• 물과 미래
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• 제45권12호
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• pp.51-57
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• 2012

• 물과 미래
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• 제45권11호
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• pp.39-45
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• 2012

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.294-294
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• 2022

In 2013, the Asian Development Bank classified the Philippines among the countries facing high food security risks. Evidence has suggested that climate change has affected agricultural productivity, and the effect of extreme climatic events notably drought has worsened each year. This had resulted in serious hydrological repercussions by limiting the timely water availability for the agriculture sector. Laguna is the 3^rd most populated province in the country, and it serves as one of the food baskets that feed the region and nearby provinces. In addition to climate change, population growth, rapid industrialization, and urban encroachment are also straining the delicate balance between water demand and supply. Studies have projected that the province will experience less rainfall and an increase in temperature, which could simultaneously affect water availability and crop yield. Hence, understanding the composite threat of climate change for crop yield and water consumption is imperative to devise mitigation plans and judicious use of water resources. The water footprint concept elaborates the water used per unit of crop yield production and it can approximate the dual impacts of climate change on water and agricultural production. In this study, the water footprint (WF) of six main crops produced in Laguna were estimated during 2010-2020 by following the methodology proposed by the Water Footprint Network. The result of this work gives importance to WF studies in a local setting which can be used as a comparison between different provinces as well as a piece of vital information to guide policy makers to adopt plans for crop-related use of water and food security in the Philippines.

• 한국물환경학회지
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• 제26권3호
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• pp.439-445
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• 2010

An emergy analysis of the main energy flows driving the economy of humans and life support systems consists of environmental energies, fuels, and imports, all expressed as solar emjoules. Total emergy use (371 E20 sej/yr) of the Western Nakdong River Basin is 97 per cent from imported sources, fuels and goods and services. Emergy flows from the environment such as rain and geological uplift flux accounted for only 2.9 percent of total emergy use. Emergy yield ratio and environment loading ratio were 1.03 and 33.27, respectively. Emergy sustainability index, a ratio of emergy yield ratio to environment loading ratio, is therefore less than one, which is indicative of highly developed consumer oriented economies. It is necessary for an efficient management of Western Nakdong River Basin to reduce pollution load basically and to restructure economic activities into an environmental friendly industrial structure depending on renewable energy and resources.

• Geomechanics and Engineering
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• 제24권5호
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• pp.419-430
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• 2021

Investigation on the compressibility and shear strength of compacted loess is of great importance for the design and operation of engineering infrastructures in filling area. In this study, the mechanical behaviors of Yan'an compacted loess are investigated at various dry densities and water contents by conducting one dimensional compression and direct shear tests. And the elastic compressibility, plastic compressibility, yield stress and strength are obtained from the experiments. Results show that when water content increases, plastic compressibility parameter increases, but yield stress decreases. However, the increase of dry density leads to a decrease in plastic compressibility parameter but an increase in yield stress. In addition, elastic compressibility parameter is found to be a constant which is irrelevant to water content and dry density. As for strength, cohesion and internal friction angle is directly proportional to dry density, but inversely proportional to water content. Moreover, the mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM) tests were also performed to observe the pore size distribution and microstructure of the specimens. Finally, by using results of MIP and SEM tests, the compressibility and strength behaviours of Yan'an compacted loess are explained from the perspective of pore-size distribution and microstructure.

• 동아시아식생활학회지
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• 제13권5호
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• pp.439-446
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• 2003

단식 증류기를 이용한 증류식 소주는 품격 높은 향미를 지니고 있으나 희석식 소주에 비해 상대적으로 고가인 것이 문제로 지적되어 왔다. 이에 증류식 소주의 경제성 확보 방법의 하나로 담금에 전분액화법을 도입하여 급수 변화에 따른 수율 및 향미 연구를 실시하였다. 액화담금공정에 의한 발효경과는 pH, 알코올, 총산 등의 일반분석 결과 정상적이었다. 수율은 급수율과 정비례관계를 보였으며 급수율 250%가 가장 높았다. one-way ANOVA를 이용한 p<0.05 수준에서의 Duncan's multiple range test 결과에서 급수율 변화에 따른 유의적인 차이를 보이지 않았고, 게다가 profile법에 의한 관능 평가 결과를 heptadiagram으로 나타내었을 때에도 그 면적과 형태의 유사성에서 보여지는 바와 같이 급수율 변화에 따른 관능차는 거의 없었다. 따라서, 본 연구에서는 급수율 250%로 액화 담금한 것이 품질 차이 없이 가장 높은 수율을 보여 경제적으로 우수하였고 발효경과에서도 문제가 없어 최적의 담금 방법임을 알 수 있었다.

• 한국작물학회지
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• 제42권3호
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• pp.263-269
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• 1997

보리는 생식생장기에 수분 스트레스에 민감하게 반응하여 수량에 크게 영향을 준다. 보리 5품종 (겉보리 : 밀양 1002, 올보리, 두루보리, 쌀보리: 백동, 맥주보리: 향맥)을 공시하여 생식생장기에 해당되는 출수전 20일, 출수전 10일 및 출수기에 각각 10일간씩 단수처리를 하여 한발을 유발하였으며 처리 후에는 관수를 하여 정상적으로 재배하였다. 보리 품종들을 10월에 포장에 파종하여 익년 2월에 대형 폿트에 이식하여 재배하였으며, 건물중, 유효경비을, 간장, 수량 및 수량 구성요소를 조사하였고, 유리 proline함량과 상대팽압도를 측정하였다. 1. 한발에 의한 피해는 출수전 10일>출수기>출수전 20일 처리의 순으로 나타났으며, 출수전 10일 처리구의 경우 대조구에 비하여 간장은 85∼98%, 주당수수는 52∼83%, 일수립수는 71∼86%, 천립중은 80∼84%, 그리고 10주당 수량은 60∼94%를 나타내었다. 2. 출수 10일전 단수처理에서 수량 및 수량구성 요소들의 감소율이 가장 컸고, 수량구성요소 중에 주당수수와 일수립수가 비교적 한해에 민감하게 반응하였다. 3. 올보리>밀양 1002ㆍ두루보리>향맥>백동의 순으로 내한성이 약하였다. 4. 한발처리를 끝낸 후에 다시 관수하여 지엽의 유리 proline함량의 감소율과 상대팽압도의 회복율을 품종별로 보면 피맥 3품종이 높고 백동과 향맥이 매우 낮았다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2019년도 학술발표회
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• pp.185-185
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• 2019

Sustaining future wheat production is challenged by anthropogenically forced climate warming and drying led by increased concentration of greenhouse gases all around the globe. Warming stresses, originating from the elevated $CO_2$ concentration, are continuously reported to have negative impacts on wheat growth and yield. Yet, elevated $CO_2$ concentration, despite being disparagingly blamed for promoting warming, is also associated with a phenomenon called $CO_2$ enrichment; in which wheat yield can improve due to the enhanced photosynthesis rates and less water loss through transpiration. The conflicting nature of climate warming and $CO_2$ enrichment and their interplay can have specific implications under different environments. It is established form the field and simulation studies that the two contrasting phenomena would act severely in their own respect under arid and semi-arid environments. Wheat is a dietary staple for masses in Pakistan. The country's wheat production system is under constant stress to produce more from irrigated agricultural lands, primarily lying under arid to semi-arid environments, to meet the rapidly growing domestic needs. This work comprehensively examines the warming impacts over wheat yield and water productivity (WP), with and without the inclusion of $CO_2$ enrichment, under semi-arid environment of Punjab which is the largest agricultural province of Pakistan. Future wheat yields and WPs were simulated by FAO developed AquaCrop model v 5.0. The model was run using the bias-correction climate change projections up to 2080 under two representative concentration pathways (RCP) scenarios: 4.5 and 8.5. Wheat yield and WPs decreased without considering the $CO_2$ enrichment effects owing to the elevated irrigation demands and accelerated evapotranspiration rates. The results suggested that $CO_2$ enrichment could help maintain the current yield and WPs levels during the 2030s (2021-2050); however, it might not withhold the negative climate warming impacts during the 2060s (2051-2080). Furthermore, 10 - 20 day backward shift in sowing dates could also help ease the constraints imposed by climate warming over wheat yields and WPs. Although, $CO_2$ enrichment showed promises to counteract the adverse climate warming impacts but the interactions between climate warming and $CO_2$ concentrations were quite uncertain and required further examination.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.1255-1256
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• 2005

• 한국수자원학회논문집
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• 제46권2호
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• pp.183-193
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• 2013

수자원시스템의 설계공급량을 결정하기 위한 평가지표의 선택은 수자원기술자가 직면한 중요한 문제이다. 대부분 신뢰도, 회복도 그리고 취약도를 대상으로 평가하게 된다. 그러나 각 지표 간에는 중복성이 있고 회복도와 취약도는 용수공급 여건이 나빠져도 개선되는 증감현상이 나타날 수 있다. 실제 적용에서는 이와 같은 문제점을 인지하지 못하고 한번 계산된 추정치로 판단하는 경우가 대부분이다. 이런 현상에 대한 원인은 수자원시스템의 다양한 특성에 의해 나타나고 있는데 수문 및 수요의 계절적 변동성이 대표적이다. 본 연구에서는 우리나라 댐 설계시 일반적으로 적용하고 있는 신뢰도 지표에 추가하여 다기준 적용을 위한 회복도 및 취약도의 적용성을 분석하였다. 분석방법은 계절적 변동성이 큰 농업용수의 구성비율을 기준으로 7개댐을 선정하여 각 지표 간 상관성과 증감현상을 분석하였다. 분석 결과, 연중 일정량을 공급하는 용담댐은 일반적 추세를 보였으나 농업용수를 공급하는 충주, 안동 및 남강댐 등은 회복도와 취약도에서 증감현상이 뚜렷이 나타났다.