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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 48, Issue 12 - Dec 2015
Volume 48, Issue 11 - Nov 2015
Volume 48, Issue 10 - Oct 2015
Volume 48, Issue 9 - Sep 2015
Volume 48, Issue 8 - Aug 2015
Volume 48, Issue 7 - Jul 2015
Volume 48, Issue 6 - Jun 2015
Volume 48, Issue 5 - May 2015
Volume 48, Issue 4 - Apr 2015
Volume 48, Issue 3 - Mar 2015
Volume 48, Issue 2 - Feb 2015
Volume 48, Issue 1 - Jan 2015
Selecting the target year
A Study on Rainfall-Runoff Frequency Analysis for Estimating Design Flood
Choi, Jongin ; Ji, Jungwon ; Yi, Jaeeung ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 605~612
DOI : 10.3741/JKWRA.2015.48.8.605
The purpose of this study is to compare and analyze design flood estimation methods which are the basis for determining the size of a flood control structure. The result from a flood frequency analysis which is considered as the best way for estimating design flood was assumed as a true value, and a method of simulating runoff and performing frequency analysis of the maximum discharge data were compared with a design storm method. For a comparative analysis of design flood estimation, seven basins (Namgang reservoir basin, Soyanggang reservoir basin, Andong reservoir basin, Seomjingang reservoir basin, Imha reservoir basin, Chungju reservoir basin, Hapcheon reservoir basin) were selected. For the Seomjingang, Hapcheon, and Imha reservoir basins, the method proposed in this study showed better results, whereas the conventional method showed better results for the Namgang, Soyanggang, and Chungju reservoir basins. The results show that the conventional method (the design storm method) is not the best way for estimating design flood and the proposed method can be used as an alternative for small basins.
Development of High-performance Microwave Water Surface Current Meter for General Use to Extend the Applicable Velocity Range of Microwave Water Surface Current Meter on River Discharge Measurements
Kim, Youngsung ; Won, Nam-Il ; Noh, Joonwoo ; Park, Won-Cheol ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 613~623
DOI : 10.3741/JKWRA.2015.48.8.613
To overcome the difficulties of discharge measurements during flood season, MWSCM(micowave water surface current meter) which measures river surface velocities without contacting water has been applied in field work since its development. The existing version of MWSCM is for floods so that its applicability is low due to the short periods of floods. Therefore the renovative redesign of MWSCM to increase the applicability was conducted so that it can be applied to the discharge measurements during normal flows as well as flood ones by extending the measurable range of velocity. A newly developed high-performance MWSCM for general use can measure the velocity range of 0.03-20.0 m/s from flood flows to normal flows, whereas MWSCM for floods can measure the velocity range of 0.5-10.0 m/s. The improvement of antenna isolation between transmitter and receiver to block the inflow of transmitted singals to receiver and the improvement of phase noise of oscillator are necessary for detecting low velocity with MWSCM technology. Separate type antenna of transmitting and receiving signals is developed for isolation enhancement and phase locked loop synthesizer as an oscillator is applied to high-performance MWSCM for general use. Microwave frequency of 24 GHz is applied to the new MWSCM rather than 10 GHz to make the new MWSCM small and light for convenient use of it at fields. Improvement requests on MWSCM for floods-stable velocity measurement, self test, low power consumtion, and waterproof and dampproof-from the users of it has been reflected on the development of the new version of MWSCM.
An Analysis on the Characteristics of Separation Zone Due to a Bed Discordance at Confluence
Choi, Heung Sik ; Mo, Sun Jea ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 625~634
DOI : 10.3741/JKWRA.2015.48.8.625
The diverse patterns of separation zone according to the marked bed discordance by dredging at confluence in addition to the confluence angle of tributary and discharge ratio between tributary and main channels have been analyzed by CCHE2D model simulation. The separation zone is defined by inside of zero velocity boundary at down-stream of confluence. The separation zone dose not formed at the
of confluence angle of tributary. The size of separation zone increases as the discharge ratio and confluence angle increase in general. The separation zone decreases as the dredging depth increases which shows the relative momentum reduction compared by the flow volume increasing by dredging at confluence. The contraction factor with the variation of confluence angle and discharge ratio has been investigated and confirmed the corresponding conveyance decreasing results in backwater effect. The regression equation of shape factor with confluence angle and discharge and dredging depth ratios has been suggested.
An Experimental Study on the Effect of a Hydraulic Structure on the Three-dimensional Flow in a Meandering Channel
Lee, Dong Hun ; Kim, Su Jin ; Kang, Seokkoo ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 635~645
DOI : 10.3741/JKWRA.2015.48.8.635
The objective of this study is to examine the three-dimensional turbulent flows occurring in the meandering channel with presence of a groyne. A series of laboratory experiments are carried out in a meandering channel with trapezoidal cross sections. The channel is a 24.4 m long, 1.5 m wide, and the bottom slope in the longitudinal direction is 0.02. Two cases with and without the groyne are considered in the experiment. Three-dimensional velocity fields are measured using an acoustic Doppler velocimetry (ADV) at approximately sixty locations in each cross section. The measured velocity fields are averaged in time, and the time-averaged flow revealed that the mean velocity magnitude along the outer bank of the channel was reduced significantly and the direction of the primary flow was directed toward the center of the channel due to the presence of the groyne.
Parameteric Assessment of Water Use Vulnerability of South Korea using SWAT model and TOPSIS
Won, Kwyang Jai ; Sung, Jang Hyun ; Chung, Eun-Sung ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 647~657
DOI : 10.3741/JKWRA.2015.48.8.647
This study assessed the water use vulnerability for 12 basins of South Korea. The annual runoff of 12 basins are derived using a Soil and Water Assessment Tool (SWAT) and the calculated runoff per unit area and population are compared with each basin. The 18 indicators are selected in order to assess the vulnerability. Those are classified by aspects of demand, loss and supply of water use. Their weighting values used Entropy method to determine objective weights. To quantitatively assess the water use vulnerability, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) based on multi-criteria decision making are applied. The results show that the water availability vulnerability of Hyeongsan River has the highest value followed by Sapgyo River; Dongjin River; Seomjin River; Anseong River; Mangyung River; Nakdong River; Tamjin River; Youngsan River, Geum River; Taehwa River; and Han River. The result of this study has a capability to provide references for the index deveopment of climate change vulnerability assessment.
A Test of a Far Infrared Camera for Development of New Surface Image Velocimeter for Day and Night Measurement
Yu, Kwonkyu ; Kim, Seojun ; Yoo, Byeongnam ; Bae, Inhyuk ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 659~672
DOI : 10.3741/JKWRA.2015.48.8.659
In flow velocity measurement of natural rivers, taking images with proper image quality is the fundamental and the most important step. Since flood peaks generally occur in night time, it is very difficult to capture proper images in that time. The present study aims to test a far infra-red camera as a adequate alternative to resolve the various problems in measuring flood discharges. The far infra-red cameras are able to capture images in night time without help of any extra illuminations. Futhermore they are not affected by fog nor smoke, hence they can be adapted for a fixed-type surface image velocimeters. For comparison, a commercial camcorder and a near infra-red cameras were used together. The test images were taken at a day time and a night time, and the image acquisition work were performed at an artificial flow channel of the Andong River Experiment Station. The analyzed results showed that the far infra-red camera would be a good instrument for surface image velocimeters, since they were able to capture regardless light condition. There are, however, a few minor problems in their accuracy of the analyzed results. About their accuracy a more study would be required.
Determine the Length of the Side-Weir of Side-Weir Detention Basin Considering the Uncertainty of the Water Level in River
Kim, Seojun ; Kim, Sanghyuk ; Yoon, Byungman ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 673~683
DOI : 10.3741/JKWRA.2015.48.8.673
The existing flood protection in rivers has shown the limitation due to the urbanization around rivers and the abnormal climate. Thus, the demand for the constructions of side-weir detention basin are being increased as a part of integrated watershed flood protection plan. It is necessary to estimate the quantitative flood-control effect for including the side-weir detention basin in flood-control measures. For the determination, it is required to reduce the uncertainty of the design factors which can affect the flood-control effect of side-weir detention basin. Among the factors, however, the water level in river always contains uncertainty. Therefore, the design method considering the uncertainty is required. For the reasons, the design method considering uncertainty of the water level in river is suggested in this study with using the length of side-weir which is relatively easy-determinable by designers. Therefore, it is examined how the variation of the length of side-weir can affect the flood-control effect, using HEC-RAS, and then the method to determine the side-weir length considering the uncertainty of the water level in river through results from analyses. Since the uncertainty of the water level in river can be taken into account in the suggested design method, it is evaluated that the design method is more effective to suggest the flood-control effect of the side-weir type detention basin with higher safety side.
Deriving Channel Width-discharge Relationship from Remote Sensing Imagery and Digital Elevation Models
Kim, Jong Chun ; Paik, Kyungrock ;
Journal of Korea Water Resources Association, volume 48, issue 8, 2015, Pages 685~693
DOI : 10.3741/JKWRA.2015.48.8.685
We propose a method for deriving the relationship between channel width and discharge from remote sensing products. Stream widths at points distributed along a river network can be measured from high-resolution remote imagery. Further, corresponding drainage area for these points can be calculated using digital elevation models, making it possible to construct width-drainage area relation. On the other hand, the relationship between the flow discharge and the drainage area is obtained from historical data measured at ground stations. By coupling these two relationships, we can finally derive the width-discharge relationship which comprises an important component of downstream hydraulic geometry. The proposed method was tested for the Nakdong River and the Seomjin River, successfully capturing power-law exponents in the width-discharge relationships reported in earlier studies. The proposed approach can serve as an alternative for obtaining the hydraulic geometry relationship under the limits of ground data.