• 제목/요약/키워드: Agricultural water supply

검색결과 564건 처리시간 0.031초

소규모 농업용 저수지의 저류량-용수공급능력 결정에 관한 연구 (A Study on the Determination of Water Storage-Supply Capacity of Agricultural Reservoir)

  • 안승섭;정순돌;이증석;윤경덕;장인수
    • 한국환경과학회지
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    • 제11권12호
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    • pp.1217-1226
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    • 2002
  • This study aims at the effective estimation of water supply capacity of small scale reservoir and the proposal of the data which is necessary to establish the water resources management plan of down stream area of the reservoir in the future by comparison and examination about reservoir operation technique for the security of agricultural water in small scale reservoir. The result of flow calculation by Tank model is used for the input data as the inflow data which is needed for the analysis of water supply capacity. Stochastic method, simulation method, and optimization method are used to examine the water supply capacity, and water security amount is compared with each method. From the analyses of water supply capacities by each method, slightly different results are shown in spite of the effort to compare them equally using input data such as inflow data under equal conditions, and the comparison of water supply capacities by each method are as follows; linear planning method, simulation method, and transition probability matrix method in the order of amount from the largest. It is thought that the simulation method in which comparatively reasonable application of the inflow data is possible and is simulated in successive time series dam operation of the three methods used in this study thus, simulation model is proper to estimate the water supply capacity of agricultural small scale reservoir. And it is judged that the heightening of efficiency of water resources utilization according to the development of downstream area of dam may be possible using the upward readjusted water supply amount of $55.18{\tiems}10^6ton$ and $63.7{\times}10^6ton$ at 95% and 90% supply reliability respectively which are above the planning water supply amount of $50.0{\times}10^6$ton when the simulation method is introduced as the standard.

물수지 분석법을 이용한 제주도 권역별 미래 농업용 지하수 공급 가능량 추정 (Estimation of Regional Future Agricultural Available Groundwater Supply in Jeju Island Using Water Balance Method)

  • 송성호;이규상;명우호;안중기;백진희;정차연
    • 한국지하수토양환경학회지:지하수토양환경
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    • 제24권2호
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    • pp.23-37
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    • 2019
  • To evaluate the available groundwater supply to the agricultural water demand in the future with the climate change scenarios for 40 sub-regions in Jeju Island, groundwater recharge and the available groundwater supply were estimated using water balance analysis method. Groundwater recharge was calculated by subtracting the actual evapotranspiration and direct runoff from the total amount of water resources and available groundwater supply was set at 43.6% from the ratio of the sustainable groundwater capacity to the groundwater recharge. According to the RCP 4.5 scenario, the available groundwater supply to the agricultural water demand is estimated to be insufficient in 2020 and 2025, especially in the western and eastern regions of the island. However, such a water shortage problem is alleviated in 2030. When applying the RCP 8.5 scenario, available groundwater supply can't meet the water demand over the entire decade.

가뭄사상 및 농업수리시설물이 쌀 생산량에 미치는 영향에 대한 상관 분석 (On the Linkage Between Irrigation Facilities and Rice Production Under Drought Events)

  • 우승범;남원호;전민기;윤동현;김태곤;성재훈;김한중
    • 한국농공학회논문집
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    • 제63권5호
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    • pp.95-105
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    • 2021
  • Drought is a disaster that causes prolonged and wide scale damage. Recently, the severity and frequency of drought occurrences, and drought damage have been increased significantly due to climate change. As a result, a quantitative study of drought factors is needed to better understand and prevent future droughts. In the case of agricultural drought, several existing studies examine the economic damage caused by droughts and their causes, but these studies are not well suited to estimating crop-oriented agricultural drought damage and the factors that absolutely affect agricultural drought. This study determines which factors most affect agricultural drought. It examines meteorological factors and those related to agricultural water supplied by irrigation facilities. Rice paddy production per unit area is lower than the average from the last two years where agricultural drought occurred. We compare the relative frequency of agricultural drought impacts with irrigation facilities, effective reservoir storage, the number of water supply facilities, and the meteorological drought index such as Standardized Precipitation Index (SPI). To identify factors that affect agricultural drought, we correlate rice paddy production anomalies with irrigation water supply for the past two years. There was a high positive correlation between rice paddy production and irrigation water usage, and there was a low or moderate negative correlation between rice paddy production anomalies compared to the average of the past two years and SPI. As a result, agricultural water supply by irrigation facilities was judged to be more influential than meteorological factors in rice paddy production. This study is expected to help local governments establish policies related to agricultural drought response.

둑높임저수지 다중용수공급에 따른 운영 방안 분석 (Analysis of Operation Plan by Multipurpose Supply for Heightened Agricultural Reservoir)

  • 김해도;이광야;박종윤;한국헌;임형창
    • 한국관개배수논문집
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    • 제19권1호
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    • pp.77-86
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    • 2012
  • The aim of this study was to analyze the operation plan for heightened agricultural reservoir, in terms of water supply to downstream paddy fields and instreams. Operation of agricultural reservoir before the heightened reservoir project is easy to manage because of its single purpose, which is irrigation water supply. However, after proceeding the heightened project, there is needed to be set the operation rule because of its multiple purpose, which is water for irrigation and supply to the stream. In this paper, propose the method of design the criteria of supply to the stream and operation rule curve for the heightened reservoir. According to simulation results by proposed operating rule for the Gumsa reservoir, the yearly amount of water supply to the stream can be 2,588 thousand $m^3$, 3 times of the heightened space (2,588 thousand $m^3$).

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실시간 관개수로 수위 모니터링을 활용한 논 관개용수 공급적정성 평가 (Evaluation of Water Supply Adequacy using Real-time Water Level Monitoring System in Paddy Irrigation Canals)

  • 홍은미;남원호;최진용;김진택
    • 한국농공학회논문집
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    • 제56권4호
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    • pp.1-8
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    • 2014
  • Appropriate amount of water supply to paddy fields in proper time is important to achieve efficient agricultural water management. The purpose of this study is to evaluate the irrigation water supply adequacy for paddy fields using water level data in irrigation canals. For the evaluation, the real-time water level data were collected from main canals in the Dongjin irrigation district for 2 years. Using the water level data, delivered irrigation water amounts at the distribution points of each canal were calculated. The water balance model for paddy field was designed considering intermittent irrigation and the irrigation water requirement was estimated. Irrigation water supply adequacy was analyzed from main canals to the irrigation blocks based on the comparison between estimated requirement and delivered irrigation water amounts. From the adequacy analysis, irrigation water supply showed poor management condition in 2012 with low efficiency except the Daepyong canal section, and the adequacy in 2013 was good or fair except the Yongsung canal section. When irrigation water for paddy fields was insufficient, water supply adequacy was affected by irrigation area, but when irrigation water was enough to supply, adequacy was affected by distance from main canal to distribution points. These results of the spatial and temporal dimensions of the irrigation adequacy could be utilized for efficient irrigation water management to improve the temporal uniformity and equity in the water distribution for paddy fields.

복합영농 관개지구의 배수량 모의 모형의 개발 (Surface Drainage Simulation Model for Irrigation Districts Composed of Paddy and Protected Cultivation)

  • 송정헌;강문성;송인홍;황순호;박지훈;안지현
    • 한국농공학회논문집
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    • 제55권3호
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    • pp.63-73
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    • 2013
  • The objectives of this study were to develop a hydrologic simulation model to estimate surface drainage for irrigation districts consisting of paddy and protected cultivation, and to evaluate the applicability of the developed model. The model consists of three sub-models; agricultural supply, paddy block drainage, and protected cultivation runoff. The model simulates daily total drainage as the sum of paddy field drainage, irrigation canal drainage, and protected cultivation runoff at the outlets of the irrigation districts. The agricultural supply sub-model was formulated considering crop water requirement for growing seasons and agricultural water management loss. Agricultural supply was calculated for use as input data for the paddy block sub-model. The paddy block drainage sub-model simulates paddy field drainage based on water balance, and irrigation canal drainage as a fraction of agricultural supply. Protected cultivation runoff is calculated based on NRCS (Natural Resources Conservation Service) curve number method. The Idong reservoir irrigation district was selected for surface drainage monitoring and model verification. The parameters of model were calibrated using a trial and error technique, and validated with the measured data from the study site. The model can be a useful tool to estimate surface drainage for irrigated districts consisting of paddy and protected cultivation.

이수관리곡선에 의한 증고저수지의 하천유지유량 공급 가능성 평가 (Evaluation of Supplying Instream Flow by Operation Rule Curve for Heightening Irrigation Reservoir)

  • 이재남;노재경
    • 농업과학연구
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    • 제37권3호
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    • pp.481-490
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    • 2010
  • Baekgog reservoir is located in Jincheon county, Chungbuk province, of which full water levels will be heightened from EL. 100.1 m to EL. 102.1 m, and total storages from 21.75 $Mm^3$ to 26.67 $Mm^3$. The simulation for reservoir inflow was conducted by DAWAST model. The annual average irrigation water was estimated to 33.19 $Mm^3$ supplied to 2,975 ha and the instream flows could be allocated with 0.14 mm/d from October to April with annual average of 2.52 $Mm^3$. The operation rule curve was drawn using inflow, irrigation, and instream flow requirements data. The reservoir water storage was simulated on a daily basis in case of both normal and withdrawal limit operation. In case of normal operation, the annual average irrigation water supply increased from 31.95 $Mm^3$ to 33.32 $Mm^3$, the instream water supply from 2.40 $Mm^3$ to 2.44 $Mm^3$, the water storages from 15.74 $Mm^3$ to 19.88 $Mm^3$, and the water supply reliability from 77.3 % to 81.6 %. In case of operation with withdrawal limit, the amount of instream water supply was 2.52 $Mm^3$ from reservoir regardless of the condition while the water storage increased from 16.77 $Mm^3$ to 20.65 $Mm^3$. The irrigation water supply capacity was appropriate for the case of normal operation with 2 m heightened condition. The present instream water supply capacity was 35,000 $m^3$/d (6.86 $Mm^3$/y) while 42,000 $m^3$/d (8.36 $Mm^3$/y) in 2 m heightened condition in case of withdrawal limit operation.

한강수계 관개용 저수지의 공급량 조사 (Surveying Water Supply from Irrigation Reservoirs in the Han River Basin)

  • 임상준;강민구;박승우;박창언
    • 한국농공학회지
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    • 제42권6호
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    • pp.37-44
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    • 2000
  • The objectives of the research were to modify and validate a daily water balance model, DIROM, for irrigation reservoirs using field data, and to estimate daily water supply from the reservoirs in the Han river basin. Modified DIROM was applied to three test sites, and validated with field data. The relative errors between the simulated and observed water supply were less than 10 percent. Historical records on daily or ten-day’s storage for 110 reservoirs from the twenty Farmland Improvement Associations, FIA were collected and used to estimate the daily water supply during 1993 to 1997. The results were applied to the other 723 reservoirs that are not owned by FIA. The five-year averaged annual water supply from the reservoirs was estimated to be 180 million ㎥/yr. Maximum yearly water supply was recorded to be 190 million ㎥/yr in 1996.

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광역 용수계통을 고려한 농업용수 필요수량의 산정 - 섬진강댐 수혜구역을 중심으로 - (Estimation of Agricultural water demand considering multi-wide water supply system - On irrigation area of Sumjingang-dam -)

  • 문종원;정진호;장중석
    • 한국농공학회:학술대회논문집
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    • 한국농공학회 2003년도 학술발표논문집
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    • pp.423-426
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    • 2003
  • The purpose of this paper is to estimate Agricultural water demand at irrigation area of sumjin reservoir, the Dongjin River basin, which consist of multi-wide water supply system and complicated irrigation channel and supplementary irrigation facilities.

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식품 소비 및 칼로리 공급 변화에 따른 가상수 소비량의 변화 분석 (Estimation of the Virtual Water Consumption for Food Consumption and Calorie Supply)

  • 이상현;최진용;유승환
    • 한국농공학회논문집
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    • 제57권3호
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    • pp.77-86
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    • 2015
  • The agricultural water management generally has focused on water resources for crop production but it could be affected by the food consumption pattern. The aim of this study is to estimate virtual water consumption for food consumption and calorie supply using the water footprint and virtual water concept. In addition, we estimated the virtual water requirements for increasing the food and calorie self-sufficiency adjusted by the government for food security. About $330.0m^3/cap/yr$ of virtual water was consumed for the main foods consumption in 1985, and it was increased to $450.0m^3/cap/yr$ in 2010. The rate of virtual water consumption by meats consumption was 28 % in 1985 but it was increased to 54 % in 2010. In other words, the total virtual water consumption by foods consumption was increased from 1985 to 2010 with the high rate of meats consumption. The average $1.29m^3$ of virtual water was consumed for supplying 1 calorie per capita in 2010 but about $10.1m^3/cal$ of virtual water was consumed by only bovine meats consumption. The food self-sufficiency is the main factor for food security in Korea. About $46.5Mm^3$ and $393.9Mm^3$ of virtual water were required in order to increase the food and calorie self-sufficiency of wheat by 1 % individually. This study showed the water consumption was related to food consumption and calorie supply pattern, and these results could be used as the indices for the agricultural water management considering the change of eating habit and food security.