Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
Editor in Chief :
Volume & Issues
Volume 31, Issue 6D - Dec 2011
Volume 31, Issue 6C - Dec 2011
Volume 31, Issue 6B - Dec 2011
Volume 31, Issue 6A - Dec 2011
Volume 31, Issue 5D - Oct 2011
Volume 31, Issue 5C - Oct 2011
Volume 31, Issue 5B - Oct 2011
Volume 31, Issue 5A - Oct 2011
Volume 31, Issue 4D - Aug 2011
Volume 31, Issue 4C - Aug 2011
Volume 31, Issue 4B - Aug 2011
Volume 31, Issue 4A - Aug 2011
Volume 31, Issue 3D - Jun 2011
Volume 31, Issue 3C - Jun 2011
Volume 31, Issue 3B - Jun 2011
Volume 31, Issue 3A - Jun 2011
Volume 31, Issue 2D - Apr 2011
Volume 31, Issue 2C - Apr 2011
Volume 31, Issue 2B - Apr 2011
Volume 31, Issue 2A - Apr 2011
Volume 31, Issue 1D - Feb 2011
Volume 31, Issue 1C - Feb 2011
Volume 31, Issue 1B - Feb 2011
Volume 31, Issue 1A - Feb 2011
Selecting the target year
Sediment Transport Characteristics in a Pressure Pipeline
Son, Kwang Ik ; Kim, Hyun Jung ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 205~209
The low carrying capacity caused by the deposition in a sewer line is one of the main reason of the urban flood. Therefore, an efficient maintenance and management of the storm water drainage system is very important to prevent urban flood. In this research, the sediment transport characteristics through a pressure pipeline were examined with laboratory experiments. Bed-forms in a pipeline, sediment rates, roughness due to sediments were examined. Experimental system consists of flow circulation system with a pump and a sediment feeder at the upstream of the pipeline. Sediments were supplied into a 60 mm-diameter and 8 m-long pipe. Maximum flow rate is
, and the sediment feeding rate range is 5 g/s~19 g/s. Governing parameters and estimation equation for sediment transport rate were developed. The mean velocity (U), coefficient of viscosity (
), unit width bed load (
), mean diameter of particle (
), unit weight of sediment in water (
) were adopted as the most influencing factors of sediment transport patterns. The prediction equation for sediment transport rate were developed with two dimensionless terms. These two dimensionless terms showed a linear relationship with high correlation coefficient.
A Conceptual Soil Water Model of Catchment Water Balance: Which Hydrologic Components are Needed to Calibrate the Model?
Choi, Daegyu ; Yang, Jeong-Seok ; Chung, Gunhui ; Kim, Sangdan ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 211~220
In this study a conceptual soil water model is proposed to simulate water balance at catchment scale. The model is based on the sequential separation of daily precipitation into surface runoff, wetting, vaporization, and percolation. The proposed model is calibrated by using three observation sets: empirically estimated annual vaporization, monthly wetting estimated by NRCS-CN method, and both of them. The model performance is evaluated to understand which hydrologic components for calibrating the model are needed. It is shown that both of annual vaporization and monthly wetting are indispensable hydrologic components to simulate reasonably precipitation partitioning.
Applying Evaluation of Soil Erosion Models for Burnt Hillslopes - RUSLE, WEPP and SEMMA
Park, Sang Deog ; Shin, Seung Sook ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 221~232
Applicability of three soil erosion models for burnt hillslopes was evaluated. The models were estimated with the data from plots established after tremendous wildfire occurred in the east coastal region. Soil erosion and surface runoff were simulated by the Water Erosion Prediction Project (WEPP) and the Revised Universal Soil Loss Equation (RUSLE) of application mode for disturbed forest areas and the Soil Erosion Model for Mountain Areas (SEMMA) developed for burnt hillslopes. Simulated sediment yield and surface runoff were compared with the measured those. In maximum value of sediment yield, three models was under-predicted and RUSLE and WEPP had difference of over two times. SEMMA showed the best model response coefficient, determination coefficient and the model efficiency. In application of models to the soil erosion according to the elapsed year after wildfire, all models were underestimated in initial stage disturbed by wildfire. Evaluation of models in this burnt hillslopes was shown the tends to under-predict soil erosion for larger measured values. Although a lot of sediment can be generated in small rainfall event as fine-grained soil of the high water repellency was exposed excessively right after wildfire, this under-prediction was shown that those models have a limit to estimate the weighted factors by wildfire.
Quantification of Directional Properties of Channel Network and Hill Slope
Park, Changyeol ; Yoo, Chulsang ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 233~242
This study quantified directional properties of channel network and hill slope for a river basin by applying the von Mises distribution, also examined the relation between them. Ultimately, it was examined that whether the directional properties of channel network and hill slope have a certain relation, which might be considered to the rainfall-runoff modeling. From the results derived by analyzing the Naesung stream basin, the von Mises distribution was found well to explain the directional characteristics of directional properties of channel network. There was a clear relation between directional properties of channel network and hill slope. The higher-order streams also showed very obvious modal characteristics. The results derived in this study could be helpful to estimate more quantitatively the difference in the runoff response with respect to the directional properties of channel network and hill slope.
Evaluation of Drought Risk in Gyeongsang-do Using EDI
Park, Jong Yong ; Yoo, Ji Young ; Choi, Minha ; Kim, Tae-Woong ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 243~252
The change of rainfall pattern due to recent climate change increases the occurrence probability of drought in Korea. Unlike other natural disasters, a drought has long duration, extensive area subject to damage, and greater socioeconomic damage than other disasters. In order to evaluate drought severity, meteorological drought indices are mainly used in practice. This study presents a more realistic method to evaluate drought severity considering drought climate factors as well as socioeconomic factors which are vulnerable to disaster. To perform a spatial evaluation of drought risk in Gyeongsang-do, drought risk was defined and analyzed through the hazard index and the vulnerability index. The drought hazard index was spatially assessed using the drought index and GIS. The drought vulnerability index was also spatially assessed using the 5 socioeconomic factors. As a result, the drought risks were compared and used for evaluating regional drought risk considering regional characteristics of Gyeongsang-do.
The Assessment of Socioeconomic Droughts Using a Water Excess Deficiency Index
Yoo, Ji Young ; Park, Jong Yong ; Kim, Tae-Woong ; Park, Moo Jong ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 253~264
Drought assessment is usually performed qualitatively and/or quantitatively after defining a drought from meteorological, agricultural, hydrological, and socioeconomic perspective. Most of the drought analyses focus on meteorological, agricultural, and hydrological droughts, whereas the socioeconomic drought evaluation has been not actively performed since it needs different aspects. In this study, after defining a socioeconomic drought applicable to assess droughts in Korea, we suggested Water Excess Deficiency Index (WEDI) as an useful tool to evaluate socioeconomic droughts, based on water demand condition and water supply condition. This study verified the validity of WEDI by comparing with other drought indices (SPI, PDSI) and historical drought condition in Gyeongsang-do in 2001. The results indicated that the WEDI can be used to assess regional droughts in a socioeconomic perspective.
The Correlation Between the Moving Average of Precipitation and Groundwater Level in Korea
Yang, Jeong-Seok ; Kim, Nam-Ki ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 265~276
Precipitation data and groundwater level data were collected for Korean peninsular and Jeju island. The relationship between precipitation and groundwater level and the correlation between the moving average of precipitation and goundwater level were analyzed. Critical infiltration, which is the spatially averaged maximum daily infiltration depth over interested region, is considered when the precipitation data was modified for moving average process and correlation between the moving average of modified precipitation and groundwater level. High correlation regions, which have greater than 0.6 correlation coefficients, were selected after the analysis with ciritical infiltration. Twenty-six regions were selected for high correlation regions. If we divide the regions by administrative district, there are nine regions for Gyungsang-Do, five regions for Chunchung-Do, four regions for Gyunggi-Do and Gangwon-Do, three regions for Jolla-Do, and one region for Jeju island. The groundwater level data for high correlation regions shows obvious response after precipitation event and there are few cases with abrupt change in groundwater level without precipitation-related event.
Development of Daily Rainfall Simulation Model Using Piecewise Kernel-Pareto Continuous Distribution
Kwon, Hyun-Han ; So, Byung Jin ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 277~284
The limitations of existing Markov chain model for reproducing extreme rainfalls are a known problem, and the problems have increased the uncertainties in establishing water resources plans. Especially, it is very difficult to secure reliability of water resources structures because the design rainfall through the existing Markov chain model are significantly underestimated. In this regard, aims of this study were to develop a new daily rainfall simulation model which is able to reproduce both mean and high order moments such as variance and skewness using a piecewise Kernel-Pareto distribution. The proposed methods were applied to summer and fall season rainfall at three stations in Han river watershed in Korea. The proposed Kernel-Pareto distribution based Markov chain model has been shown to perform well at reproducing most of statistics such as mean, standard deviation and skewness while the existing Gamma distribution based Markov chain model generally fails to reproduce high order moments. It was also confirmed that the proposed model can more effectively reproduce low order moments such as mean and median as well as underlying distribution of daily rainfall series by modeling extreme rainfall separately.
Validation of Energy and Water Fluxes Using Korea Land Data Assimilation and Flux Tower Measurement: Haenam KoFlux Site's Hydro-Environment Analysis
Kim, Daeun ; Lim, Yoon Jin ; Lee, Seung Oh ; Choi, Minha ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 285~291
Accurate assessment of the water and energy cycles is essential to understand hydrologic, climatologic, and ecological processes. Common Land Model (CLM) is one of the well-developed Soil-Vegetation-Atmosphere Transfer (SVAT) models based on the water and energy balance equation for accurate prediction of hydro-environmental cycles. The CLM can estimate realistic and reliable results using relatively simple parameters. It has been widely used in the world, however in Korea practical applications of the CLM are rare due to lack of information and input data. In this study, the CLM with Korea Flux network (KoFlux) and Kore Land Data Assimilation System (KLDAS) data were individually validated for domestic applications. This study showed that all comparisons between observations and model results from KoFlux and KLDAS had reasonable correlation with determination coefficient of 0.73~1.00 via regression. The results confirmed the applicability of the CLM and the possibility of the KLDAS usage for the region where input data are not existed.
Diagonalized Approximate Factorization Method for 3D Incompressible Viscous Flows
Paik, Joongcheol ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 293~303
An efficient diagonalized approximate factorization algorithm (DAF) is developed for the solution of three-dimensional incompressible viscous flows. The pressure-based, artificial compressibility (AC) method is used for calculating steady incompressible Navier-Stokes equations. The AC form of the governing equations is discretized in space using a second-order-accurate finite volume method. The present DAF method is applied to derive a second-order accurate splitting of the discrete system of equations. The primary objective of this study is to investigate the computational efficiency of the present DAF method. The solutions of the DAF method are evaluated relative to those of well-known four-stage Runge-Kutta (RK4) method for fully developed and developing laminar flows in curved square ducts and a laminar flow in a cavity. While converged solutions obtained by DAF and RK4 methods on the same computational meshes are essentially identical because of employing the same discrete schemes in space, both algorithms shows significant discrepancy in the computing efficiency. The results reveal that the DAF method requires substantially at least two times less computational time than RK4 to solve all applied flow fields. The increase in computational efficiency of the DAF methods is achieved with no increase in computational resources and coding complexity.
On Generation Methods of Multi-directional Random Waves in 3-D Numerical Wave Basin with Non-Reflected Wave Generation System
Hur, Dong-Soo ; Lee, Woo-Dong ; Jeon, Ho-Sung ; Yeom, Gyeong-Seon ;
Journal of The Korean Society of Civil Engineers, volume 31, issue 3B, 2011, Pages 305~308
In this study, generation methods of 3-D multi-directional random wave are examined using the fully non-linear numerical model with non-reflected wave generation system (LES-WASS-3D). Directional distribution functions obtained by EMLM method are compared for multidirectional random waves generated by various generation methods. As a results, it is revealed that multi-directional wave field can be simulated using LES-WASS-3D.