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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 56, Issue 6 - Nov 2014
Volume 56, Issue 5 - Sep 2014
Volume 56, Issue 4 - Jul 2014
Volume 56, Issue 3 - May 2014
Volume 56, Issue 2 - Mar 2014
Volume 56, Issue 1 - Jan 2014
Selecting the target year
Estimation of Amounts of Water Release from Reservoirs Considering Customary Irrigation Water Management Practices in Paddy-Field Districts
Kang, Min Goo ; Oh, Seung Tae ; Kim, Jin Taek ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 1~9
DOI : 10.5389/KSAE.2014.56.5.001
The DIROM (Daily Irrigation Reservoir Operation Model) was modified to estimate amounts of water release from reservoirs, considering customary irrigation water management practices, such as water supply for puddling and transplanting paddy rice from seeding beds and mid-season drainage. The applicability of the modified model was investigated by simulating amounts of water release from three study reservoirs: Hwamae, Ogi, and Doya Reservoirs. In terms of annual amounts of water release, the relative errors between the observed and simulated values in 2012 and 2013 ranged -26.20 % to 10.28 % and 4.90 % to 30.06 %, respectively; in case of reservoir water levels, the RMSE values ranged 0.45 m to 1.34 m and 0.40 m to 1.27 m, respectively. Also, it was revealed that the model provided better simulation results for monthly water releases than the original model. In addition, the model presented better performance in simulating 10-day amounts of water release from April to June. However, the model had still significant errors in the simulation results from July to September because the reservoirs were practically operated to adapt to water management circumstances. Finally, it is concluded that the modified DIROM can estimate the amounts of water release from reservoirs, reflecting irrigation water management customs in paddy-field districts. To achieve higher prediction accuracy of the model, it is necessary to incorporate practical reservoir operation rules into the model.
Nutrient Balance in the Paddy Fields Watershed with a Source of River Water
Lee, Jeong Beom ; Lee, Jae Yong ; Li, Si Hong ; Jang, Jeong Ryeol ; Jang, Ik Geun ; Kim, Jin Soo ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 11~19
DOI : 10.5389/KSAE.2014.56.5.011
The objective of this research was to investigate concentration and load of nutrients such as total nitrogen (TN), nitrate nitrogen (
-N) total phosphorous (TP), and phosphate phosphorous (
-P) in a 23.4-ha paddy fields watershed with river water source. Water samples for irrigation water, drainage water, ponded water and groundwater were collected, and irrigation and drainage water were measured at 5~10 day intervals during normal days and at 2~6 hours intervals during three storm events. The amount of irrigation water in the study area was over 2,000 mm, which is almost identical to that in the area irrigated from a large reservoir but much more than that in the area irrigated from a pumping station. Mean flow-weighted concentrations of TN and TP in irrigation water were 2.8 and 0.15 mg/L, respectively, higher than those in the area irrigated from a large reservoir or a pumping station. The ratios of irrigation load to total inflow load for TN and TP were 88 %, and the ratios of surface outflow load to total outflow load for TN and TP were over 90 %, indicating that total nutrient load may be greatly affected by water management. The nutrient loads per area in the study area were estimated as TN 21.1 kg/ha and TP 1.1 kg/ha. Especially, the TP load per area in the study area was smaller than that in the area irrigated from a large reservoir or a pumping station. This may be because outflow load is not high likely due to sedimentation of particulate P and irrigation water load is high due to high TP concentration in irrigation water and high amount of irrigation water.
Simulation of the Best Management Practice Impacts on Nonpoint Source Pollutant Reduction in Agricultural Area using STEPL WEB Model
Park, Youn Shik ; Kum, Dong Hyuk ; Jung, Young Hun ; Cho, Ja Pil ; Lim, Kyoung Jae ; Kim, Ki Sung ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 21~27
DOI : 10.5389/KSAE.2014.56.5.021
Sediment-laden water is problematic in aquatic ecosystem and for hydraulic structures in a watershed, and agriculture area in a watershed is one of source areas of nonpoint source (NPS), since soil surface typically exposures due to agricultural activities. Especially, severe sediment might flow into stream when agricultural area is located near stream like the Imha-dam watershed. Soil erosion is affected by precipitation, therefore there is a need to consider precipitation characteristics in soil erosion and best management practices (BMPs) simulation. The Web-based Spreadsheet Tool for the Estimation of Pollutant Load (STEPL WEB) allows estimating long-term sediment loads and the impact of best management practices to reduce sediment loads. STEPL WEB and predicted precipitation data by MIROC-ESM model was used to estimate sediment loads and its reduction by filter strip and conversion of agricultural area to forest in the future 30 years. The result indicates that approximately 70 % of agricultural area requires filter strip installation or that approximately 50 % of agricultural area needs to be converted to forest, for 41 % of sediment load reduction.
Development of GASS2 through Improving Inter-component Connection and Communication Modules
Kim, Tae Gon ; Lee, Sung Yong ; Yi, Ho Jae ; Lee, Jeong Jae ; Suh, Kyo ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 29~36
DOI : 10.5389/KSAE.2014.56.5.029
The purpose of this study is to improve the Generic Agricultural Systems Simulator (GASS) which can simulate various rural systems based on object-oriented model. GASS provides the configuration platform of various system components to simplify integrated agricultural system models such as irrigation systems for rice farming. The new connection and communication modules of GASS improve applicability for modelling diverse systems. The geometric connection of GASS replaces topological connection, and communication protocols expand to analyze not only homogeneous system but also heterogeneous system. In this paper, we applied GASS2 to simulate the water heights of linked tanks and the simulation outputs were verified through comparing with analytical solutions of differential equations. The two new modules make it possible to analyze the 4-tank problem which includes topological and heterogenous issues with GASS2.
Physical, Mechanical Properties and Freezing and Thawing Resistance of Non-Cement Porous Vegetation Concrete Using Non-Sintering Inorganic Binder
Kim, Hwang Hee ; Kim, Chun Soo ; Jeon, Ji Hong ; Park, Chan Gi ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 37~44
DOI : 10.5389/KSAE.2014.56.5.037
The physical, mechanical and freezing and thawing properties of non cement porous vegetation concrete using non-sintering inorganic binder have been evaluated in this study. Four types of porous vegetation concrete according to the binder type is evaluated. The pH value, void ratio, compressive strength, repeated freezing and thawing properties were tested. The test results indicate that the physical, mechanical and repeated freezing and thawing properties of porous vegetation concrete using the non-sintering inorganic binder is increased or equivalent compared to the porous vegetation concrete using the blast furnace slag + cement and hwang-toh + cement binders. Also, Vegetation monitoring test results indicate the porous vegetation concrete using the non-sintering inorganic binder have increasing effects of vegetation growth.
Mechanical Properties and Durability of Abrasion of EVA Concrete Reinforced Steel Fiber
Sung, Chan Yong ; Nam, Ki Sung ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 45~54
DOI : 10.5389/KSAE.2014.56.5.045
This study was performed to evaluate compressive strength, flexural strength, static modulus of elasticity, stress-strain ratio and durability of abrasion on EVA concrete reinforced steel fiber (SF) in order to use hydraulic structures, underground utilities, offshore structures and structures being applied soil contaminated area. It is used ordinary portland cement, crushed coarse aggregate, nature fine aggregate, EVA redispersible polymer powder, superplasticizer and deforming agent to find optimum mix design of EVA concrete reinforced steel fiber. EVA concrete reinforced SF was effected on the improvement of mechanical properties and durability of abrasion.
Evaluation of the Applicability of Rice Growth Monitoring on Seosan and Pyongyang Region using RADARSAT-2 SAR -By Comparing RapidEye-
Na, Sang Il ; Hong, Suk Young ; Kim, Yi Hyun ; Lee, Kyoung Do ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 55~65
DOI : 10.5389/KSAE.2014.56.5.055
Radar remote sensing is appropriate for rice monitoring because the areas where this crop is cultivated are often cloudy and rainy. Especially, Synthetic Aperture Radar (SAR) can acquire remote sensing information with a high temporal resolution in tropical and subtropical regions due to its all-weather capability. This paper analyzes the relationships between backscattering coefficients of rice measured by RADARSAT-2 SAR and growth parameters during a rice growth period. And we applied the relationships to crop monitoring of paddy rice in North Korea. As a result, plant height and Leaf Area Index (LAI) increased until Day Of Year (DOY) 234 and then decreased, while fresh weight and dry weight increased until DOY 253. Correlation coefficients revealed that Horizontal transmit and Horizontal receive polarization (HH)-polarization backscattering coefficients were correlated highly with plant height (r=0.95), fresh weight (r=0.92), vegetation water content (r=0.91), LAI (r=0.90), and dry weight (r=0.89). Based on the observed relationships between backscattering coefficients and variables of cultivation, prediction equations were developed using the HH-polarization backscattering coefficients. Concerning the evaluation for the applicability of the LAI distribution from RADARSAT-2, the LAI statistic was evaluated in comparison with LAI distribution from RapidEye image. And LAI distributions in Pyongyang were presented to show spatial variability for unaccessible areas.
Hydraulic Characteristics of the Non-power Soil Cleaning and Keeping System by the Large-Scale Model Test at the Dike Gate
Park, Chan Keun ; Oh, Beom Hwan ; Lee, Dal Won ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 67~75
DOI : 10.5389/KSAE.2014.56.5.067
In this study, the large-scale hydraulic model test was performed to investigate the hydraulic characteristics for development of the non-power soil cleaning and keeping system at the dike gate. The outlet height, outflow number, outflow discharge, and outflow cycle were compared and analyzed. The non-power soil cleaning and keeping system was most effective at 11.2 mm in the outlet height. And then the mean outflow cycle was 1.09 sec, and the mean outflow discharge was
. The total outflow number increased gradually as the water level of a water tank increased, and the outlet height decreased. As a level of water tank decreased, the mean outflow cycle was lengthened, and the unit outflow discharge increased. This result showed this system was most effective. To remove the silty clay deposited in facilities, the methods of excavation, dredging, high pressure washing, etc have been applied to the tidal facilities such as land reclamation, a small size fishing port, and a harbor for maintenance. However, this is extremely cost-ineffective, whereas the non-power soil cleaning and keeping system will bring about an enormously positive economic effect. In addition, when the non-power soil cleaning and keeping system is applied to the dike gate of land reclamation, a thorough examination of the local tidal data and the careful system planning are required to prevent the disaster damage caused by flooding.
Projection of Consumptive Use and Irrigation Water for Major Upland Crops using Soil Moisture Model under Climate Change
Nam, Won Ho ; Hong, Eun Mi ; Jang, Min Won ; Choi, Jin Yong ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 77~87
DOI : 10.5389/KSAE.2014.56.5.077
The impacts of climate change on upland crops is great significance for water resource planning, estimating crop water demand and irrigation scheduling. The objective of this study is to predict upland crop evapotranspiration, effective rainfall and net irrigation requirement for upland under climate change, and changes in the temporal trends in South Korea. The changes in consumptive use and net irrigation requirement in the six upland crops, such as Soybeans, Maize, Potatoes, Red Peppers, Chinese Cabbage (spring and fall) were determined based on the soil moisture model using historical meteorological data and climate change data from the representative concentration pathway (RCP) scenarios. The results of this study showed that the average annual upland crop evapotranspiration and net irrigation requirement during the growing period for upland crops would increase persistently in the future, and were projected to increase more in RCP 8.5 than those in RCP 4.5 scenario, while effective rainfall decreased. This study is significant, as it provides baseline information on future plan of water resources management for upland crops related to climate variability and change.
Simulations of Reduction Effects on Runoff and Sediment for VFS Applications by Considering Uplands Characteristics in Iksan
Lee, Seul Gi ; Jang, Jeong Ryeol ; Choi, Kyung Sook ;
Journal of The Korean Society of Agricultural Engineers, volume 56, issue 5, 2014, Pages 89~99
DOI : 10.5389/KSAE.2014.56.5.089
The goal of this study was to evaluate sediment reduction effects of VFS (vegetative filter strip) applied for Iksan area in Saemangeum watershed. This study simulated runoff and sediment load from different types of uplands using VFSMOD-W. The general upland characteristics of the study area was investigated to build reasonable scenarios of the simulation. The simulation scenarios were designed by various areas, shapes, and slopes of uplands. Grass mixture was selected as VFS vegetation and the size of VFS was fixed as 10 % of uplands area. Additionally 50mm, 100mm, 150mm of daily rainfall were applied for the runoff and sediment simulation. As results, the calculated runoff and sediment loads were obtained
and 568.4~675,731.4 kg for the range of 0.1~1.0 ha of uplands with 7 % and 15 % slopes. The reduction effects on runoff and sediment were obtained 5~10 % and 21.0~47.7 % respectively from VFS applications. The VFSMOD-W simulations showed that runoff tended to increase as upland area and amount of rainfall increased while sediment increased when slope, length and area of uplands and amount of rainfall increased. These results indicated that rainfall amount and upland size are the critical factors for the generation of runoff and sediment load. In order to support this conclusion, further studies such as, long term monitoring, field experiments, and to calibrate and evaluate the model are necessary.