• Title/Summary/Keyword: Agricultural Water

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Dynamic evaluation of water source safety based on fuzzy extension model

  • Ou, Bin;Gong, Aimin;He, Chunxiang;Fu, Shuyan
    • Membrane and Water Treatment
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    • v.10 no.2
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    • pp.149-154
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    • 2019
  • The information matter-element system was built to assess safety of water source. Based on the thought of multiindex fusion, fuzzy matter-element model evaluating water source behavior was constructed by matter-element transform. This model can process comprehensively hydrogeological data, ecological environment, water pollution, surface disturbance, and so on. Water source safety behavior can be described by the qualitative and quantitative manners. According to the development trend of quantitative results, water source safety behavior can be expressed dynamically. As an example, the proposed method was used to assess safety status of 7 water sources in the region. The numerical example shows that the proposed method is feasible and effective, and the evaluation results are reasonable.

Analysis of Water Balance and Development of the Irrigation Water Management System in Geumgang 2nd District (금강II지구 유역물수지 분석 및 용수관리 프로그램 개발)

  • Kim, Jin-Taek;Oh, Soo-Hun;Kang, Suk-Min
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2003.10a
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    • pp.487-490
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    • 2003
  • Geumgang 2nd agricultural comprehensive development project is to develope the infrastructure in 43,000ha agricultural area. For this is the very large project, it is necessary to consider the plan of water use comprehensively. Therefore, watershed water balance model for this project has been developed and a variety of analysis has been carried out. And Geumgang Project Water Management System has been developed for the manager of irrigation facilities.

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Seasonal Variation of Water Quality of the Watersheds in the Agricultural Environment Promotion Zone (환경농업조성지구내 용수원 및 채수시기별 수질비교)

  • Kim, Chan-Yong;Kim, Chang-Bae;Kim, Jong-Soo;Seo, Young-Jin;Yoon, Jae-Tak
    • Korean Journal of Environmental Agriculture
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    • v.21 no.3
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    • pp.165-171
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    • 2002
  • A study was conducted to investigate the seasonal changes in water quality of watershed in the Agricultural Environment Promotion Zone. Samples collected were 12 GW (ground water), 2 IW (irrigation water), 2 SW (stream water) in An-Dong City, 4 GW, 6 IW, 11 SW in Young-Yang Gun, and sampling was conducted separately during dry and rainy season. In the ground water, EC and ionic species, except pH, were higher than those in stream water, and especially $NO_3-N$ concentration exceeded the limitation of drinking water. Concentration of ions decreased as the sampling depth was far from the soil surface. During a rainy season, the concentrations of $NO_3-N$ and K in the stream water were slightly higher than those during season. COD was lower during dry season in Yong-Yang, while the trend was contrasted to An-Dong. These results suggest that ground water was polluted by fertilization and compost while streamwater was polluted by loss of soil and organic during the rainy season. Principal chemical components related with changing water quality were EC, $NO_3^-$, Ca, Mg, Na, $Cl^-$, $Cl^-$, $SO_4^-$ in ground water, whereas $NH_4-N$, K, Mg, $Cl^-$, $SO_4^-$ in stream water.

Irrigation Water Requirements for Upland Crops Using Rainfall Data and Water Management Guidelines (강우 자료와 밭작물 물관리 지침서를 이용한 노지 밭작물의 관개 필요량 산정 연구)

  • Choi, Yonghun;Kim, Youngjin;Kim, Yongwon;Kim, Minyoung;Jeon, Jonggil
    • Journal of The Korean Society of Agricultural Engineers
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    • v.61 no.1
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    • pp.121-130
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    • 2019
  • The purpose of this study is to determine the amount of irrigation water for upland crop growth based on the 30 year of historical rainfall data and the water management guidelines as a reference. Five regions and ten crops were selected by their cultivation size. The changes of soil moisture contents were calculated using daily mean rainfall and irrigation demand. This study assumed that crops are irrigated when the soil moisture contents fell below of the field capacity for more than 5 days, which is the drought condition defined by RDA. The maximum irrigation water requirements was 167.2 mm for chinese cabbage during the growing season, which was followed by corn (112.0 mm), daikon (102.3 mm), spinach (66.1 mm), lettuce (56.7 mm), pepper (46.5 mm), potato (33.9 mm), sweet tomato (27.4 mm), peanut (11.5 mm) and bean (10.3 mm), The results of this study could contribute to providing valuable data to determine the capacity of irrigation facilities and to establish the emergency operation plans under extreme unfavorable weather condition (heat wave, etc.) for crop growth.

Improvement of Drought Operation Criteria in Agricultural Reservoirs (농업용 저수지 이수관리를 위한 저수율 가뭄단계기준 개선)

  • Mun, Young-Sik;Nam, Won-Ho;Woo, Seung-Beom;Lee, Hee-Jin;Yang, Mi-Hye;Lee, Jong-Seo;Ha, Tae-Hyun
    • Journal of The Korean Society of Agricultural Engineers
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    • v.64 no.4
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    • pp.11-20
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    • 2022
  • Currently, the operation rule of agricultural reservoirs in case of drought events follows the drought forecast warning standard of agricultural water supply. However, it is difficult to preemptively manage drought in individual reservoirs because drought forecasting standards are set according to average reservoir storage ratio such as 70%, 60%, 50%, and 40%. The equal standards based on average water level across the country could not reflect the actual drought situation in the region. In this study, we proposed the improvement of drought operation rule for agricultural reservoirs based on the percentile approach using past water level of each reservoir. The percentile approach is applied to monitor drought conditions and determine drought criteria in the U.S. Drought Monitoring (USDM). We applied the drought operation rule to reservoir storage rate in extreme 2017 spring drought year, the one of the most climatologically driest spring seasons over the 1961-2021 period of record. We counted frequency of each drought criteria which are existing and developed operation rules to compare drought operation rule determining the actual drought conditions during 2016-2017. As a result of comparing the current standard and the percentile standard with SPI6, the percentile standard showed severe-level when SPI6 showed severe drought condition, but the current standard fell short of the results. Results can be used to improve the drought operation criteria of drought events that better reflects the actual drought conditions in agricultural reservoirs.

Study on Characteristics of Water Management in Agricultural Experimental Site. (농업용수 시험지구의 물관리 특성 조사.분석)

  • Kim, Jin-Taek;Ju, Wook-Jong;Lee, Jong-Nam
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2005.10a
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    • pp.61-67
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    • 2005
  • Agricultural water for rice growing is the important factor of water resources in Korea. so, it is imperative to know the practice of water management in paddy field. The experimental site has been operated in order to investigate water management practice and water supply discharge since 2001. There are 8 irrigation areas which are observed the water supply discharge in this site. We have investigate the water management practice in this site and we know that the practical date of rice growing stages and the date for calculating the water demand in paddy field. So, There is much differences between the calculated water demand and practical water supply. We could reduce the differences by calculating the water demand using the practical date of rice growing stages.

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Response of Crop Water Stress Index (CWSI) and Canopy Temperature of Apple Tree to Irrigation Treatment Schemes (관개수준별 사과나무의 엽온 및 수분 스트레스 지수 변화 분석)

  • Kim, Minyoung;Choi, Yonghun;Cho, Junggun;Yun, Seokkyu;Park, Jeonghun;Kim, Youngjin;Jeon, Jonggil;Lee, Sangbong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.61 no.5
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    • pp.23-31
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    • 2019
  • Crop response to weather and internal water pressure changes is more sensitive to crop water stress than soil water content. Recently, its implementation to optimal irrigation scheduling has been receiving much attention. This study was conducted to determine and compare the theoretical crop water stress index (CWSI) using meterological data and canopy temperature collected from three different irrigation treatments, which were Tr-1 plot (rainfed), Tr-2 plot (50% of daily evapotranspiration (ET) irrigated) and Tr-3 plot (75% of daily evapotranspiration (ET) irrigated). The readings of canopy temperature and CWSI were significantly different among irrigation treatment schemes. The average canopy temperatures and CWSIs of Tr-1 and Tr-3 plots were $34.6^{\circ}C$ and $32.6^{\circ}C$, 0.79 and 0.64, respectively. Solar radiation had the biggest correlation with CWSI (R=0.68) which was followed by wind speed, relative humidity and air temperature. Overall, the findings of this study indicated that canopy temperatures and CWSIs could be further used for irrigation scheduling for crop growth.

Economic Impacts of Agricultural Water Shortages in Korea - A Combined Top-down and Bottom-up Model Analysis - (상·하향 통합모형을 활용한 농업 수자원 부족의 경제적 효과 분석)

  • Lee, Seoung-Ho;Kwon, Oh-Sang;Kang, Sung-Won
    • Journal of Korean Society of Rural Planning
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    • v.23 no.4
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    • pp.111-126
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    • 2017
  • This study analyzes the impacts of agricultural water shortages in Korea using a combined top-down and bottom-up model. A multi-region multi-output agricultural sector model with detailed descriptions of production technologies and water and land resource constraints has been combined with a standard CGE model. The impacts of four different water shortage scenarios were simulated. It is shown that an active adaptation of crop choices occurs in even the regions with relatively abundant water resources in order to respond to the change in relative output prices caused by water shortages. We found that although the losses in production values are not quite large despite water shortages due to the price feedbacks, the loss in GDP is substantial. We show that our combined approach has advantages in deriving region and product specific production effects as well as the overall GDP loss effect of water shortages.

Climate Change Impacts on Agricultural Water in Nakdong-river Watershed (기후변화에 따른 낙동강 유역 농업용수 영향 분석)

  • Jee, Yong-Keun;Lee, Jin-Hee;Kim, Sang-Dan
    • Journal of The Korean Society of Agricultural Engineers
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    • v.54 no.3
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    • pp.149-157
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    • 2012
  • For the systemic management and planning of future agricultural water resources, deriving and analyzing the various results of climate change are necessary to respond the uncertainties of climate change. This study assessed the impact of climate change on the rainfall, temperature, and agricultural water requirement targeting in the Nakdong-river's basin periodically according to socioeconomic driving factors under the scenarios A1B, A2 and B1 of the Special Report on Emission Scenarios (SRES) through the various IPCC GCMs. As a result of future rainfall change (2011~2100), increasing or decreasing tendency of rainfall change for future periods did not show a clear trend for three rainfall observatories, Daegu, Busan and Gumi. The characteristics of the temperature change consistently show a tendency to increase, and in the case of Daegu observatory, high temperature growth was shown. Especially, it was increased by 93.3 % in the period of future3 (2071~2100) for A2 scenario. According to the scenario and periodic analyses on the agricultural water demand, which was thought to be dependent on rainfall and temperature, the agricultural water demand increased at almost every period except during the Period Future1 (2011~2040) with different increase sizes, and the scenario-specific results were shown to be similar. As for areas, the agricultural water demand showed more changes in the sub-basin located by the branch of Nakdong-river than at the mainstream of the River.

Assessment of Upland Drought Using Soil Moisture Based on the Water Balance Analysis (물수지 기반 지역별 토양수분을 활용한 밭가뭄 평가)

  • Jeon, Min-Gi;Nam, Won-Ho;Yang, Mi-Hye;Mun, Young-Sik;Hong, Eun-Mi;Ok, Jung-Hun;Hwang, Seonah;Hur, Seung-Oh
    • Journal of The Korean Society of Agricultural Engineers
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    • v.63 no.5
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    • pp.1-11
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    • 2021
  • Soil moisture plays a critical role in hydrological processes, land-atmosphere interactions and climate variability. It can limit vegetation growth as well as infiltration of rainfall and therefore very important for agriculture sector and food protection. Recently, due to the increased damage from drought caused by climate change, there is a frequent occurrence of shortage of agricultural water, making it difficult to supply and manage stable agricultural water. Efficient water management is necessary to reduce drought damage, and soil moisture management is important in case of upland crops. In this study, soil moisture was calculated based on the water balance model, and the suitability of soil moisture data was verified through the application. The regional soil moisture was calculated based on the meteorological data collected by the meteorological station, and applied the Runs theory. We analyzed the spatiotemporal variability of soil moisture and drought impacts, and analyzed the correlation between actual drought impacts and drought damage through correlation analysis of Standardized Precipitation Index (SPI). The soil moisture steadily decreased and increased until the rainy season, while the drought size steadily increased and decreased until the rainy season. The regional magnitude of the drought was large in Gyeonggi-do and Gyeongsang-do, and in winter, severe drought occurred in areas of Gangwon-do. As a result of comparative analysis with actual drought events, it was confirmed that there is a high correlation with SPI by each time scale drought events with a correlation coefficient.