대청다목적댐의 수질 모델링

류병로,이재경,한양수 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1

This study was conducted to develop the water quality simulation model(RBOX) to describe the temporal and spatial variation of the two dimensional water quality concentrations in Taechung reservoir. Modeling efforts are divided into two parts; 2-dimensional water quality modeling by RBOX model, and water quality modeling included stream water quality (QUAL2E-H) and reservoir water quality (WQRRSR) for the Taechung dam. The RBOX modeling system was designed to provide the generality and flexibility necessary for analyzing a verity of water quality problems in a diverse set of water bodies. An algorithm has been composed of a hydrodynamic module which solves the equations of motion and continuity, a pollutant dispersion module which solves the dispersion-advection equation. RBOX can simulation up to 10 water quality constituents; i.e., daily output of Dissolved oxygen, pH, Temperature, Algae as chlorophyll-a. Ammonia as nitrogen. Nitrate as nitrogen. Dissolved orthophosphate as phosphorus, Alkalinity, Biochemical oxygen demand and Suspended solid. Actual simulation were applied to the whole region of the Taechung reservoir considered the influx of the three tributury inflows (okchun chun, Taejon intake tower and Chungju intake tower). The results of simulation have shown the two dimensional water quality concentration profiles. Calibration of the calculated flow fields and water quality parameters to be accomplished since no available field measurement data were performed in Taechung reservoir. After calibration and verification of the model, water quality simulations were also performed for 1996, 2001 and 2006, under assumption of neither additional treatment nor interceptor sewers with QUAL2E-H model. And also water quality were predicted for the lake water with WQRRSR and RBOX model. Considering the polutants removal plan of the EPA, water quality simulations were also performed for 1996, 2001 and 2006. Efforts have also been made to compare the predicted water quality for each removal plan. As a further study, RBOX can be very helpful tool as optimum water quality management in Taechung mulipurpose reservoir, say, database link system.

畜産廢水의 生分解에 관한 硏究

류병로,이재경,한양수 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1

This study was carried out determine the optimum design condition of the reactor and to get more operational characteristics of the biological treatment plants for the animal wastewater. The two stage reactors were operated with retention times of 7.6days(1st stage) and 3.4 days(2nd stage) at the temperature 20±1℃ using a mixing raw wastewater. From the results of the experiments, the optimum F/M ratios were 0.17, 0.1 ㎏ BOD/㎏ MLSS-day each stage. At the conditions of the reaction, the removal efficiency of BOD, COD, SS were 95%, 97%, 96%.

양식 은어의 미포자충 감염예에 대한 병리조직학적 관찰

조병열,강형길,강효주,류갑민,이재영,박남규,허민도 한국어병학회 2003 한국어병학회지 Vol.16 No.1

1998년 9월 말경, 경남 지역의 양식 은어(Plecoglossus altivelis)에서 미포자충증이 발생하였다. 채집 당시, 하루 약 200마리씩의 폐사가 10일째 진행되고 있었으며 약 10%의 누적폐사율을 나타내었다. 병어는 입올림을 하거나 기면 상태에 있었으며, 대부분 체색흑화 및 복부팽만 소견을 보이고 있었다. 아가미, 아가미 뚜껑, 각종 내장, 복강벽 및 생식소에 직경 1~3㎜의 흰색 결절이 다수 형성되어 있었다. 감염 어종, 기생충의 형태 및 xenoma 분포 장기의 다양성에 근거하여 Glugea plecoglossi에 의한 감염증으로 추정되었다. 병리조직학적 검사를 실시한 결과, 광범위한 장기에 걸쳐 xenoma를 형성하고 있었으나 xenoma 인접조직에 변성 변화는 없었다. 아가미 새변, 비장, 두신 및 체신의 조혈영역에 심한 울혈 소견이 인정되었고, 간장, 심근 및 신세뇨관 국소에는 응고 내지 액화괴사 소견이 확인되었다. 따라서, xenoma의 인접조직에 대한 물리화학적인 영향보다는 xenoma형성 장기 및 조직에 야기된 국소 순환장애가 은어의 폐사와 직접적인 관련을 갖는 것으로 사료되었다. On September in 1998, a microsporidian infection was recognized in ayu, Plecoglossus altivelis, farmed on Kyongnam province of South Korea. Cumulative mortality was around 10% in 10 days. Infected fish which were piping for air near the surface of the water or in the asphyxic, lethargic condition revealed darkening of body and abdominal distention. Numerous whitish nodules up to 3㎜ in size were observed throughout most of body organs and tissues including gill, operculum, peritoneal wall and organs. Xenomas were also histologically confirmed in multiple internal organs with the evidences suggesting circulatory disturbance. Based on the morphology of spore and xenoma, and the distribution of xenomas in organs and tissues, this disease was diagnosed to be a microsporidiosis caused by Glugea plecoglossi. The mortality might be deeply related to the local circulatory disturbance by xemonas rather than the mechano-chemical effect of xenomas on adjacent tissues.

Gas hydrates in the Ulleung Basin, East Sea of Korea

Ryu, Byong-Jae,Riedel, Michael Chinese Geoscience Union 2017 TAO Vol.28 No.6

<P>To develop gas hydrates as a potential energy source, geophysical surveys and geological studies of gas hydrates in the Ulleung Basin, East Sea off the east coast of Korea have been carried out since 1997. Bottom-simulating reflector (BSR), initially used indicator for the potential presence of gas hydrates was first identified on seismic data acquired in 1998. Based on the early results of preliminary R&D project, 12367 km of 2D multichannel reflection seismic lines, 38 piston cores, and multi-beam echo-sounder data were collected from 2000 to 2004. The cores showed high amounts of total organic carbon and high residual hydrocarbon gas levels. Gas composition and isotope ratios define it as of primarily biogenic origin. In addition to the BSRs that are widespread across the basin, numerous chimney structures were found in seismic data. These features indicate a high potential of the Ulleung Basin to host significant amounts of gas hydrate. Dedicated geophysical surveys, geological and experimental studies were carried out culminating in two deep drilling expeditions, completed in 2007 and 2010. Sediment coring (including pressure coring), and a comprehensive well log program complements the regional studies and were used for a resource assessment. Two targets for a future test-production are currently proposed: pore-filling gas hydrate in sand-dominated sediments and massive occurrences of gas hydrate within chimney-like structures. An environmental impact study has been launched to evaluate any potential risks to production.</P>

Chimney Structures in the Ulleung Basin, East Sea

Byong-Jae Ryu(류병재) 한국신재생에너지학회 2018 한국신재생에너지학회 학술대회논문집 Vol.2018 No.4

동해 심해 울릉분지의 침니 구조

류병재(Byong-Jae Ryu) 대한지질학회 2014 대한지질학회 학술대회 Vol.2014 No.10

동해 울릉분지 침니구조 내의 가스 하이드레이트

류병재(Byong-Jae Ryu) 한국신재생에너지학회 2016 한국신재생에너지학회 학술대회논문집 Vol.2016 No.11

가스 하이드레이트

류병재(Ryu, Byong-Jae) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06

Gas hydrates are ice-l ike sol id compounds that are composed of water and natural gas. All common gas hydrates belong to the three crystal structures that are composed of five polyhedral cavities formed by hydrogen bonded water molecules and stable in specific high pressure and low temperature conditions. Gas hydrates contain large amounts of organic carbon and widely occur in deep oceans and permafrost regions, and they may therefore represent a potential energy resource in the future. United States and Japan perform the national R&D programs for the commercial production of gas hydrates in 2010's. The study on gas hydrates are also important for exploration and development of natural gas in the regions where gas hydrates are accumulated and could be formed. Although their global abundance is debated, they play an important role in global climate change since methane is a 50 times more effect ive greenhouse gas than carbon dioxide. Natural gas hydrates also form a possible natural hazard if rapidly dissociated and can cause slides and slumps and in the marine environment associated tsunamis.

우리나라 동해의 가스 하이드레이트

류병재(Byong-Jae Ryu) 한국신재생에너지학회 2016 한국신재생에너지학회 학술대회논문집 Vol.2016 No.5

동해 울릉분지 남서부 천부 퇴적층에서의 가스 생성 및 천연가스 하이드레이트 형성 잠재력과 이들의 부존 증거

류병재(Ryu, Byong-Jae),이영주(Lee, Young-Joo),김지훈(Kim, Ji-Hoon),김일수(Kim, Il-Soo) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11

Regional geophysical surveys and geological cal studies on natural gas hydrate (NGH) in the East Sea were carried out by the Korea Institute of Geoscience and Mineral Resources (KIGAM) from 2000 to 2004. 16 piston cores, 2270 L-km of multi-channel reflection seismic (MCRS) data and 730 L-km of 3.5kHz Chirp data obtained from the southwestern part of the deep-water Ulleung Basin were analyzed in this study. In piston cores, cracks generally developed parallel to bedding suggest significant gas content. The core analyses showed high total organic carbon (TOC) content, sedimentation rate and heat flow of sediments. These are in favor of the general ion of substantial biogenic methane, which can form the NGH within the stability zone of the near seafloor sediments in the study area. The cores generally show also high residual hydrocarbon gas concentrations for the formation of natural gas hydrates The geophysical indicators of the presence of gas and/or NGH such as bottom simulating reflectors (BSRs), seismic blank Bones, pockmarks and gas seeping features were well defined on the MCRS and Chirp data.