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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
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
An Experimental Study on Hydraulic Characteristics Around Cutter-Head for Dredging
Park, Jae Hyeon ; Kim, Young Do ; Chae, Dong Seok ; Lee, Man Soo ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 491~497
In this study, the flow characteristics around the cutter head, which makes the dredging soil suspended, were measured to evaluate the environmental affect of the dredging works. The PIV was used for measuring the flow characteristics around the cutter head for suction and non-suction cases. As the results, the mean velocity was decreased from the cutter head to outward. The mean velocity decreasing rate of the non-suction case was larger than that of the suction case, but the turbulence intensity decreasing rate of the non-suction case was smaller than that of the suction case because of the suction energy which makes the z-direction flow.
An Experimental Study on Selective Withdrawal from Linear Stratified Tank
Kim, Young Do ; Park, Jae Hyeon ; Son, Byung Ju ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 499~505
The mixing behavior of turbidity currents in a reservoir is closely related with the annual temperature change of the reservoir. In the summer, the reservoir has a well defined structure: one or two thermoclines and some layers of different densities. This density stratification inhibits vertical mixing and affects various hydrodynamic processes within the reservoir. Therefore, many reservoirs can be operated to release water of the specific quality with the selective withdrawal. In this study, the hydraulic experiments were performed to analyze the efficiency of selective withdrawal. The velocity distributions are measured with PIV in the stratified tank with the "two-tank" method. The relationship between the Richardson number and the selective withdrawal efficiency are provided using the measured velocity distributions.
Horizontal 2-D Finite Element Model for Analysis of Mixing Transport of Heat Pollutant
Seo, Il Won ; Choi, Hwang Jeong ; Song, Chang Geun ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 507~514
A numerical model has been developed by employing a finite element method to simulate the depth-averaged 2-D dispersion of the heat pollutant, which is an important pollutant material in natural streams. Among the finite element methods, the Streamline Upwind/Petrov Galerkin (SUPG) method was applied. Also both linear and quadratic elements can be applied so that irregular river boundaries can be easily represented. To show the movement of heat pollutants, the reaction term describing heat transfer was represented as an equation in which sink/source term is proportional to the difference between the equilibrium temperature and water surface temperature. The equation was expressed so that the water surface temperature changes according to the temperature transfer coefficient and the equilibrium temperature. For the calibration of the model developed, analytic and numerical results from a case of rectangular channel with full width continuous injection have been compared in a steady state. The comparisons showed that the numerical results were in good agreement with analytical solutions. The application site was selected from the downstream of Paldang dam to Jamsil submerged weir, and overall length of this site is about 22.5 km. The change of water temperature caused by the discharge from the Guri sewage treatment plant has been simulated, and results were similar to the observed data. Overall it is concluded that the developed model can represent the water temperature changes due to heat transport accurately. But the verification using observed data will further enhance the validity of the model.
Verification of Two Dimensional Hydrodynamic Model Using Velocity Data from Aerial Photo Analysis
Seo, Il Won ; Kim, Sung Eun ; Minoura, Yasuhisa ; Ishikawa, Tadaharu ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 515~522
The hydrodynamic models are widely used in the research for analysis of flow characteristics and design of hydraulic structure and river channel. These models need to be calibrated with observed data. But, there are few field data of two-dimensional flow velocity in flood because the direct measurement of the flood flow velocity are very dangerous. For this reason the results of two-dimensional numerical models are usually calibrated and verified with only a few observed data. Moreover, the verification of numerical models for the design flood is usually carried out using the result of one-dimensional model, HEC-RAS. In this study, using the flow velocity profile extracted from the aerial photos of a flood of the Tone River in Japan, two-dimensional numerical models, RAM2 in RAMS, RMA2 in SMS, and one-dimensional numerical model, HEC-RAS which are most widely used in research and design work are verified and the validity for verification of two-dimensional models with HEC-RAS is reviewed. The results showed that the water surface elevation of HEC-RAS, RAM2 and RMA2 models have similar results with observed data. But, the velocity results of RAM2 and RMA2 models in the floodplain have some difference with the velocity from aerial photo analysis. And the velocity result of HEC-RAS has big difference with the sectional averaged value of velocity from aerial photo analysis.
Relation between Measured and Calculated Velocities in a Tidal River
Namgung, Don ; Lee, Jin Woo ; Cho, Yong-Sik ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 523~529
A tidal river is a river affected by tides causing the water level to rise and fall. In the river, the velocity induced by tides at a dry season can be a more dominant factor than that at a flood season in designing hydraulic structures. In this study, flow velocities and water levels were observed in the downstream of Han River at the dry season, and they are used for verification of numerically predicted results. The behaviors of flow were also analyzed by using UNET, a commercial model managing unsteady flows. To estimate the roughness coefficients of the tidal river reach near the Shingok submerged weir, a statistical method is employed. In the method, the discrepancy ratio between the measured and calculated water levels was implemented.
Development of Geometric Moments Based Ellipsoid Model for Extracting Spatio-Temporal Characteristics of Rainfall Field
Kwon, Hyun-Han ; So, Byung-Jin ; Kim, Min-Ji ; Pack, Se-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 531~539
It has been widely acknowledged that climate system associated with extreme rainfall events was difficult to understand and extreme rainfall simulation in climate model was more difficult. This study developed a new model for extracting rainfall filed associated with extreme events as a way to characterize large scale climate system. Main interests are to derive location, size and direction of the rainfall field and this study developed an algorithm to extract the above characteristics from global climate data set. This study mainly utilized specific humidity and wind vectors driven by NCEP reanalysis data to define the rainfall field. Geometric first and second moments have been extensively employed in defining the rainfall field in selected zone, and an ellipsoid based model were finally introduced. The proposed geometric moments based ellipsoid model works equally well with regularly and irregularly distributed synthetic grid data. Finally, the proposed model was applied to space-time real rainfall filed. It was found that location, size and direction of the rainfall field was successfully extracted.
Water Quality Improvement Using Inverted Siphon Curved Channel System of Serial Contact Materials
Lee, Jong-Seok ; Lee, Seung-Young ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 541~550
This study sets the goal to improve effectively water quality of stream by complementing the weak points of the gravel contact oxidation process to use the inverted siphon curved channel system in free overfall of serial contact materials. The size of the current system can be diminished by expanding contact time, and the materials' replacement can be made easier when their gap are closed through the filtering boxes of contact materials. This system also has been developed into a construction method in which mixed and serial contact materials can be employed by using just the conventional single contact materials. It was verified the improvement ability of water quality of this system, during the simulation test at Tandong stream in Daejeon. The results of the verification of water quality improvement through several experiments in field were measured as follows : it showed to reduce about the averaged 55~83% higher than 60~75%, the internal planned goal of water quality improvement facilities.
Development of MCDM for the Selection of Preferable Alternative and Determination of Investment Priority in Water Resource Projects
Yeo, Kyudong ; Kim, Gilho ; Lee, Sangwon ; Choi, Seungan ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 551~563
Water resource projects need an enormous national budget. Therefore, a reasonable and reliable decision making is required for the planning of water resource projects, but decision making has been mostly performed by economic analysis. The objective of this study is to develop a Multi-criteria Decision Making(MCDM) model which can assess the project in various aspects for the selection of preferable alternative and determination of investment priority in water resource projects. In this study, the criteria involves economic feasibility, policies, vulnerability, and sub-items which have weights obtained from the expert survey for the consistent evaluation. We also derived the utility function considering risk trend of each item based on the expert survey. Then, the total score was estimated by weights of each item and utility score of each attribute. The results show that vulnerability is a major contributor for the criteria. This study will contribute to the selection of proper water resource projects considering efficiency of project and fairness for vulnerable area.
Evaluation on Functional Assessment for Fish Habitat of Underground type Eco-Artificial Fish Reef using the Index of Biological Integrity (IBI) and Qualitative Habitat Evaluation Index (QHEI)
Ahn, Chang Hyuk ; Joo, Jin Chul ; Kwon, Jae Hyeong ; Song, Ho Myeon ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 6B, 2011, Pages 565~575
The purpose of this study was to quantitatively evaluate the expression of both multi-metric qualitative habitat evaluation index (QHEI) and biological integrity index (IBI) for artificial structures eco-artificial fish reef (EAFR) for fishes asylum and habitat. Especially, both experimental evaluation and biological verification were performed in Water and Environmental Center's outdoor test-bed of Korea Institute of Construction Technology located in Andong-city, Gyeongsangbuk-do. The experimental conditions reflecting the situation of domestic river include the flow rate (e.g.,
), the width (e.g., 1.0~3.0 m), the depth (e.g., 0.05~0.70 m), and variable bed materials. Both QHEI and IBI were monitored for 8 months from May to December 2010. Whereas QHEI values were highest at experimental points of the E~F with an average of 83.1, those were lowest at B~C with an average of 78.1. However, QHEI values inside EAFR were more than 98.9, regardelss of space and time, and indicated more than the highest good of the state (Good) in the habitat. Overally, IBI values showed similar trend with QHEI, but were 44.2 in the winter dry season, compared to 32.8 of QHEI values. IBI values Also, IBI values inside EAFR were greater than those at the experimental channel by 5.7 to 11.4% and 18.7 to 34.8% in flow and stagnant conditions, respectively, indicating that EAFR can secure asylum and habitat for fish during the dry season. For comprehensive aquatic ecosystem assessment, the experimental channel showed generally fair conditions (Fair~Good), whereas EAFR showed good conditions (Good), suggesting that EAFR can be applied to aquatic ecosystem restoration and improvement.