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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 32, Issue 6D - Nov 2012
Volume 32, Issue 6C - Nov 2012
Volume 32, Issue 6B - Nov 2012
Volume 32, Issue 6A - Nov 2012
Volume 32, Issue 5D - Sep 2012
Volume 32, Issue 5C - Sep 2012
Volume 32, Issue 5B - Sep 2012
Volume 32, Issue 5A - Sep 2012
Volume 32, Issue 4D - Jul 2012
Volume 32, Issue 4C - Jul 2012
Volume 32, Issue 4B - Jul 2012
Volume 32, Issue 4A - Jul 2012
Volume 32, Issue 3D - Jun 2012
Volume 32, Issue 3C - Jun 2012
Volume 32, Issue 3B - Jun 2012
Volume 32, Issue 3A - Jun 2012
Volume 32, Issue 2D - Apr 2012
Volume 32, Issue 2C - Apr 2012
Volume 32, Issue 2B - Apr 2012
Volume 32, Issue 2A - Apr 2012
Volume 32, Issue 1D - Feb 2012
Volume 32, Issue 1C - Feb 2012
Volume 32, Issue 1B - Feb 2012
Volume 32, Issue 1A - Feb 2012
Selecting the target year
Determination of the Optimal Sediment Discharge Formula for Hyeongsan River Using GSTARS
Ahn, Jung Min ; Lyu, Siwan ; Lee, Nam Joo ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 1~7
Quasi-two dimensional numerical model (GSTARS) was applied to determine the optimal sediment discharge formula for simulating the sedimentologic characteristics of Hyeongsan river. The field measurements have been conducted to obtain the data, such as sediment discharge, bed material, and channel geometry, for model calibration and verification. The sediment discharge formulas, which have been generally used, have been assessed according to the average error, relative error, RMSE, RRMSE, discrepancy ratio and Nash-Sutcliffe efficiency coefficient for bed changes along the thalweg. From the results, Laursen formula(1958) shows the best performance to simulate the long-term bed change of Hyeongsan river.
Comparison of Different Multiple Linear Regression Models for Real-time Flood Stage Forecasting
Choi, Seung Yong ; Han, Kun Yeun ; Kim, Byung Hyun ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 9~20
Recently to overcome limitations of conceptual, hydrological and physics based models for flood stage forecasting, multiple linear regression model as one of data-driven models have been widely adopted for forecasting flood streamflow(stage). The objectives of this study are to compare performance of different multiple linear regression models according to regression coefficient estimation methods and determine most effective multiple linear regression flood stage forecasting models. To do this, the time scale was determined through the autocorrelation analysis of input data and different flood stage forecasting models developed using regression coefficient estimation methods such as LS(least square), WLS(weighted least square), SPW(stepwise) was applied to flood events in Jungrang stream. To evaluate performance of established models, fours statistical indices were used, namely; Root mean square error(RMSE), Nash Sutcliffe efficiency coefficient (NSEC), mean absolute error (MAE), adjusted coefficient of determination(
). The results show that the flood stage forecasting model using SPW(stepwise) parameter estimation can carry out the river flood stage prediction better in comparison with others, and the flood stage forecasting model using LS(least square) parameter estimation is also found to be slightly better than the flood stage forecasting model using WLS(weighted least square) parameter estimation.
An Application of the HLLL Approximate Riemann Solver to the Shallow Water Equations
Hwang, Seung-Yong ; Lee, Sam Hee ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 21~27
The HLLL scheme, proposed by T. Linde, determines all the wave speeds from the initial states because the middle wave is evaluated by the introduction of a generalized entropy function. The scheme is considered a genuine successor to the original HLL scheme because it is completely separated form the Roe's linearization scheme unlike the HLLE scheme and does not rely on the exact solution unlike the HLLC scheme. In this study, a numerical model was configured by the HLLL scheme with the total energy as a generalized entropy function to solve governing equations, which are the one-dimensional shallow water equations without source terms and with an additional conserved variable relating a concentration. Despite the limitations of the first order solutions, results to three cases with the exact solutions were generally accurate. The HLLL scheme appeared to be superior in comparison with the other HLL-type schemes. In particular, the scheme gave fairly accurate results in capturing the front of wetting and drying. However, it revealed shortcomings of more time-consuming calculations compared to the other schemes.
Estimation for Runoff based on the Regional-scale Weather Model Applications:Cheongmi Region
Baek, JongJin ; Jung, Yong ; Choi, Minha ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 29~39
Climate change has been obtained researchers' interest, especially in water resources engineering to adjust current conditions to the new circumstance influenced by climate change. In this study, WRF-ARW will be evaluated the capability to estimate distributed precipitation using global weather information instead of the data from rainfall observatory or radar. Cheongmi watershed is selected and adopted to generate a distributed rainfall-runoff model using ModClark. The results from the distributed model with precipitation data from WRF-ARW and the lumped model using observed precipitation data were compared to the observed discharge values. The final results showed that the distributed model, ModClark generated similar pattern of hydrograph to the observations in terms of the time and amount of peak discharge. In addition, the trend of hydrograph from the distributed model presented similar pattern to the observations.
Determination of Investment Priority for River Improvement Project at Downstream of Dams Using PROMETHEE
Kim, Gil Ho ; Sun, Seung Pyo ; Yeo, Kyu Dong ; Kim, Hung Soo ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 41~51
Sometimes, there exist many alternatives for doing a SOC project. However, the limitation of the fund requires the determination of investment priority for the alternatives. This may be performed according to the degree of importance of individual alternatives. Especially, the river improvement project at the downstream of dams has complex and various values and this characteristics make it difficult decision-maker to do reasonable determination. This study aims to determine an investment priority of 33 alternatives in the river improvement project at the downstream of dams using PROMETHEE method which has advantages in determining the priority. In this study, we determined evaluation criteria and attributes by considering the functions and objectives of the river improvement project at the downstream of dams. The eigenvector method in AHP was used to estimate the relative importance of evaluation criterion. Based on the estimation, we determined investment priority of 33 alternatives by PROMETHEE method and the priority of alternatives was derived in the order of Juam regulation dam, Unmun dam, Yongdam dam and so on. The results of this study could provide a reasonable standard to the decision-maker for the determination of investment priority of alternatives.
Numerical Simulations of Developing Mining Pit using Quasi-Steady Model
Choi, Sung-Uk ; Choi, Seongwook ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 53~57
This study presents a numerical model that is capable of simulating the evolution of mining pit in a stream. The numerical model is based on the quasi-steady assumption that the flow is steady with time-dependent morphological change. This hypothesis is valid due to the fact that the stream morphology changes over a long period compared with the time of flow change. Before applications, numerical experiments are carried out with two total load formulas such as Engelund and Hansen's (1967) and Ackers and White's (1973). It is found that the use of Engelund and Hansen's formula reproduces evolution of mining pit best compared with simulated profiles in Parker (2004). Then, the model is applied to two laboratory experiments in the literature. In general, the numerical model simulates properly the evolution of mining pit in laboratory open-channels. However, it is found that the model does not reproduce head-cutting, propagating upstream, and under-estimates the wave of the bed, propagating downstream, after finishing the re-fill of the mining pit.
Evaluation of Partial Safety Factors for Tetrapod Armor Blocks Depending on the Shape Parameter of Extreme Wave Height Distributions
Kim, Seung-Woo ; Suh, Kyung-Duck ; Lee, Dong-Young ; Jun, Ki-Cheon ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 59~69
Probabilistic design is required to effectively consider the coastal environment of great uncertainty. However, designers who are familiar with the deterministic design method prefer a method which is similar to the existing method but is based on the probabilistic concept. Therefore, the partial safety factor method has been adopted as a new design method over the world. In Korea, Tetrapod is widely used for armoring rubble mound breakwaters. Even though the partial safety factor method developed in the United States and Europe covers Tetrapods, the limited wave and structure conditions in its development make the engineers hesitate about its use in practical breakwater design. In this study, partial safety factors for Tetrapod armor blocks have been developed by analyzing 116 breakwater cross-sections and wave conditions in 16 trade harbors and 15 coastal harbors with the FORM and optimal code calibration approach. Especially, partial safety factors have been proposed depending on the shape parameter of the Weibull extreme wave height distribution. For other types of extreme distributions, it is possible to apply the proposed partial safety factors using the relationship between skewness coefficient and shape parameter. Finally, the proposed partial safety factors have been applied to existing structures to show that they better satisfy the target reliability of the structures than previous partial safety factors.
Comparision of Physical Habitat Suitability Index for Fishes in the Rivers of Han and Geum River Watersheds
Kang, Hyeongsik ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 71~78
The habitat suitability is an important factor to estimate the distribution and size of the physical habitat in river. This suitability is also a key factor to decide the ecological flow discharge for the fish. For the ecological analysis in river, accurate values of habitat suitability index for various fishes are necessary. In general, fish habitat is affected by the physical factor of the flow depth and velocity as well as the chemical and biological factors of nutrient and attached algae. Thus, the condition of the fish habitat is expected to be changed with each watershed and tributary. In this study, the habitat suitability indices for fishes were proposed by using the field monitoring data in the rivers of the Han and Geum river watersheds. The proposed indices for three fishes are compared: Zacco platypus, Zacco temminckii, and Coreoleuciscus splendidus. The results show that Zacco platypus has a similar distribution of habitat suitability index in two watersheds. Zacco temminckii and Coreoleuciscus splendidus, however, have different distributions with watersheds. Also, for Zacco platypus, the developed indices at three tributaries of the Han river are compared: Cheng-mi stream, Dal stream, and Hong-cheon stream. The comparision shows that the index in the Cheng-mi stream is different with those in the other rivers. This is expected to be because of a high nutrient concentration at the Cheong-mi stream.
Continuous Nitrate Removal using Bipolar ZVI Packed Bed Electrolytic Cell
Jeong, Joo-Young ; Kim, Han-Ki ; Shin, Ja-Won ; Park, Joo-Yang ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 79~84
Nitrate is a common contaminant in groundwater aquifer. The present study investigates the performance of the bipolar zero valent iron (ZVI,
) packed bed electrolytic cell in removing nitrate in different operating conditions. The packing mixture consists of ZVI as electronically conducting material and silica sand as non-conducting material between main cathode and anode electrodes. In the continuous experiments for the simulated wastewater (contaminated groundwater, initial nitrate about 30 mg/L as N and electrical conductivity about 300
), over 99% removal of nitrate was achieved in the applied voltage 600 V and at the flow rate of 20 mL/min. The optimum packing ratio (v/v) and flow rate were determined to be 1:1~2:1 (silica sand to ZVI), 30 mL/ min respectively. Effluent pH was proportional to nitrate influx concentration, and ammonia which is the final product of nitrate reduction was about 60% of nitrate influx. Magnetite was observed on the surface of the used ZVI as major oxidation product.
Research on Remediation of Trichloroethylene using Zero Valent Iron Bipolar Packed Bed Electrodes
Park, Yu-Ri ; Shin, Ja-Won ; Park, Joo-Yang ;
Journal of The Korean Society of Civil Engineers, volume 32, issue 1B, 2012, Pages 85~91
Permeable Reactive Barriers (PRBs) using zero valent iron (ZVI,
) is a promising technology for in-situ remediation of trichloroethylene (TCE) forming dense non aqueous phase liquid (DNAPL). The objective of this study is to develop an enhanced treatment method of trichloroethylene-contaminated groundwater using ZVI packed bed with direct current (D.C.). A column experiment was performed to investigate degradation efficiency of TCE that was performed in three different combination of control (only sand), ZVI column (ZVI:sand, packing ratio 1:2(v/v)) and bipolar column (ZVI:sand=1:2(v/v) with electric current) in the test columns. As the results of this study, the degradation efficiency of TCE was improved with simultaneous application of both bipolar column compared to that used ZVI column. Because ZVI particles are isolated and individual particles act like small electrodes. In this experiment, it was indicated a basic material for application of bipolar packed bed as electro-PRBs that was effective degradation of TCE.