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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Agricultural Engineers
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Journal DOI :
The Korean Society of Agricultural Engineers
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Volume & Issues
Volume 58, Issue 4 - Jul 2016
Volume 58, Issue 3 - May 2016
Volume 58, Issue 2 - Mar 2016
Volume 58, Issue 1 - Jan 2016
Selecting the target year
Assessment of Ecological Streamflow for Maintaining Good Ecological Water Environment
Jung, Chung-Gil ; Lee, Ji-Wan ; Ahn, So-Ra ; Hwang, Soon-Jin ; Kim, Seong-Joon ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 1~12
DOI : 10.5389/KSAE.2016.58.3.001
The objective of this study is to analyze the relationship between stream water quality of TN (total nitrogen), TP (total phosphorus), and BOD (Biochemical Oxygen Demand) and TDI (Trophic Diatom Index) score determined by physico-chemical factors, biomass, and standing crops of epilithic diatoms, and to estimate the required amount of ecological streamflow for good water environment of Trophic Diatom. For the main stream of Chungju dam watershed of South Korea, total 100 field data of 3 years (2008~2010) measured in May and September were used to derive the relationship between water quality and TDI. Trophic Diatom had high correlation (0.55 determination coefficient) with TN. Using the relationship, the required streamflow was evaluated by using the Soil Water Assessment Tool (SWAT) for good Trophic Diatom water environment through T-N water quality maintenance. The SWAT simulated 8 years (2003~2010) stream discharges and T-N water quality along the main stream. From present garde C (score range: 30.0~45.0) to grade A (score above 60.0) of TDI, the May needs additional streamflow of
(+36.7 % comparing with the present streamflow of
) at the watershed outlet.
Analysis of Indeterminate Truss Structures by Element-Focused Network Approach
Han, Yicheol ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 13~19
DOI : 10.5389/KSAE.2016.58.3.013
Element-focused network analysis method for truss structure is proposed. The propagation process of loads from external loads to connected other elements is similar to that of connections between nodes in accordance with attachment rule in a network. Here nodes indicate elements in a truss structure and edges represent propagated loads. Therefore, the flows of loads in a truss structure can be calculated using the network analysis method, and consequently the structure can also be analyzed. As a first step to analyze a truss structure as a network, we propose a local load transfer rule in accordance with the topology of elements, and then analyze the loads of the truss elements. Application of this method reveal that the internal loads and reactions caused by external loads can be accurately estimated. Consequently, truss structures can be considered as networks and network analysis method can be applied to further complex truss structures.
Engineering Properties of Carbon Fiber and Glass Fiber Reinforced Recycled Polymer Concrete
Noh, Jin Yong ; Sung, Chan Yong ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 21~27
DOI : 10.5389/KSAE.2016.58.3.021
This study was performed to evaluate engineering properties of carbon and glass fiber reinforced recycled polymer concrete. Fiber reinforced recycled polymer concrete were used recycled aggregate as coarse aggregate, natural aggregate as fine aggregate,
as filler, unsaturated polyester resin as binder, and carbon and glass fiber as fibers. The compressive and flexural strength of carbon fiber reinforced recycled polymer concrete were in the range of 68~81.5 MPa and 19.1~21.5 MPa at the curing 7days. Also, the compressive and flexural strength of glass fiber reinforced recycled polymer concrete were in the range of 69.4~85.1 MPa and 19~20.1 MPa at the curing 7days. Abrasion ratio of carbon and glass fiber reinforced recycled polymer concrete were decreased 21.6 % and 11.6 % by fiber content 0.9 %, respectively. After impact resistance test, drop numbers of initial and final fracture were increased with increase of fiber contents. Accordingly, carbon fiber and glass fiber reinforced recycled polymer concrete will greatly improve the hydraulic structures, underground utilities and agricultural structures.
Leaching Behavior of Arsenic and Heavy-Metals and Treatment Effects of Steel Refining Slag in a Reducing Environment of Paddy Soil
Yun, Sung-wook ; Yu, Chan ; Yoon, Yong-Cheol ; Kang, Dong-Hyeon ; Lee, Si-Young ; Son, Jinkwan ; Kim, Dong-Hyeon ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 29~38
DOI : 10.5389/KSAE.2016.58.3.029
There have been only a few studies focused on the stabilization of metal (loid)s in anaerobic soils such as paddy soils. In this study, laboratory-scale column tests were conducted to artificially manipulate anoxic conditions in submerged paddy fields and we observed the release behavior of As, Cd, Pb, and Zn, as well as to examine the stabilization effect of steel refining slag (SRS) on the metal(loid)s. The leachate samples were collected and chemical parameters were monitored during the test period. Results suggest that anoxic conditions were developed during submersion, and that As or heavy metals (particularly Cd) fractions bound to ferrous (Fe) /manganese (Mn) oxides were easily dissociated. Moreover, As is also reduced by itself to a trivalent form with higher mobility in the reducing environment of rice paddy soil. However, it was also shown that SRS significantly decreased the dissolution of Zn, Pb, Cd, and As in the the leachates; their removal rates in the SRS-treated soil were 66 %, 45 %, 24 %, and 84 %, respectively, of those in the control soil.
Stabilization of Heavy Metal (Ni, Cr) in Soil Amended with Biomass Ash
Kang, Ku ; Park, Seong-Jik ; Hong, Seong-Gu ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 39~46
DOI : 10.5389/KSAE.2016.58.3.039
This study investigated the potential use and the effectiveness of biomass ashes for the stabilization of heavy metals in soil through a series of experiments. The ashes used for the experiments were obtained from the gasification of biomass including miscanthus and woodchips. The amounts of nickel and chromium released from the soil and ash mixture were analyzed. Chemical analysis showed that the ash contained unburned carbon as well as silica and alkali metals. Miscanthus ashes have C (83.400 %) > Si (9.040 %) > K (3.180 %) > Ca (1.800 %), and woodchip ashes have C (93.800 %) > Ca (2.220 %) > Fe (1.370 %) > K (1.200 %). KSLT and TCLP test results implied that the heavy metal concentrations were below the environmental standards and would not impose the risks. The results also showed that Ni releases were more limited as more ashes were mixed with the soil due to the increases in exchangeable, carbonate, and oxide nikels. Both miscanthus and woodchip ahses were effective in stabilizing nickel and chromium through mixing with the soil. It could be seen that ashes produced from biomass gasification can be used to stabilize the heavy metals in soils.
Changes in Soil Water Content and Drainage Characteristics with Superabsorbent Polymers Amendment
Yun, Tae-Kang ; Son, Young-Hwan ; Park, Jae-Sung ; Kim, Dong-Geun ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 47~56
DOI : 10.5389/KSAE.2016.58.3.047
Superabsorbent Polymers (SAPs) are hydrophilic synthetic polymers which could absorb water by hundreds of their own weight. They are used for multiple purpose including hygienic goods, soil conditioners, and hospital supplies. It is necessary to investigate the standard of their use including the amendment rate for soil application in agricultural fields. It is also important to understand their effects on the soil water content and engineering characteristics. The objective of this study is to find the water absorbing capacity and reusability of SAPs, and the characteristics of water release and effect of them on soil water content and engineering characteristics. In the result, SAPs per unit weight (1 g) used for this research could absorb about 200 g of water in max. The water absorbing capacity decreased after SAPs were used repeatedly. Released water of SAPs could provide the soils with about 9 % of the soil water content. Soil water content increased with decreasing distance from the SAPs. The distance of release was spreaded out with increasing water absorbed of SAPs. Finally, when a drainage and the capacity of soil water content were considered, it is recommended to amend the SAPs with soil by less than 0.25 %.
Analysis of Extreme Rainfall Distribution Scenarios over the Landslide High Risk Zones in Urban Areas
Yoon, Sunkwon ; Jang, Sangmin ; Rhee, Jinyoung ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 57~69
DOI : 10.5389/KSAE.2016.58.3.057
In this study, we analyzed the extreme rainfall distribution scenarios based on probable rainfall calculation and applying various time distribution models over the landslide high risk zones in urban areas. We used observed rainfall data form total 71 ASOS (Automated Synoptic Observing System) station and AWS (Automatic Weather Station) in KMA (Korea Meteorological Administration), and we analyzed the linear trends for 1-hr and 24-hr annual maximum rainfall series using simple linear regression method, which are identified their increasing trends with slopes of 0.035 and 0.660 during 1961-2014, respectively. The Gumbel distribution was applied to obtain the return period and probability precipitation for each duration. The IDF (Intensity-Duration-Frequency) curves for landslide high risk zones were derived by applying integrated probability precipitation intensity equation. Results from IDF analysis indicate that the probability precipitation varies from 31.4~38.3 % for 1 hr duration, and 33.0~47.9 % for 24 hr duration. It also showed different results for each area. The
Quartile method as well as Mononobe distribution were selected as the rainfall distribution scenarios of landslide high risk zones. The results of this study can be used to provide boundary conditions for slope collapse analysis, to analyze sediment disaster risk, and to use as input data for risk prediction of debris flow.
Hydrologic Modeling for Agricultural Reservoir Watersheds Using the COMFARM
Song, Jung-Hun ; Park, Jihoon ; Kim, Kyeung ; Ryu, Jeong Hoon ; Jun, Sang Min ; Kim, Jin-Taek ; Jang, Taeil ; Song, Inhong ; Kang, Moon Seong ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 71~80
DOI : 10.5389/KSAE.2016.58.3.071
The component-based modeling framework for agricultural water-resources management (COMFARM) is a user-friendly, highly interoperable, lightweight modeling framework that supports the development of watershed-specific domain components. The objective of this study was to evaluate the suitability of the COMFARM for the design and creation of a component-based modeling system of agricultural reservoir watersheds. A case study that focused on a particular modeling system was conducted on a watershed that includes the Daehwa and Dangwol serial irrigation reservoirs. The hydrologic modeling system for the study area was constructed with linkable components, including the modified Tank, an agricultural water supply and drainage model, and a reservoir water balance model. The model parameters were each calibrated for two years, based on observed reservoir water levels. The simulated results were in good agreement with the observed data. In addition, the applicability of the COMFARM was evaluated for regions where reservoir outflows, including not only spillway release but also return flow by irrigation water supply, substantially affect the downstream river discharge. The COMFARM could help to develop effective water-management measures by allowing the construction of a modeling system and evaluation of multiple operational scenarios customized for a specific watershed.
Behavior of Seepage and Seismic for the Deterioration Reservoir Using Numerical Analysis
Park, Sung-Yong ; Chang, Suk-Hyun ; Lim, Hyun-Taek ; Kim, Jung-Meyon ; Kim, Yong-Seong ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 81~90
DOI : 10.5389/KSAE.2016.58.3.081
It is significant to redevelop the deterioration reservoir through raising for countermeasure to climate change and Earthquake improvement of reservoir. This study aims to investigate the behavior of deterioration reservoir with poor-fabricated core subjected to raising water level and earthquake using numerical analysis. From the analysis results, water level raising and earthquakes induce crack and subsidences at the crown and the front side of deterioration reservoir. For the reinforcement of the deterioration reservoir is required appropriate measures method and raised method suitable, drainage and slope protection method judged to be necessary.
Seismic Behavior of Deterioration Reservoir Embankment Using Dynamic Centrifugal Model Tests
Park, Sung-Yong ; Chang, Suk-Hyun ; Lim, Hyun-Taek ; Kim, Jung-Meyon ; Kim, Yong-Seong ;
Journal of The Korean Society of Agricultural Engineers, volume 58, issue 3, 2016, Pages 91~100
DOI : 10.5389/KSAE.2016.58.3.091
Recently, lots of damages have been lost because large magnitude earthquakes were occurred in the world. It has been increased the number of earthquakes in Korea. It needs improvement required for the repair of deteriorated reservoirs, reinforcement and raised reservoir coping with climate change and earthquake. This study aims to investigate the seismic behavior of deterioration reservoir levee using dynamic centrifugal model test. Therefore, two case tests in centrifugal field of 60 g, the result has provided the influence on the acceleration response, displacement, settlement and the pore water pressure of the reservoir with earthquakes. From the results larger displacement and acceleration response at the front side of reservoir embankment with poor-fabricated core in seismic condition may degrade overall stability. Reasonable reinforcement method of the raised reservoir embankment is required for ensuring long-term stability on earthquake.