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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 30, Issue 6D - Dec 2010
Volume 30, Issue 6C - Dec 2010
Volume 30, Issue 6B - Dec 2010
Volume 30, Issue 6A - Dec 2010
Volume 30, Issue 5D - Oct 2010
Volume 30, Issue 5C - Oct 2010
Volume 30, Issue 5B - Oct 2010
Volume 30, Issue 5A - Oct 2010
Volume 30, Issue 4D - Aug 2010
Volume 30, Issue 4C - Aug 2010
Volume 30, Issue 4B - Aug 2010
Volume 30, Issue 4A - Aug 2010
Volume 30, Issue 3D - Jun 2010
Volume 30, Issue 3C - Jun 2010
Volume 30, Issue 3B - Jun 2010
Volume 30, Issue 3A - Jun 2010
Volume 30, Issue 2D - Apr 2010
Volume 30, Issue 2C - Apr 2010
Volume 30, Issue 2B - Apr 2010
Volume 30, Issue 2A - Apr 2010
Volume 30, Issue 1D - Feb 2010
Volume 30, Issue 1C - Feb 2010
Volume 30, Issue 1B - Feb 2010
Volume 30, Issue 1A - Feb 2010
Selecting the target year
Characteristics of Inter-monthly Climatic Change Appeared in Long-term Seoul Rainfall
Hwang, Seok Hwan ; Kim, Joong Hoon ; Yoo, Chul Sang ; Lee, Jung Ho ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 1~11
In this study, To analyzed the monthly long-term change characteristics of Chukwooki rainfall data set (CWK) and modern rain gage rainfall data set (MRG), tests of trend or variation were performed of each data sets using five statistical trend or variation test method. furthermore, changing characteristics of rainfall was analyzed through the accomplishment of the 2-dimensional LOWESS regression (or smoothing) which can consider both annual time-variation and inter-monthly time-variation. From the trend test, it is difficult to confirm that given data sets have significant trends. From the 2-dimensional LOWESS analysis for four rainfall characteristics, after near A.D. 1980, inter-monthly variation width in addition to quantative increment of rainfall are increased rapidly and persistently.
Effectiveness Analysis of Constructed Washland : (1) Flood Control and Ecological Effect
Kwak, Jae Won ; Kim, Jae Guen ; Kim, Hung Soo ; Yoo, Byung Kook ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 13~21
In recent, we have a growing interest in the washland construction as a measure of flood control and as a wetland with ecological function in the river. This study performed the flood control analysis and investigated the ecological effect for washland construction plan in Topyoung-cheon basin in Changyeong-gun, Gyeongnam. Several cases were considered for the washland construction on Topyoung-cheon basin, and we analyzed flood stage reduction and flood inundation for each case. From the result of flood control analysis, we found some significant results according to the combination of each washland case. We also found that the washland construction gave the positive results in biodiversity. Therefore, it will be desirable to consider various effects such as flood control, ecological aspects, and so on for the washland construction.
Effectiveness Analysis of Constructed Washland : (2) Economic Valuation
Yoo, Byung Kook ; Kwak, Jae Won ; Kim, Hung Soo ; Kim, Jae Guen ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 23~31
The previous researches on washland construction have focused on the flood control effect or flow discharge change. In spite of the previous studies, the washland construction has lacks of representing its reasonable value and effects. Therefore, this study tried to perform the economic value analysis based on flood damage reduction, water quality improvement, ecological effectiveness, and socio-cultural effect for the washland construction plan in Topyeong-cheon basin in Changyeong-gun, Gyeongnam. The results of value analysis showed the economic value of about 87.6 billion won was estimated and this could contribute to the realization of the effect and importance of washland construction.
Estimating the Amounts of Long-term Cohesive Sediment Deposition in Two Tide-dominated Bays of South Korea: Numerical Study
Kang, Min Goo ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 33~40
In this study, a two-dimensional hydrodynamic and sediment transport modeling system, HSCTM-2D is employed to simulate the amounts of long-term cohesive sediment deposition in two study bays, and its applicability is evaluated. The modeling system's two modules for hydrodynamic modeling and sediment transport modeling are calibrated, comparing the simulated results and the observed tidal levels, tidal current velocities, and suspended sediment concentrations in the Asan and the Cheonsu Bays, South Korea. It is found that there are good agreements between the simulation results and the observed values. The amounts of long-term cohesive sediment deposition of the two study bays are estimated using the modeling system, taking the suspended sediment concentrations from the open ocean in the tide-dominated environment into account. And, in the case of the Asan Bay, the annual deposition rate reaches 8.1 cm/yr; the Cheonsu Bay, 14.5 cm/yr. Overall, it is concluded that the modeling system is useful to understand the physical process of cohesive suspended sediment transport and deposition in tidal water bodies and to establish the mitigation strategy.
Analysis on the Effects of Flood Damage Mitigation according to Installation of Underground Storage Facility
Kim, Young Joo ; Han, Kun Yeun ; Cho, Wan Hee ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 41~51
In this study, runoff simulation was carried out in the area of Bisan 7-dong, Seo-gu, Daegu as drainage basin and the effects of the installation of underground storage facilities were analyzed during heavy rainfall. SWMM model was used for the runoff and pipe network analysis on Typhoon Maemi, 2003. 2-D inundation analysis model based on diffusion wave was employed for inundation analysis and to verify computed inundation areas with observed inundation trace map. The simulation results agree with observed in terms of inundation area and depth. Also, the effects of flood damage mitigation were analyzed through the overflow discharge and 2-D inundation analysis, depending upon whether the underground storage facility is installed or not. When the underground storage facility (
) is installed, volume of overflow could be reduced by 72% and flooding area could be reduced by 40.1%. When the underground storage facility (
) is installed, volume of overflow could be reduced by 84.8% and flooding area could be reduced by 50.6%. When the underground storage facility (
) is installed, volume of overflow could be reduced by 94% and flooding area could be reduced by 91.2%. There is no overflow of manhole, when the height of storage facility is 2.5 m. It is expected that the study results presented through quantitative analysis on the effects of underground facilities can be used as base data for socially and economically effective installation of underground facilities to prevent flood damage.
Assessment of Hwapo riverine wetland function using Hydrogeomorphic Approach
Yin, Shanhua ; Kim, Duck Gil ; Kim, Hung Soo ; Kwak, Jae Won ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 53~60
A wetland is an ecosystem which has high species diversity, rich nutritional substances and high productivity. In this study we used the HGM(Hydrogeomorphic) approach among various evaluation models for the assessment of the Hwapo riverine wetland function. HGM is a method which estimates the functional index of a study wetland by comparing it with a reference wetland. In this study the Woopo wetland which is registered in the Ramsar Convention was selected as a reference wetland to assess the functional index of the Hwapo wetland. As the results, we obtained the functional index values over 0.6 for most indices of the Hwapo riverine wetland. Therefore we found that the Hwapo riverine wetland shows relatively high functional index values comparing with the Woopo wetland and it has valuable hydrological, biochemical, plant habitat, and animal habitat functions.
Development of Flood Risk Index using causal relationships of Flood Indicators
Lim, Kwang Suop ; Choi, Si Jung ; Lee, Dong Ryul ; Moon, Jang Won ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 61~70
This research presents a methodology to define and apply appropriate index that can measure the risk of regional flood damage. Pressure-State-Response structure has been used to develop the Flood Risk Index(FRI), which allows for a comparative analysis of flood risk assessment between different sub-basins. FRI is a rational assessment method available to improve disaster preparedness and the prevention of losses. The pressure and state index for flood at 117 sub-basins from the year 1980s until the t 10s showed proportional relations, but state index did not decrease even though response index increased. This shows that pressures for flood damage relatively exceed countermeasure for flood. Thus this means we need to strengthen design criteria for flood countermeasure in the future. The FRI is gradually going down in consequence of continuous flood control projects. Flood risk of Han River and Nakdong River area is relatively lower than that of Geum, Seumjin, and Youngsan River area.
Evaluation of Urban Effects on Trends of Hydrometeorological Variables
Rim, Chang-Soo ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 71~80
This study aimed to figure out the effect of urbanization on meteorological variables (air temperature, wind speed, relative humidity, solar radiation and precipitation) and reference evapotranspiration (RET). The research area of 6 urban areas and 6 rural areas near each urban area was selected. The monthly average daily data were collected from 12 ground stations operated by Korea Meteorological Administration (KMA) and the changes in climate variables were analyzed. Results of annual analysis have shown that the reference evapotranspiration (RET) tends to increase in urban areas while decreasing in rural areas. In particular, due to rising RET in urban areas and decreasing RET in rural areas, we can infer that the urbanization has affected to the RET. Results of monthly analysis showed that the urbanization has effects on the RET of July compared to other months (January, April and October). The yearly and monthly effects of urbanization on RET were closely related to solar radiation, relative humidity and change in temperature, and related to wind speed.
A Basic Study of Stage-discharge Rating Stabilization at the Ssang-chi Gauging Station
Lee, Jeong-Ju ; Kwon, Hyun-Han ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 81~87
On the SSang-chi gauging station, the discharge had been measured by the rod float method for the past twelve years. However the shifts of the rating curves are too big to be accepted. The major factors of rating curve variation were reviewed for shift analysis. To estimate the discharge measured by rod float method, two cross sections and their stages are generally required. But, the rating curves had been derived only with the observed depth of gauging station since the cross sections were not available. To correct the errors, the reference rating curve was developed. In this study, the water surface slopes of the curve were simulated by RMA2 model. The historical rating curves were re-developed by the calculated discharges on the base of the water surfaces. The results show that the range of fluctuation decreased and rating curves in recent years are physically reasonable.
Effectiveness of a Wave Resonator under Short-period Waves and Solitary Waves
Lee, Kwang Ho ; Jeong, Seong Ho ; Jeong, Jin Woo ; Kim, Do Sam ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 89~100
The performance evaluation of a conventional Wave Resonator at the entrance of harbors against solitary wave has been performed using 3D numerical wave flume. A wave resonator has been designed for the attenuation of the transmitted wave energy by trapping the short periodic incident waves only. In this study, however, the controlled performance of the wave resonator by its various widths has been numerically investigated for solitary waves. Source distribution method based on the Green function and the 3D one-field Model for immiscible TWO-Phase flows (TWOPM-3D) using 3D numerical wave flume were used for the short-periodic waves and the solitary waves, respectively, and these models were verified through the comparisons with the previous experimental and numerical results by other researchers. It was confirmed that the wave resonator is effective enough to control the solitary waves as well as the periodic waves when it compares with the case of no resonance system. Further, it was found that there is the optimal width of a wave resonator to attenuate the target solitary waves.
The Effects of Cadmium on Seed Germination and Growth of Sunflower and Rape
Lee, Kwang Kun ; Cho, Han Sang ; Kim, Jae Young ;
Journal of The Korean Society of Civil Engineers, volume 30, issue 1B, 2010, Pages 101~105
Sunflower (Sunking4505) and Rape (Sunmang) are oil-seeds containing high oleic acid, and these are used for the production materials of bio-diesel and applying for phytoremediation. The effect of cadmium on germination rate and the growth of the plants is evaluated. Object seeds were placed in Cd (0, 1.5, 4, 12, 30, 60, 100, 150, 300, 500 mg/L) solutions for seven days, and germination rate, root length, shoot length, seedling length, and dry weight were observed.
, seedling vigor index, and tolerance indices were computed, and data were statistically analyzed by Analysis of Variance (ANOVA). Germination rate as well as root, shoot, and seedling length decreased as the cadmium concentration increased except dry weight. The
of sunflower and rape are 112 and 10 mg-Cd/L, respectively. Only one of the sunflower seeds is germinated at 500 mg-Cd/L whereas rape seeds are not germinated more than 150 mg-Cd/L solution. Root has higher cadmium sensitivity than shoot, and sunflower has higher germination rate, growth, and seedling vigor index than rape. In case of tolerance indices, sunflower has lower value than rape at relatively low concentration, but has higher value at high concentration.