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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 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
Estimation and Analysis of Groundwater Becharge in Korea
Lee, Dong-Ryul ; Yoon, Yong-Nam ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 321~321
The objective of this study is to estimate groundwater recharge as an index of available water in the groundwater aquifers. Twenty stream gauging stations with watershed areas of
in six river basins were selected for analysis. Groundwater recession curves which were selected from daily runoff hydrographs are used to analyze the characteristics of recession and to estimate groundwater recharge. Groundwater recession was found to occur each year during two periods in the river basins studied: April through early July and September through late February. Groundwater recharge was estimated from the daily hydrographs. The relationships between groundwater recharge, precipitation and watershed area were analyzed in each river basin. The amount of precipitation which produced no recharge was also estimated from the relationship between precipitation and groundwater recharge. This value is defined as 'Marginal Precipitation for Groundwater Recharge(MPGR)'. It was found that MPGR during the period of January through September was nearly equal to the actual evaportranspiration during the same period. There is very few direct relationship between the recharge and the size of watershed area in each river basin in this study. Therefore the groundwater recharge estimated from a few stations with reliable hydrographs may suffice to represent the recharge of each concerning river basin.
The Selection of Appropriate Probability Distributions for Annual Maximum Rainfall Data
Kim, Kyung-Duk ; Heo, Jun-Haeng ; Cho, Won-Cheol ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 335~335
The main procedure of frequency analysis is to select appropriate probability distributions fitted well to the observed data. In this study, 13 probability distribution functions were assumed to be underlying distributions for annual maximum rainfall data. The parameters of each probability distribution function were estimated by methods of moment, probability weighted moments, and maximum likelihood. The appropriate probability distribution for the applied rainfall data was selected by considering parameter validity. goodness of fit tests, and separation effects. As a result, GEV model was selected to be an appropriate probability distribution for annual maximum rainfall data of considered durations in Korea.
Three-Dimensional Boundary Integral Equation Method: Interior Element Calculation
Cho, Yong-Sik ; Cho, Soon-Ho ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 345~345
When a three-dimensional boundary integral equation model is used to calculate hydrodynamic pressures acting on a hydraulic structure such as a dam-reservoir system, the numerical calculation can be performed only on boundaries without considering inside the system. However, additional integrals should be done to obtain the physical information inside the dam-reservoir system. In this study, analytical expressions are obtained after converting these additional surface integrals into line integrals.
A Study on the Increment of Storage Capacity and Effective Management Techniques of Paldang Dam
Seo, Kyu-Woo ; Park, Sang-Deog ; Cho, Won-Cheol ; Lee, Won-Hwan ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 351~351
This paper concerns the storage capacity of reservoir and management techniques of Paldang Dam, located just below the downstream of South and North Han Rivers. The hydraulic and hydrologic characteristics of the downstream and upstream of the dam have been changed significantly since the dam was constructed. In this study, total sediment load including pollutants was estimated for the storage capacity of Paldang reservoir. Also, the dredging is necessary to improve reservoir capacity and water quality. We proposed the possible dredging load and estimated expected sediment load for future 25 years and 50 years after dredging.
A Study on the Optimal Location of Pumping Stations in Branched Pipeline Systems
Kim, Joong-Hoon ; Geem, Zong-Woo ; Kim, Han-Joo ; Kim, Tae-Gyun ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 361~361
The objective of this paper is to develop an optimal design model for branched pipeline systems which also can locate the optimal pumping stations using linear programming. The developed model considers hydraulic influences of some appurtenances such as supply tunnels, parallel pipelines and a filtration plant. The model also considers tunnel construction cost which should be treated differently from pipe construction cost using a penalty method. Different from the other models presently available, the model guarantees a nonnegative pressure at every junction node in the system. The objective function includes annual operation cost (electricity rate) in addition to initial construction cost, thus producing a more reasonable optimal decision. The model selects the optimal diameter not in the form of continuous diameter but in the form of commercial discrete diameter using the pipe lengths as decision variables instead of the pipe diameters. The model not only determines the optimal pumping heads for each pumping station selected but also finds the optimal location and the number of pumping stations. Sensitivity analysis on the interest rate is carried out. As the interest rate is increased. annual operation cost is increased, and the portion of pumping is increased with less investment for the piping system. The model has been applied to an existing pipeline system. The results show that the optimization model provides more economical decision, and can be put into practice successfully.
Estimation of the Flood Arrival Time by Serial Correlation Analysis Method
Kim, Yang-Su ; Kim, Won ; Seong, Kee-Won ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 371~371
Reasonable estimation of the flood arrival time is very important for the operation of flood forecasting and warning system. This study is focused on estimation of arrival time of the flood hydrograph. The serial correlation analysis method (SCAM) is suggested for more reasonable estimation of flood hydrograph arrival time using observed flood events, and applied in the downstream of Daecheng Dam of Geum river system and Paldang Dam of Han river system. As a results we noted that the SCAM is effective for analysis of the arrival time of the flood hydrograph. and also find that the ratio of the flood wave celerity estimated by the SCAM and the observed mean stream velocity is about 1.5-2.1 from Maepo to Guam river stage gauging station of the Geum river system.
A Study of Waves in the Estuary of Nakdong River
Park, Sang-Kil ; Choi, Byoung-Seub ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 379~379
For the analysis of waves in the estuary of a large river, a numerical model of wave deformation was applied to the Nakdong Estuary and the surveying data was analyzed. In this study, wave deformation model is used, which is based on wave ray method by Orr and Herbich. The wave ray method which shows the wave refraction pattern graphically verified the growth of sand bar in the Estuary as a result of sediment transport by waves. From the wave refraction pattern of Nakdong Estuary, it is found that erodible and depositional waves are qualitatively existent in the Estuary.
Long Waves Generated by Short Wave Groups: Derivation of Governing Equations
Cho, Yong-Sik ; Chae, Jang-Won ; Cha, Young-Ki ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 389~389
The governing equations of long waves generated by short wave groups are systematically derived by using a multiple-scale perturbation method. The effects of water depth variation and shear current are included in the governing equations.
Characteristics of Leachate and Ways of Usage of Polluted Dredged Sediment in the Nak Dong River
Lee, Byoung-Ho ; Cho, Hong-Je ; Lee, Sang-Bae ; Ryu, Bum-Soo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 2_4, 1996, Pages 399~399
Characteristics of sediment in the Nak Dong River were investigated. 8 boring samples were taken in 4 different places along the river. Characteristics of all samples were analyzed with depth. The ratio of organic to inorganic matter heavy metal contamination, leaching test, and size distributions were investigated. Heavy metal (Cu and Hg) contamination appeared in a couple of places. Leaching tests showed that sediment may be a pollution source. When dredging should be performed to prevent recontamination from sediment, it is suggested how to use the dredged material. Because the portion of organic matter in sediment is low, burnig of sediment is not feasible. The sediment may be used as soil improving material in agricultural fields, or as light weigt aggregate. The dredged sediment may also be used as covering material in landfill sites.