• KCID journal
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• v.10 no.1
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• pp.80-88
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• 2003

The pumping efficiency of small size tube wells was investigated in the rural area. The pumping characteristic curve is constructed to estimate the pumping rate of small size tube wells for irrigation. The pumping rates from the characteristic curve highl

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.50-50
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• 2023

농업용수는 우리나라 수자원 사용량 중 약 61%를 차지하고 있으며, 효율적인 수자원 관리를 위한 핵심적인 관리목표 중 하나이다. 논으로 공급되는 관개용수는 필지에서의 증발산량 및 침투량과 용배수로를 통한 자연적 및 인위적인 배수량으로 소비된다. 관개회귀수량 (irrigation return flow)은 관개를 통해 농경지에 공급된 수량 중 증발산에 의해 소비되지 않고 침투 또는 배수 등을 통해 하천으로 회귀되는 수량이다. 관개회귀수량 및 회귀율은 농업용수 물순환 관리에 중요한 역할을 하며, 관개용수 사용량 결정, 합리적인 용수의 공급과 수요 관리계획 및 수질 관리계획 등에 중요한 요소로 작용한다. 하지만, 기상, 작물, 토양 등의 물리적 요소와 농업용수 공급량, 물꼬 조절, 담수심 관리 방식 등 인위적 요소의 영향을 동시에 받기 때문에 그 기작이 복잡한 특징을 갖는다. 따라서, 합리적인 수자원 개발 계획 및 관리를 위해 정확한 관개회귀수량 추정 연구가 필수적이다. 본 연구에서는 전국 4대강 (한강, 금강, 낙동강, 영산강·섬진강) 권역 중심의 9개 대상지구를 선정하였으며, EPA-SWMM (Environmental Protection Agency-Storm Water Management Model) 모델 기반 수로 네트워크 모의를 활용한 수원공 단위 관개회귀수량을 산정하고자 한다. EPA-SWMM 모의 시 공급량은 농업기반시설관리시스템 (Rural Infrastructure Management System, RIMS) 저수율 자료와 수원공 단위용수량을 활용하였으며, 모의결과 시점부 공급량 및 배수량과 강수량, 증발산량 및 침투량을 활용하여 신속회귀수량과 지연회귀수량을 추정하였다. 본 연구 결과는 최적 농업용수 공급방안에 대한 기초자료 구축에 활용 가능할 것으로 사료된다.

• Economic and Environmental Geology
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• v.6 no.4
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• pp.231-233
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• 1973

1. 칠레의 중앙(中央)에 위치(位置)한 리오-아콘카우와 계곡(溪谷)은 600m 심도(深度)의 충적층(沖積層)으로 형성(形成)되어 있음. 2. 계곡(溪谷)의 물관리구역(管理區域)은 4 개구역중(個區域中) 3 개구역(個區域)에 걸쳐 있음. 3. 주요농업관개지역(主要農業灌漑地域)으로서 차카부퀴토에서 태평양연안(太平洋沿岸)까지의 거리(距離)는 113km가 됨. 4. 관개(灌漑)는 9 월(月)부터 5 월(月)사이에 도수로(導水路)와 관정(管井)에 의(依)하나 용수불족(用水不足)으로 저수지(貯水池)와 지하수개발(地下水開發)이 구상(構想)되었음. 5. 디지탈 모델 시험(試驗)은 제(第) 3 관리구역내(管理區域內) 약(約)7km의 거리(距離)의 히주에라스구간(區間)에서 이루어졌었음. 6. 시험결과(試驗結果) 가. 하천(河川)과 대수층(帶水層)과의 관련성(關聯性) 나. 다각도(多角度) 관개용수(灌漑用水)로 인(因)한 하천(河川)과 지하수(地下水) 저류(貯溜)의 효율성(效率性)의 확인(確認). 다. 지하수(地下水) 양수(揚水)에 의(依)한 지하수(地下水) 저류량(貯留量)의 감소(減少)와 라. 하천(河川)에의 재유입수량(再流入水量)이 관개(灌漑) 종료시(終了時)나 직후(直後)에 최대치(最大値)였음. 마. 리오 아콘카우와 계곡(溪谷)에 대(對)한 모델시험(試驗)을 제안(提案)하여 a) 장차(將次) 지하수개발(地下水開發)의 효과(效果)를 분석(分析)하고 b) 제안(提案)된 저수지(貯水池)의 효율(效率)과 c) 수자원(水資源)의 적절(適切)한 이용계획(利用計劃)을 수립(樹立)토록 하였음.

• Magazine of the Korean Society of Agricultural Engineers
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• v.32 no.3
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• pp.67-78
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• 1990

A decision support system, Daily Irrigation Network Operation Simulation model (DINOPS) was developed that can adequately describe the physical behavior of an irrigation system. The model is to depict the physical features of complex water allocation schemes of the irrigation system and to simulate the response of the system to different irrigation schemes. The model was validated on the Banweol irrigation district by comparing the simulated canal discharges and paddy water levels with the field data. The operation of the DINOPS model was demonstrated on the irrigation district where several irrigation management practices were evaluated with computing irrigation efficiencies and rainfall effectiveness respectively. The model sensitivity with respect to heights of bund and block diversion rates were analyzed and discussed.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.5
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• pp.540-545
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• 2010

This study was conducted to investigate effects of irrigation points on cucumber growth and water saving under greenhouse. Automatic irrigation system and tensiometers were installed at four plots to measure soil water tension and properties of irrigated water. Each plot was irrigated at different irrigation points; soil water tension of 15, 20, 30, and 40 kPa, respectively. Conventional irrigation plot without tensiometer was also investigated. The total yield and sugar contents of cucumber had no significant differences between plots. However, irrigated water volumes were saved most when irrigation points were 30, and 40 kPa. The two plots of 30, and 40 kPa treatments used about 60% less of irrigated water than the plot of conventional practice did. In conclusion, this research suggested that the optimum irrigation point for cucumber cultivation in greenhouse can be soil water tension of 30 kPa based on the results of overall cucumber quality, and Greenhouse water usage.

• Journal of Appropriate Technology
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• v.6 no.2
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• pp.136-145
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• 2020

Agriculture is the backbone of the economy of most developing countries. In these countries, agriculture or farming is mostly done manually with little integration of machinery, intelligent systems and data monitoring. Irrigation is an essential process that directly influences crop production. The fluctuating amount of rainfall per year has led to the adoption of irrigation systems in most farms. The absence of smart sensors, monitoring methods and control, has led to low harvests and draining water sources. In this research paper, we introduce a 433 MHz Radio Frequency and 2G based Smart Irrigation Meter System and a water prepayment system for rural areas of Tanzania with no reliable internet coverage. Specifically, Ngurudoto area in Arusha region where it will be used as a case study for data collection. The proposed system is hybrid, comprising of both weather data (evapotranspiration) and soil moisture data. The architecture of the system has on-site weather measurement controllers, soil moisture sensors buried on the ground, water flow sensors, a solenoid valve, and a prepayment system. To achieve high precision in linear and nonlinear regression and to improve classification and prediction, this work cascades a Dynamic Regression Algorithm and Naïve Bayes algorithm.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.67 no.3
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• pp.147-154
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• 2022

This study was conducted by directly sowing Asemi in late April at 30 × 10 cm intervals to determine the optimal irrigation method and irrigation amount to maximize the use of limited agricultural water and to increase the yield when growing rice in a desert climate. Conventional irrigation (Conv.), surface drip irrigation (Sur), subsurface drip irrigation (Sub.), and sprinkler irrigation (Spr.) methods were used. The following amounts of irrigation were tested based on field capacity (0.33 bar): 80% (V/V, FC80), 100% (FC100), and 120% (FC120), and data for 2 years were averaged. The total amount of irrigation by irrigation method was the lowest, at 627 ton/10 a, for Sub. irrigation with the FC80 treatment, which was 60.4% less than the amount of irrigation with the FC120 treatment (1,584 ton/10a). Sub. irrigation with the FC120 treatment gave the greatest amount of rice, at 665 kg/10 a, and this condition obtained a yield of 88.1% (754 kg/10 a) of the yield obtained with the conventional treatment. Therefore, when planting rice in a desert climate, subsurface drip irrigation at 120% of field capacity is considered advantageous to increase water use efficiency and crop yield.

• Proceedings of the Korea Water Resources Association Conference
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• 2003.05b
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• pp.711-714
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• 2003

• KCID journal
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• v.6 no.1
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• pp.31-38
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• 1999

Recently, biofilm reactors have been considered as an efficient small scale sewage treatment system in Korean rural areas because of easy operation and cost effectiveness. The objective of this study was to select a more effective filter medium of the bio

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2003.04a
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• pp.6-14
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• 2003

북한의 식량 상황이 악화된 근본적인 원인은 생산 주체에 대한 인센티브 부족, 농업환경을 보면 경작지 면적이 전체 20% 정도로 낮고, 무상기일이 135-180일로 짧으며, 토양의 비옥도 저하, 삼림파괴로 인한 토양 유실증가, 가뭄, 홍수, 태풍과 같은 자연 재해가 계속되고 있다. 농업 구조적인 요인들로는 농업에 투입되는 에너지 부족(연료, 비료, 농약, 전기 등), 농업 기계화율 정도가 높았으나 노후화에 따른 예비 부품 부족으로 인한 활용률의 저하, 양질의 종자확보 부족, 갖추고 있는 관개 시설의 노후화로 인한 관개시설 활용과 관수 효율의 저하, 농산물 수확 후 수송과 저장 과정에서 손실증가 등을 들수 있다. (중략)