http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
연구논문 : CFD모사를 이용한 저수지 물순환장치 유동 설계
이요상 ( Yo Sang Lee ) 한국환경영향평가학회 2012 환경영향평가 Vol.21 No.1
Convection Current Circulation System(CCCS) in stratified reservoir controls development of anaerobic condition and algal bloom during summer. In order to increase the CCCS effectiveness, we analyze diverse design parameters to make optimize the flow pattern in reservoir. In this study, we interpret the internal flow with installation and operation condition of CCCS based on CFD in reservoir. Design variables of CCCS is reservoir depth, stratification strength, distance of between CCCS and so on. Since reservoir depth and stratification strength in variables is depending on natural phenomenon, we evaluated current circulation effect by distance of CCCS and proposed the optimal design condition using CFD simulation. Flow and diffusion changes in water body was assessed by temperature and dye test. Changes in water floor temperature at 40m intervals was slowly descending over 37 hours. Dye diffusion simulation at 60m intervals, the radius of the spread between two devices were overlapped after 12 hours.
이요상 ( Yo-sang Lee ),김호준 ( Ho-joon Kim ),최광순 ( Kwang-soon Choi ),이승윤 ( Seung-yoon Lee ) 한국환경기술학회 2013 한국환경기술학회지 Vol.14 No.5
대상지역에 대한 식생조사 결과, 주암댐 주변에 분포하는 대표적인 식물군락은 갈대, 돌피, 개밀, 삿갓사초 등으로 나타났다. 가장 넓게 분포하는 식물은 삿갓사초 군락으로 88.55%의 면적을 차지하였고, 돌피 군락이 6.86%의 면적을 차지하였다. 그러나 호수 주변은 강우사상에 따라 수위 변화가 매년 다르게 나타나며, 식물종도 변하게 된다. 이로 인해 침수 면적과 침수식물의 변화가 다양하다. 우점식물의 면적산출은 식생군락이 최대로 형성되는 6월과 7월의 평균 수위(95.8 m)를 최저기준으로 하였고, 연중 수위가 가장 높은 8월과 9월의 평균수위(105.7 m)를 최고 수위기준으로 하였다. 침수된 식물종류는 갈대, 개밀, 돌피, 삿갓사초로 나타났으며, 삿갓사초가 1,836,317.7 m2으로 가장 넓게 나타났고, 돌피는 175,478.0 m2, 버드나무는 15,827.7 m2 로 나타났다. 이는 전체 수몰면적의 20.35%에 해당하였다. 침수식물의 수질 영향을 평가하기 위하여 영양염 용출실험을 실시한 결과, COD은 삿갓사초가 6.6 mgCOD/g로 가장 높게 나타났고, T-N 및 T-P는 돌피가 3.1 mgT-N/g, 0.28 mgT-P/g으로 가장 큰 용출특성을 나타내었다. 부하산정결과, 삿갓사초는 COD는 23,153.0 kg, T-N은 6,838.5kg, T-P는 952.5 kg으로 전체부하 중 약 95%를 차지하는 것으로 나타났다. 식물에 의해 용출되는 부하를 댐 유역 배출부하와 비교해 보면, T-N은 0.98% 기여하는 것으로 산정되었으며 T-P는 1.44% 인 것으로 나타났다. 이는 침수식물로 인하여 부하가 발생되기는 하지만, 전체배출부하에 대한 기여도는 낮은 것으로 산정되었다. This study carried out flooded area in Dam reservoir. It includes species classification of plant, survey of community structure, examination of pollutant load and assessment of water quality impact. The vegetation of flooding area in Juam reservoir was 7 communities :Carex dispalata, Phragmites communis, Echinochloa crusgalli, Agropyron tsukushiense var. transiens, Salix gracilistyla, Salix. Sp.(include Salix koreensis, Salix subfragilis, Salix chaenomeloides), Veronica peregrina-Echinochloa crusgalli. Carex dispalata(88.55%) was dominant and Echinochloa crusgalli(6.86%) was subdominant. However, the flooded area will appear differently each year depending on rainfall, plant species are also changed. For this reason, the flooded area and species of plant changes varies. To calculate the area of plant distribution, the minimum level was used average water level of the plant growing up in June and July(95.8 m), the highest level was used average water level of in August and September(105.7 m). Submerged plant are surveyed Phragmites communis, Agropyron tsukushiense var. transiens, Echinochloa crusgalli and Carex dispalata. Carex dispalata was occupied most area to 1,836,317.7 m2 and then Echinochloa crusgalli occupies an area of 175,478.0 m2, Salix koreensis was investigated in the area of 15,827.7 m2. Over an area shows corresponding to 20.35% of the total flooded area. In order to evaluate the water quality effect of submerged plant, nutrient release experiments were conducted. The experimental results, Carex dispalata shows the most high COD release rate at 6.6 mgCOD/g. Echinochloa crusgalli shows the most high T-N release rate at 3.1 mgT-N/g and T-P release rate at 0.28 mgT-P/g. Discharged T-N load of submerged plant was estimated to be 0.98% by comparison of total load on watershed and discharged T-P load of submerged plant was estimated to be 1.44% by it. As a result of this view, the load in flooded plants compared to the total discharge load contribution is estimated to be low.