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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
Estimation of Optimal Slit Length of Perforated Wall below Still Water Level: Single Chamber Condition
Kim, Young Taek ; Lee, Jong In ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 327~334
DOI : 10.3741/JKWRA.2013.46.4.327
In this study, the optimal slit length of perforated wall with single chamber below the still water level (SWL) is studied through the two dimensional test. The relationship between the reflection coefficient and the shape of structures such as chamber width(B) and slit length(S) are investigated by applying the various wave conditions. The random waves were used for the test by using Bretschneider-Mitsuyasu frequency spectrum. Minimum reflection coefficient is obtained at
condition, this result is different from the regular wave condition. Also the minimum reflection coefficients are measured at
. This means that the optimal slit length below the still water level is 2.5 times of the incident wave height.
The Study on the Satisfaction Factors of the Support Projects for the Adjacent Residents to Multipurpose Dams
Kim, Shang Moon ; Lee, Byungchul ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 335~343
DOI : 10.3741/JKWRA.2013.46.4.335
Multi-purpose dams are regarded to contribute to the Korean society not only positive affects but also negative ones. Especially, negative considerations are usually prevailed around multi-purpose dam sites and their vicinities even though the Government adopted "act on dam construction and assistance, etc. to neighborhood area" in 1989 and has supported many various projects since 1990. Nevertheless, many arguments and controversies about effects of multi-purpose dams and support projects to vicinities" have happened so frequently and sometimes brought a suit against government. These situations imply that support projects are not so sufficient to fulfil peoples' expectations. Therefore, this research figured out the key factors that affected residents' satisfaction about multi-purpose dams and support projects. The results of the research are as follows: 1) 'social necessity of dams', 'rationality of the process in supporting project' and 'appropriateness of supporting project', were statistically significant to 'customer satisfaction'; 2) among these factors, 'rationality of the process in supporting project' was the most related to 'customer satisfaction': 3) 'appropriateness of supporting project', 'social necessity of dams' were also revealed as second third factors that relate to the satisfaction.
A Study to Improve the Spatial Data Design of Korean Reach File to Support TMDL Works
Lee, Chol Young ; Kim, Kye Hyun ; Park, Yong Gil ; Lee, Hyuk ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 345~359
DOI : 10.3741/JKWRA.2013.46.4.345
In order to manage water quality efficiently and systematically through TMDL (Total Maximum Daily Load), the demand for the construction of spatial data for stream networks has increased for use with GIS-based water quality modeling, data management and spatial analysis. The objective of this study was to present an improved KRF (Korean Reach File) design as framework data for domestic stream networks to be used for various purposes in relation to the TMDL. In order to achieve this goal, the US EPA's RF (River Reach File) was initially reviewed. The improved design of the graphic and attribute data for the KRF based on the design of the EPA's RF was presented. To verify the results, the KRF was created for the Han River Basin. In total, 2,047 stream reaches were divided and the relevant nodes were generated at 2,048 points in the study area. The unique identifiers for each spatial object were input into the KRF without redundancy. This approach can serve as a means of linking the KRF with related database. Also, the enhanced topological information was included as attributes of the KRF. Therefore, the KRF can be used in conjunction with various types of network analysis. The utilization of KRF for water quality modeling, data management and spatial analysis as they pertain to the applicability of the TMDL should be conducted.
Analysis on the Characteristics about Representative Temporal-distribution of Rainfall in the Annual Maximum Independent Rainfall Events at Seoul using Beta Distribution
Jun, Chang Hyun ; Yoo, Chulsang ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 361~372
DOI : 10.3741/JKWRA.2013.46.4.361
This study used the beta distribution to analyze the independent annual maximum rainfall events from 1961 to 2010 and decided the representative rainfall event for Seoul. In detail, the annual maximum rainfall events were divided into two groups, the upper 50% and the lower 50%. For each group, a beta distribution was derived to pass the mean location of the rainfall peaks. Finally, the representative rainfall event was decided as the rainfall histogram of the arithmetic average of the two beta distributions derived. The representative rainfall event derived has a realistic shape very similar to those observed annual maximum rainfall events, especially with the higher rainfall peak compared to that of the Huff distribution. Comparison with other rainfall distribution models shows that the temporal distribution of the representative rainfall event derived in this study is most similar to the Keifer & Chu model.
A Study on the Fundamental Comparison of Simulation and Optimization Approaches for Water Resources Systems Planning and Management
Kong, Jeong-Taek ; Kim, Jaehee ; Kim, Sheung-Kown ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 373~387
DOI : 10.3741/JKWRA.2013.46.4.373
For the efficient operation and management of the water resources system, coordinated operation of weirs and reservoirs is required. A simulation based, and an optimization based approaches are available to deal with the operation and management problems. The simulation based approach does not guarantee an optimal solution, and the optimization based approach is not so flexible to consider, complex, nonlinear problems we will face when trying to allocate water to different uses, various demand sectors in a basin. Hence, it is important to develop a model that would compensate for the weak points in both models. We will compare and contrast intrinsic and extrinsic properties of two modeling approaches, addressing issues related to setting system operation and control rules that would lead us to more efficient use of water in the basin. As a result, we propose to use CoWMOM(Coordinated weirs and multi-reservoir operating model), a "simulation based" optimization model for a simple simulation of the past periods, and for the real-time simulation process considering uncertain inflow.
Application of Levenberg Marquardt Method for Calibration of Unsteady Friction Model for a Pipeline System
Park, Jo Eun ; Kim, Sang Hyun ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 389~400
DOI : 10.3741/JKWRA.2013.46.4.389
In this study, a conventional pipeline unsteady friction model has been integrated into Levenberg Marquardt method to calibrate friction coefficient in a pipeline system. The method of characteristics has been employed as the modeling platform for the frequency dependant model of unsteady friction. In order to obtain Hessian and Jacobian matrix for optimization, the direct differentiation of pressure to friction factor was calculated and sensitivities to friction for heads and discharges were formulated for implementation to the integration constant in the characteristic method. Using a hypothetical simple pipeline system, time series of pressure, introduced by a sudden valve closure, were obtained for various Reynolds numbers. Convergency in fiction factors were evaluated both in steady and unsteady friction models. The comparison of calibration performance between the proposed method and genetic algorithm indicates that faster and stabler behaviour of Levenberg Marquardt method than those of evolutionary calibration.
Development of Water Footprint Inventory Using Input-Output Analysis
Kim, Young Deuk ; Lee, Sang Hyun ; Ono, Yuya ; Lee, Sung Hee ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 401~412
DOI : 10.3741/JKWRA.2013.46.4.401
Water footprint of a product and service is the volume of freshwater used to produce the product, measured in the life cycle or over the full supply chain. Since water footprint assessment helps us to understand how human activities and products relate to water scarcity and pollution, it can contribute to seek a sustainable way of water use in the consumption perspective. For the introduction of WFP scheme, it is indispensable to construct water inventory/accounting for the assessment, but there is no database in Korea to cover all industry sectors. Therefore, the aim of the study is to develop water footprint inventory within a nation at 403 industrial sectors using Input-Output Analysis. Water uses in the agricultural sector account for 79% of total water, and industrial sector have higher indirect water at most sectors, which is accounting for 82%. Most of the crop water is consumptive and direct water except rice. The greatest water use in the agricultural sectors is in rice paddy followed by aquaculture and fruit production, but the greatest water use intensity was not in the rice. The greatest water use intensity was 103,263
/million KRW for other inedible crop production, which was attributed to the low economic value of the product with great water consumption in the cultivation. The next was timber tract followed by iron ores, raw timber, aquaculture, water supply and miscellaneous cereals like corn and other edible crops in terms of total water use intensity. In holistic view, water management considering indirect water in the industrial sector, i.e. supply chain management in the whole life cycle, is important to increase water use efficiency, since more than 56% of total water was indirect water by humanity. It is expected that the water use intensity data can be used for a water inventory to estimate water footprint of a product for the introduction of water footprint scheme in Korea.
A Study on Water Quality Modeling for Autochthonous BOD Effect in Namgang Dam Downstream
Hwang, Soo Deok ; Lee, Sung Jun ; Kim, Young Do ; Kwon, Jae Hyun ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 413~424
DOI : 10.3741/JKWRA.2013.46.4.413
The TMDL, the watershed-oriented water quality management policy, was introduced to inhibit the total amount of pollutant loading generation, and to develop the region environmentally friendly. However, despite the implementation of TMDL, the water quality of Nam river downstream has worsened continuously since 2005. Diverse pollution sources such as cities and industrial zone are scattered around the Nam river. Eutrophication are caused due to deterioration of water quality by low velocity. BOD concentrations in the eutrophic waters affected by the incoming BOD and the autochthonous BOD by the production of phytoplankton. In this study, the quantitative relation of incoming BOD and autochthonous BOD was analyzed for water quality management. The influence of autochthonous BOD was analyzed using QUALKO2 and QUAL2E. Considering the effects of Chl.a, BOD concentration from QUALKO2 model simulations is higher than BOD concentration from QUAL2E model. The results of QUALKO2 showed higher correlation with the measured data. Autochthonous BOD needs to be managed to solve the water pollution problem of Nam river downstream, which is looking for ways to reduce Chl.a by using the increase of the dam outflow and the improvement of the water quality from WWTP.
Drought Risk Analysis Using Stochastic Rainfall Generation Model and Copula Functions
Yoo, Ji Young ; Shin, Ji Yae ; Kim, Dongkyun ; Kim, Tae-Woong ;
Journal of Korea Water Resources Association, volume 46, issue 4, 2013, Pages 425~437
DOI : 10.3741/JKWRA.2013.46.4.425
This study performed the bivariate drought frequency analysis for duration and severity of drought, using copula functions which allow considering the correlation structure of joint features of drought. We suggested the confidence intervals of duration-severity-frequency (DSF) curves for the given drought duration using stochastic scheme of monthly rainfall generation for 57 sites in Korea. This study also investigated drought risk via illustrating the largest drought events on record over 50 and 100 consecutive years. It appears that drought risks are much higher in some parts of the Nakdong River basin, southern and east coastal areas. However, such analyses are not always reliable, especially when the frequency analysis is performed based on the data observed over relatively short period of time. To quantify the uncertainty of drought frequency curves, the droughts were filtered by different durations. The 5%, 25%, 50%, 75%, and 95% confidence intervals of the drought severity for a given duration were estimated based on the simulated rainfall time series. Finally, it is shown that the growing uncertainties is revealed in the estimation of the joint probability using the two marginal distributions since the correlation coefficient of two variables is relatively low.