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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 24, Issue 6D - Nov 2004
Volume 24, Issue 6C - Nov 2004
Volume 24, Issue 6B - Nov 2004
Volume 24, Issue 6A - Nov 2004
Volume 24, Issue 5D - Sep 2004
Volume 24, Issue 5C - Sep 2004
Volume 24, Issue 5B - Sep 2004
Volume 24, Issue 5A - Sep 2004
Volume 24, Issue 4D - Jul 2004
Volume 24, Issue 4C - Jul 2004
Volume 24, Issue 4B - Jul 2004
Volume 24, Issue 4A - Jul 2004
Volume 24, Issue 3D - May 2004
Volume 24, Issue 3C - May 2004
Volume 24, Issue 3B - May 2004
Volume 24, Issue 3A - May 2004
Volume 24, Issue 2D - Mar 2004
Volume 24, Issue 2C - Mar 2004
Volume 24, Issue 2B - Mar 2004
Volume 24, Issue 2A - Mar 2004
Volume 24, Issue 1D - Jan 2004
Volume 24, Issue 1C - Jan 2004
Volume 24, Issue 1B - Jan 2004
Volume 24, Issue 1A - Jan 2004
Selecting the target year
Rating Estimation of Experimental Catchment for Urban Hydrologic Monitoring
Seo, Kyu-Woo ; Kim, Ga-Ya ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 1~7
The object of this study is to collect the hydrologic data in the urban catchment, and to estimate the rating between water level and discharge for the Dong-Eui university experiment catchment. The experiment catchment in Dong-Eui university was selected as the testing catchment and the hydrologic data has been collected using the state-of-the-art monitoring devices, such as Automatic Water level Station (AWS), and Environment Monitoring Station (EMS), for 4 years. The AWS was installed at the runoff gauging point and the EMS was installed within the experiment catchment, respectively. To estimate the rating between water level and discharge for this experiment catchment, which is used to calculate the discharge, the collected data was analyzed using the regression analysis. And the first year (2000), rating was finally selected by
(Q:cms, h:m). Also, the second you (2002), rating was finally selected by
(Q:cms, h:m) for getting more faithful equation of the rating between water level and discharge. Finally, if the hydrologic data from this urban runoff experiment catchment is collected continuously, it will be useful to understand the characteristics of the urban runoff. Also, the collected discharge data can be useful during the calibration and the verification procedures when estimating the parameters of the urban runoff model.
Optimal Operation Rules for Multireservoir Systems Using Genetic Algorithm
Lee, Kil-Seong ; Chung, Eun-Sung ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 9~17
The coordinated operation of multireservoir systems is typically a complex decision-making process involving many variables, many objectives, and considerable risk and uncertainty. Multireservoir system operation has been studied often with the aid of various optimizations as well as simulation methods and it is clearly known that the use of optimization models in the operation of reservoirs can be quite beneficial. Multireservoir operating rules are usually defined by niles that specify either individual reservoir target storage volumes or target releases based on the time of year and the existing total storage volume in all reservoirs. In this study, genetic algorithm(GA), one of the optimization method, is used to find monthly optimal operating rules of the Nakdong gang system in dry season. The objective function consists of maximizing the power generation and minimizing the deficit of essential discharge at the control point of channel. The real-value representation, elitism, uniform crossover, and dynamic mutation are used in the algorithms. The operating rules generated from 1990 to 1998 are compared with the previous study, using deterministic dynamic programming(DDP). Conforming the effectiveness of GA, the optimal operation rules are derived by using the multiple regression analysis. These results are applied to the simulation for the arbitrary scenario. The optimal operations from GA model are more effective than those from DDP and the results of simulation also show 1.0 GWh more in power generation.
Equation of Critical Depth of Open Channel flow
Yoo, Dong-Hoon ; Rho, Jung-Soo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 19~23
Critical depth is defined as the depth when Froude number is 1 and specific energy is minimum. The determination of critical depth is very important in the computation of open channel flow because it determines the direction of flow influence and the method of analysis. Critical depth can be directly computed for triangular or rectangular channel by using the traditional method, but for trapezoidal or semi-circular channel the solution has to be obtained by using the method of trial and error. Even though it can be solved, the process is very complex and needs long iteration. In the present study, proposed are several nondimensional numbers related with the critical depth, and after obtaining the solutions of the equation by transforming autonomous variables
to subordination variables, developed are the explicit equations; second order polynomial and third order polynomial for circular channel, and third order polynomial expression and power law for trapezoidal channel by checking the distribution tendency of the solutions. The explicit equations have the error
in a normal condition, and hence it is reliable in their accuracy. It has an error over 10% in a specific region, but it provides good efficiency because the solution of the explicit equation can reduce the iteration process of computation.
Estimation of Roughness Coefficients in Downstream Part of the Han River Using a Hydraulic Flood Routing Model
Lee, Jong-Kyu ; Lee, Chang-Hyun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 25~32
The stage and discharge are calculated by adapting cross-section, Manning roughness coefficients n and up and downstream boundary conditions to input data. The cross-section can be obtained definitely by field surveying; the roughness coefficients, however, cannot be obtained directly because they are empirical values. Roughness coefficients, therefore, are obtained by presumption according to river characteristics or by using an observed data. The purpose of this study is to determine more accurate roughness coefficients by using the modified Newton-Raphson method in the FLDWAV model, which reduces the required computing time. The equations are formula is proposed to estimate roughness coefficients for the Han River (Paldang dam-Jeonryu) by representing an exponential function of discharges.
Estimation of Orographic Effect on Precipitation in the Han River Basin - I. Regression Analysis -
Yoo, Chul-Sang ; Jun, Kyung-Soo ; Kim, Kee-Wook ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 33~39
Linear and non-linear regression analysis of the point precipitation (annual, monthly, dry and wet season) with respect to their elevation have been tried to search a proof of orographic effect in the Han river basin. Especially the linear regression analysis was focused on the test of significance for the slope, and the non-linear regression on the search for precipitation increase in a special elevation. To make sure of the presence of orographic effect, several precipitation events with their direction from West to East have been selected and applied to the same regression analysis. As results of the study we could found: (1) No significant linearity is not found between the precipitation amount and elevation. (2) Rather obvious increase of the precipitation amount can be found around the elevation of 600 m. (3) precipitation amount variation with respect to the elevation varies depending on the precipitation events considered. Thus the information of elevation may be limited to explain the orographic effect.
Estimation of Orographic Effect on Precipitation in the Han River Basin - II. EOF Analysis -
Yoo, Chul-Sang ; Jun, Kyung-Soo ; Kim, Kee-Wook ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 41~46
Empirical orthogonal functions (EOFs) of several rainfall events, which are believed to have the orographic effect, are derived and analyzed for the Han river basin. Also, it could be possible to conjecture the quantity of orographic effect on the rainfall variation by comparing the EOFs derived and topography of the basin. Finally, the Coefficient Times Series of the EOF highly correlate with the topography were compared with the rainfall amounts at different elevation, which were to derive how the EOF affects on the rainfall patterns in both plain and mountain regions. The results derived can be summarized as follows. (1) Most of the rainfall events have at least one distinct EOF which is highly correlated with the topography of the given basin. (2) The Coefficient Time Series of the EOF highly correlated with the topography and the rainfall in the mountain region are found very highly correlated. Also the effect of the EOF on the total rainfall variability was estimated to be maximum 30%.
The Study on Real-Time Neural Network forecasting Model of Flood Runoff Using Dam Discharge in Han River
Yoon, Kang-Hoon ; Seo, Bong-Chul ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 47~53
Modeling rainfall-runoff at the watershed is important for water resources management and design of flood control structures. The response of a watershed to rainfall is complicated by geomorphologic properties and various hydrologic components. In Korea, flood discharge is controlled and stored by dam operation in most rivers, therefore river stage depends on dam discharge. In this study, neural network model which was linked with dam operation was applied to real-time river stage prediction in order to examine applicability for flood warning and forecasting. Developed model using neural network, NRDFM(Neural River Discharge-Stage Forecasting Model) is applied to predict flood discharge on Yeuju and Hanganggyo station in Han river. As a result of NRDFM prediction considering the discharge of chungju dam and paldang dam which locate in upper stream from those stations, it is found that NRDFM shows excellent forecasting results in three hours and long time prediction using NRDFM is available.
The Analysis of Correlation Between GIUH Parameters and DEM Based Parameters
Shin, Hyun-Suk ; Kim, Hong-Tae ; Park, Mu-Jong ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 55~62
This study is to analyse correlation between Geomorphologic Instantaneous Unit Hydrograph (GIUH) parameters and Digital Elevation Model (DEM) based parameters. They are based on the various GIUH parameters that were analysed with Geographic Information System (GIS) and Horton's rule at large and small basins. The first , based on the calculated basin data, we made the regression equation GIUH parameters to basin area and GIUH parameters to flow length. For verification of the equation, Jangsudae Basin is used and calculated GIUH parameters, basin area and flow length. The second, GIUH parameters which was calculated using basin area are each
is 4.512, 3.803, 2.138. It is similar with observed data in Jangsudae Basin, each
is 4.4841, 3.8347, 1.5744. In table 7, we knew that peak runoff (
) and peak runoff time (
) are very similar between the observed data and the calculated data. In the result of this study, we found that the calculation of GIUH parameters are very easy only basin area or flow length and the regression equation and without GIS work.
A Numerical Simulation for Initial Dispersion of Dredged Material
Kang, See-Whan ; Kim, Sang-Ik ; Kang, In-Nam ; Jung, Tae-Sung ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 63~68
The initial dispersion of sediment plumes resuspended due to grab dredging has been investigated by using D-CORMIX model and field measurements. The sediment plumes at Gunsan Port dredging site were surveyed and the resuspended sediment characteristics were also analyzed. Using the field surveyed input data, the model was simulated to predict the initial dispersion of sediment plumes in the near-field of the dredging site. The predicted results were compared with the measured concentrations of sediment plumes at two different locations, i.e. at 20m and 150m downstream distances from the dredging site. The results shows a good agreement with the shape of sediment plumes and suspended concentrations in the near-field of dredging site.
Physicochemical Charateristics and Settlement Evaluation of he Landfill with Landfill Gas (LFG) Collecting Facilities
Kwon, Oh-Jung ; Seo, Min-Woo ; Hong, Soo-Jung ; Park, Jun-Boum ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 69~78
The utilization of landfill gas (LFG) collected from landfills located in the vicinity of municipal areas becoms a growing concern. This study evaluated physicochemical characteristics and settlements of the landfill where the facilities for collecting LFG are installed. The facilities to reuse the landfill gas (LFG) as a energy resource was built in the Kyungnamn S landfill site, whereas the precise estimation of settlements was not performed on design. Therefore, evaluating the safety of facilities against the settlements was also required. In this study; (1) the physicochemical properties of the waste samples of the Kyungnam S landfill site were evaluated, (2) the settlement was calculated by adapting the published methods for the prediction of landfill settlements, and (3) the safety of facilities for collecting LFG against the differential settlements was investigated based on the results of settlement estimation.
HRT-Based Design Procedures For Activated Sludge Process
Lee, Jeoung-Su ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 79~85
The activated sludge process was developed early in the 1900's, and when change come to the activated sludge process, it did not come from the design engineer or the research laboratory but from the operator, and thereafter, solving special problems such as bulking and development of new processes were due to the ingenuity of the operators (McKinney, 1962). Therefore, many parts, including design conditions (see Table 1) and
plans of bulking, known till now depended to a great extent on their empirical knowledge, and there was no theoretic bases to give a consistent explanation why applicable F/M ratio, mixed liquor suspended solid (MLSS), and HRT etc are different respectively in the processes of Table 1. Furthermore, Table 1 restrict the design range of HRT, F/M ratio and MLSS ect, therefore it hindered rather than helped free designs. In this connection, Lee (2000a) clarified the correlation between these design factors. On the basis of Lee's theory, this study is intended to show new HRT-based design procedures which can make a design possible, without relation to existing design conditions. This design procedures can maintain sludge settle ability even in any design condition, and is very simple and clear in design process in comparison with existing design procedures.
A Study on Iron Removal Mechanism using an Aerated Granular filter
Cho, Bong-Yeon ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 1B, 2004, Pages 87~93
Laboratory scale experiments concerning iron removal from the artificial raw water by a filter using anthracite as filter media were conducted. The experiments for Iron removal using an aerated granular filter were conducted at a filtration rate of 100 m/d. Anthracite with geometrical mean particle size of 3.68 mm and 5.21 mm was used as the filter media. Air, of which the rate is
, was supplied through nozzles positioned 100 mm above the filter column bottom. Major finding were that iron oxidation and removal by an aerated filter was mainly by catalytic chemical reaction. Further, iron removal did not perform effectively without aeration. Iron removal was very effective when the pH was weak-acidity. Iron oxide attached to the surface of the media was Ferrihydrite(
) which catalyze oxidation of iron.