• 농업생명과학연구
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• 제45권6호
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• pp.237-249
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• 2011

본 연구에서는 농촌 소하천의 적정 환경유지용수 산정을 위한 기초조사로 경상남도 고성군 하이면 와룡리에 위치한 봉현저수지를 수원으로 하는 봉현천과 하이저수지를 수원으로 하는 석지천을 대상으로 시기적 우기이면서 농번기인 2010년 5월에서 10월까지 총 6회에 걸쳐 18개 지점을 선정하여 하천조사 및 유량 모니터링을 실시하였다. 그 결과 선행 강수량이 많을 경우 하천의 전 구간에 유량이 증가하였고, 선행 강수량이 적거나 없는 경우에는 계측이 불가능할 정도로 하천이 메말라 있었다. 각 하천의 상류부의 경우에는 항시 일정량의 유량을 확인 할 수 있었는데 이는 댐 침윤에 기인한 것으로 추정되었다. 유량 프로파일을 작성한 결과 봉현천 하류부 2,000 m 지점과 3,500 m 지점, 석지천 하류부 1,200 m 지점에서 주변 참다래 과수원의 관개용수 양수, 참다래 보관 및 선별공장에서의 취수 및 관측지점 상류부의 연속적인 보의 영향으로 유량이 감소하는 것을 확인할 수 있었고, 봉현천 하류부 4,200 m 지점에서는 유량이 증가하였는데 이는 배수로를 통한 유출수의 유입에 의한 것으로 추정되었다. 향후 지속적이고 장기적인 현장 모니터링을 통하여 농어촌환경용수 공급을 위한 적정 유지유량을 산정하는데 기초자료로 활용할 수 있을 것으로 사료된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제17권2호
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• pp.37-46
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• 2012

This study was conducted to identify groundwater recharge and discharge amounts of a representative urban-rural composite area located in Yongin city, Kyounggi-do, Korea. Groundwater recharge would be affected by mainly two processes in the study area: rainfall and leakage from public water pipelines including water-supply and sewage system. Groundwater recharge rate was estimated to be 13.5% by applying annual groundwater level data from two National Groundwater Monitoring Stations to the master regression curve method. Subsequently, the recharge amounts were determined to be $13,253{\times}10^3m^3/yr$. Leakage amounts from water-supply and sewage system were estimated to be $3,218{\times}10^3$ and $5,696{\times}10^3m^3/yr$, respectively. On the whole, a total of the recharge amounts was $22,167{\times}10^3m^3/yr$, of which 60% covers rainfall recharge and 40% pipeline leakage. Groundwater discharge occurred through three processes in the composite area: baseflow, well pumping, and discharge from urban infrastructure including groundwater infiltration into sewage pipeline and artificial extraction of groundwater to protect underground facilities from submergence. Discharge amounts by baseflow flowing to the Kiheung agricultural reservoir and well pumping were estimated to be $382{\times}10^3$ and $1,323{\times}10^3m^3/yr$, respectively. Occurrence of groundwater infiltration into sewage pipeline was rarely identified. Groundwater extraction amounts from the Bundang subway line as an underground facility were identified as $714{\times}10^3m^3/yr$. Overall, a total of the discharge amounts was determined to be $2,419{\times}10^3m^3/yr$, which was contributed by 29% of artificial discharge. Even though groundwater budget of the composite area was identified to be a surplus, it should be managed for a sound groundwater environment by changing deteriorated pipelines and controlling artificial discharge amounts.

• 한국농공학회논문집
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• 제60권5호
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• pp.1-15
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• 2018

This study aims to effective survey on actual condition for impact and vulnerability assessment on climate change in agriculture and rural community (limited to rural water and agricultural infrastructure, Paragraph 3, Article 2 of the Rearrangement of Agricultural and Fishing Villages Act) entrusted to Korea Rural Community Corporation based on the Law (Paragraph 2, Article 47 of the Framework Act on Agriculture, Rural community and Food industry). The results are summarized as follows. The rural water was divided into three categories (abnormal climate, water use, and flood control), and 31 indicators were selected. The reservoirs were divided into four categories, and 20 indicators were selected. The pumping stations were divided into two categories, 7 indicators, and the drainage pump stations were divided into two categories, 5 indicators were chosen. A survey on actual condition of each indicator was conducted and the result of the impact assessment was calculated. The 65 rural water showed values ranged from 0.855 to 1.308. The reservoir ranged from 0.966 to 23.338 as a result of the impact assessment on the 16 indicators. The pumping station was able to calculate the results of the safety inspection and the thorough safety inspection, and the drainage pump station was able to calculate only the result of the safety inspection. It is judged that it will be necessary to secure and analyze data on indicators with no data in the future. The results of this research can be utilized as baseline data that can deal with climate change preemptively.

• 지질공학
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• 제2권1호
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• pp.70-91
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• 1992

제주도와 오아후섬의 지질은 제3기말에서 제4기초 사이에 걸친 화산활동에 의해 형성된 동일형의 화산도라는 점에서 유사한 특성을 갖는다. 이 두 섬의 지하수 산상은 두가지의 기본적인 요소인 화산암의 투수성과 강수량의 지배를 받는다. 그러나 오아후도에서의 지하수 산상은 광역 화산암의 복합 암맥군에 의해 더 많은 영향을 받는다. 제주도와 오아후도의 지하수 부존형태는 두가지로 분류되는데 고지대의 주수와 해안변에 발달된 기저 지하수가 그것이다. 일반적으로 제주도 지하수의 수질은 생활용수로 적합하나 동부 해안지역의 몇개의 지하수 관정은 과잉양수로 인하여 해수가 침입되었으며 1970년 부터 내륙쪽으로 점점 해수의 영향을 받고 있다. 이러한 해수의 오염현상은 오아후섬의 진주만에서도 비슷하다. 제주도의 신선한 지하수체에 현재 발생되고 있는 이러한 해수오염을 방지하기 위해서는 우선 해안지역을 따라 분포하는 지하수 부존 가능성과 그들을 최대한으로 개발하기 위해 지하수의 유동에 대한 연구가 필요하다.

• 한국농공학회논문집
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• 제62권2호
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• pp.53-62
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• 2020

The purpose of this study is to estimate the channel water loss of agricultural water supply in the command areas belong to Yechon irrigation channel of Gyeongcheon reservoir located Mungyeong-si, which area experienced a severe drought in 2015. The channel water loss was estimated by comparison of the irrigation water requirements (IWR) and agricultural water supply of the field data from 2012 to 2015. Further analysis was conducted to define the conveyance loss estimated based on the leakage holes and illegal pumping spots investigated through the field survey, and the distribution loss obtained by subtracting conveyance loss from the channel water loss. The annual rainfall decreased gradually, but the contribution of effective rainfall, available rain water to crop, increased to IWR during the study period. These phenomena resulted in the increase of agricultural water supply, and hence made greater the channel water loss simultaneously. The average channel water losses estimated as 36.8 % with 7.1 % of the conveyance loss and 29.7 % of distribution loss respectively. The distribution loss seems to be related to total number of rainy days, and irrigation schedules, while the conveyance loss was caused by irrigation channel aging conditions and illegal intake problems. In order to achieve sustainable agricultural water resources, the channel water loss needs to be reduced through the restoration of aged irrigation facilities and effective water managements in the fields.

• Tribology and Lubricants
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• 제25권6호
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• pp.387-398
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• 2009

The operation condition of recently designed pistons for high power and high speed diesel engine become more severe due to the increment of combustion pressure and temperature. So, in order to overcome high temperature, the application of the mono-metal cast aluminum alloy piston featuring an enclosed cast-in open cooling gallery has increased. In this research, it is developed a PCJ (piston cooling jet) rig tester, described the test procedure and validated the performance of sample piston cooling gallery design. Then the test rig will be used for developing the design technology of piston cooling gallery. The test rig is composed with oil reservoir and pumping system, oil jet system, piston fixing and moving system, collecting oil measuring system, and data measuring and recording system. It will be measured collecting efficiencies under conditions of a few piston positions, oil jet pressures and oil viscosities for a piston cooling gallery. Furthermore, the PCJ rig tester will be used for the optimum design of the oil cooling gallery which being applied to increase the cooling efficiency of pistons in diesel engines satisfying the EURO V emission regulation and the more.

• 대한기계학회논문집B
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• 제37권9호
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• pp.837-845
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• 2013

공기부양 펌프는 액체 내 공기부양 효과에 의해 양수 조작이 어려운 액체 및 액체 내의 침전물을 손상 없이 토출할 수 있는 장점을 가지고 있다. 이러한 장점을 이용하여 DCFC(Direct Carbon Fuel Cell)에서 고온의 용융된 연료를 혼합 및 순환시키기 위해 공기부양 펌프를 적용할 수 있다. 이를 위한 연구의 일환으로 공기부양 특성을 파악하기 위한 기초 실험을 수행하였다. 본 실험에서는 공기부양 펌프 시스템을 구축하여 저수통 내에 모사 액체로 물을 채우고 관(tube)을 삽입한 후, 관 하단부에 가스유량을 공급하여 상단부의 토출유량을 측정하였다. 설계 인자로서 관직경과 잠수비를 변경하면서 이에 맞는 공기유량을 공급하였고, 정해진 각 조건에서 생성된 관 내부의 기포(bubble) 형상을 디지털 카메라로 촬영, 그 형상을 네 단계로 구분하였다. 펌프의 성능을 이론식을 모델링하여 실험 데이터와 비교하였고, 토출 유량을 측정하여 물이 토출되는 시작점인 가스유량과 전체 유량비와의 상관관계를 분석하였다.

• 대한토목학회논문집
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• 제38권1호
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• pp.29-39
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• 2018

본 연구에서는 IPCC에서 제시한 기후변화 취약성 평가 이론, OECD에서 개발한 PSR 모형, EEA에서 개발한 DPSIR 모형을 활용하여 산정된 홍수위험지수들의 적용성을 분석하였다. 홍수위험지수 산정을 위하여 세부 지표로 일 최대 강수량, 1시간 최대 강수량, 10분 최대 강수량, 연평균 강수량, 1일 강수량이 80mm 초과한 일수, 인구 밀도, 자산 밀도, DEM, 도로연장, 하천개수율, 유수지용량, 하수도 보급률, 배수펌프시설 등의 2000년에서 2015년도 자료를 정규화하여 전국 113 중권역 단위로 구축하였다. 산정된 홍수위험지수는 4개의 홍수피해유형 즉 인명피해, 피해면적, 피해액, 피해빈도와 비교 분석하였다. 홍수위험지수와 피해유형별 상관분석 결과 피해액, 인명피해 및 피해면적에 대해서는 PSR 기법이, 홍수발생빈도에 대해서는 DPSIR 기법에 따른 지수의 적용성이 높은 것으로 나타났다.

• 자원환경지질
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• 제11권3호
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• pp.99-108
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• 1978

The Gum-Ho river basin is one of the densely populated area having more than 35% of the total population and it was also well irrigated since earlier days in the Nackdong river basin. Most of the easily developed source of surface water are fully utilized, and at this moment the basin is at the stage that no more :surface water can be made available under the present rapid development of economic condition. Since surface water supplies from the basin have become more difficult to obtain, the ground water resources must be thoroughly investigated and utilized greatly hereafter. In economic ground of the basin what part could ground water play? In what quantities and, for what uses could it be put? The answer to these questions can be relatively simple;the ground water resources in the basin can be put at almost any desired use and almost anywhere in the basin The area of the basin is at about $2088km^2$ in the middle part of Nackdong river basin and it is located along the Seoul-Pusan express highway. The mean annual rainfall is about 974.7mm, most of which falls from June to September during the monsoon. Accumulated is appeared approximately after every 8 year's accumlated dry period with the duration of 5 years. The water bearing formation in the basin include unconsolidated alluvial deposits in Age of Quaternary, saprolite derived from weathered crystalline rocks, Gyongsang sedimentary formations of the period from late Jurassic to Cretaceouse, and igneouse rocks ranging of the Age from Mesozoic to Cenozoic. The most productive ground water reservoir in the basin is calcareous shale and sandstones of Gyongsang system, which occupies about 66% of the total area. The results of aquifer test on Gyongsang sedimentary formation show that average pumping capacity of a well drilled into the formation with drilling diameter and average depth of $8{\frac{1}{2}}$ inch and 136m is $738m^3/day$ and also average specific capacity of those well is estimated $77.8m^3/D/M$. Total amount of the ground water reserved in the basin is approximately estimated at 37 billion metric tons, being equivalent 18 years total precipitations, among which 7 billion metric tons of portable ground water can be easily utilized in depth of 200 meters.

• 농촌계획
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• 제25권1호
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• pp.75-87
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• 2019

As the impacts of climate change have been emerged all the way through society, the potential risks specifically on agricultural water and facilities are recently getting concerned. Evaluating vulnerability of agriculture to climate change on is a time-tested strategy. While a number of researches on the adaption and mitigation of climate change were performed in various aspects for sustainable agricultural production, the vulnerability of management system for agricultural water and infrastructure has not been investigated yet. This study is aimed to clarify the definition of vulnerability to climate change, find the major indicators able to presume the vulnerability, and finally determine the relative importance of the indicators based on the specialist questionnaire survey and its analyses. The lists of indicators for major parts of agricultural water management such as, water use, flood control, reservoir related issues, and pumping and drainage systems are initialized referring to the related precedent studies. The primary survey was conducted in the form of Delphi to complement the list and methods and the main survey was then conducted using AHP(Analytic Hierarchy Process) technique to quantitatively prioritize the indicators. The results derived in this study would be directly adopted in weighting importance of indicators to investigate the indicator-based vulnerability analysis to climate change in agricultural water and infrastructure management.