동중국해 식물플랑크톤 군집의 공간분포와 와편모조류 적조

윤양호 ( Yun Yang Ho ),박종식 ( Park Jong Sig ),서호영 ( Seo Ho Yeong ),황두진 ( Hwang Du Jin ) 한국환경생물학회 2003 환경생물 : 환경생물학회지 Vol.21 No.2

N/A Abstract - We carried out a study on thermobaline structure and phytoplankton community in the East China Sea during early summer in 2002. As a result of marine environment and phytoplankton community, three characteristics of water type were identified. The former was characterized by the dominant species with diatoms, Chaetoceros lacinwus, Ch. decipiens, Guninardia flaeeida, PamZia sulcata, Pseudonitzschia pungens and Pseudosolenio calear-auis in Chinese coastal waters, the secondary was done by lower water temperature, salinity and the dominant species with dinoflagellates, Promcentrum donghaiense and Cemtium fusus, in over-a11 areas and the latter was done by the dominant species with coastal species of diatoms, Skeletonem costatum and Nitzschia longissima and eilicoflagellate, Dictyoeho speculum var. octopers in the transfer areas of Chinese continental coastal waters. Phytoplankton community in the surface layer identified a total of 66 species belonging to 36 genera Dominant species was Promcentrum donghieme, Chaetoceros lacinious, Skeletonem costaturn. Standing crops of phytoplankton in the surface layer fluctuated between 1.5 × 10^(4) cells L^(-1) ` and 3.5 × 10^(5) cells L^(-1). And the highest value appeared in the Cbangjiang estuaries with high dominance by diatoms and lowest one occurred in the southwestern area of Jeju Island with bigh dominance by dinoflagellates. Red tides with dinoflagellate, Prororcentrum donghaiense appeared in the frontal areas with maximum cell density, 3.4 x lo5 cells L-`. And outbreak environments was low water temperature under 20C, and low salinity under 31.55 psu. The vertical die tribution of red tide organisms went to about 3Om depth from surface.

득량만 남서해역 식물플랑크톤 군집의 시,공간적 분포특성

윤양호 ( Yun Yang Ho ),김동근 ( Kim Dong Geun ) 한국환경생물학회 2003 환경생물 : 환경생물학회지 Vol.21 No.1

N/A The spatio-temporal distribution and seasonal fluctuations of phytoplankton community were carried out in the Southwestern parts of Deukryang Bay of the Korean South Sea from July 1997 to January 1998. A total of 60 species of phytoplankton belonging to 41 genera was identified. In the southwestern parts of Deukryang Bay seasonal succession in dominant species; Eueampia zodiacus, and Chaetoeeros spp. in summer, Nitzschia Zongissima, Chaetoceros curuisetus and Bacillaria paxillifera in autumn, Skeletonema costatum and B. paxillifera in winter, were very predominant. The community structure of phytoplankton in the southwestern parts of Deukryang Bay appeared to be diverse in species composition, and diatoms were most dominant through the year. Phytoplankton standing crops fluctuated with an annual mean of 1.2 × lO^(5)cells L^(-1) between the lowest value of 8.0 × 10^(3) cells L^(-1) in January and the highest value of 6.9 × 10^(5) cells L^(1) by Nitzschia longissima in January. Densities of the phyto-plankton cell number by the samples of the southwestern parts of Deukryang Bay ranged from 1.1 x 10^(4) cells L^(-1) to 1.3 × 10^(5) cells L-` with the mean value of 4.1 × 10^(4) cells L^(-1) in summer, from 1.0 x 10^(4) cells L^(-1) to 6.9 × 10^(5) cells L^(-1) with mean of 1.8 × 10^(4) cells L^(-1) in autumn, from 8.0 x l0^(3) cells L^(-1) to 4.6 x 10^(5) cells L^(-1) with mean 1.6 × 10^(5) cells L^(-1) in winter. That is to say, phytoplankton standing crops was high in low temperature seasons, while low in high temperature seasons. Chlorophyll a concentration fluctuated between 1.08 mg m^(-3) and 21.6 mg m^(-3) in January. In the southwestern parts of Deukryang Bay temporal change in chl-a concentration was not apparent. But chl-a concentration was high during a year. Therefore, phytoplankton production in the southwestern parts of Deukryang Bay could be very high year-round.

학술발표회 분야별 발표일정 : 2) 해양,환경분야 ; 구두발표: 가막만 양식장 주변해역 표층퇴적물중 유기물량 분포 특성

윤양호 ( Yun Yang Ho ),노일현 ( No Il Hyeon ) 한국수산학회 2003 추계학술발표회 Vol.- No.-

고밀도 축제식 양식장의 질소역학과 대하 (Fenneropenaeus chinensis) 성장

강윤호 ( Kang Yun Ho ),윤양호 ( Yun Yang Ho ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.1

N/A A mathematical model is used to investigate nitrogen dynamics in the intensive aquaculture ponds in the western coast of Korea. Parameters associated with water quality, sediments and growing of shrimp (Fenneropenaeus chinensis) are measured to calibrate the model for feeding ponds A and B and storage ponds. The model describes the fate of nitrogen including loadings of ammonia from feeds, phytoplankton assimilation, nitrification, sedimentation, volatilization and discharge. The model obtains good agreements with the measured values of TAN (NH₄, NH₃), NO (NO₂, NO₃) and Chl (chlorophyll a). Impacts of water exchange on TAN and Chl are investigated, showing that the range of 0.01-0.2 (/day) cannot effectively reduce TAN but reduces Chl. Nitrogen in the ponds A is removed by sedimentation 66%, volatilization 18%, discharge of particulate and dissolved 8%. The pond B shows 56% and 26% of sedimentation and volatilization, respectively, to yield 10% decrease and 8% increase compared to those in the pond A. While the pond A has larger area (1.02:0.66 ha) and same stocking density (0.025 ind./L) at the beginning of culture, the pond B obtains higher stocking density (0.0065:0.009 1 ind./L), longer feeding period (1 03: 12 1 day) and resultant higher shrimp production (1.15:2.13 t/ha/cycle) at harvest. This is possibly due to the hydraulic characteristics driven by paddlewheels. At low ratio of the low speed area and the pond area, the rate of sedimentation is high, while the rate of gas exchange is low. Thus, the measurement and model analysis suggest that water quality and shrimp production are positively correlated with the hydraulic characteristics in the shrimp ponds.

학술발표회 분야별 발표일정 : 2) 해양,환경분야 ; 구두발표: 식물플랑크톤의 (phosphorus) 공급원으로 중요한 alkaline phosphatase hydrolyzable phosphorus

오석진 ( O Seog Jin ),윤양호 ( Yun Yang Ho ),양한섭 ( Yang Han Seob ),( Tamiji Yamamoto ),( Yukihiko Matsuyama ),( Shigeru Itakura ),( Satoshi Nagai ) 한국수산학회 2003 추계학술발표회 Vol.- No.-

동중국해 음향 산란층내의 euphauiid (Euphausia pacifica) 밀도 추정

강돈혁 ( Kang Don Hyeog ),황두진 ( Hwang Du Jin ),서호영 ( Seo Ho Yeong ),윤양호 ( Yun Yang Ho ),서해립 ( Seo Hae Lib ),김용주 ( Kim Yong Ju ),신현출 ( Sin Hyeon Chul ),( Kohji Iida ) 한국수산과학회 2003 한국수산과학회지 Vol.36 No.6

N/A Hydroacoustic and open-closing zooplankton net survey were conducted to understand the characteristics of the sound scattering layer (SSL) and to estimate the density of an euphausiid (Euphausia pacifica) in the SSL, in the northwestern part of the East China Sea. The survey was carried out during July 6-9 2002 at 8 sampling stations for zooplankton. The virtual echogram technique was used to identify E, pacifica from all acoustic scatters. Mean volume backscattering strength difference (MVBS_(120kHz-38kHz)) and target strength equation for E. pacifica were derived from the Distorted-wave Born Approximation (DWBA) model. Although vertical migration of the SSL is similar to the general pattern, dispersion at qight shows some differences. Estimated mean 3density using acoustic data ranged from 20.4-22 1.4 mg/m over the whole depth, and 87.1-553.5 mg/m in the SSL. The density using the zooplankton net ranged from 0.2-362.4 mg/m3 and was not related to net deploying method. The results from the acoustic and net survey suggest that E. pacifica might be an important zooplankton community in the northwestern part of the East China Sea.

영일만(迎日灣) 표영군집내(漂泳群集內)의 (210)Po 축적(蓄積)

서해립 ( Hae Lip Suh ),김성수 ( Seong Soo Kim ),고유봉 ( You Bong Go ),남기완 ( Ki Wan Nam ),윤성규 ( Sung Gyu Yun ),윤양호 ( Yang Ho Yoon ),조수근 ( Soo Gun Jo ),홍재상 ( Jae Sang Hong ) 한국수산학회 1995 한국수산과학회지 Vol.28 No.2

1993년 여름 영일만에서 채집한 해수, 플랑크톤, 어류 내의 천연 방사성 핵종 (210)Po 농도를 조사했다. 해수중의 평균농도는 1.9mBq/l이었고, 용존성의 비율은 46%였다. 식물플랑크톤 세포수의 95% 이상을 차지한 중심목 규조 Skeletonema costatum의 농축계수는 7.6×10(4)이었다. 동물플랑크톤 다섯 종을 조사했는데, 그 가운데 요각류와 곤쟁이류 두 종씩 모두 네 종의 농도범위는 210~584mBq/g (건조중량)이었으나, 요각류 Labidocera bipinnata는 2,070mBq/g으로 예외적으로 매우 높았다. 이 자료에서 L. bipinnata가 육식성 포식자로 나타났다. 어류 幽門盲囊의 (210)Po 농도와 농축계수는 따로따로 2,979~3,810mBq/g과 3.4~4.3×10(6)이었다. 생물체내 (210)Po의 농축계수는 식물플랑크톤〈여과섭식 요각류〈잡식성 곤쟁이류〈육식성 요각류〈浮魚類 順이었다. A study was made of the concentration of the naturally occurring radionuclide (210)Po in seawater, plankton and fishes collected from Yongil Bay, Korea, in summer 1993. The mean value of the (210)Po concentration in sea water was determined to be about 1.9mBq/l, with the proportion of the dissolved forms being about 46%. The mean (210)Po concentration factor in the centric diatom Skeletonema costatum, comprises > 95% of the total phytoplankton cell number, was 7.6×10(4). Of five species of zooplankton examined, four species (two copepods and two mysids) had (210)Po concentrations in the range of 210~585mBq/g dry weight. A copepod Labidocera bipinnata, however, was exceptional with a particularly high (210)Po level of 2,070mBq/g. This indicates that L. bipinnata is primarily a raptorial feeder. The concentration of (210)Po in the pyloric caecum of pelagic fishes was 2,979~3,811mBq/g, with the concentration factors of 3.4~4.3×10(6). The food chain concentration of (210)Po occurred as follows: phytoplankton < filter feeding copepods < omnivorous mysids < raptorial copepod < pelagic fishes.

수치모형을 이용한 우수관거 내 토사퇴적량 산정

송양호(Song, Yang Ho),윤 린(Yun, Rin),이정민(Lee, Jung Min),이정호(Lee, Jung Ho) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.1

도심지 우수관거 내부에서 발생되는 퇴적은 유수의 흐름을 방해하고 집중 호우시 침수피해를 야기하는 주요 원인들 중하나이다. 이러한 위험요소를 제거하기 위해서는 수시 또는 정기적으로 관 내부를 점검하여 관거 본래의 기능이 보전될수 있도록 체계적인 유지관리가 필요하다. 이를 위해서 우수관거로 유입되는 토사량에 대한 거동 특성과 발생하는 퇴적에 대한 특성을 분석할 필요가 있다. 본 연구에서는 수치모형을 바탕으로 우수관거와 동일한 제원을 적용하여 분석을 실시하였다. 분석의 경우 관거의 내부에 유입되는 조건과 유사입자크기 및 유입유사량을 변화해가면서 진행하였다. 조건별로 관거 내부에서 발생되는 이송⋅침전현상을 검토하였으며, 이를 종합하여 퇴적토사량을 산정하였다. 본 연구에서 수행한 수리학적인 분석의 경우 향후 실제 현상과 같은 거동을 비교, 검토할 경우 CFD 모형이 효과적으로 사용될 수 있음을 확인하고자 하였다. 이러한 결과는 단순히 관거에 대한 유입조건들의 변화로부터 계산된 값이므로 실제와는 다른 양상을 보일 수도 있다. 그러나 이연구결과는 개선방안을 정립하고 다양한 분야의 수리구조물 관련 설계와 유지관리지침에 활용이 가능할 것으로 기대된다. Sedimentation occurs in urban sewer, it disturbs the runoff rate and one of the main reasons causing inundation during heavy rainfall. In order to eliminate risks, we must check the inside of the sewer at any time or on a regular basis. Based on this, systematic maintenance management is necessary so that the original function of the sewer can be maintained. It is necessary to review the flow characteristics and sedimentation phenomena for the amount of sediment flow rate into the sewer system. In this study, analysis was carried out by applying the same specification as a sewer based on a numerical model. Analysis was carried out while changing the particle size and inflow rate similar to the runoff condition into the sewer. The transport and erosion phenomena occurred in the conduit were reviewed. Based on this, the amount of sedimentations was calculated. In this study, we tried to confirm that the hydrodynamic analysis carried out on the CFD model was able to use this effectively when comparing and examining the same behavior as the actual phenomenon. These results were calculated simply from changes to inflow conditions, maybe different from the actual situation. However, this research result is expected to be able to establish an improvement proposal, and to utilize design and maintenance management guidelines of repair structures in various fields.

가막만에 출현하는 동물플랑크톤의 종조성과 계절별 출현 양상

서호영,이인태,윤양호,최상덕,이삼노,한명일,김병섭,강윤호,이우범 한국환경생물학회 2002 환경생물 : 환경생물학회지 Vol.20 No.2

가막만에 출현하는 동물플랑크톤을 계절별(2001년 4월, 7월, 9월, 12월)로 Norpac네트를 이용하여 수직 채집하였다. 우점적으로 출현한 분류군은 4월과 12월에 요각류, 7월에 요각류와 지각류,9월에 야광충이었다. 출현 개체수는 22~17,197indiv. m^-3으로 시·공간적으로 변동폭이 매우 컸다. 요각류의 우점종은 4월에 Euryte-mora pacifica, Acartio omorii, Cenfropages abdominalis, Colanus sinicus, 7월에 Lobidocera rofunda와 A. erythraea, 9월에 A. eryfhraea와 Paracalanus parvus s. l., 12월에 A. omorii와 E. pacifca로 주로 내만종으로 변하였다. 그러나, 9월에 외양종인 Eucalanus sp.와 Neo-calnus sp. 또한 다수 출현하였다. 이와 같은 출현 경향은 가막만이 폐쇄성 내만임에도 불구하고 동물플랑크톤의 분포 특성은 내만수 이외에 계절적으로 외만수의 영향을 강하게 받고 있음을 암시하고 있다. Zooplankton was sampled vertically with a Norpac net from Gamag Bay in April, July, September and December, 2001. Copepods were predominant in April and December, and cladocerans in July and Noctiluca scintillans in September, respectively. There are high spatio-temporal fluctuations in the abundance of zooplankton with a range of 22∼17,197 indiv./㎥. In the copepod community, neritic species, Eurytemora pacifica, Acartia omorii, Centropages abdominalis and Calanus sinicus were predominant in April; Labidocera rotunda and A. erythraea in July; A. erythraea and Paracalanus parvus s. l. in September; A. omorii and E. pacifica in December. However, oceanic species Eucalanus sp. and Neocalanus sp. were abundant in September. It indicates that although Gamag Bay is semi-closed, the distribution pattern of zooplankton is seasonally strongly affected by oceanic waters in addition to neritic ones.