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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 46, Issue 12 - Dec 2013
Volume 46, Issue 11 - Nov 2013
Volume 46, Issue 10 - Oct 2013
Volume 46, Issue 9 - Sep 2013
Volume 46, Issue 8 - Aug 2013
Volume 46, Issue 7 - Jul 2013
Volume 46, Issue 6 - Jun 2013
Volume 46, Issue 5 - May 2013
Volume 46, Issue 4 - Apr 2013
Volume 46, Issue 3 - Mar 2013
Volume 46, Issue 2 - Feb 2013
Volume 46, Issue 1 - Jan 2013
Selecting the target year
Power Test of Trend Analysis using Simulation Experiment
Ryu, Yongjun ; Shin, Hongjoon ; Kim, Sooyoung ; Heo, Jun-Haeng ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 219~227
DOI : 10.3741/JKWRA.2013.46.3.219
Time series data including change, jump, trend and periodicity generally have nonstationarity. Especially, various methods have been proposed to identify the trend about hydrological time series data. However, among various methods, evaluation about capability of each trend test has not been done a lot. Even for the same data, each method may show the different result. In this study, the simulation was performed for identification about the changes in trend analysis according to the statistical characteristics and the capability in the trend analysis. For this purpose, power test for the trend analysis is conducted using Men-Kendall test, Hotelling-Pabst test, t test and Sen test according to the slope, sample size, standard deviation and significance level. As a result, t test has higher statistical power than the others, while Mann-Kendall, Hotelling-Pabst, and Sen tests were similar results.
GCMs-Driven Snow Depth and Hydrological Simulation for 2018 Pyeongchang Winter Olympics
Kim, Jung Jin ; Ryu, Jae Hyeon ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 229~243
DOI : 10.3741/JKWRA.2013.46.3.229
Hydrological simulation Program-Fortran (HSPF) model was used to simulate streamflow and snow depth at Pyengchang watershed. The selected Global Climate Models (GCMs) provided by the Coupled Model Intercomparision Project Phase 3 (CMIP3) were utilized to evaluate streamflow and snow depth driven by future climate scenarios, including A1, A1B, and B1. Bias-correlation and temporal downscaling processes have been performed to minimize systematic errors between GCMs and HSPF. Based on simulated monthly streamflow and snow depth after calibration, the results indicate that HSPF performs well. The correlation coefficient between the observed and simulated monthly streamflow is 0.94. Snow depth simulations also show high correlation coefficient, which is 0.91. The results indicate that snow depth in 2018 at Pyongchang winter olympic venues will decrease by 17.62%, 9.38%, and 7.25% in January, February, and March respectively, based on streamflow realizations induced by all GCMs ensembles.
The Calculation of Reflection Coefficients of Water Waves over Various Shear Currents with a Uniform Depth Topography
Lee, Jun-Whan ; Cho, Yong-Sik ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 245~252
DOI : 10.3741/JKWRA.2013.46.3.245
The reflection coefficients of monochromatic water waves over various shear currents flowing on a constant topography are estimated analytically in this study. The region of varying shear currents is represented by a finite number of tiny steps with a uniform depth topography. The proper numbers of steps and evanescent modes needed for the analysis are proposed by a series of convergence tests. The characteristics of reflection coefficients for various shear currents conditions are also examined.
Future Projections of Köppen Climate Shifts in the Asia Regions Using A2 Scenario
Shin, Sang Hoon ; Bae, Deg Hyo ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 253~265
DOI : 10.3741/JKWRA.2013.46.3.253
The objective of this study is to analyse the current climate zone applied by K
ppen climate classification and the future climate zone projected by the A2 scenario in Asia regions. The spatial and temporal variations of precipitation and temperature were also analyzed. As regards to the result of analysis on the variation of climate factor, temperature and precipitation will be increasing
and 12% respectively in the 2080s comparing with the reference period (1991~2010). Spatially, the range of temperature increase on the high latitude area is higher than that on the low latitude area. The precipitation will be increasing averagely in the overall area, but the spatial unequal distribution of precipitation will be intensified. At the result of the future climate zone, the area of warm climates will be increasing while the area of cold climates will be decreasing. In 2080s, the temperature will be increasing as much as 7.2% and 1.9% on the Tropical climates and Arid climates respectively, but it will be decreasing as -2.4%, -4.9% and -1.8% on the Warm temperate climates, Cold climates and Polar climates respectively. Furthermore, the part of Savannah climates and Desert climates will be mostly increasing. It is mainly caused by the temperature increase and desertification impact according to global warming.
Optimization of Channel Structure for Fish Habitat Suitability Enhancement
Choi, Heung Sik ; Kim, Sang Mun ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 267~276
DOI : 10.3741/JKWRA.2013.46.3.267
An Improvement of channel structure for sound fish habitat suitability enhancement is investigated. The restoration target species of Zacco Koreanus which is represented a sound aquatic ecosystem is selected by investigating results of the fish fauna and the river environments. The changes of lower channel width for enhancing suitability indices for water velocity and depth result in habitat suitability enhancement in general by PHABSIM simulation. The habitat suitability enhancement is not guaranteed consistently by the changes of lower channel is confirmed. The optimal lower channel widths at each reach are presented by genetic algorithm of optimization which is considering the enhancement of suitability indices for water velocity and depth with given instream flows. The suggested plan of the lower channel modification will contribute to the various projects for the environmental improvement of aquatic system.
The Effects of GyeongIn Ara Waterway on the Regional Property Value
Lee, Hee-Chan ; Cha, Joo-Young ; Park, Doo-Ho ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 277~285
DOI : 10.3741/JKWRA.2013.46.3.277
The purpose of this research is to evaluate the scenic value of the Gyungin Ara waterway in real estate prices. Apart from the multi-functionality such as transportation of passengers and freight, prevention of floods, and provision of leisure areas, the Ara waterway possesses a scenic function which offers people esthetic value through unique and beautiful scenery. This scenic function is an externality for apartment residents living nearby. The applied methodology for this research is the Hedonic Price Model (HPM) which creates a cause and effect model between real estate prices and attributes. Variables such as apartment sale prices, complex characteristics, location characteristics, timely characteristics have been deduced through data collected from a total of 4,207 households that have experienced actual transactions during the same period, all located within the scenic benefit boundaries of the waterway. Landscape variable has been derived from algorithm designed by a combination of digital map and Google Mapview. The scenic value of the waterway estimated through the application of HPM on these variables is 165,000 Won per area (pyeong). The regional asset enhancing effect caused by the landscape view of the waterway is estimated to be 89.1 billion won.
Derivation & Evaluation of Drought Threshold Level Considering Hydro-meteorological Data on South Korea
Bae, Deg Hyo ; Son, Kyung Hwan ; Kim, Heon Ae ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 287~299
DOI : 10.3741/JKWRA.2013.46.3.287
The objective of this study is to derive and evaluate the drought threshold level based on hydro-meteorological data using historical drought events. After collecting the drought events during 1991 to 2009 year, the observed meteorological data and estimated hydrological component from LSM are used as input for the percentile analysis that is drought analysis data. The drought threshold level that precipitation and runoff of 3 month duration are less than 35%, soil moisture of 2 month duration is less than 35% and evapotranspiration of 3 month duration is more than 65% is derived using ROC analysis that are objective test method. ROC analysis with SPI (3) is performed to evaluate the applicability of threshold level in the domestic. As a result, it can be concluded that the derived drought threshold level show better performance to reflect the historical drought events than SPI (3) and it reasonably explain the spatial drought situation through the spatial analysis.
Net Radiation Estimation Using Flux Tower Data and Integrated Hydrological Model: For the Seolmacheon and Chungmichen Watersheds
Kim, Daeun ; Baek, JongJin ; Jung, Sung-Won ; Choi, Minha ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 301~314
DOI : 10.3741/JKWRA.2013.46.3.301
Spatial heterogeneous characteristics of solar radiation energy from Climate Change gives rise to energy imbalance in the general ecological system including water resources. To understand energy flow, flux towers are up and running throughout the world. In step with, in domestic major areas, there have been observed using several flux towers. In this study, downward shortwave radiation, downward long wave radiation, and net radiation that take important part in hydro-meteorology and ecology were calculated by proposed physical equations using flux data of the Seolmacheon and Choengmicheon, then, the calculated net radiation and observed net radiation were individually compared and validated. The results confirmed applicability of physical methods for insufficient hydro-meteorological data and possibility for observed data of hydro-meteorological variables.
Identification of Uncertainty on the Reduction of Dead Storage in Soyang Dam Using Bayesian Stochastic Reliability Analysis
Lee, Cheol-Eung ; Kim, Sang Ug ;
Journal of Korea Water Resources Association, volume 46, issue 3, 2013, Pages 315~326
DOI : 10.3741/JKWRA.2013.46.3.315
Despite of the importance on the maintenance of a reservoir storage, relatively few studies have addressed the stochastic reliability analysis including uncertainty on the decrease of the reservoir storage by the sedimentation. Therefore, the stochastic gamma process under the reliability framework is developed and applied to estimate the reduction of the Soyang Dam reservoir storage in this paper. Especially, in the estimation of parameters of the stochastic gamma process, the Bayesian MCMC scheme using informative prior distribution is used to incorporate a wide variety of information related with the sedimentation. The results show that the selected informative prior distribution is reasonable because the uncertainty of the posterior distribution is reduced considerably compared to that of the prior distribution. Also, the range of the expected life time of the dead storage in Soyang Dam reservoir including uncertainty is estimated from 119.3 years to 183.5 years at 5% significance level. Finally, it is suggested that the improvement of the assessment strategy in this study can provide the valuable information to the decision makers who are in charge of the maintenance of a reservoir.