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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Water Resources Association
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Journal DOI :
Korea Water Resources Association
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Volume & Issues
Volume 31, Issue 6 - Dec 1998
Volume 31, Issue 5 - Oct 1998
Volume 31, Issue 4 - Aug 1998
Volume 31, Issue 3 - Jun 1998
Volume 31, Issue 2 - Apr 1998
Volume 31, Issue 1 - Feb 1998
Volume 21, Issue 3 - 00 1998
Selecting the target year
Nonlinear Interaction between the Permeable Submerged Breakwater and Third Order Stokes Waves
Jeong, Yeon-Tae ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 223~234
Recently, the interests of the construction of the permeable submerged breakwaters have been increased to preserve and to improve the coastal environment, and to control the incident waves and littoral transport. It is very important to predict the wave transformation precisely over the permeable submerged breakwaters. This study discusses nonlinear wave transformation and characteristics by using BEM based on the frequency domain method of the 3rd-order Stokes waves. The Dupuit-Forchheimer formula is applied to the analysis of the fluid resistance of rubble stones, and the equation about equivalent linear frictional coefficient is newly modified based on the Lorentz's condition for the equivalent work. The numerical results are compared with the experimental ones for verification. These two results give a close agreement each other. It is confirmed that the present method of the 3rd-order Stokes waves estimates more precisely than that of the 2nd-order Stokes waves. Keywords : third-order Stokes waves, frequency domain method, permeable submerged breakwater, nonlinear wave transformation, equivalent linear frictional coefficient
Flood Analysis in the Tidal Reaches of the Nakdong River
Lee, Ju-Heon ; Lee, Eun-Tae ; Lee, Do-Hun ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 235~242
The objective of this study is to develope a predictive model for flood forecasting in the tidal reaches of the Nakdong river and to analyze the tidal effects of major flood forecasting station of the Nakdong river by using the hydraulic flood routing. In the calibration process the optimum roughness coefficients as functions of channel reach and discharge were determined and the calibration results suggest that the unsteady hydraulic flood routing model simulated with the optimum roughness coefficients showed close agreement between the calculated and observed stage. Keywords : hydraulic flood routing, 1-D unsteady flood model, roughness coefficients
The Sensitivity Analysis of Parameters of Urban Runoff Models due to Variations of Basin Characteristics (I) - Development of Sensitivity Analysis Method -
Seo, Gyu-U ; Jo, Won-Cheol ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 243~252
In this study, the new dimensionless values were defined and proposed to determine the parameters of urban runoff models based on the relative sensitivity analysis. Also, the sensitivity characteristics of each parameter were investigate. In order to analyze the parameter sensitivities of each model, total runoff ratio, peak runoff ratio, runoff sensitivity ratio, sensitivity ratio of total runoff, and sensitivity ratio of peak runoff were defined.
And for estimation of sensitivity ratios based on the scale of basin area, rainfall distributions and rainfall durations in ILLUDAS & SWMM, the reasonable ranges of parameters were proposed.
The Sensitivity Analysis of Parameters of Urban Runoff Models due to Variations of Basin Characteristics (II) - Model Calibration and Application -
Seo, Gyu-U ; Heo, Jun-Haeng ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 253~267
In this study, ILLUDAS and SWMM were applied for Dongsucheon basin, Incheon and Test basin, Cheongju. The main parameters (II, IA, IS, SI, SR, SS) which are included in those of each model depending on runoff results were determined, and sensitivity ratios were estimated in order to evaluate and compare the characteristics of each modEL. Total runoff ratio for almost parameters turned out to have a linear relation to the rainfall durations and the scale of basin area but have nothing to do with rainfall distributions. Sensitivity ratios turned out to have a linear relation for the infiltration and soil parameters of ILLUDAS as well as all parameters of SWMM. ronoff sensitivity ratios for almost parameters were smaller than 1.0 because the impacts of total runoff were bigger than those of peak runoff. And runoff sensitivity ratio was equal to 1.0 for the roughness coefficient of SWMM. Total runoff ratio, peak runoff ratio and runoff sensitivity ratio for the selected parameters of those models were presented asthe tables and figures according to the scale of basin area, rainfall durations such as 60, 120, and 180 minutes and Huff's 4th quartiles rainfall distributions. Keywords : ILLUDAS, SWMM, parameter, sensitivity analysis, sensitivity ratio.
Experimental Study for Protection of Local Scouring around Bridge Pier in a Curved Channel
Choe, In-Ho ; Park, Yeong-Jin ; Song, Jae-Woo ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 269~277
Laboratory flume experiments to investigate the characteristics of the flows and local scour around circular bridge pier in a curved channel are performed. In this study, the effect of a circular collar device for controlling the depth of scour is examined. The scour depth with a collar is about 40% of the scour depth without collar in the straight course of the flume while it is about 44% of the scour depth without collar at the location of 150' in the curved channel. As the results of experiments using the collar of which diameter is twice of pier, the reduction of scour depth is the most effective in a straight channel when the location of collar is 0.2h( h:depth) below the channel bottom. And, the reduction of scour depth is the most effective in a curved channel when the location of collar is 0.1h below the channel bottom. Keywords : transverse bed slope, scour, protection of local scouring, collar, channel bend
Two-Dimensional Finite-Volume Unsteady-Flow Model for Shocks
Lee, Gil-Seong ; Lee, Seong-Tae ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 279~290
The height and speed of the shock wave are critical data in flood-control operations or in the design of channel walls and bridges along rivers with high flow velocities. Therefore, a numerical model is needed for simulating flow discontinuity over a wide range of conditions. In this study, a governing equation. As a Riemann solver Roe(1981)'s one is used. The model employs the modified MUSCL for handling the unstructured grids in this research. this model that adopts the explicit tradditional twl dimmensional dam break problems, two hydraulic dam break model is simulations, and a steady state simulation in a curved channel. Conclusions of this research are as follows : 1) the finite volume method can be combined with the Godonov-type method that is useful for modeling shocks. Hence, the finite volume method is suitable for modeling shocks. 2) The finite volume model combined with the modified MUSCL is successful in modeling shock. Therefore, modified MUSCL is proved to be valid. Keywords : shock wave, shallow water equation, Godunov-type scheme, finite volume method, modified MUSCL, unstructured girds.
An Experimental Study on the characteristics of Flow and Bed Topography with Changing Bed Material in a Curved Channel
Jeong, Jae-Uk ; Yun, Se-Ui ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 291~301
The objective of this study is to analyze the characteristics of flow and bed topography with changing bed material in a 180-degree, with constant-radius curved experimental channel. Sand(
= 0.56 mm, s = 2.65) and anthracite(
= 0.26 mm, s = 1.54) were selected as bed materials. The maximum scour depth was found to be about two times for the mean flow depth at the outer bank of bend angle
, and in case of anthracite, it was found upper part of bend angle
than that of sand. Regardless of bed materials the path of maximum streamwise velocity is skewed inwards in the upper part of the bend, the maximum velocity shifts outwards, and it lagged downward as bed roughness increases. The maximum skewed angle of flow grows faster in the smooth bottom than in the rough one, and its value also increases. The secondary flow in anthracite bottom was measured larger than that of sand one, and two cells of secondary flow was found in this experiment.
Grid-Based KlneMatic Wave STOrmRunoff Model (KIMSTORM)(I) - Theory and Model -
Kim, Seong-Jun ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 303~308
A grid-based KInematic were STOrm Runoff Model (KIMSTORM) with predicts temporal and spatial distributions of saturalted orerland flow, subsurface flow and stream flow in a watershed was developed. The model adopts the single overland flowpath algorithm and simulates surface and/or subsurface water depth at each grid element by using grid-based water balance of hydrologic components. The model which is programmed by C-language uses ASCII-formatted map data supported by the irregular gridded map of the GRASS(Geographic Resources Analysis Support System) GIS and generates the spatial distribution maps of discharge, flow depth and soil moisture within the watershed. Keyword : Kinemati wave, storm runoff model, GRASS-GIS, grid-based water balance
Grid-Based KlneMatic Wave STOrm Funoff Yoncheon Dam watershed.
Kim, Seong-Jun ; Chae, Hyo-Seok ; Sin, Sa-Cheol ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 309~315
The grid-based KIneMatic wave STOrm Runoff Model (KIMSTORM) was applied to YoncheonDam watershed (1,875km2) located in the Imjin river basin of the Korea. Six maps which are DEM(Digital Elevation Model), stream, flow path, soil, land use and Thiessen network, were used for input data. The simulated streamflows resulting from two selected storm events agreed well with the observed flows at the watershed outlet. The results of temporal variations and spatial distributions are presented by using GRASS. Keyword : grid-based, storm-runoff model, GRASS-GIS, Yoncheon dam watershed.
Water Supply forecast Using Multiple ARMA Model Based on the Analysis of Water Consumption Mode with Wavelet Transform.
Jo, Yong-Jun ; Kim, Jong-Mun ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 317~326
Water consumption characteristics on the northern part of Seoul were analyzed using wavelet transform with a base function of Coiflets 5. It turns out that long term evolution mode detected at 212 scale in 1995 was in a shape of hyperbolic tangent over the entire period due to the development of Sanggae resident site. Furthermore, there was seasonal water demand having something to do with economic cycle which reached its peak at the ends of June and December. The amount of this additional consumption was about
on June and
on December. It was also shown that the periods of energy containing sinusoidal component were 3.13 day, 33.33 hr, 23.98 hr and 12 hr, respectively, and the amplitude of 23.98 hr component was the most humongous. The components of relatively short frequency detected at
[i = 1,2,…12] scale were following Gaussian PDF. The most reliable predictive models are multiple AR[32,16,23] and ARMA[20, 16, 10, 23] which the input of temperature from the view point of minimized predictive error, mutual independence or residuals and the availableness of reliable meteorological data. The predicted values of water supply were quite consistent with the measured data which cast a possibility of the deployment of the predictive model developed in this study for the optimal management of water supply facilities.
determination of Optimum Pipe diameter Using Multi-Stage Iterative Method in Water Distribution system
Han, Geon-Yeon ; Park, Jae-Hong ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 327~335
The distribution network is an essential part of all water supply systems. The cost of this portion of any sizable water supply system may amount to most of the entire cost of the project. This study tried to reduce the cost of the distribution system through optimization in system design. To determine pipe diameter considered in water distribution system design, a iterative procedure linked the flow analysis model and optimization model was used. Linear theory was introduced to analyze flowrate and revised-simplex method based on linear programming is used to optimize pipe diameter. This model was applied to wter distribution system with 22 and 35 pipes, and rapidly determine optimized commercial pipe diameters. Keywords : water distribution system, revised simplex method, optimum pipe diameter
Uncertainty Analysis for Dam-Break Floodwave Simulation
Lee, Hong-Rae ; Han, Geon-Yeon ; Jo, Won-Cheol ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 337~345
DAMBRK-U model is developed for the evaluation of overtopping risk of dam and levee and for the estimation of uncertainty in floodwave simulation. The original algorithm is revised and expanded to include Monte-Carlo analysis to estimate them. The model is tested by applying to hypothetical channels of widening, uniform and narrowing geometry. Larger variation in discharge and water depth are expected at narrower sections of a river. It is calibrated by applying to the Hantan River, where severe damages from Yunchun dam-break and levee overtopping occurred on July, 1996. Overtopping risk of dam is calculated for various discharge conditions for Yunchun-dam, and that of levee is also calculated by comparing levee height with flood level at Hantan recreation area. Simulation results show that the overflow depth of flood level is 1,266~0.782 m and the overflow risk turns out to be 100%.
Fluid Flow and Solute Transport in a Discrete Fracture Network Model with Nonlinear Hydromechanical Effect
Jeong, U-Chang ;
Journal of Korea Water Resources Association, volume 31, issue 3, 1998, Pages 347~360
Numerical simulations for fluid flow and solute transport in a fracture rock masses are performed by using a transient flow model, which is based on the three-dimensional stochastic and discrete fracture network model (DFN model) and is coupled hydraulic model with mechanical model. In the numerical simulations of the solute transport, we used to the particle following algorithm which is similar to an advective biased random walk. The purpose of this study is to predict the response of the tracer test between two deep bore holes (GPK1 and GPK2) implanted at Soultz sous Foret in France, in the context of the geothermal researches.l The data sets used are obtained from in situcirculating experiments during 1995. As the result of the transport simulation, the mean transit time for the non reactive particles is about 5 days between two bore holes. Keywords : fracture network, effective normal stress, Mohr-Coulomb criterion, mean transit time