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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 23, Issue 6D - Nov 2003
Volume 23, Issue 6C - Nov 2003
Volume 23, Issue 6B - Nov 2003
Volume 23, Issue 6A - Nov 2003
Volume 23, Issue 5D - Sep 2003
Volume 23, Issue 5C - Sep 2003
Volume 23, Issue 5B - Sep 2003
Volume 23, Issue 5A - Sep 2003
Volume 23, Issue 4D - Jul 2003
Volume 23, Issue 4C - Jul 2003
Volume 23, Issue 4B - Jul 2003
Volume 23, Issue 4A - Jul 2003
Volume 23, Issue 3D - May 2003
Volume 23, Issue 3C - May 2003
Volume 23, Issue 3B - May 2003
Volume 23, Issue 3A - May 2003
Volume 23, Issue 2D - Mar 2003
Volume 23, Issue 2C - Mar 2003
Volume 23, Issue 2B - Mar 2003
Volume 23, Issue 2A - Mar 2003
Volume 23, Issue 1D - Jan 2003
Volume 23, Issue 1C - Jan 2003
Volume 23, Issue 1B - Jan 2003
Volume 23, Issue 1A - Jan 2003
Selecting the target year
Estimation of Inundation Area and Calculation of the Temporary Restoration Expenses Using GIS
Kim, Chul ; Kim, Souk-Gyu ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 233~239
In recent years, the damage caused by flood has been gradually increased. The cause of the flood is unusual weather condition as well as topographical and geographical condition of our country. The method to delineate inundated area is developed to prepare 2for the floods and the method to calculate the temporary restoration expenses in case of flooding. After pre-processing the data using ArcView and HEC-GeoRAS, the inundated area by return period of flood is delineated applying HEC-RAS software The temporary restoration expenses of the inundated area is calculated by using inundated depth grid and landuse grid of the area. The calculated results are represented using GIS. The study area is the Munsan river basin and the results of the study were verified comparing the outcome to the existing one.
Comparison of Reaeration Equations by the Weir Types
Yu, Dae-Young ; Kim, Sung-Tae ; Woo, Hyo-Seop ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 241~250
A number of predictive equations for reaeration at four types of weirs (free-overfall weir, spillway weir, gated spillway weir, gated sill) are examined and compared using field and experimental data. From the comparison of prediction equations, it is found that Avery and Novak's (1978) equation for free-overfall weir is the best fit to the observed data. Tsivo-glou and Wallace's (1972) equation yields the best prediction for spillway weir, Rindels and Gulliver's (1991) equation and Markofsky and Kobus's (1978) equation show the best prediction for gated spillway weir, and gated sill, respectively. Considering the standard errors and the number of data used in the comparison, Avery and Novak's equation is concluded to be the most reliable. It is revealed that the effect of downstream depth on the reaeration at free-overfall weir is not significant. It is also found that since the hydraulic jump greatly affects the reaeration at spillway weir and gated sill, the results of predictive equations that do not properly consider the effect of hydraulic jump show large disagreement with the observed data.
Quantitative Sensitivity Analysis of the Parameters Concerned with Critical Rainfall Duration
Lee, Joo-Heon ; Hur, Joon ; Lee, Hee-Chul ; Lee, Eun-Tae ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 251~259
In this study, quantitative specific value about four hydrologic parameters such as return period, rainfall distribution, soil moisture condition and time of concentration which has influence upon the change of critical rainfall duration is determined. In order to analyze sensitivities of each parameter, sensitivity index of critical rainfall duration
, sensitivity index of peak flow
and sensitivity ratio
were defined as the new dimensionless value. Also, sensitivity index and sensitivity ratio of the each parameters were estimated and those estimated values were used as fundamental data to analyze sensitivity of each parameter to critical rainfall duration and peak discharge. And the relative sensitivity between the critical rainfall duration and peak flow about four hydrologic parameters can be determined.
Rainfall-Runoff Analysis using GIS Technique
Ahn, Sang-Jin ; Kim, Young-Ho ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 261~270
In this study, Bocheong stream basin in Geum river, one of the representative watersheds of IHP projects, is selected. Hydrologic topographical informations are calculated using WMS which is hydrologic analysis software coupled with GIS Method, and flood analysis is accomplished by HEC-1 included in WMS. To calculate the effective rainfall CN values of SCS are used. Clark, Snyder and SCS methods are selected respectively to derive unit hydrograph. This study shows the applicability of GIS techniques to runoff simulation in ungauged basin by comparing with actual measured flood hydrograph. As a results, SCS method is suitable to Bocheong stream basin. For the basin partitioning, the simulated peak discharge is gradually increasing as the partitioned sub-basin is getting smaller. Sensitivity analysis was also performed to some factors which can not be determined by using GIS techniques. The channel roughness coefficient and channel width were found as the non-sensitive parameters for runoff responses.
Characteristics of Merging Buoyant Jets Discharged from Uni-directional Diffuser
Lyu, Si-Wan ; Seo, Il-Won ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 271~279
Behavior of merging buoyant jets discharged from uni-directional diffuser has been examined. Some series of experiments have been performed to define the range of merging transition based on the variations of flow properties, such as spreading rate and half width ratio. An integral model, which describes the behavior of the buoyant jets as they merge into a plane flow, was developed. For merging buoyant jets, the spreading rates increase during the merging process. The half width ratio, therefore, varies during the merging process. The spreading rates and half width ratio were observed to vary from the axi-symmetric to plane values over the range of the merging parameter,
to 1.2. The proposed jet integral model can simulate properly the centerline dilutions and trajectories of the merging buoyant jets. This implies that the spreading rate and half width ratio determined in this study are quite appropriate to present the phenomena occurring in real situations. Comparison of model performances reveals that the proposed model presents the most accurate result for simulating the behaviors of merging buoyant jets.
Evaluation of LS Parameters in USLE using GIS
Son, Kwang-Ik ; Noh, Joon-Woo ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 281~287
Multiple-direction flow algorithm, expecting good topological description results for the mountainous basin, was adopted in developing a program estimating the geomorphological parameters (LS) of USLE. The estimated LS factors using multiple-direction flow algorithm were compared with the LS values, derived from conventional single-direction flow algorithm to evaluate the efficiency and applicability in describing the flow phenomena in real basin. The comparisons were performed with the six imaginary basins which can represent simplified real field. It was found that the both algorithms showed no big difference for even field, such as farm. But the multiple-direction flow algorithm shows much better results for the mountainous area. Therefore, it could be concluded that the results of this research could be applied in estimating the geomorphological parameters (LS) for mountainous area.
Simulation of Daily Streamflows Using SLURP Model
Kim, Byung-Sik ; Seoh, Byung-Ha ; Kim, Hung-Soo ; Kim, Nam-Won ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 289~303
This paper describes the applications of the SLURP and the TOPAZ models. The SLURP is a conceptual model which, although normally used in semi-distribution form, can be used as a fully-distributed hydrological model. The major advantage of a SLURP model is that it can consider the necessary physical conditions by its simple managements. The problem of lacks of input data and the complexity of computation which can occur in the full-distributed models could be avoided by using the SLURP model. The SLURP model can also simulate the behaviour of the basin at sites and various hydrologic variables. In practical applications, the users of both simple lumped and physically-based fully-distributed models also tend to use this semi-distributed model. In this study, the SLURP model is applied to the simulation of the daily streamflows in Youngdam dam site. The SCE-UA (Shuffled Complex Evolution-University of Arizona) algorithm as a model parameter estimator and FAO Penman-Monteith model and CRAE (Complemetary Relationship Areal Evaporation) method as the potential evapo-transpiration model are used. The observed and simulated daily streamflow hydrographs from the SLURP model were compared. It was shown that the SLURP model preserves the observed daily streamflow hydrographs very well. This evidence suggests that the SLLRP model might be appropriate for the simulation of daily streamflows.
Direct Numerical Simulation of Double Compound Open-Channel Flows
Joung, Young-Hoon ; Choi, Sung-Uk ; Choi, Jung-Il ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 305~314
This paper present a direct numerical simulation of double compound open-channel flows. For this, a DNS solver for three-dimensional, time-dependent, incompressible fluids is developed. The solver employs the fully implicit decoupling procedure proposed by Kim et at. (2002). The multigrid algorithm is used to accelerate the convergence in solving the Poisson equation. Using the simulated DNS data, the mechanism of generating secondary flows due to anisotropy of turbulence is analyzed, and the detailed information of the mean flow and turbulence characteristics is provided. The turbulence statistics are obtained by averaging the flow field over the enough period and over the length in the streamwise direction. The instantaneous vorticity distribution is also presented. It is found that strong secondary flows are generated at the junctions between part I and II of the main channel and between the main channel and the flood plain, and at the interface between the side wall and the free surface. It appears that the secondary flows in these regions significantly affect the distributions of the streamwise mean velocity, wall shear stresses, turbulence intensities, and the Reynolds stresses. The DNS data also reveal that vortex structures in these regions are related with generation strong secondary flows.
Routing Method for Parameter Determination for Transient Storage Zone Model
Cheong, Tae-Sung ; Seo, Il-Won ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 315~325
A routing method to determine values of four parameters of a transient storage zone model that represent solute transport in natural streams with transient storage zones is developed. A functional relationship between the transient storage zone model parameters and an analytic solution for the transient storage zone equation is constructed. The new method and several existing method are compared with independently observed values of the transient storage model from laboratory flume experiment. This result show that the parameters determined by the new method is in better agreement with observation than earlier methods. The transient storage zone model parameters of 58 mixing data sets obtained from 33 natural streams are determined. Time concentration curves from analytical solutions with parameters determined by the new method provide a good match to the observed concentration curves.
Fully Coupled Model for the Simulation of Bed Elevation Change using FDM
Choi, Sung-Uk ; Han, Seung-Kyu ; Oh, Dong-Won ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 327~337
This study presents a fully coupled model for the simultaneous simulation of stream flow and relevant morphological change and compares a fully coupled model with decoupled model. The model analysis provides the characteristics of the coupled system between the flow equations and the bed sediment conservation equation and the limitations of the decoupled model. Four point Preissmann scheme is used to discretize the equations, and the Fourier stability analysis is performed. For the investigation of a fully coupled model, the model is applied to three cases, namely, bed aggradation due to sediment overload, dam break wave propagation over erodible bed, and delta propagation due to time-dependent sediment over-supply and the numerical results are compared with that of decoupled model. The fully coupled model simulates all test examples successfully, whereas the decoupled model exhibits a limitation that a small time step should be used to ensure the computational stability.
Comparison of Time-Dependent Extended Mild-Slope Equations for Random Waves
Lee, Chang-Hoon ; Kim, Gun-Woo ; Suh, Kyung-Duck ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 339~346
Both analytically and numerically, we compare the time-dependent extended mild-slope equations for random waves developed by Suh et al. (1997) and Lee et al. (2001). The two models are compared in view of dispersion relation of random waves. From analysis of the dispersion relations, we suggest use of the peak and weight-averaged frequencies as carrier frequencies of Suh et al.'s and Lee et al.'s models, respectively, In view of shoaling of random waves, Lee et al's model reproduces the characteristics of random waves properly in
, while Suh et al.'s model reproduces partially. The diffraction coefficient of random waves is determined by the dispersion relation of each model.
A Study on the 3-Dimensional Mixing Behaviours of Nakdong River Plume
Lee, Jong-Sup ; Yoon, Eun-Chan ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 347~358
A behaviour of Nakdong river plume was analyzed using the CTD data in average discharge season, then the numerical simulations considering river discharge and tide were carried out with the three dimensional model POM. The model results on the salinity distributions in the surface layer show well the tide effect to the expansion of Nakdong river plume. Coastal upwelling phenomenon at the north edge of the Keoje island is well simulated, where the high salinity water rises during ebb tide.
Changes of the Sediment Properties in Small Agricultural Reservoirs before and after Rainy Season
Lee, Jae-Soo ; Kim, Young-Chul ; Hwang, Gil-Son ;
Journal of The Korean Society of Civil Engineers, volume 23, issue 4B, 2003, Pages 359~368
In this paper, rainy season effects on the sediments of two agricultural reservoirs were investigated. For the sediments sampled before and after rainy season, organic and nutrient contents, types of the phorphorus, SODs and nutrient release rates were compared. It was found that rainy season highly increased potential contents of the organics and phosphorus in the sediments, which was thought to be caused by the soil particle inputs that carried from the dry-crop land and rice paddy by an intensive and long-term rainfall runoff during rainy season. At the same time, rainy season changed types of the phosphorus in the sediments. Prior to the rainy season, residual-P was predominant while the distribution shifted to the NAI-P and Apatite-P as major components, which are associated with soil particles from the crop field during rainfall events. Nutrient release rates of the sediments undergoing the rainy season were very much slowed down. It can be concluded that the rainy season is not only a source of fresh and high strength sediments in terms of the organic and phosphorus, but also affects nutrient release rates by providing an internal mixing of the bottom water and a plenty of oxygen for the sediments.