Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korea Water Resources Association
Journal Basic Information
Journal DOI :
Korea Water Resources Association
Editor in Chief :
Volume & Issues
Volume 47, Issue 12 - Dec 2014
Volume 47, Issue 11 - Nov 2014
Volume 47, Issue 10 - Oct 2014
Volume 47, Issue 9 - Sep 2014
Volume 47, Issue 8 - Aug 2014
Volume 47, Issue 7 - Jul 2014
Volume 47, Issue 6 - Jun 2014
Volume 47, Issue 5 - May 2014
Volume 47, Issue 4 - Apr 2014
Volume 47, Issue 3 - Mar 2014
Volume 47, Issue 2 - Feb 2014
Volume 47, Issue 1 - Jan 2014
Selecting the target year
Analysis of Extreme Weather Characteristics Change in the Gangwon Province Using ETCCDI Indices
Kang, Keon Kuk ; Lee, Dong Seop ; Hwang, Seok Hwan ; Kim, Byung Sik ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1107~1119
DOI : 10.3741/JKWRA.2014.47.12.1107
Interesting in abnormal climate is currently growing because of climate change. With this, an increasing number of people continue to show concern over the negative effects of such changes. In Korea, the annual average rainfall amount increased to about 19% from 1,155 mm in the 1910s to 1,375 mm in the 2000s. By the end of the 21st century, it has been projected that rainfall will further increase to about 17%. In particular, the 10-year frequency of localized heavy rain of more than 100-mm rainfall per day reached 385 days in the last 10 years. As such, it increased 1.7 times from 222 in the 1970s-80s. The extreme events caused by climate change is thus reported as having exacerbated over the years. Gangwon-province will suffer more from climate change than any other region in Korea because of its mostly mountainous terrain. It is a special region with both mountainous and oceanic climates divided alongside the eastern and western regions of the Taebaek Mountain Range. As such, this paper try to quantify using ETCCDI (Expert Team on Climate Change Detection and Indices) the recent climate changes in this region.
Sensitivity Analysis and Parameter Evaluation of a Distributed Model for Rainfall-Runoff-Soil Erosion-Sediment Transport Modeling in the Naesung Stream Watershed
Jeong, Won Jun ; Ji, Un ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1121~1134
DOI : 10.3741/JKWRA.2014.47.12.1121
The distributed watershed model of rainfall-runoff-soil erosion-sedimen transport was constructed for the Naesung Stream Watershed with high potentiality and risk of sediments produced by soil erosion. The sensitivity analyses of roughness coefficient and hydraulic conductivity which affected the modeling results of runoff and sediment concentration were performed in this study. As a result, the change of the roughness coefficient for the forest area from 0.4 to 0.45 did not affect the change in runoff and stream discharge and the average value and range of sediment concentration were also insignificantly increased with few difference. As a result of the sensitivity analysis of the hydraulic conductivity, the total amount of runoff and maximum runoff were gradually increased as the hydraulic conductivity was reduced. In the case of sediment concentration modeling, the average and the range of sediment concentration for all stations were increased as the hydraulic conductivity was decreased. For the Hyangseok Station, in case of the hydraulic conductivity reduced by 50%, the simulation result of sediment concentration was most similar to the estimated value by the sediment rating curve.
Evaluation of Pollutant Removal Efficiency through Field Test-Bed Experiment in the Rural Small Stream
Choi, Sun Hwa ; Oh, Jong Min ; Kim, Tae-Hoon ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1135~1143
DOI : 10.3741/JKWRA.2014.47.12.1135
This study was carry out to evaluate of water purification in oxidation pond with filamentous algae mat. It is the water treatment process in the small rural streams to remove the organic materials and nutrients. We used the filamentous algae mat (FAM) which selectively predominate the filamentous algae to prevent the additional contamination by algae outflow, and we conducted a experiment on the water treatment process using the aquatic plants such as Eichhornia crassipes. The removal efficiencies (%) of water quality parameters were SS 80.9%, COD 74.6%, TN 76.8%, TP 84.4%, DTN 93.8% and DTP 98.3%, respectively. Temperature, a effect factor, was
during the operating period, according to temperature had no effect on the removal efficiencies of pollutants. Hydraulic retention time (HRT) strongly correlated with removal efficiencies (%) of SS and TP having r=0.414 (p<0.005), r=0.446 (p<0.005), respectively, and when HRT was 5day had highly removal efficiency (%) in SS and TP. TN and TP removal efficiency increased with ratio decreasing in both COD/TN and COD/TP of Influent.
High-Precision and 3D GIS Matching and Projection Based User-Friendly Radar Display Technique
Jang, Bong-Joo ; Lee, Keon-Haeng ; Lee, Dong-Ryul ; Lim, Sanghun ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1145~1154
DOI : 10.3741/JKWRA.2014.47.12.1145
In recent years, as frequency and intensity of severe weather disasters such as flash flood have been increasing, providing accurate and prompt information to the public is very important and needs of user-friendly monitoring/warning system are growing. This paper introduces a method that re-produces radar observations as multimedia contents and applies reproduced data to mesh-up services. In addition, a accurate GIS matching technique to help to track the exact location going on serious atmospheric phenomena is presented. The proposed method create multimedia contents having structures such as two dimensional images, vector graphics or three dimensional volume data by re-producing various radar variables obtained from a weather radar. After then, the multimedia formatted weather radar data are matched with various detailed raster or vector GIS map platform. Results of simulation test with various scenarios indicate that the display system based on the proposed method can support for users to figure out easily and intuitively routes and degrees of risk of severe weather. We expect that this technique can also help for emergency manager to interpret radar observations properly and to forecast meteorological disasters more effectively.
Complementary Relationship Based Evaportranspiration Estimation Model Suitable for the Hancheon and Kangjeongcheon Watersheds in Jeju Island
Kim, Nam Won ; Nah, Hanna ; Lee, Jeongwoo ; Lee, Jeong Eun ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1155~1163
DOI : 10.3741/JKWRA.2014.47.12.1155
The complementary relationship-based evapotranspiration models, namely, AA model of Brutsaert and Stricker (1979) and the CRAE model of Morton (1983) was applied to two permanent stream watersheds Jeju island for the first time, and their major optimal parameters were suggested in this study. The representative watersheds for model calibration and validation were selected as the Hancheon watershed located in the northern part of the Jeju island and and the Kangjeongcheon watershed in southern Jeju island, respectively. The estimated actual evapotranspiration for the Hancheon watershed was compared with the result by the hydrological model, and the major parameters of the AA and CRAE models were calibrated until their results match the hydrological simulations. Through the iterative estimations, the optimal parameters were determined as
of the AA model, and
of the CRAE model. The calibrated AA and CRAE models were applied to the Kangjeongcheon watershed for model validation, and it was found out that both models can accurately produce the actual evaporation on annual and semiannual bases.
Estimation of Superelevation in Mountainous River Bends
Park, Sang Doeg ; Lee, Seung Kyu ; Shin, Seung Sook ; Cho, Jaewoong ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1165~1176
DOI : 10.3741/JKWRA.2014.47.12.1165
In a river bend the water surface is inclined by the centrifugal force toward the transverse section. If channel slope and flow rate increase, the gradient is rising generally. There are lots of the flood damage at the bends of mountain river because the flood water levels have exceeded frequently the levee levels which are added a free board to the design flood water level. Therefore the superelevation should be considered in designing the mountainous river bend. In present study it was proposed to estimate the superelevation at the bend of mountain river and the superelevation coefficient defined from multiplying the sub-factors. The values of the influence factors for the superelevation coefficient were suggested from analyzing the superelevation measured at the bends in Yangyangnamdae river and the hydraulic experiments in gravel-bed channel with a
bend. The applicability of these methods to estimate the superelevation at the bends in mountain river was verified by the superelevation measured at the bend in Naerin river.
Effect of Corrected Hydrostatic Pressure in Shallow-Water Flow over Large Slope
Hwang, Seung-Yong ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1177~1185
DOI : 10.3741/JKWRA.2014.47.12.1177
This study suggests a new hydrostatic pressure distribution corrected for nonuniform flow over a channel of large slope. For analyzing shallow-water flows over large slope accurately, it is developed a finite-volume model incorporating the pressure distribution to the shallow water equations. Traveling speed of the hydraulic jump downstream a parabolic bump in the drain case is quite reduced by the weakened bottom gradient source term in the model with the pressure correction. In simulating the dam-break flow over a triangular sill, it is identified that the model with pressure correction could capture the water surface by the digital imaging measurements more than the model without that. Due to the pressure correction decreasing the reflected flows on and increasing overflows over the sill, there are good agreements in the experiment and the simulation with that. Therefore, this model is expected to be applied to such practical problems as flows in the spillway of dam or run-up on the beach.
Comparative Assessment of a Method for Extraction of TC-induced Rainfall Affecting the Korean Peninsula
Son, Chan-Young ; Kwon, Hyun-Han ; Kim, Jong-Suk ; Moon, Young-Il ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1187~1198
DOI : 10.3741/JKWRA.2014.47.12.1187
Strong winds and heavy rainfall from tropical cyclones (TCs) that occur in the Northwestern Pacific cause significant human and material damage to the Korean peninsula and East Asia. Hence, it is important to establish early warning systems and conduct preparedness activities in advance of a TC. This study suggests a technique to extract the value of uniform TC-induced rainfall considering the TC track and TC size. To validate our technique, we compare it to existing TC rainfall techniques using the spatial domain. To determine the TC size required for extracting TC-induced rainfall, this research analyzed the mean of TC-induced rainfall by TC size (1973-2012). As a result of this analysis, the maximum amount of mean of TC-induced rainfall was found for a TC with a radius of 700 km. Other techniques have limitations which this new technique addresses; it can extract TC-induced rainfall in each administrative area and minimize systematic biases of other extraction methods. The result of this study can be utilized in the preparation of rainfall forecasts, designing hydraulic structures, and predicting landslide and debris flows using TC-induced rainfall and downpours.
Bivariate Frequency Analysis of Dam Storage Capacity before and after the Rainy Season and Evaluation on Water Supply Capacity
Jun, Changhyun ; Yoo, Chulsang ; Zhu, Ju Hua ; Lee, Gwang-Man ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1199~1212
DOI : 10.3741/JKWRA.2014.47.12.1199
This study proposes an evaluation method of water supply capacity of a dam, which uses the concept of return period by conducting bivariate frequency analysis of dam storage capacity. The proposed method was applied to the Daecheong Dam for the evaluation. Additionally, the return periods of Daecheong Dam were estimated for the representative drought events in Korea, whose results were also reviewed. Summarizing the results is as follows. First, this study evaluated several climatological factors related to the water supply capacity of dams in Korea to conduct the bivariate frequency analysis and selected the storage on May and the storage difference between June and October as variables for analysis. Second, as an evaluation result of the water supply capacity of the Daecheong Dam, it was found that the Daecheong Dam secures the water supply capacity under 20 years of return period. Finally, it was also confirmed that the proposed method in this study is valid to analyze and estimate the return period of representative drought events occurred in the Korean peninsula.
Experimental Study on the Sediment Sorting Processes of the Bed Surface by Geomorphic Changes in the Alluvial Channels with Mixed Grain Size
Jang, Chang-Lae ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1213~1225
DOI : 10.3741/JKWRA.2014.47.12.1213
The development of bars and sediment sorting processes in the braided channels with the mixed grain sizes are investigated experimentally in this study. The sediment in the steep slope channels discharges with highly fluctuation. However, it discharges with relatively periodic cycles in the mild slope channels. The characteristics and amplitudes of the dominant bars are examined by double fourier analysis. The dimensionless sediment particle size decreases as the longitudinal bed elevation increases. However, the size increases as the longitudinal bed elevation decreases. As the dimensionless critical tractive force in the surface layer ratio to the force in the subsurface layer increases, the surface geometric mean size of sediments and the dimensionless sediment particle size decrease. This means that coarse matrix is formed with the dimensionless tractive force by the sediment selective sorting.
Improvement of Rainfall Estimation according to the Calibration Bias of Dual-polarimetric Radar Variables
Kim, Hae-Lim ; Park, Hye-Sook ; Ko, Jeong-Seok ;
Journal of Korea Water Resources Association, volume 47, issue 12, 2014, Pages 1227~1237
DOI : 10.3741/JKWRA.2014.47.12.1227
Dual-polarization can distinguish precipitation type and dual-polarization is provide not only meteorological phenomena in the atmosphere but also non-precipitation echoes. Therefore dual-polarization radar can improve radar estimates of rainfall. However polarimetric measurements by transmitting vertically vibration waves and horizontally vibrating waves simultaneously is contain systematic bias of the radar itself. Thus the calibration bias is necessary to improve quantitative precipitation estimation. In this study, the calibration bias of reflectivity (Z) and differential reflectivity (
) from the Bislsan dual-polarization radar is calculated using the 2-Dimensional Video Disdrometer (2DVD) data. And an improvement in rainfall estimation is investigated by applying derived calibration bias. A total of 33 rainfall cases occurring in Daegu from 2011 to 2012 were selected. As a results, the calibration bias of Z is about -0.3 to 5.5 dB, and
is about -0.1 dB to 0.6 dB. In most cases, the Bislsan radar generally observes Z and
variables lower than the simulated variables. Before and after calibration bias, compared estimated rainfall from the dual-polarization radar with AWS rain gauge in Daegu found that the mean bias has fallen by 1.69 to 1.54 mm/hr, and the RMSE has decreased by 2.54 to 1.73 mm/hr. And estimated rainfall comparing to the surface rain gauge as ground truth, rainfall estimation is improved about 7-61%.