 31, Issue 1A - Feb 2011
Selecting the target year
Analysis of Discharge Characteristics for a Control Gate in a River
Son, Kwang Ik ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 309~314
Analysis of discharge characteristics through control gates at river crossing structures is important for an effective water level control and water resources management. In recent years, many river control structures in four major rivers are under construction but only few researches on discharge characteristics at control gates could be found in Korea. The discharge characteristics depend on both shape of control gates and the effects of downstream water-depth. In this research, classification index for discharge patterns (free weir, submerged weir, free orifice, submerged orifice) through a control gate were reviewed with
. Classification criteria of discharge patterns were also suggested. Representative discharge estimation equations for each discharge patterns were adopted and discharge coefficients were developed from a hydraulic model for a specific control gate which will be constructed in Nakdong river. Reliability of the derived discharge equation and coefficients were confirmed by comparisons between the real discharge in a model and the predicted discharge from the results of this research.
Improvement of Weiss Model on the Conversion Factor of Fixed- to True-Interval Rainfall
Yoo, Chulsang ; Jun, Chang Hyun ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 315~322
This study reviewed the Weiss model, probably the only theoretical study available on the fixed- to true-interval rainfall conversion factor (CF), and implemented to propose a modified Weiss model. Also, the characteristics of the temporal distribution of rainfall were considered in the estimation of CF to overcome the problem of these two models, whose results were compared with those estimated empirically. As results, the CF was found to be differently estimated depending on the temporal distribution of rainfall. Especially, the theoretical CF estimate for the center-concentrated rainfall distribution was found to be very similar to that of empirical results of domestic and foreign studies.
Investigation of Critical Breaking Moment through Field Tree-Pulling Test
Im, Dongkyun ; Kim, Won ; Choi, Sung-Uk ; Kim, Yongjeon ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 323~332
In order to properly manage trees in rivers, the impact of trees on flooding and their ecological characteristics need to be considered and a plan needs to be established. The hydraulic impact by trees is reduction of conveyance and hydraulic structure's function due to overturn arising from flow force. A field pulling test was carried out to measure the critical resistance force for when trees break in order to discover the level of resistance that trees inside the river have to external force. The relevant factors for discovering the critical breaking moment for trees include tree species, which determines the external characteristic of trees, tree diameter at breast height, and tree height. In this study, the correlation between critical breaking moment and diameter at breast height were used. The tree's limit or critical breaking moment was tested using 100 shrubs and tall trees with a breast height diameter of 4.9 to 32.8 cm. It was difficult to derive a correlation between diameter at breast height and critical breaking moment when shrubs and tall trees were being considered together, but when only tall trees were considered, a consistent correlation was found between them.
Three-dimensional Numerical Analysis of Dam-break Waves on a Fixed and Movable Bed
Kim, Dae Geun ; Hwang, Gun ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 333~341
This study analyzed the propagation of dam-break waves in an area directly downstream of a dam by using 3D numerical modeling with RANS as the governing equation. In this area, the flow of the waves has three dimensional characteristics due to the instantaneous dam break. In particular, the dam-break flows are characterized by a highly unsteady and discontinuous flow, a mixture of the sharp flood waves and their reflected waves, a mixture of subcritical and supercritical flow, and propagation in a dry and movable bed. 2D numerical modeling, in which the governing equation is the shallow water equation, was regarded as restricted in terms of dealing with the sharp fluctuation of the water level at the dam-breaking point and water level vibration at the reservoir. However, in this 30 analysis of flood wave propagation due to partial dam breaking and dam-break in channels with
bend, those phenomena were properly simulated. In addition, the flood wave and bed profiles in a movable bed with a flat/upward/downward bed step, which represents channel aggradation or degradation, was also successfully simulated.
Influence of Water Supply Withdrawal on the River Flow and Water Quality
Seo, Il Won ; Song, Chang Geun ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 343~352
The water quantity by intake station as well as the tributary flow discharge acting as sink or source were added to the main flow rate in the present study and RMA-2 and RMA-4 models were applied to the reach from Pal-dang dam to Jam-sil submerged weir to investigate the influence of water supply withdrawal on the river flow and water quality. The numerical results revealed that the water supply withdrawal from 5 intake stations located upstream of Jam-sil submerged weir changed the total flow rate and therby induced different hydraulic characteristics in terms of water surface elevation and velocity. The changed flow field by the inclusion of water intake quantity led to the variation of water quality. By the consideration of the water supply withdrawal, the velocity structure was significantly disturbed by the outflowing flow condition nearby Gu-ui, Ja-yang, and Pung-nap intake stations. Furthermore, the mean velocity was lowered by 25% and the stage upstream of Gu-ui station rose upto 1.5 cm compared with the result by exclusion of water intake. In case of no water withdrawal, the distribution of BOD concentration was parallel throughout the domain. However, when the water withdrawal is considered, the distribution of BOD concentration nearby the Gu-ui, Am-sa, and Ja-yang station was signifiantly changed. In addition, the BOD concentration including the intake stations showed higher value at the downstream of the reach due to the loss of the discharge by water withdrawal effect. It is concluded that both the inflow and outflow discharges from tributaries and water intake stations should be included in the numerical simulation to analyze the hydrodynamic behaviors and mixing characteristics more accurately.
Temporal Variation of Local Scour Depth in the Downstream of Weir with Shapes
Yeo, Chang Geon ; Lee, Seungoh ; Yoon, Sei Eui ; Song, Jai Woo ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 353~360
The objectives of this study were to analyzes temporal variation of local scour depth in the downstream of weir with shapes. Prediction of maximum or equilibrium scour depth was the main focus of engineers and researchers in the downstream of weir. However, it is necessary to analyzes temporal variation of local scour depth in the downstream of weir to predict real time scour depth. Experiment were performed with various weir shapes like sharp crest and inclined stepped with time variation and non-dimensional scourhole shapes, scour depths were proposed. A formula for predicting scour depths with temporal variation for weir were proposed through non-linear regression analysis. Temporal variation of scour depths could be estimated with suggested formula and 4 input data (Equilibrium scour depth, weir height, overflow depths, and water depth downstream). Suggested formula could make it possible to design a apron and bed protection economically in the downstream of a weir by considering flood duration time.
Channel-forming Discharge Evaluation for Rivers with High Coefficients of River Regime
Ji, Un ; Jang, Eun Kyung ; Yeo, Woon Kwang ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 361~367
The channel-forming discharge, which is a standard and single flow for the river maintenance and restoration project, should be estimated necessarily in the stable channel design. It is difficult to produce the specific pattern for the channel-forming discharge in the domestic rivers due to the insufficient researches and case studies. Also, it is improper to adopt the foreign cases for the domestic rivers and streams which have the high coefficients of river regime. Therefore, the channel-forming discharge possible to use for rivers with high coefficients of river regime is suggested in this study through analyzing the bankfull, specified recurrence interval, and effective discharges of Mangyeong River, Cheongmi Stream, and Hampyeong Stream for the abandoned channel restoration project. The bankfull discharge was calculated with geometric data using the HEC-RAS modeling and the flow, bed materials, and sediment data for the study reaches were used to estimate the specified recurrence interval and effective discharges. As a result for calculating the channel-forming discharge, the effective discharge was greater than the bankfull discharge in the river with high coefficient of river regime and the effective discharge was greater than the bankfull and there was no correlation between the coefficient of river regime and the characteristics of the specified recurrence interval discharges.
Hindcast of Storm Surge in the Southeastern Coast Using a Three-Dimensional Numerical Model
Kim, Cha-Kyum ; Lee, Jong Tae ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 369~376
A three and two dimensional (3D and 2D) numerical models were established to study the storm surge induced by Typoon Maemi in Masan and Pusan Ports. The typhoon landed on the southern coast of Korean Peninsula at 21:00, September 12, 2003 with a central pressure of 950 hPa. The observed maximum storm surge in Masan Port was 230 cm, and the computed peak storm surge using the 3D and the 2D models were 238 cm and 208 cm, respectively. The observed maximum storm surge in Pusan Port was 89 cm, and the peak storm surge of the 3D and the 2D models were 91 cm and 79 cm, respectively. The hindcasted storm surge using 3D model was in good agreement with the observed data, and the 3D model at peak time was more accurate than the 2D. The storm-induced currents were computed using the 3D model. The currents in the surface layer of Masan Bay went into the inner bay with 30~60 cm/sec, while the currents in the bottom layer flowed out with 20~40 cm/sec.
A Study about Development of Hydrogen Peroxide Stabilizer in Modified Fenton Reaction Using Anion Surfactant
Kim, Han Ki ; Park, Kang Su ; Kim, Jeong Hwan ; Park, Joo Yang ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 377~382
In this study, hydrogen peroxide is stabilized in modified Fenton reaction to improve the soil remediation. Phenanthrene, which is the typical compound in PAHs, was spiked into soil samples to copy the original contaminated site. Anionic surfactant, SDS (Sodium dodecyl sulfate) was used for hydrogen peroxide stabilizer. 4 mM of Fe(II), 5~50 mM of SDS and 102.897 mM of
was injected into soil samples which is contaminated by 125 mg/kg of phenanthrene to analyze decomposition rate of phenanthrene in modified Fenton reaction. In condition which SDS was injected 30 mM, decomposition rate of phenanthrene has best efficiency as 95% and in condition which SDS was injected over 30 mM, decomposition rate is lower than SDS 30 mM because SDS enacted as scavenger in the system. Results which assess the change of hydrogen peroxide concentration after injecting hydrogen peroxide stabilizer showed that hydrogen peroxide concentration was 14.6995 mM so that is stabilized at Fe(II) 2 mM condition in 48 hours. On the other hand, hydrogen peroxide is not stable in Fe(III) condition. SDS concentration was fixed and iron concentration was changed 2~8 mM to find out optimize proportion between iron concentration and SDS concentration in modified Fenton reaction. Consequentially, in condition of which Fe(II) 4 mM and SDS 30 mM, reaction has the highest removal rate as 95%.
A Study on the Evaluation Method of Ecologically Fragmented Section for Restoration of the Riverine Ecobelt
Kang, Hyeongsik ; Lee, Young Sook ; Jeon, Seung Hoon ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 4B, 2011, Pages 383~391
In this study, an evaluation method was proposed to determine the restoration section in the riverine ecobelt project. The target river for this study is the Hongcheon river in Kangwon-do. The Hongcheon river of 96 km was divided longitudinally into subsections of 2 km. The analysis through map and aerial photograph as well as field surveys were performed in 48-sub-sections. The fragmentation items were classified into connectivity and ecological functionality. The connectivity fragmentation was also divided into two items: the area discontinuity of the land use and the line discontinuity of river bank and road. Also, the ecological functional fragmentation was evaluated by using the items of river channel, river bed, vegetation, and the obstruction of river flow. These items was modified from those in the previous literature. From map analyses and field surveys, the fragmentation score was kept with each items in 48 sub-sections of Hongcheon river. The fragmentation rate was made from the total score in each section. The results showed that sections from F1 to G2 was evaluated to have high rates of all connectivity and functionality fragmentation of 1st or 2nd rate. Other sections have high connectivity fragmentation of 2nd rate, but low functional fragmentation. Thus, these sections are evaluated to be excludible in restoration site. This study seems to make a contribution to evaluate the fragmented sections for the riverine ecobelt project.