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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 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 Water Cycle at Main Streams in Ulsan Using CAT Model
Lee, Sang Hyeon ; Cho, Hong Je ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 1~10
DOI : 10.3741/JKWRA.2014.47.1.1
This study aimed to analyze water cycle at Taehwa river, Dongcheon, Hoiya river and Cheongryang cheon in Ulsan city using CAT model developed by Korea Institute of construction technology. To apply CAT model, we separated Teahwa river into 25, Dongcheon into 11, Hoiya river into 17 and Cheongryangcheon into 5 subbasins and discriminated between contribution runoff basins and source basins. The results of water cycle analysis performed using rainfall datas measured from 1975 and 2008 and hydrologic datas of change of land use etc. were that surface runoff increase and interflow decrease, caused by the increase of impervious area. The increases of surface runoff at the basin of Taehwa river and Dongcheon which is a tributary of Taehwa river were small and similar to each other respectively as 1.7% and 2.4%, and increased high rate of 3.2% and 7.7% in Hoiya river and Cheongryangcheon including subbasins which are having high rate of urbanization.
A Numerical Study on Propagation Characteristics of Dam-break Wave through a Porous Structure
Jeong, Woochang ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 11~24
DOI : 10.3741/JKWRA.2014.47.1.11
In this study, the characteristics of the propagation of dam-break wave through a porous structure in a water tank is numerically analyzed by using the three-dimensional numerical model (ANSYS CFX model). As results of comparison between the existing measured and simulated water depth distributions in and around a porous structure, the agreement is relatively well satisfied. Moreover, for the case of the presence in part of a porous structure in a water tank, the three-dimensional flow structure is numerically analyzed In general, compared with in the area with a porous structure, the abrupt variation of water depth occurs in the area without a porous structure. It is shown that the porous structure can play a role to decrease the abrupt variation of water depth.
Evaluation of Hydrometeorological Components Simulated by Water and Energy Balance Analysis
Ji, Hee Sook ; Lee, Byong Ju ; Nam, Kyung Yeub ; Lee, Chul Kyu ; Jung, Hyun Sook ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 25~35
DOI : 10.3741/JKWRA.2014.47.1.25
The objective of this study is to evaluate TOPLATS land surface model performance through comparison of results of water and energy balance analysis. The study area is selected Nakdong river basin and high resolution hydrometeorological components of which spatio-temporal resolution is 1 hr and 1 km are simulated during 2003 to 2013. The simulated daily and monthly depth of flows are well fitted with the observed one on Andong and Hapcheon dam basin. In results of diurnally analysis of energy components, change pattern throughout the day of net radiation, latent heat, sensible heat, and ground heat under energy balance analysis have higher accuracy than ones under water balance analysis at C3 and C4 sites. Especially, root mean square errors of net radiation and latent heat at C4 site are shown very low as 22.18
, respectively. Mean soil moisture and evapotranspiration in summer and winter are simulated as 36.80%, 33.08% and 222.40 mm, 59.95 mm, respectively. From this result, when we need high resolution hydrometeorological components, energy balance analysis is more reasonable than water balance analysis. And this results will be used for monitor and forecast of weather disaster like flood and draught using spatial hydrometeorological information.
Numerical Experiments of the Behavior of Bars in the Channels with Periodic Variable Width
Jang, Chang-Lae ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 37~47
DOI : 10.3741/JKWRA.2014.47.1.37
This study examines the processes and the behaviour characteristics of forcing bars in channels with periodic variable width in the alternate and braided regimes by using a two dimensional numerical model. The wavelength and the migration speed decrease as the amplitude of variable width increases. The forcing effects of the width variation on the alternate bars is stronger than those on the braided bars. The bar migration speed increases as the dimensionless amplitude in the braided regime is 0.25. However, the migration speed is abruptly decreased as the amplitude in it was larger than 0.25. The bar migration speed increases in the alternates bar regime as the dimensionless wavelength increases. However, the migration speed decreases around 1 of the wavelength. As the bar wavelength and the variable width wavelength coincide, the bars don`t migrate downstream by the strong forcing effects on the bars due to the suppression by the width variation.
Analysis of Non-point Pollution Source Reduction by Permeable Pavement
Koo, Young Min ; Kim, Young Do ; Park, Jae Hyeon ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 49~62
DOI : 10.3741/JKWRA.2014.47.1.49
As the Urban area grows and more land is developed both within the city and in surrounding areas, hydrologic functions of the natural water cycle are altered. Urbanization creates impervious areas that negatively impact stormwater runoff characteristics. these changes to the natural hydrologic cycle result in the increased flooding, decreased groundwater recharge, increased urban heat island effects. Finally, the land use and other activities result in accumulation and washoff of pollutants from surface, resulting in water quality degradation. Therefore, in this study, evaluating and quantitative analysis of the percolation effect through infiltration experiment of permeable pavement, which is one of the ways that can reduce the problem of the dry stream. Also the SWMM model is used to study the effect of the hydrologic cycle for permeable pavement block contribution.
Hydraulic Habitat Analysis of Benthic Macroinvertebrates at Gapyeong Stream
Kim, Jin Hong ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 63~70
DOI : 10.3741/JKWRA.2014.47.1.63
Hydraulic habitat analysis of Benthic Macroinvertebrates was performed at Gapyeong stream. Among the kinds of the Benthic Macroinvertebrates, the most representative ones are the Ecdyonurus kibunensis from the clingers, Paraleptophlebia cocorata from the swimmers, Chironomidae spp from the burrowers, Psilotreta kisoensis iwata from the sprawlers. They showed different habitat types by the hydraulic conditions such as flow velocity, depth and particle size of riverbed materials. Habitat conditions of swimmers were determined mainly by the flow velocity rather than flow depth or riverbed materials. Burrowers prefer sand and silt, and inhabited at the riverbed. Sprawlers prefer cobble or boulder and inhabited for velocity of 0.05~0.15 m/s. Clingers prefer pebble or cobble and inhabited for velocity of 0.06~0.15 m/s. Although the habitats of each groups are different by the hydraulic properties, they were found to be different mainly by the water velocity.
Projection and Analysis of Drought according to Future Climate and Hydrological Information in Korea
Sohn, Kyung Hwan ; Bae, Deg Hyo ; Ahn, Jae Hyun ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 71~82
DOI : 10.3741/JKWRA.2014.47.1.71
The objective of this study is to project and analyze drought conditions using future climate and hydrology information over South Korea. This study used three Global Climate Models (GCMs) and three hydrological models considering the uncertainty of future scenario. Standardized Precipitation Index (SPI), Standardized Runoff Index (SRI) and Standardized Soil moisture Index (SSI) classified as meteorological, hydrological and agricultural droughts were estimated from the precipitation, runoff and soil moisture. The Mann-Kendall test showed high increase in future drought trend during spring and winter seasons, and the drought frequency of SRI and SSI is expected higher than that of SPI. These results show the high impact of climate change on hydrological and agriculture drought compared to meteorological drought.
Analysis of Intensity-Duration-Quantity (IDQ) Curve for Designing Flood Retention Basin
Kim, Jin Gyeom ; Kang, Boosik ; Yoon, Byungman ;
Journal of Korea Water Resources Association, volume 47, issue 1, 2014, Pages 83~93
DOI : 10.3741/JKWRA.2014.47.1.83
This research was carried out for suggesting design criteria and procedure for maximizing flood control capacity by building flood control facilities like flood retention basin built in connection with existing facilities in order to cope with increased uncertainty due to factors such as urbanization and climate change. We suggested the procedure for the analysis under the various scenarios applicable for the cases of determining retention basin capacity as provision for the flood water level increase in main river channel or estimating flood water level reduction effect when retention basin capacity is given. Procedure for estimating design flood hydrograph at any duration using Intensity-Duration-Quantity (IDQ) originated from the existing IDF, and its application example were provided. Based on rainfall estimated by the IDQ analysis, it is possible to calculate an equivalent peak hydrographs under various scenarios, e.g. lower frequency hydrograph under same rainfall duration with water level higher than existing hydrograph, hydrograph with same peak and higher volume due to increased rainfall duration, hydrograph with higher peak and volume than existing hydrograph, etc.