• Title/Summary/Keyword: irrigation water supply

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Streamflow Monitoring of Rural Small Streams for Environmental Flows Supply from Irrigation Reservoir (농촌 소하천의 농어촌환경용수 공급을 위한 하천유량 모니터링)

  • Kim, Sang Min;Kim, Sung Jae;Kim, Yong Wan;Park, Tae Yang;Kim, Sung Min;Park, Ki Wook;Jang, Min Won
    • Journal of agriculture & life science
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    • v.45 no.6
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    • pp.237-249
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    • 2011
  • The purpose of this study was to monitor the streamflow of rural streams for investigating the status of stream depletion located downstream of irrigation reservoir. Bonghyun and Hi reservoirs area, located in Gyeongnam, Gosung-gun, Hi-myeon, were selected for study watersheds and streams. Streamflow monitoring were conducted 6 times during the paddy growing season of 2010 from May to October. Streamflow was measured for 18 stations downstream from two reservoirs with the interval of 300m to 500m, The amount of streamflow were highly dependent on the antecedent precipitation and irrigation amount. In most observation stations, streamflow was depleted when precipitation and irrigation were not provided. Pumping from stream for irrigation and water supply for factory and irrigation return flow were also factors on streamflow. Continuous monitoring for rural streams located in downstream of reservoirs are required to quantify the status of streamflow depletion and determine the amount of environmental flows.

Valuation of Irrigation Water: A Chance-Constrained Programming Approach (확률제약 계획모형법을 이용한 농업용수의 경제적 가치 평가)

  • Kwon, Oh-Sang;Lee, Tae-Ho;Heo, Jeong-Hoi
    • Journal of Korea Water Resources Association
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    • v.42 no.4
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    • pp.281-295
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    • 2009
  • This study estimates the value of irrigation water in Korea using an economic programming model that is constructed with all the resource endowment constraints, technology restrictions and policy variables. The variability and uncertainty of water resource endowment are incorporated into the model through the chance-constrained technique. Solving the profit maximization problems with gradually reduced water endowments, we derive a series of shadow values of irrigation water. It has been found that uncertainty in water supply raises the damage from water loss, and the marginal damage increases in water loss.

Paddy Rice Culture Experiment Using Treated Sewage Effluent From Constructed Wetland (인공습지 오수처리수를 이용한 벼재배 실험)

  • 윤춘경;함종화;우선호;김민희
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.43 no.2
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    • pp.94-104
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    • 2001
  • A pilot study was performed at the experimental field of Konkuk University in Seoul, to examine the feasibility of the constructed wetland system for sewage and the effect of treated sewage irrigation on the paddy rice culture and its soil characteristics. The constructed wetland performed well, in that effluent concentrations of pollutants were significantly lower than concentrations of the influent. Median removal efficiencies of BOD$_{5}$ was about 78% and slightly lower during winter. Removal efficiencies form TN and TP were approximately 48 and 21%, respectively, and relatively less effective than that of BOD$_{5}$. Irrigation of treated sewage to paddy rice culture did not affect adversely in both growth and yield of rice. Instead, plots of treated sewage irrigation showed up to 50% more yield in average than the control plot. It implies that treated sewage irrigation might be beneficial to rice culture rather than detrimental as long as it is treated adequately and used properly. Soil was sampled and analyzed before transplanting and after harvesting. pH was slightly increased due to irrigation water, but it may not be concerned as long as the treated sewage is within the normal range. EC was increased in first year but decreased in second year, therefore salts accumulation in the soil could be less concerned. OM and CES was slightly increased, which might be beneficial on growing plants. TN did not show apparent pattern. Available phosphorus was decreased after rice culture, but the quantity of phosphorus(TP-available phosphorus) was rather increased which implies that excessive phosphorus supply may result in phosphorus accumulation in the soil. Overall, the constructed wetland was thought to be an effective sewage treatment alternative, and treated sewage could be reused as a supplemental source of irrigation water for paddy rice culture without causing adverse effect as long as it is treated adequately and used properly. For full-scale application, further investigation should be followed on environmental risk assessment, tolerable water quality, and fraction of supplemental irrigation.ion.

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Current Status and Application of Agricultural Subsurface Dams in Korea (국내 농업용 지하댐의 현황 및 활용 사례)

  • Yong, Hwan-Ho;Song, Sung-Ho;Myoung, Woo-Ho;An, Jung-Gi;Hong, Soon-Wook
    • Journal of Soil and Groundwater Environment
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    • v.22 no.3
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    • pp.18-26
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    • 2017
  • The increasing frequency of droughts has been increasing the necessity of utilizing subsurface dams as reliable groundwater resources in areas where it is difficult to supply adequate agricultural water using only surface water. In this study, we analyzed the current status and actual conditions of five agricultural subsurface dams as well as the effect of obtaining additional groundwater from subsurface dams operated as one aspect of the sustainable integrated water management system. Based on the construction methods and functions of each subsurface dam, the five subsurface dams are classified into three types such as those that derive water from rivers, those that prevent seawater intrusion, and those that link to a main irrigation canal. The classification is based on various conditions including topography, reservoir location, irrigation facilities, and river and alluvial deposit distributions. Agricultural groundwater upstream of subsurface dams is obtained from four to five radial collector wells. From the study, the total amount of groundwater recovered from the subsurface dam is turned out to be about 29~44% of the total irrigation water demand, which is higher than that of general agricultural groundwater of about 4.6%.

Irrigation Facility for Agricultural Use of Rokugo Alluvial Fan in Yokote Basin, Northeastern Japan (일본 동북지방 요코테 분지 내 로쿠고 선상지의 농업적 토지이용을 위한 관개시설 - 원통형 사이펀(siphon) 방식 분수공(分水工)을 대상으로-)

  • Kim Tae-Ho;Son Ill
    • Journal of the Korean Geographical Society
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    • v.41 no.4 s.115
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    • pp.507-512
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    • 2006
  • This paper introduces an irrigation facility for agricultural use of Rokugo alluvial fan in Yokote Basin, northeastern Japan. A cylindrical distributor of agricultural water is able to supply water accurately to seven irrigated areas through its 180 orifices and one circular baffle, implying that people around fan areas has been tenacious of agricultural water. It has been recently reevaluated as tourism resources or symbolic landscape reflecting regional characteristics even though its functional value has decreased.

Development and Application of Water Balance Network Model in Agricultural Watershed (농업용수 유역 물수지 분석 모델 개발 및 적용)

  • Yoon, Dong-Hyun;Nam, Won-Ho;Koh, Bo-Sung;Kim, Kyung-Mo;Jo, Young-Jun;Park, Jin-Hyeon
    • Journal of The Korean Society of Agricultural Engineers
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    • v.66 no.3
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    • pp.39-51
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    • 2024
  • To effectively implement the integrated water management policy outlined in the National Water Management Act, it is essential to analyze agricultural water supply and demand at both basin and water district levels. Currently, agricultural water is primarily distributed through open canal systems and controlled by floodgates, yet the utilization-to-supply ratio remains at a mere 48%. In the case of agricultural water, when analyzing water balance through existing national basin water resource models (K-WEAP, K-MODISM), distortion of supply and regression occurs due to calculation of regression rate based on the concept of net water consumption. In addition, by simplifying the complex and diverse agricultural water supply system within the basin into a single virtual reservoir, it is difficult to analyze the surplus or shortage of agricultural water for each field within the basin. There are limitations in reflecting the characteristics and actual sites of rural water areas, such as inconsistencies with river and reservoir supply priority sites. This study focuses on the development of a model aimed at improving the deficiencies of current water balance analysis methods. The developed model aims to provide standardized water balance analysis nationwide, with initial application to the Anseo standard watershed. Utilizing data from 32 facilities within the standard watershed, the study conducted water balance analysis through watershed linkage, highlighting differences and improvements compared to existing methods.

Effect of SRI Water Management on the Reduction of Greenhouse-gas Emissions and Irrigation Water Supply in Paddy (논에서 SRI 물관리 방법에 의한 온실가스와 관개용수 저감효과 분석)

  • Seo, Jiyeon;Park, Baekyung;Park, Woonji;Lee, Suin;Choi, Yonghun;Shin, Minhwan;Choi, Joongdae
    • Journal of The Korean Society of Agricultural Engineers
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    • v.60 no.1
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    • pp.79-87
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    • 2018
  • Water management impacts both methane ($CH_4$) and nitrous oxide ($N_2O$) emissions from rice paddy fields. Although irrigation is one of the most important methods for reducing $CH_4$ emission in rice production systems it can also $N_2O$ emissions and reduce crop yields. A feasibility study on the system of rice intensification (SRI) methods with respect to irrigation requirements, greenhouse gas (GHG) emissions was conducted for either 2 or 3 years depending on the treatment in Korea. The SRI methods (i.e. SRI and midsummer drainage (MD) with conventional practice (CT)) reduced the irrigation requirement by 49.0 and 22.0 %, respectively. Global warming contribution of GHG to different depending on the type of GHG. Therefore, the emission of $CH_4$ and $N_2O$ shall be converted to Global Warming Potential (GWP). The GHG emission from the conventional practice with midsummer drainage (MD) and the SRI plots, in GWP were reduced by 49.1 and 77.1 %, respectively. Application of SRI water management method could help to improve Korea's water resources and could thus contribute to mitigation of the negative effects of global warming.

Simulating Daily Inflow and Release Rates for Irrigation Reservoirs(II) -Modeling Reservoir Release Rates- (관개용 저수지의 일별 유입량과 방류량의 모의 발생(II) -저수지 통관 방류량의 추정-)

  • 김현영;박승우
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.30 no.2
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    • pp.95-104
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    • 1988
  • This study refers to the development of a hydrologic model simulating daily inflow and release rates for inigation reservoirs. A daily - based model is needed for adequate operation of an irrigation reservoir sufficing the water demand for paddy fields which is closely related to meteorological conditions. And the objective of this study is to develop a reservoir release rate model and then to calibrata the parameters. The release rates model considers daily water demands , water supply for transplanting, minmum release for maintaining canal flow, and maxirnun and regular flooding depth for determining effective rainfall on paddy fields. Each of the factors in the model was regarded as a lumped pararuter representing the average condition of a whole irrigated area. The water demand was estimated form the potential evapotranspiration by Penman method, the effective rainfall, and the infiltration on paddy fields. The release model was found to be capable of adequately simulating daily reservoir releases based on meteorological data.

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Analysis of Scenarios for Environmental Instream Flow Considering Water Quality in Saemangeum Watershed (새만금유역의 수질을 고려한 환경유지용수의 시나리오 분석)

  • Kim, Se-Min;Park, Young-Ki;Won, Chan-Hee;Kim, Min-Hwan
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.3
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    • pp.117-127
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    • 2016
  • In this study, analyzed scenarios of the environmental instream flow for water quality improvement in Saemangeum watershed. In order to get an environmental instream flow, Methodology is selected for Retention-Basin, reservoir expansion, new dam construction, Modification of water intake and drainage system, Rearrangement of plan for system which Yongdam and Seomjin river dam have been used water supply. The study composed of diverse scenario of Environmental instream flow increasement and analyzed the effect of improving the water quality by the QUAL2K model and calculation of runoff for saemangeum watershed by SWAT model. The following water quality indicators have been simulated in irrigation and non-irrigation period for BOD and T-P. When scenarios applied to water quality model, Improvement rate in the water quality for Total Maximum Daily loads of Mankyung B unit watershed during irrigation and non-irrigation period is BOD (28.70%), T-P (17.09%) and BOD (28.51%), T-P (28.68%) respectively. Dongjin A unit watershed during irrigation and non-irrigation period is BOD (14.39%), T-P (14.59%) and BOD (15.54%), T-P (19.46%) similary. Simulation results is to quantify the constribution of the improvement in the water quality. In particular, It was demonstrative that improving effect for water quality was evaluated to be great in non-irrigation period.

Vulnerability Evaluation for Water Supply of Irrigation Facilities: Focusing on Dangjin-si, Yesan-gun, Cheongyang-gun, South Korea (밭관개 시설물의 용수공급에 대한 취약성 평가 - 당진시, 예산군, 청양군을 대상으로 -)

  • Shin, Hyung-Jin;Kwon, Hyung-Joong;Lee, Jae-Yeong;Lee, Jin-Heong;Park, Chan-Gi
    • Journal of The Korean Society of Agricultural Engineers
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    • v.60 no.6
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    • pp.33-42
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    • 2018
  • This study evaluated the vulnerability of irrigation water supplied to the crops. The target areas were selected as Dangjin-si, Yesan-gun, and Cheongyang-gun. The survey items of the climate exposure were annual precipitation and rainless days. The sensitivity survey items were cultivation area, groundwater level, evapotranspiration and groundwater consumption. The survey items of the adaptability were Number of groundwater well and Water supply ratio. The survey methods for these items were investigated in a variety of ways, including "National Climate Data Service System", "Korean Statistical Information Service", "National ground water monitoring network in korea annual report" and "Chungcheongnam-do Statistical Yearbook", "HOMWRS". Vulnerability assessment results were rated within the range of 0~100 points. The first grade was rated 0-25, the second grade 26-50, the third grade 51-75, and the fourth grade 76-100. And the lower the score, the lower the vulnerability. As a result, Cheongyang-gun showed a high vulnerability of over 50 points, Dangjin-si showed a low vulnerability rating of 31.20 points and a Yesan-gun of 36.00 points.