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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 16, Issue 3_6 - Nov 1996
Volume 16, Issue 2_6 - Nov 1996
Volume 16, Issue 1_6 - Nov 1996
Volume 16, Issue 3_5 - Sep 1996
Volume 16, Issue 2_5 - Sep 1996
Volume 16, Issue 1_5 - Sep 1996
Volume 16, Issue 3_4 - Jul 1996
Volume 16, Issue 2_4 - Jul 1996
Volume 16, Issue 1_4 - Jul 1996
Volume 16, Issue 3_3 - May 1996
Volume 16, Issue 2_3 - May 1996
Volume 16, Issue 1_3 - May 1996
Volume 16, Issue 3_2 - Mar 1996
Volume 16, Issue 2_2 - Mar 1996
Volume 16, Issue 1_2 - Mar 1996
Volume 16, Issue 3_1 - Jan 1996
Volume 16, Issue 2_1 - Jan 1996
Volume 16, Issue 1_1 - Jan 1996
Selecting the target year
Development of a State-Space Form of Stochastic Muskingum-Cunge Model for a Natural Channel
Cho, Won-Cheol ; Bae, Deg-Hyo ; Lee, Jong-Seol ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 533~533
The objectives of this research are to extend a state-space form of stochastic dynamic Muskingum-Cunge model that can be applicable on natural channels and to test the model performance depending on different options. The study area is the main Han River starting from Paldang Dam site to Indogyo station and the main flood events during 1987 to 1994 are selected. It was shown that under the deterministic option without considering lateral inflows the model efficiency is above 0.95 for an event with relatively small uncertainty, but about 0.86 for a large one. In this situation, the model performance under the stochastic option with high model uncertainty can be improved dramatically. It is concluded that the stochastic model that can be considering various situations during a flood event is useful and produces reliable predicted flows.
Analysis of Low Flow for Hydrologic Design of Dam Reservoirs
Kang, Kyung-Seok ; Seoh, Byung-Ha ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 543~543
This study is focused on investigating and improving the present-used method on determination of reservoir yield. The method based on the probabilistic analysis is suggested to determine the active storage capacity of an impounding reservoir under the considerations of the durations and return periods of low flow series at the proposed Youngdam dam site. The partial series of the lowest flows was constructed, whose drought durations are 5, 7, 10, 20, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 360 days. using the flow records from 1963 to 1992 at the Youngdam stage gauging station. The occurrence frequencies of the lowest flow series are statistically analyzed. The various types of probability distribution have been tested to determine reliable distribution fitted to the data series, with the results that the two-parameter Weibull distribution is most adoptable for the data series. The two-parameter Weibull distribution is selected as a representative probability distribution and used to develop duration-frequency-discharge relationships for each duration series at Yongdam station. The mass analytical method applied to establish the storage-draft-recurrence interval relationship for determining an optimum storage capacity of reservoir has obtained better results than those by the Rippl's method. The storage-draft-recurrence interval relationship established by the mass analytical method has been presented to determining the storage capacity of the proposed Youngdam dam.
Numerical Analysis of Two-Dimensional Horizontal Flow by Finite Volume Method (I) - Development of a Numerical Model -
Yoon, Tae-Hoon ; Kim, Chang-Wan ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 555~555
This paper presents a two-dimensional stream flow model based on the finite volume method. The feature of the model is that it calculates the mass and momentum flux across each side of control volume as a power-law scheme, which is very similar to the exact solution of one-dimensional steady state flow equation in which only the advection and diffusion terms are present. The power-law scheme is useful because its computing time is shorter than that of exact solution. Depth correction and velocity correction procedures like SIMPLER algorithms were introduced to deal with the velocity-depth coupling. The staggered grid system was used in the model. To accelerate the convergence of depth-correction, the second depth-correction equation was introduced only for the depth-correction.
Numerical Analysis of Two-Dimensional Horizontal Flow by Finite Volume Method (II) - Application of the Numerical Model -
Yoon, Tae-Hoon ; Kim, Chang-Wan ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 567~567
The purpose of this paper is to apply the developed horizontal two-dimensional flow model by finite volume method for verification. The main feature of this model is that it calculates the mass and momentum flux across each side of the control volume as a power-law scheme. The model was tested for four cases and they are jet in a crossflow, flow in a channel with a dead zone, flow in a sudden contraction-expansion channel and resonant motions in a pool or channel. It was founded that these test examples proved that the model is able to simulate the flows adequately. Simulation of the resonant motions in a pool or channel was included to test the limitations of the numerical model. It was shown that the model provides physically acceptable results about flows influenced by both advection and diffusion if the coarse grid system is used.
Wind Effects on Water Circulation of Masan-Jinhae Bay
Jung, Tae-Sung ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 577~577
Coastal circulation of Masan-Jinhae Bay under the combined action of wind and tide was investigated by applying a three-dimensional numerical model. To prove the accuracy of the model, a series of numerical experiments were conducted. The model was verified by the experimental data of open-channel flow under wind action and the field data of wind-driven currents of Masan-Jinhae Bay showing good agreements. For seasonally representative wind conditions in winter and summer, wind effects on coastal circulation were investigated. The simulated results have shown that northerly wind produces the surface currents from Masan Bay to outer sea and the return currents to Masan Bay at bottom layer while southerly wind moves surface sea water to Masan Bay.
Comparison of Numerical Models to Predict Irregular Wave Transformations
Jeong, Shin-Taek ; Lee, Chang-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 589~589
The combined refraction-diffraction of water waves on a slowly varying topography was first studied by Berkhoff (1972), who derived the elliptic mild-slope equation. Since then, great advances have been made in modeling water-wave propagations using various types of the equation. Radder and Dingemans (1985) derived time-dependent forms of the mild-slope wave equation, which was derived based on the Hamiltonian theory of water waves. Recently, Vincent and Briggs (1989) conducted hydraulic model experiments for the transformation of monochromatic and directionally spread irregular waves passing over a submerged elliptical mound. They found that for the case of combined refraction-diffraction of waves by a shoal, the characteristics of irregular waves are different from those of equivalent regular waves. In the present paper, three kinds of wave equations including time-dependent mild-slope equations are used in order to numerically simulate the hydraulic model results of Vincent and Briggs (1989). The comparison between the experimental and computational results shows that the numerical models can simulate reasonably well the transformation of directional irregular waves.
Nonlinear Interaction of Waves and the Submerged Breakwater by Weakly Nonlinear Model
Yun, Duk-Yong ; Hur, Dong-Soo ; Kim, Do-Sam ; Kang, Ju-Bok ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 597~597
Generally, in case that the trapezoidal submerged breakwater with one row is constructed for the purpose of controlling incident waves, the construction expenses is relatively incremented in need of the wide crown width and shallow submerged water depth. This study picks up the trapezoidal submerged breakwater with two rows which has the same or smaller construction materials comparing to the one row. Judging from the results of the linear analysis, the trapezoidal submerged breakwater with two rows can effectively regulate incident waves, especially long waves which are difficult to control. And although resonant reflection which is known as Bragg reflection occurs on the trapezoidal submerged breakwater with two rows. the condition is different from the case of sinusoidally varying sand bar. This paper discusses mainly the characteristics and transformation of the nonlinear waves due to the trapezoidal submerged breakwater with one and two rows. Theory is based on the frequency-domain method using the second order perturbation and boundary integral method. Resorting to the nonlinear wave transformation which is composed of free, bounded and steady wave components, trapezoidal submerged breakwater with two rows gives more tranquil waters than with one row. Therefore, by constructing its intervals appropriately the trapezoidal submerged breakwater with two rows which has the same or smaller construction materials comparing to the one row can control incident waves efficiently.
Tide/Tidal Currents Changes by Construction of Seadike/Seawalls near the Coastal Zone of Mokpo
Kang, Ju-Whan ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 611~611
It is verified by numerical analysis adopting fully implicit scheme that 'tidal filter effect' does not function any more in accordance with construction of seadike/seawalls near the coastal zone of Mokpo. It induces amplification of tidal range: extreme high tide and low tide rise up 60 cm and draw down 43 cm, respectively analyzing tidal record, which alarms us to prevent with serious innundation followed by hurricanes especially. Another problem is reduction of tidal velocity which may deteriorate coastal environment. These environmental changes are detected not only Youngam Bay but
outer region of Mokpogu.
The Phenomenological Study of the Topographic Change in Song-jong Beach
Choi, Seon-Ho ; Park, Sang-Kil ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 621~621
In this study, the periodical leveling and grain size analysis have been done in Song-Jong beach. And they are analyzed phenomenologically that the volumes and direction of littoral transports, the variation of erosions, accretion volume and areas in both back-shore and foreshore. The numerical geographic model and change detection technique were used as an analysis methods. And the causes of the topographic change and the seasonal variation on beach were analyzed. As a result, it has been known that the variation of beach has been closely related to the paths of typhoons. The effective method of managements is suggested with estimating the stability of beach in accordance with the results.
A Experimental Study of Fluoridation in Water Supply
Lee, Yang-Kyoo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 631~631
The most effective method to prevent tooth decay is putting lower concentrated fluoride (1.0 ppm) into drinking water. However, exact fluoride injection amount have been decided, because the research of the fluoride injection effect was insufficient. Therefore, after injecting two other fluoride amount
into public water supplies every five minutes, we measured comparing the results of two concentration experimentations. Then, we decided allowable concentration of fluoride by measuring the concentration in the food using the above public water.
A Study on the Model for the Fate of Organic Priority Pollutants in Wastewater Treatment Facilities: Formulation of a Fugacity Model and Simulation
Choung, Youn-Kyoo ; Ko, Kwang-Baik ; Yim, Seong-Keun ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 639~639
Removal of organic compounds in wastewater treatment facilities is involved in a combination of the complex processes such as volatilization/stripping, adsorption and biodegradation, which may depend on the physicochemical properties of the compounds and the operational conditions of the plants. Reasonable prediction of the fate of an organic chemical is essential for the future development of an effective removal process. An equilibrium model and a nonequilibrium model, based on the fugacity concept, were formulated and tested to delineate the major removal mechanisms, efficiencies and the overall fate of some priority pollutants entering a treatment plant. The results show that the proposed models can predict effluent concentrations within a reasonable range, comparing them with those from other existing models. The models also overcome the problems related with overestimation of biodegradation and underestimation of adsorption in an existing fugacity model. TORONTO. The nonequilibrium model can provide estimation of the rates of chemical transfer between media such as water, suspended solids and air, and can figure out the behavior of organic compounds in each unit process. It is noted that the models appear to be relatively simple and ease to use in predicting the fate of organic priority pollutants in wastewater treatment plants.
Model and Operation of the Solid-liquid Separation by the Inclined Plates
Chun, Yang-Kun ; Choi, Yong-Su ; Choung, Youn-Kyoo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_6, 1996, Pages 653~653
The successful operation of the wastewater treatment process is greatly dependent on final clarifier performance. This paper surveys the possibility of inclined plates to enhance solid-liquid separation efficiency. In the first part of this paper, the three-layer model is generalized to evaluate the performance of both the top-feeding and bottom-feeding modes. The operating efficiencies of the subcritical and supercritical modes are measured and compared as a function of inclined angle and sludge concentration. For top-feeding subcritical mode in which the feed layer expands down the channel and a supercritical mode in which it contracts are confirmed. For a given reactor angle and sludge concentration. the efficiency of the supercritical mode is always higher than that of the subcritical mode. In bottom-feeding. detailed analysis shows that the supercritical solution does not exist for x
when it was top-feeding or bottom-feeding. It was acceptible that the ratio inflowrate to theoretical flowrate was 35% for absorbance of effluent.