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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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Korean Society of Civil Engeneers
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Volume & Issues
Volume 27, Issue 6D - Nov 2007
Volume 27, Issue 6C - Nov 2007
Volume 27, Issue 6B - Nov 2007
Volume 27, Issue 6A - Nov 2007
Volume 27, Issue 5D - Sep 2007
Volume 27, Issue 5C - Sep 2007
Volume 27, Issue 5B - Sep 2007
Volume 27, Issue 5A - Sep 2007
Volume 27, Issue 4D - Jul 2007
Volume 27, Issue 4C - Jul 2007
Volume 27, Issue 4B - Jul 2007
Volume 27, Issue 4A - Jul 2007
Volume 27, Issue 3D - May 2007
Volume 27, Issue 3C - May 2007
Volume 27, Issue 3B - May 2007
Volume 27, Issue 3A - May 2007
Volume 27, Issue 2C - Mar 2007
Volume 27, Issue 2A - Mar 2007
Volume 27, Issue 2D - Mar 2007
Volume 27, Issue 2B - Mar 2007
Volume 27, Issue 1D - Jan 2007
Volume 27, Issue 1C - Jan 2007
Volume 27, Issue 1B - Jan 2007
Volume 27, Issue 1A - Jan 2007
Selecting the target year
Development of HSPDA Model for Water Distribution System under Abnormal Operating Condition
Baek, Chun-Woo ; Kim, Joong-Hoon ; Jun, Hwan-Don ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 475~488
Solving hydraulic conditions in a water distribution system, two approaches are widely used, namely, demand-driven analysis (DDA) and pressure-driven analysis (PDA). In DDA, it is assumed that nodal demand is always satisfied regardless of pressure head at nodes and the unknown nodal heads are determined under this assumption. In PDA, it is assumed that nodal demand is fully satisfied only if the minimum required pressure head at that node(nodal head) is satisfied. If not, nodal demand is partially satisfied and is dependant on nodal head. For this reason, to simulate the hydraulic condition under PDA, the unknown nodal demand and the unknown nodal head are simultaneously solved and it is very difficult to solve. In general, DDA work well under normal operating conditions. However, it may generate unrealistic results to simulate hydraulic conditions under abnormal operating conditions such as pipe failure, temporal increase in demand and a fire event. In this study, the conceptual structure of a PDA model named HSPDA model is suggested. It consists of the Harmony Search which is one of the heuristic optimization algorithms and an hydraulic simulator, EPANET. Developed model is applied to simple water network to investigate whether the new model embodies the concept of PDA. The suggested model is applied to virtual water distribution systems under two abnormal conditions such as a pipe failure and fire demand to show its applicability. Moreover, the results of existing hydraulic simulation models and the suggested model are compared. As results, the developed PDA shows that it can simulate abnormal conditions efficiently.
Application of Rainfall Runoff Model for an Ungauged Catchment
Lee, Hyo-Sang ; Moon, Young-Il ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 489~498
Civil engineers are often required to predict streamflow for catchments with limited or no flow measurements for various water resources projects. The objective of this paper is to develop an appropriate method for predicting steamflow at ungauged catchment, through a regionalisation of rainfall-runoff models. This paper presents the establishment of regression relationships between 17 physical catchment characteristics and 5 parameters of a Probability distributed model (Moore, 1985) by using a database of 126 well-gauged UK catchments. These devoped relationships allow predictive models to be identified without calibration proceures. The catchment clustering is attempted to improve the relevance of the relationships: more and less permeable catchment types (i.e. BFIHOST = 0.5 is used as a criteria). Stepeeise regression equations are developed for each group individuelly. Nash Sutcliffe Effciency is used as an objective function. Furthermore, the uncertainty is indicated as confidence intervals on the estimated streamflow. The results show that there are no physically meaningful relationships between model parameters and catchment characteristics. The applications results indicate that the best regression model improves our capability to predict the higher flow range in the less permeable catchments. However, predicting low flows in these catchments, and the full range of flows in more permeable catchments are still remained as unsolved problems.
Derivation of Soil Moisture Probability Density Function Coupled with Stochastic Point Rainfall Model
Kim, Sang-Dan ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 499~506
A new stochastic model for the propagation analysis of fluctuations in rainfall to soil moisture dynamics is proposed with major focus on its probabilistic structure. This model is derived by using cumulant expansion theory from a stochastic differential equation with stochastic rainfall forcing which is incorporated by simple stochastic rainfall model, and has the advantage of providing the probabilistic solution in the form of a probability density function. Steady state probability density function for soil moisture is obtained analytically and analyzed for different climate, soil and vegetation conditions.
Validation of the Surface-Ground Waters Interaction and Water Supplying to Upper Region of Geum River Basin by Optimal Method for Drought Season
Cha, Kee-Uk ; Ko, Ick-Hwan ; Cheong, Tae-Sung ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 507~513
There are conflicts between Junbuk area where the municipal and industrial waters are supplied from Yongdam reservoir and Chungchung area located in downstream of Yongdam reservoir which reservoir supplies the municipal, the industrial, the agricultural water, and the instreamflow for river habitat after Yongdam reservoir construction in upper region of Geum River Basin. The Interactions between the surface and ground waters within the reservoir operation is an alternative plan as a solution of these conflicts problems in the area where drought are repeated periodically. The objective of this study is for suggesting the surface water and the ground water interactions which management scenarios are used in the cases of respecting to the water supply deficits for drought season or increasing of instreamflow in downstream of Yongdam reservoir. For the test simulation, the operation rules of the Yongdam reservoir is developed from LINGO optimization model, ground water recharge is estimated from the RORA method used in USGS, and stream depletion by pumping is estimated from the ground water modeling such as MODFLOW. The optimized reservoir operation rules, lag coefficients related in the interactions between the surface water and the ground water, and lag time intervals of return flow are used in KModSim developed in collaboration with Colorado State University. The KModSim simulation results show that the effective operations for the reservoir and ground water and surface water interactions significantly reduce the deficits of water supplies and instreamflow in downstream of Yongdam reservoir. Thus, the effective water resources management is proven with the optimized reservoir operation rules applied in Yongdam reservoir and interaction between the surface water and ground water.
Analysis of Hydrologic Behavior of SLURP Model Including Agricultural Reservoir Operation
Park, Min-Ji ; Park, Geun-Ae ; Kim, Seong-Joon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 515~523
This study is to analyse the hydrological behavior of agricultural reservoir using SLURP model. For the upsteam watershed of Gongdo water level gauge station in Anseongcheon watershed, the streamflows at 2 reservoir (Gosam and Geumgwang) locations and Gongdo station were simulated with reservoir inclusion and exclusion. The model was calibrated and verified using 5 years (1998, 1999, 2002, 2004, 2006) daily streamflow data in Gongdo station, and the Nash-Sutcliffe model efficiencies were 0.70~0.82% (1999, 2002, 2004) and 0.56, 0.61% (1998, 2006), respectively. The difference of runoff ratio between the simulation results of reservoir inclusion and exclusion at reservoir location showed difference ranging from 10.5% to 31.1% for 2 year cases. On the other hand, the difference of runoff ratio between the simulation results of two reservoir inclusion and exclusion at Gongdo station was 3.7%, 7.2%. This is caused by the storage and release operation of agricultural reservoirs for the runoff occurred at 2 reservoir watersheds.
Urban Stream Velocity Measurement System Utilizing Ubiquitous Floater and GIS
Yi, Jae-Eung ; Ji, Jung-Won ; Choi, Byung-Kyu ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 525~531
Due to unusual climate change, drought or flood happens frequently not only in Korea but also in all over the world, which leads to the serious damages and injuries in urban areas in addition to rural areas. To reduce damages from the flood and draught, stream discharge data collection with durability, consistency, and reliability should be guaranteed. But the current streamflow data collections are concentrated mainly on large river and the gauging stations are fixed at a certain location. Therefore, the development of system that can obtain discharge data anytime, anywhere is necessary to solve these problems. In this study, the urban stream velocity measurement system is developed which can aid to estimate an abnormal flow situations such as flood and drought quickly and accurately from remotely located personal computer by combining and estimating the stream discharge generated from an urban stream GIS and ubiquitous floater. Urban stream measurement system is tested and verified in Jungrang-cheon.
Daily Channel Flow Routing with Nonlinear Storage Equation
Kim, Nam-Won ; Lee, Byong-Ju ; Lee, Jung-Eun ; Lee, Jeong-Woo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 533~542
The objective of this study is to investigate the limitations of daily channel flow routing methods, and to present the new routing technique with nonlinear storage equation. To meet this objective, conventional routing methods such as Muskingum routing method and variable storage routing method were assessed at the daily time step, and then the enhanced daily channel flow routing model which is based on the nonlinear storage equation was developed to overcome the limitations of the conventional flow routing methods. In order to test the applicability of the newly suggested routing method for the real watershed, this channel flow routing model was added in the semi-distributed watershed model, SWAT, and the model was applied for the Chungju Dam basin. The simulated results were found to be more realistic than those of the conventional routing methods. The channel routing model presented in this study will give good contribution for accurate simulations of channel flow, sediment and nutrient transports in channels.
The Study on the Runoff Mechanism of Cheonggyecheon at the Aspect of Disaster Management
Jeong, Chang-Sam ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 543~551
The main purpose of this study is to analyze the runoff mechanism of Cheonggyecheon at the aspect of disaster management. Restored Cheonggyecheon at the downtown of Seoul changed environment of this urban stream dramatically. After restoration, fast rising of water level and easily opened water gates which were located at the each side make it difficult to control this stream. Historical hydrologic data became useless and there were not so many data to control. We analyzed the mechanism of rainfall-runoff using GIS data and field monitoring, also quantified the water gate opening at the respect of rainfall. Through these some basic information were given to mitigate the disaster of Cheonggyecheon.
Extended Boussinesq Equations for Rapidly Varying Topography
Kim, Gun-Woo ; Lee, Chang-Hoon ; Park, Woo-Sun ; Suh, Kyung-Duck ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 553~562
We investigated the transformation of water waves over rapidly varying topography which is simulated by the extended Boussinesq equations. We found that mild-slope assumption was made during their derivation. Thus, both the bottom curvature and squared bottom slope terms are neglected in the equations of Madsen and Sorensen (1992) and the squared bottom slope terms are neglected in the equations of Nwogu (1993). We developed a new model which extends the model of Madsen and Sorensen by including both the bottom curvature and squared bottom slope terms. Numerical experiments were conducted to measure numerical results of the reflection coefficient of waves over the Booij's (1983) planar slope by varying incident wave periods. Nwogu's model results are accurate for a mild slope but inaccurate for a steep slope. Madsen and Sorensen's model results are not accurate for all the slopes in the intermediate water depth. The new developed model results are accurate for a mild slope but inaccurate for a steep slope in the intermediate water depth. The inaccuracy in the intermediate water depth comes from that the long wave approximation was made in improving the model's dispersion characteristics. Numerical experiments were also conducted to measure the reflection coefficient of waves over the Davies and Heathershaw's (1984) ripple. The solutions of both the Nwogu's model and the developed model are accurate because these models include the bottom curvature terms. However, the solutions of Madsen and Sorensen are inaccurate due to the neglect of the bottom curvature terms.
The Evaluation of the Environmental Amenity in Jeju Sand Beach by Questionnaire Survey
Kim, Nam-Hyeong ; Kang, Hyang-Hye ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5B, 2007, Pages 563~572
Recently, the interest about the use and development of natural environment or protection and preservation of that at the coastal area in Korea has variously increased. The case when the promotion direction of a public project at the coastal area is decided by citizen's participation is also increased. Our country is surrounded by sea of 3 or 4 sides, so the coastal area would be also important resources from now on. To grasp the characteristics of the environmental element in progressing such a eco-friendly development at the coastal area has to be precedent. But now in Korea, the quantitative investigation of environment characteristics through measuring has carried out before development, but the investigation which grasps the qualitative characteristics through the perception survey of a local resident or visitor is very rare. Hence it is difficult to assess the values and the coastal environmental characteristics. Therefore by this research, through the Questionnaire survey, the environment characteristics in jeju sand beach were investigated. All beaches were classified into 4 groups using the Cluster Analysis and Principal Component Analysis (PCA). It was impossible to understand developmental direction and maintenance alternative needed in sand beach received low evaluation to receive more high evaluation.