• 한국농공학회:학술대회논문집
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• 한국농공학회 1998년도 학술발표회 발표논문집
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• pp.41-46
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• 1998

The purpose of the study was changed of Flood Characteristics in Down stream of Keum River by the Keum River Estuary Dam Construction. The water surface slope of Kuem river after the Keum River Estuary Dam construction was steeper then before. The flood control capacity increase after construction. But, Increasing sediment in Kuem river will be decreased flesh reservoir volume for yield irrigation.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2001년도 학술발표회 발표논문집
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• pp.89-92
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• 2001

This study was to analyse the correlations between pumping rate to irrigated area and rainfall amount in the Geum river basins. A total of 84 pumping stations and field data from the paddy of 28,772 ha were introduced to the analysis. The results showed that the pumping volume was highly correlated to the rainfall during the irrigation period and irrigated area. But, it was difficult to determine the exact correlation factors, because of the lack of data like the efficiency of water in the paddy field.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2023년도 학술발표회
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• pp.36-36
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• 2023

Sedimentation is a natural process that occurs in all reservoirs. Sedimentation problem reduces the storage capacity of the reservoir and limits its ability to provide water for various uses, such as irrigation, hydropower generation, and flood control. Therefore, predicting reservoir sedimentation is important for ensuring the efficient operation and sedimentation management of a reservoir and . In this study, the HECRAS model was applied to predict longitudinal distribution of deposited sediment in the Pleikrong reservoir to 2050. Different scenarios was considered: (i) no climate change, (ii) climate change (under two emissions scenarios, RCP4.5 and RCP8.5), and (iii) climate change and land use change (followed land use planning of the watershed). The computation results with different scenarios were analyses and compared. The results show that the reservoir reduced storage volume's rate and sedimentation proceed toward to the dam in the case of climate change is faster than in the case of no climate change. Analyses also indicates that following the land used planning could also improve the long-term problem of the reservoir sedimentation. The outcomes of this study will be helpful for a sustainable plan of sediment management for the Pleikrong reservoir.

• 아시안잔디학회지
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• 제25권1호
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• pp.79-88
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• 2011

본 연구는 염해지 토양을 기반으로 조성된 모래 지반구조에서 켄터키 블루그래스의 염해 경감을 위한 관수량 및 관수용수의 염 수준 설정에 관한 정보를 얻고자 수행되었다. 시험에 사용된 용기는 바닥에 10 cm 높이로 간척지 논토양을 설치 하였으며, 그 위에 20 cm 높이로 염류 차단을 위해 왕사를 설치하였다. 상토는 20 cm 높이로 세사를 설치 하였으며, 세사에 유기물이 부피비로 5%가 되도록 혼합하여 조성하였다. 상기 용기들은 전기전도도(ECw)가 3-5 $dSm^{-1}$ 수준인 물에 5 cm 깊이로 침지 처리하였다. 조성된 용기에 켄터키 블루그래스 멧장을 식재하였다. 관수용수의 염처리는 전기전도도가 각각 0, 2 and 3 $dSm^{-1}$의 농도로 수행되었다. 관수량은 켄터키 블루그래스의 일 증발산량 대비 70% (3.8 mm $day^{-1}$), 100% (5.7 mm $day^{-1}$), 그리고 130% (7.6 mm $day^{-1}$)의 3처리로 하였다. 관수는 3일 간격으로 수행하였다. 상토내 염류의 축적은 관수용수와 모세관 현상에 따른 염 집적이 원인이 되었다. 시험 2차년도 조사시 관수용수의 처리 농도(ECw)가 0, 2, 3 $dSm^{-1}$ 일 때 각 상토의 전기전도도는 (ECe) 3.86 $dSm^{-1}$, 4.7 $dSm^{-1}$ 그리고 5.1 $dSm^{-1}$ 수준으로 조사되었으며, SAR은 19.2, 23.9, 27.5로 조사되었다. 관수 량의 경우는 염이 포함된 물을 증발산량의 100%와 130% 살포시는 켄터키 블루그래스 재배 토양내 ECe와 SAR 경감 효과는 없었다. 그러나 실험 1년 차의 경우 관수량이 증가할수록 켄터키 블루그래스의 생육량은 증가되었다. 2년차 조사에서는 켄터키 블루그래스의 생육이 염농도에 영향을 받는 것으로 조사되었다. 수돗물에 (0 $dSm^{-1}$) 비해 전기전도도가 2와 3$dSm^{-1}$인 물을 관수시 가시적 품질이 각각 3.2%, 16.5% 감소하는 결과를 보였으며, 예지물의 건물중은 각각 6.4%, 39.3%가 감소하는 결과를 보였다. 또한 뿌리 건물중은 각각 5.5%, 5.0% 감소하는 결과를 보였다.

• 한국농공학회논문집
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• 제61권4호
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• pp.55-61
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• 2019

Motor pumps cannot be used in those areas where electricity is not accessible such as remote rural areas in many African countries. Hydraulic ram pump is one of the solutions for supplying water for irrigation or domestic uses. The hydraulic ram pumps are working based on the water hammer effect for pumping without external power or electricity. This study was conducted to investigate the effect of air chamber volume and operation parameters on the performance of the hydraulic ram pump which was assembled with common plumbing parts. The experimental results showed the volume of the air chamber did not affect the performance such as discharge rate and head. When drive heights were 1.7 and 2.35 m, the maximum discharge heads were up to 7 m and 10 m, respectively. When the air chamber volume was 1 L, discharge rates were 0.23 and 2.12 L/min under the drive heights of 1.7 and 2.35 m, respectively. The average energy efficiency of the hydraulic ram pump assembled in this study was about 60% for all the experimental conditions.

• 한국농공학회논문집
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• 제56권3호
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• pp.65-74
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• 2014

Water footprint is defined as the total volume of direct and indirect water used to produce a good and service by consumer or producer, and measured at the point of production based on virtual water concept. The green and blue water footprint refers to the volume of the rainwater and the irrigation water consumed, respectively. Crop water footprint is expected to be used as the basic data for agricultural water resources policies at production, consumption and trade aspect. Thus, it is necessary to estimate suitable green and blue water footprint for South Korea. The objective of this paper is to quantify the green and blue water footprint and usage of upland crops during the period 2001-2010. To estimate the water footprint, 43 upland crop production quantity and harvested area data were collected for 10 years and FAO Penman-Monteith equation was adopted for calculating crop water requirement. As the results, the water footprint of cereals, vegetables, fruits and oil crops accounted for 1,994, 165, 605, and 4,226 $m^3/ton$, respectively. The usage of water footprint for crop production has been estimated at 3,499 (green water) and 216 (blue water) $Mm^3/yr$ on average showing a tendency to decrease. Fruits and vegetables have the largest share in the green water usage, consuming about 1,200 and 1,060 $Mm^3/yr$ which are about 65 % of gross usage. The results of this study are expected to be understood by the agricultural water footprint as well as by the total water footprint from both a production and consumption perspective in Korea.

• 한국토양비료학회지
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• 제45권5호
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• pp.717-724
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• 2012

Salt accumulated soil should be reclaimed to lower salt level for crop production. This study was carried out to investigate the characteristics of water flow and transport of mono and divalent solutes on salt accumulated soils with different head pressures. Saturated hydraulic conductivity was measured by constant and falling head methods with maintaining different head pressures. Saturated hydraulic conductivity was influenced by bulk density and organic matter contents in soils, but it had different elusion patterns between saline and sodic soil. While the quantity of water necessary for reclamation could be varies with soil type, it was considered that the supply of one pore volume of water was affordable and economic. Additional head pressure significantly increased the volume of leachate at a given time and it was more effective at low organic matter soils. The results indicate that additional head pressure would be one of the best irrigation practices on desalination method for salt accumulated soils.

• 한국조경학회지
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• 제45권1호
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• pp.28-34
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• 2017

본 연구는 실내에 많이 사용되는 목본식물인 산호수(Ardisia pusilla), 클루시아(Clusia rosea), 팔손이(Fatsia japonica), 인도고무나무(Ficus elastica)를 대상으로 관수주기에 따른 식물생육 상태를 측정하여 향후 실내 환경개선에 도움이 되는 조경식물의 적절한 관수주기를 구명하고자 수행하였다. 목본식물 4종을 10cm 포트에 식재하여, 관수주기를 2회/1주, 1회/1주, 1회/2주의 3수준으로 하여 120일 동안 처리한 후, 초고, 생체중, 건조중, SPAD, 엽색, 엽수분포텐셜, 엽록소 형광(Fv/Fm), 광합성율을 측정하였다. 실험기간 동안 평균 토양수분함량은 2회/1주 $48.8{\pm}2.1%$, 1회/1주 $25.2{\pm}4.4%$, 1회/2주 $10.3{\pm}2.4%$ 순으로 나타났다. 2회/1주 관수 시 산호수는 엽수분포텐셜이 높게 나타났고, Fv/Fm이 0.731로 나타나 과습에 대한 스트레스를 보였다. 1회/2주 관수 시 산호수, 팔손이, 인도고무나무의 광합성율은 유의성이 없어 클루시아에 비해 건조에 민감한 것으로 나타났다. 1회/1주 관수하여 평균 토양수분함량이 25%일 때 본 실험에 사용된 4종 목본식물 모두 실내 생육이 원활한 것으로 나타나 실내조경용으로 이용성이 높을 것으로 판단된다.

• 농업과학연구
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• 제27권2호
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• pp.125-134
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• 2000

This observation was to investigate the influence of raw organic matter incorporated into soil at various rates on hydraulic conductivity and elution of solute throughout soil column. Generally the organic matter content in a practical agricultural field was approximately 3%. However, the application rate of organic matter in the field tends to rapidly increase in these days. Therefore, we raised the application rate of organic matter up to 10% in this investigation. From the experiment, we found that the hydraulic conductivities rapidly decreased with increasing rate of organic matter as well as rapid decrease in total volume of eluent during the same period. And electrical conductivities in the effluent significantly decreased after 2 pore volume, resulting in approaching to the criteria of saline soli. From this we could assume that the organic matter may influence the crop growth in the beginning. However excessive irrigation in the field may cause saturation of soil leading to reduction of soil. Therefore, there must be a management methods in application of organic matter with respect to soil water control.

• 한국농공학회논문집
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• 제65권2호
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• pp.21-33
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• 2023

While the main purpose of irrigation reservoirs is to supply agricultural water, the needs of environmental flow and flood control has been expanded. The agricultural reservoirs have been operated in the form of carry-over system until now. Therefore, the supply of agricultural water is difficult when the storage rate is not sufficiently secured after large volume of irrigation. In addition, there are regulation of the upper storage rate for some large reservoirs during the flood season, but lower storage rate is not regulated. Accordingly, this study aims to evaluate the capacity of agricultural water and environmental flow supply by setting the management lower storage rate of reservoir. The changes in the supply of agricultural and environmental flow was simulated according to the three different regulating lower storage rate scenarios. As a result, it was judged effective in terms of water supply managing the lower storage rate up to 30% when the initial storage rate of farming period is above annual average for the Naju reservoir considering existing water management practice. If the lower storage rate would have been controlled above 30%, the supply of agricultural water might be increased and non-effective discharge amount would be decreased compared to other scenarios during dry period of 2016-2018.