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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 28, Issue 6D - Nov 2008
Volume 28, Issue 6C - Nov 2008
Volume 28, Issue 6B - Nov 2008
Volume 28, Issue 6A - Nov 2008
Volume 28, Issue 5D - Sep 2008
Volume 28, Issue 5C - Sep 2008
Volume 28, Issue 5B - Sep 2008
Volume 28, Issue 5A - Sep 2008
Volume 28, Issue 4D - Jul 2008
Volume 28, Issue 4C - Jul 2008
Volume 28, Issue 4B - Jul 2008
Volume 28, Issue 4A - Jul 2008
Volume 28, Issue 3D - May 2008
Volume 28, Issue 3C - May 2008
Volume 28, Issue 3B - May 2008
Volume 28, Issue 3A - May 2008
Volume 28, Issue 2D - Mar 2008
Volume 28, Issue 2C - Mar 2008
Volume 28, Issue 2B - Mar 2008
Volume 28, Issue 2A - Mar 2008
Volume 28, Issue 1A - Jan 2008
Volume 28, Issue 1D - Jan 2008
Volume 28, Issue 1C - Jan 2008
Volume 28, Issue 1B - Jan 2008
Selecting the target year
Application of Intensity-Duration-Frequency Curve to Korea Derived by Cumulative Distribution Function
Kim, Kewtae ; Kim, Taesoon ; Kim, Sooyoung ; Heo, Jun-Haeng ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 363~374
Intensity-Duration-Frequency (IDF) curve that is essential to calculate rainfall quantiles for designing hydraulic structures in Korea is generally formulated by regression analysis. In this study, IDF curve derived by the cumulative distribution function ("IDF by CDF") of the proper probability distribution function (PDF) of each site is suggested, and the corresponding parameters of IDF curve are computed using genetic algorithm (GA). For this purpose, IDF by CDF and the conventional IDF derived by regression analysis ("IDF by REG") were computed for 22 Korea Meteorological Administration (KMA) rainfall recording sites. Comparisons of RMSE (root mean squared error) and RRMSE (Relative RMSE) of rainfall intensities computed from IDF by CDF and IDF by REG show that IDF by CDF is more accurate than IDF by REG. In order to accommodate the effect of the recent intensive rainfall of Korea, the rainfall intensities computed by the two IDF curves are compared with that by at-site frequency analysis using the rainfall data recorded by 2006, and the result from IDF by CDF show the better performance than that from IDF by REG. As a result, it can be said that the suggested IDF by CDF curve would be the more efficient IDF curve than that computed by regression analysis and could be applied for Korean rainfall data.
Analysis of Runoff Sensitivity for Initial Soil Condition in Distributed Model
Park, Jin Hyeog ; Hur, Young Teck ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 375~381
In this research, a physics based grid-multi layer distributed flood runoff model was developed to analyze discharge for the Namgang Dam Watershed (
) and applied for sensitivity analysis for estimation of parameters, mainly initial soil moisture condition and saturate infiltration coefficient, which have a strong influence on discharge. Capability of the model was evaluated using VER and QER from the results of rainfall-runoff analysis and showed enhanced results of 6% compared to parameters before calibration. As the result with the sensitivity analysis of parameters, the part of the most influence on the runoff was the infiltration coefficient and ratio of layer partition. The total discharge and peak time showed comparatively precise runoff results without the initial calibration of the parameters.
Parameter Optimization and Uncertainty Analysis of the NWS-PC Rainfall-Runoff Model Coupled with Bayesian Markov Chain Monte Carlo Inference Scheme
Kwon, Hyun-Han ; Moon, Young-Il ; Kim, Byung-Sik ; Yoon, Seok-Young ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 383~392
It is not always easy to estimate the parameters in hydrologic models due to insufficient hydrologic data when hydraulic structures are designed or water resources plan are established. Therefore, uncertainty analysis are inevitably needed to examine reliability for the estimated results. With regard to this point, this study applies a Bayesian Markov Chain Monte Carlo scheme to the NWS-PC rainfall-runoff model that has been widely used, and a case study is performed in Soyang Dam watershed in Korea. The NWS-PC model is calibrated against observed daily runoff, and thirteen parameters in the model are optimized as well as posterior distributions associated with each parameter are derived. The Bayesian Markov Chain Monte Carlo shows a improved result in terms of statistical performance measures and graphical examination. The patterns of runoff can be influenced by various factors and the Bayesian approaches are capable of translating the uncertainties into parameter uncertainties. One could provide against an unexpected runoff event by utilizing information driven by Bayesian methods. Therefore, the rainfall-runoff analysis coupled with the uncertainty analysis can give us an insight in evaluating flood risk and dam size in a reasonable way.
Effects of Vegetation Recovery for Surface Runoff and Soil Erosion in Burned Mountains, Yangyang
Shin, Seung Sook ; Park, Sang Deog ; Cho, Jae Woong ; Lee, Kyu Song ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 393~403
While characteristics of topography, soil, and vegetation coverage were surveyed, also surface runoff and soil erosion for each rainfall event were measured to analyze effect of change of land cover conditions in mountain areas, Yangyang, directly after wildfire. Fifteen rainfall events were taken in total during the survey period. The result of this survey appeared that the amount of surface runoff and soil erosion are a great difference between plots with rapidly recovered vegetation and bare plots after wildfire. The burned plots where vegetation recovered rapidly generated two times or more of surface runoff and soil erosion than control plots, as burned plots with bare soil showed about ten times of surface runoff and sediment than control plots. The result of correlation analysis between main parameters of the surface runoff and soil erosion presented that rainfall factors and vegetation factors had significant effects on runoff and soil erosion. The sensitivity of runoff and soil erosion showed specially high correlation with vegetation indices. If the land surface disturbed by wildfire are recovered by natural vegetation as time passes, runoff and soil erosion may be decreased gradually. Because runoff and soil erosion in the areas with rare vegetation or bare soil are generated continuously, the discriminated mediation strategies would be established as condition of each region.
Numerical Modeling for Sedimentation Characteristics of the Lower Nakong River and Sediment Dredging Effects at the Nakdong River Estuary Barrage
Ji, Un ; Julien, Pierre Y. ; Park, Sangkil ; Kim, Byungdal ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 405~411
The Nakdong River Estuary Barrage (NREB) was constructed in 1987 to prevent saltwater intrusion and to provide the sustainable water supply in the upstream channel. Sediment dredging has been conducted to eliminate deposited sediments in the approached upstream channel of the NREB. Fluvial changes and sedimentation problems have been continued due to urbanization and development in the watershed as well as construction of the NREB. However, the sufficient field monitoring and researches for sedimentation characteristics and bed changes have not been performed after construction of the NREB. Therefore, bed elevation changes and seasonal sediment concentration distribution were analyzed using the quasi-steady state model with historical field data in this study. The water surface elevation changes with and without sediment dredging operation were calculated using the developed quasi-steady state model and finally the sediment dredging effects were evaluated.
Analytical Solution for Long Waves on Axis-Symmetric Topographies
Jung, Tae-Hwa ; Lee, Changhoon ; Cho, Yong-Sik ; Lee, Jin-Woo ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 413~419
In this study, we develop analytical solutions for long waves propagating over several types of axis-symmetric topographies where the water depth varies in an arbitrary power of radial distance. The first type is a cylindrical island mounted on a shoal. The second type is a circular island. To get the solution, the methods of separation of variables, Taylor series expansion and Frobenius series are used. Developed analytical solutions are validated by comparing with previously developed analytical solutions. We also investigate various cases with different incident wave periods, radii of the shoal, and the powers of radial distance.
Experimental Study on Energy Transmission Rate of Horizontal Dual Plate by Random Wave System
Kweon, Hyuck-Min ; Kim, Young-Hak ; Kee, Sung Tae ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 421~428
For last decades, the rapid coastal erosion process spreading along Korean peninsular has become a nuisance especially for tourism and local economy. Global warming and sea-level rise demand persistently new coastal protection strategies against the conventional methods using armored structures. In a view of this, Kweon et al. (2007) has proposed a new type of horizontal steel plates for an ideal candidate as eco-friendly detached breakwater systems for global warming era. The breakwater is composed of piles and horizontal porous plates that was devised for the optimized blockage effects and wave energy dissipations. This system provides outstanding performances as wave barrier and added advantages such as a rapid installation, an easy relocation, a perfect water circulation for the stagnation of pollutions in sheltered regions. The present experimental study focuses on the performance evaluations of the proposed system in wind wave conditions as a wave dissipator and reflector. The reflection, transmission, and energy dissipation of the random waves has been discussed in detail based on a newly proposed relation between wave steepness and a plate width normalized by wave length that are major factors affecting the wave transmission.
Characteristics of Run-up Height over Sandy Beach with Submerged Breakwaters ; PART II - Effect of Shape of Submerged Breakwaters
Hur, Dong-Soo ; Lee, Woo-Dong ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 429~439
The purpose of this study is to examine the characteristics of run-up height over sandy beach due to the shape of submerged breakwater. For the discussion on it in detail, 3-Dimensional numerical model with Large Eddy Simulation, which is able to simulate directly interaction of Wave Structure Sandy beach (hereafter, LES-WASS-3D; Hur and Lee, 2007) has been used to simulate run-up height over sandy beach as well as wave field around submerged breakwaters. Using the results obtained from numerical simulation, the effects of the shape of submerged breakwaters (crown height, crown width, crown length and submerged breakwater's slope gradient) on run-up height over sandy beach have been discussed related to the wave height distribution and characteristics of up-layer flow around ones.
Applications of a Hybrid System Coupled with Ultraviolet and Biofiltration for the Treatment of VOCs
Shin, Shoung Kyu ; Song, Ji Hyeon ;
Journal of The Korean Society of Civil Engineers, volume 28, issue 4B, 2008, Pages 441~447
Volatile organic compounds (VOCs) emitted from various industrial sources commonly consist of biodegradable chemicals and recalcitrant compounds. Therefore, it is not effective to employ a single method to treat such mixtures. In this study, a novel hybrid system coupled with a ultraviolet (UV) photolysis reactor and a biofilter in a series was developed and evaluated using toluene and TCE as model VOCs. When only TCE was applied to the UV reactor, greater than 99% of TCE was degraded and the concentration of soluble byproducts from photo-oxidation reaction increased significantly. However, the toluene and TCE mixture was not effectively degraded by the UV photo-oxidation standalone process. The hybrid system showed high toluene removal efficiencies, and TCE degradation at a low toluene/TCE ratio was improved by UV pretreatment. These findings indicated that the UV photo-oxidation were effective for TCE degradation when the concentration of toluene in the mixture was relatively low. A restively high toluene content in the mixture resulted in an inhibition of TCE degradation. Thus, chemical interactions in both photo-oxidation and biodegradation need to be carefully considered to enhance overall performance of the hybrid system.