Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
Editor in Chief :
Volume & Issues
Volume 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
Selecting the target year
A Study on the Controlling Effect of Sediment Motion by the Groin
Cho, Hong-Je ; Lim, Min-Soo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 531~531
The Purpose of present study is to simulate river profile changes by the groin which was constructed at 2.5km up from the downstream of Taehwa river, and compare the sediment movements changed by the presence of the groin and the amounts of the river runoff by using the computer Program HEC-6. As sediment discharge formulae, the Ackers & White and Yang formula were used. The latter, as a whole, produced larger sediment discharge than the former. For the simulation of sediment movement and river profile changes, three types of flows, that is, normal, flood flow, and longterm flow were considered It revealed the controlling effect of sediment motion by the groin was observed in normal flow, but not in flood flow In case of longterm flow, weak controlling effect was shown.
The Sensitivity Analysis of Urban Runoff Model Parameters due to Variation of Rainfall Duration
Seo, Kyu-Woo ; Kim, Mun-Mo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 543~543
In this study, in order to analyze the parameter sensitivities of CHICAGO hydrograph method, ILLUDAS SWMM, total runoff ratio, peak runoff ratio, runoff sensitivity ratio, sensitivity ratio of total runoff, and sensitivity ratio of peak runoff were defined. And these ratios were estimated based on the scale of basin area, rainfall distributions and rainfall durations. Total runoff ratio for almost Parameters turned out to have a linear relation to the rainfall durations and the scale of basin area but have nothing to do with rainfall distributions. While the peak runoff ratio for the parameter of CHICAGO hydrograph method turned out not to have a trend for the scale of basin area. rainfall duration and rainfall distributions, it turned out to have a linear relation for the infiltration and soil parameters of ILLUDAS as well as all parameters of SWMM.
Effects of Nonuniformity of Pier Dimensions on Bridge Pier Scour
Yoon, Tae-Hoon ; NamGung, Don ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 553~553
The effects of nonuniformity of the cross section of bridge substructures composed of a pier and a footing on bridge scour depth were analysed by experiments. The conversion of dimensions of a nonuniform pier to an uniform one of a single representative size is needed in order that the scour depth equations derived for uniform Piers can be applicable to nonuniform Piers. For this Purpose five different conversion methods were investigated with the experimental data using seven scour depth equations. Of the conversion methods, the equivalent pier width determined as a weighted average of pier and footing with the associated weighting factors being the heights of them are found more adequate than others. The height of footing and the width ratio of pier and footing are revealed to be governing factors on scour depth due to nonuniform piers.
Predicting a Daily Streamflow Using DVS Algorithm
Kim, Hung-Soo ; Choi, Si-Jung ; Kim, Joong-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 563~563
Hydrologic time series has been analyzed and forecasted by using classical linear models. However, there is growing evidence of nonlinear structure in natural phenomena and hydrologic time series associated with their patterns and fluctuations. Therefore, the classical linear techniques for time series analysis and forecasting may not be appropriate for nonlinear processes. A daily streamflow at St. Johns river near Cocoa. Florida, USA shows an interesting result of a low dimensional, nonlinear dynamical system. Based on the chaotic dynamical characteristic, DVS algorithm is used for short-term forecasting, as well as for exploring the properties of the system.
Hurst Phenomenon in Hydrologic Time Series
Kim, Hung-Soo ; Park, Jin-Uk ; Kim, Joong-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 571~571
Hurst phenomenon is one of the unsolved Problems in stochastic hydrology, or natural science. However, more studies may be needed on Horst Phenomenon for better modeling and forecasting of hydrologic or other systems based on Hurst effect. A key feature of the Horst phenomena is explained with long term Persistence and it has been studied by Markovian processes, Brownian domain, and the estimation of Hurst exponent. There are many techniques such as variance-time plot, Pox diagram, and GEOS diagram to see Horst effect in time series. This study uses those techniques to test Hurst effect in hydrologic data and chaotic time series from dynamical systems and a map. As a result, a chaotic dynamical system and chaotic hydrologic data which show strong autocorrelation are in Horst domain.
Reconstruction of River Flows Using Tree-Ring Series and Neural Network
Kim, Hung-Soo ; Hwang, Seok-Hwan ; Kim, Joong-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 583~583
In this study stochastic and neural network techniques for the reconstruction of annual flow data from tree-ring series are Presented. The reconstructed annual flow could be used for a drought analysis that requires long term data series. However, the statistical Properties of the reconstructed annual flow must be preserved with those of the historical data. Annual flow data are reconstructed from tree-ring series of 387 years(1485-1871) of Oregon and California, USA using a stochastic technique and neural network and this study compares the statistics of the reconstructed annual flow data from tree-ring series by a stochastic analog and a neural network implementation with the historical record It is observed that the reconstructed annual flows data using the tree-ring series published in Earle and Fritts(1986) and Shen and Tabios III(1995) have less variability compared to the historical record(1872-1992).
A 3-D Random Breaking Model for Directional Spectral Waves
Kweon, Hyuck-Min ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 591~591
A 3-D Random Breaking Model for Directional Spectral Waves. A new directional wave deformation model due to random wave breaking is developed. The model combines the Kweon and Goda's breaking model (1996) for uni-directional wave and the Karlsson's energy balance equation (1969) with its numerical scheme for directional waves. The basic concept of the Kweon and Goda'a model is to let the wave decay factor
vary gradually over a certain distance in order to take into account the random wave breaking process. This concept of gradually varying decay factor is employed as the key Parameter of the new model. However, the spreading of breaking and broken waves in a 3-D system of x, y, a is dealt with modification of the wave decay factor after breaking The modification process is calibrated by comparison with two existing models for uni-directional wave breaking. Verifications were made with two sets of experimental data involving 3-D wave breaking phenomena which were investigated by two laboratories, The model is found to be capable of predicting reasonably well the variations of significant wave heights over shoals measured at two laboratories. With an easiness in computation, the present model is promised to be a practitioner's tool in analyzing spectral wave deformation with breaking.
Boundary Treatment in a Hyperbolic Wave Model
Lee, Jung-Lyul ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 601~601
This study provides an effective scheme to handle boundary conditions on the implicit hyperbolic model Proposed by Madsen and Larsen (1987). A one-dimensional analysis shows that the present scheme appears to be superior to that of sponge-type for the wave transmission and Partial reflection. Where the boundary treatment of partial reflection is accomplished by separating waves into Progressive and reflective components. Through the comparison with Isobe's hydraulic experiments(1986), the two-dimensional model is verified.
Changes of Pollutant Dispersion Mechanism by Constructions of the Seawalls near the Mokpo Coastal Zone
Kang, Ju-Whan ; Ihm, Byoung-Sun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 613~613
The RMA model is applied to the Mokpo coastal zone to analyze the changes of pollutant dispersion mechanism by constructions of the Seawalls, and the SMS model is adopted for pre/Post processing. Fixing Peclet number enables eddy viscosity coefficient varies automatically according to tidal velocity Ebb dominance phenomenon is also reflected to the boundary conditions which have been computed by the global model. Results of the RMA2 model show little differences from by other studies and observed data, and they are used for the input data of the RMA4 model. A boundary condition for RMA4 model is given as unit concentration released at Mokpo harbor and longitudinal dispersion coefficient is determined by comparing indices such as water depth and width of the Mokpo coastal zone and the Horsey estuary. Releases of both temporal conservative Pollutant and continuous non-conservative Pollutant are simulated, which lead almost same conclusions as follows. Most region of the Mokpo coastal zone suffers deepened contamination of 50% more than before the constructions and the 4th Seawall region will do 30% more in case of constructing the 4th Seawall.
Characteristics of Random Breaking Wave Propergating over Arbitrary Profiles
Kweon, Hyuck-Min ; Lee, Dal-Soo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 623~623
The random wave breaking is one of the most important phenomena in coastal engineering because it acts on coastal structures and sediment transport as a primary impact load However because of its strong nonlinearity and irregularity it is very hard to understand the mechanism. For this reason the study about random wave breaking mainly has been relied on experiments. In this study, an experiment has been conducted with two arbitrary profiles -a step and a bar- for the investigation of wave characteristics due to random wave breaking. The results studied using the wave by wave analyzing method show 1) wave height distribution inside breaking zone deviates a lot from the Rayleigh distribution 2) however, it returns to the Rayleigh distribution after a stable wave is restored 3) the ratios among stable wave heights for each representative wave are almost the same as those calculated based on the Rayleigh distribution.
Experimental Verification of Brownian Coagulation Zone Diagram in
Lee, Hyung-Ki ; Han, Moo-Young ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 2_6, 1998, Pages 639~639
Han et at. (1997) have suggested a Brownian Coagulation Zone Diagram which divides the coagulation and non coagulation zone in a graphical plane of
. In this research, a set of experiment has been performed in a well controlled laboratory to verify the Brownian coagulation. In a non-coagulation zone, particle size distribution and total number concentration at both initial and final stage showed little variation. However, in a coagulation zone, particle size distribution moved toward a larger size which has a increased number concentration. The experimental result was overlapped on the theoretical
Diagram and discussed. In conclusion, the existence of the division was verified and also the critical condition of the division calculated from the theory was verified from the experiment. This Brownian Coagulation Zone Diagram can be applied to both natural and engineered system to understand the phenomenon or to suggest a scientific method in order to artificially maintain the status of suspension or switch to another status