• 환경영향평가
• /
• 제15권6호
• /
• pp.407-415
• /
• 2006

This study carried out submerged area due to Dam construction in the near future. It includes species classification of plant, survey of community structure, examination of pollutant load and assessment of water quality impact. The vascular plants of this area are listed 224 taxa; 64 families, 168 genera, 193 species, 30 varieties and 1 form. This study area is classified into total 21 communities, most community was consist of grass vegetation. Among the communities, Erigeron annuus ($869,286m^2$, 22%) community was dominant and Erigeron annuus-Avena fatua comminity (16%) was subdominant until May, and then Erigeron canadensis community occupied most area to $1,774,985m^2$ (32%) from May to July. For the evaluation of water quality impact due to submerged macrophyte, nutrient release test was conducted both dead body macrophyte and living body macrophyte. The results of release test show that T-N is not released at dead body macrophyte, but it is released at living body macrophyte, especially living body Artemisia priceps var. orientalis shows 1.436mgN/g. At release test of dead body macrophyte, T-P release rate of Erigeron annuus shows 0.500mgP/g at the top of them and it also shows 0.436mgP/g at Erigeron annuus of living body macrophyte. T-N load of submerged macrophyte shows 0.76% by comparison of total load on watershed and T-P load of that shows 3.61%. In case of removal macrophyte for reduction of pollutant load in submerged area, T-N load of submerged macrophyte changes from 0.76% to 0.15% by comparison of total load on watershed and T-P load of that changes from 3.61% to 0.72%.

• 한국환경농학회지
• /
• 제32권1호
• /
• pp.9-16
• /
• 2013

주암호내 복내 저수구역에서 서식하는 자생식물체들이 침수시 주암호 수질에 미치는 영향을 파악하기 위하여 복내 저수구역이 침수되기 전인 2010년 8월의 영양염류(질소 및 인) 최대 흡수량과 침수 후 다시 침수이전 수위로 회복된 2011년 2월에 남은 식생의 영양염류 잔존량 차이를 이용하여 산술적인 영양염류 용출량을 산정하였다. 2010년 8월에 침수되기전 복내 저수구역내 식생의 면적은 987,872 $m^2$이었다. 침수전인 2010년 8월에 복내 저수구역내 식생의 분포면적별 T-N의 흡수량은 물억새가 247 kg/total reservoir area, 이삭사초가 11,340 kg/total reservoir area로 분포면적이 넓은 이삭사초의 T-N 흡수량이 물억새에 비해 많았으며, T-P의 흡수량도 1,231 kg/total reservoir area로 이삭사초가 가장 많았다. 침수 후 2011년 2월에 조사된 상부지역 물억새의 T-N 및 T-P의 잔존량은 각각 34 및 11 kg/total reservoir area로 침수 전에 비해 감소하였고, 이삭사초의 T-N 및 T-P의 잔존량은 각각 491 및 68 kg/total reservoir area로 물억새와 비슷한 경향으로 침수 전에 비해 감소하였다. 이상의 결과를 종합하여 복내 저수구역내 식생의 T-N 및 T-P의 총 용출량을 산정한 결과 T-N 용출량은 복내 저수구역 총 식생면적(987,872 $m^2$)당 12,212 kg, T-P 용출량은 총 식생면적당 1,324 kg이었다. 따라서 복내 저수구역내 자생식물은 침수시 수중에서 분해되면서 식물체내 질소 및 인이 용출되어 주암호의 수질오염을 가중시킬 수 있는 한 요인이 될 수 있으므로 호소내 수질개선을 위해서는 저수구역내 식물체의 관리방안이 필요할 것으로 판단된다.

• 한국막학회:학술대회논문집
• /
• 한국막학회 2000년도 침지형 분리막을 이용한 수처리 시스템 Water Treatment System Using Submerged Membranes
• /
• pp.15-41
• /
• 2000

• 한국토양비료학회지
• /
• 제16권1호
• /
• pp.36-41
• /
• 1983

가리염(加里塩)을 달리하여 투수조건하(透水条件下)에서 수도(水稻)를 재배(栽培)할때 논토양(土壤)에서 투수중(透水中)에 용탈(溶脫)되는 성분변화(成分変化)를 분석검토(分析検討)한 결과(結果)는 다음과 같다. 침투수(浸透水)의 pH는 염화(塩化)칼리구(区)가 황산(黃酸)칼리구(区)보다 약간 높았다. 석회(石灰), 마그네시움, 칼리, 암모니움과 같은 양(陽)이온의 용탈(溶脫)은 염화(塩化)칼리구(区)가 황산(黃酸)칼리구(区)보다 용탈(溶脫)이 약간 높았다. 인산(燐酸)의 용탈(溶脫)은 반대(反対)로 황산(黃酸)칼리구(区)가 염화(塩化)칼리구(区)보다 약간 용탈(溶脫)이 많았다. 철(鉄)의 용탈(溶脫)은 재배구(栽培区)가 높고 규산(硅酸)의 용탈(溶脫)은 무재배구(無栽培区)가 높았으나, 철(鉄), 규산(硅酸)의 용탈(溶脫)에 미치는 칼리염(塩)의 영향(影響)은 뚜렷하지 않았다.

• 신재생에너지
• /
• 제7권4호
• /
• pp.37-41
• /
• 2011

This paper presents a Combined solar-wave Power Generation (CPG) concept that the CPG unit is maintained as buoyant at the level of sea water and it is also supported by a submerged tunnel, with the aim of supplying emergency electric power during the station blackout events of nuclear power plants. The CPG concept has been motivated from the 2011 Fukushima-Daiichi Accidents due to the loss of both offsite AC power and emergency diesel power caused by natural hazards such as earthquake and tsunami. The CPG is conceptualized by applying different types and different sites for emergency power generation, in order to reduce common cause failures of emergency power suppliers due to natural hazards. Thus, the CPG can provide a new mean for supplying emergency electric power during station blackout events of nuclear power plants. For this application, the CPG requirements are described with a typical configuration at the ocean side of a submerged tunnel.

• Journal of Plant Biology
• /
• 제18권3호
• /
• pp.129-134
• /
• 1975

It was studied of relation between biomass of reed communities (Phragmitis communis) and several environmental factors concerned with such as chlor ine, pH, humus content in soil and depth of seawater submerged. Two sites where were the different geographical conditions were set up. One site had two plots: H plot, at theshallows of seawater, was not submerged except at full tide or at heavy rainfall, and M plot, at medium depth of seawater, submerged at every common tide at inside of a bank along the west seashore of Mu-An-peninsula. The other site also two plots: M' plot, at medium depth, submerged about 10 hours at each tide, and L plot, at deep seawater submerged every tims at tide at the outside of a bank along the eastside estuary of Youngsan river. Maximum standing crop of the reed community was shown on 25th of June: biomass at H M, M' and L plot were respectively 4.65, 3.60, 0.98, and 0.67 kg dry weight per $m^2$. Density of individual at H, M, M' and L plot was 67, 78, 244 and 333 plants per $m^2$. Net production of the terrestrial parts of rred community on the outside of the bank were lesser as much as a sixth than that on inside, but the density of the plant on outside of the bank was higher as much 4 or 5 times than that on inside. It was assumed that the growth of reed plant was inhibited by high chlorine, high pH, less humus in soil and submergence of seawater for long period.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2017년도 9th Asian Crop Science Association conference
• /
• pp.147-147
• /
• 2017

Rice is one of the major staple food in Asia, covering around half of the world population. More than 40% of rice cultivation area are subject to abiotic stresses such as drought, submergence and phosphate deficiency. Pyramiding useful genes into elite variety is a promising strategy to develop tolerance varieties to multiple abiotic stresses. However, some genes are not functionally compatible when they are introgressed into the same elite variety. Here, we tested the functional compatibility of Sub1 and Pup1, major QTLs for tolerance to submergence and phosphate (P)-deficiency conditions, respectively. Phenotypic analysis revealed that IR64-Sub1 Pup1(SP1) plants harboring both Sub1 and Pup1 QTLs showed significant tolerance to submerged conditions, similarly in IR64-Sub1 (Sub1) plant, while SP1 plants failed to tolerate to P-deficiency conditions; only IR64-Pup1 (Pup1) showed strong P-deficiency tolerance phenotype. In submerged conditions, the expression levels of Sub1A and PSTOL1, major genes for Sub1 and Pup1 QTLs, respectively, were not significantly different in between Pup1 and SP1 plants. On the other hand, the expression of both Sup1A and PSTOL1 was significantly downregulated in P-deficiency conditions, suggesting that Sub1 and Pup1 repressed gene expression each other in P-deficiency conditions. These results suggest Pup1 does not compromise the Sub1 function in submerged conditions while Sub1 suppresses the function of Pup1 in (P)-deficient condition, possibly by regulating transcript level of Pup1. In conclusion, Sub1 and Pup1 are functionally compatible in terms of submergence tolerance but not in P-deficiency conditions. Further analysis need to be performed to elucidate how Sup1 suppresses the function of Pup1 in P-deficiency conditions.

• 대한환경공학회지
• /
• 제29권9호
• /
• pp.997-1002
• /
• 2007

본 연구의 목적은 pilot scale ASBF(호기성 침지형 생물막) 반응기를 이용하여 용해성 유기물과 질소화합물의 제거실험을 하였으며, 고정생물막 내에서의 용해성 유기물과 질소화합물 제거를 통한 종속영양미생물 및 독립영양미생물의 동적관계를 이해하고 개선하고자 하였다. 또한, 침지형 생물막 표면에 질산화 박테리아의 성장을 촉진시키기 위해 특별하게 설계한 구조를 라군에 추가하여 폐수처리 효과의 강화 가능성을 조사하였다. 침지형 생물막에 공기 기포가 직접적으로 접촉할 수 있도록 하였으며, 특히 낮은 온도에서 ASBF 실험장치의 용해성 유기물과 암모니아성질소 제거효과를 살펴보기 위해 회분식으로 운전하였다. 본 연구의 ASBF 반응조는 향후 용해성 유기물과 질소화합물의 제거를 위해 기존 폐수처리장 뿐만 아니라 신설 폐수처리장에도 확대 적용될 수 있을 것으로 기대 된다.

• 한국작물학회지
• /
• 제33권4호
• /
• pp.350-352
• /
• 1988

This study was carried out to know the influence of turbidity of submerged water on photosynthetic rate of rice plant after water submerging treatment. Rice plants were transplanted in the pot at maximum tillering stage and they were sumberged for 3days at meiotic stage, 20days after transplanting, in the plastic container which had the clear and turbid water temperature adjusted around 24 to $25^{\circ}C$. Photosynthetic rate at 6 hours recovery after submergence was 41.5 to 54.2% compared to the control, but in the case of cultivar 'Nagdongbyeo', it was rapidly increased by 97.3 to 104.6% in the clear water and by 68.6 to 77.5% in the turbid water at 2 to 4 days recovery after submergence. Photosynthetic rates per plants at 6 hours to 4 days recovery after submergence were 128.3 to 245.5 $C_2$ mg.hr.$^{-1}$, in 'Samgamgbyeo' and 71.1 to 162.4 $CO_2$, mgㆍhr.$^{-1}$ in 'Nagdongbyeo' Photosynthetic rate to respiration ratio of rice plant recovery after submergence was lower compared to control plant and it was lower in 'Nagdongbyeo' than that in 'Samgangbyeo'.ngbyeo' than that in 'Samgangbyeo'.gangbyeo'.pos;.

• 한국기계가공학회지
• /
• 제16권2호
• /
• pp.56-62
• /
• 2017

In this research, reverse engineering was applied to the product manufactured by "Vanzetti" from Italy to develop a localized cryogenic submerged pump used in small-scale LNG liquefaction plants. The results of modal analysis of the impeller and shaft confirmed that the resonance frequency of the impeller and shaft played an important role in the rotor. Modal analysis of the rotor confirmed that the forcing frequency had no influence on the resonance phenomenon.