• Title/Summary/Keyword: Irrigation reservoir

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Nutrient Balance in the Paddy Fields Watershed with a Source of River Water (하천관개지역 광역논에서의 영양물질의 물질수지)

  • 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
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    • v.56 no.5
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    • pp.11-19
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    • 2014

  • The objective of this research was to investigate concentration and load of nutrients such as total nitrogen (TN), nitrate nitrogen ($NO_3$-N) total phosphorous (TP), and phosphate phosphorous ($PO_4$-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.

  • https://doi.org/10.5389/KSAE.2014.56.5.011 인용 PDF KSCI

Characteristics and Correlation among Water Quality Parameters of Idong Reservoir Watershed (논문 - 이동저수지 유역의 수질 특성 및 항목간 상관관계 분석)

  • Kim, Hyung-Joong;Haam, Jong-Hwa;Kim, Dong-Hwan;Hong, Dae-Byuk
    • KCID journal
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    • v.18 no.2
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    • pp.15-24
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    • 2011

  • This study was carried out to analyze characteristics of water quality and correlation among water quality parameters in Idong reservoir used for agricultural water. The pH and concentrations of DO, SS, BOD, COD, TP, Chl-a in Idong reservoir almost met the water quality standards for agricultural water, but TN concentration exceeded the water quality standards for agricultural water. All of water quality items had no significant difference between horizontal points at 95% confidence level and the Idong reservoir was possible to be treated as the single water body. As NIP ratio of the Idong reservoir is 52, TP is a limiting nutrient salt. As TN exceeds the water quality standards, it is required to preserve TP below current state to prevent water bloom by eutrophication. Therefore, reduction of phosphorus from the watershed is necessary for controlling the eutrophication of Idong reservoir.

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Simplified Analysis of Agricultural Water Network Model Using SWMM - A Case Study of Mandae Reservoir - (SWMM을 활용한 농업용수 네트워크 모형 단순화 분석 - 만대 저수지 사례를 중심으로 -)

  • An, Sung-Soo;Bang, Na-Kyoung;Lee, Jong-Seo;Bang, Sung-Soo;Nam, Won-Ho;Kim, Han-Joong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.64 no.1
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    • pp.27-37
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    • 2022

  • This study established a water supply network based on the operation case of Mandae Reservoir in Yanggu-gun, Gangwon-do, to analyze the efficient distribution and management of agricultural water supplied from the reservoir to irrigation areas using the hydraulic analysis model SWMM. In order to construct a model to analyze the water canal network, network conditions needs to be simplified, and in particular, excessive detail or simplification of the irrigation area can lead to errors in the analysis results. Therefore, the effect of the water canal network model was analyzed by simulating the appropriate simplification process step by step. The results of simplifying the actual block shape of the analysis target area using SWMM showed that there was no significant difference in the results even if 7 lots were simplified to 2. Also, it was found that the construction and analysis of a simplified network model were reliable when the excess quantity was 2% or more compared to the required quantity for each case of analysis of the paddy field.

  • https://doi.org/10.5389/KSAE.2022.64.1.027 인용 PDF KSCI HTML