• Journal of Korean Society for Atmospheric Environment
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• 제19권E2호
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• pp.63-73
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• 2003

The atmospheric pollution distribution in the industrial area of Yosu in Korea is calculated using numerical model and the model is validated by comparing the calculations with observed data. The emission of NO$_{x}$ and SO$_{x}$ was estimated for 6 sources, and the emission amount of HC was estimated for 9 anthropogenic sources. The calculated wind speed, wind direction and temperature agreed well with the observed data at two observatories, and the calculated concentration of NO, NO$_2$, $O_3$ and SO$_2$ were also reasonable for 5 monitoring stations. The validity of the model is evaluated using 3 indexes of the EPA, and the model is found to be valid and accurate.ate.

• 한국어병학회지
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• 제12권1호
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• pp.66-69
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• 1999

해산어의 참돔이리도바이러스 (RSIV) 감염 상황을 조사하기 위한 진단법으로 중합효소연쇄반응법(PCR)을 확립하고 1998년 여름 통영을 중심으로 대량폐사가 일어난 남해안 지역의 돌돔, 참돔 및 조피볼락을 대상으로 RSIV의 검출을 행한 결과 남해안 전역의 RSIV 감염이 확인되어졌다.

• 한국동물위생학회지
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• 제20권3호
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• pp.307-312
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• 1997

To investigate the species and infection rate of Tripartiella sp in three species of freshwater fish, carp(Cyprinus carpio), goldfish(Crassius auratus) and Korean catfish(Parasilurus asotus), fish cultured in the fish farms next to Yosu and in the western area of Chunbuk province in Korea was examined from April to June, 1996. The infection rate was evaluated after observing the gill and mucous from 130 fish under the microscope. The species of Tripartiella was identified on the basis of the shape and number of denticle according to methods of Bychowsky(1985) after staining the parasites with 2% methyene blue solution. All the detected-parasite was classified as Tripartiella differed from Trichodina reported previously in our country. T carassii, T californica, T rhombi from Goldfish, T rhombi from common carp, T californica from Israeli carp and T bychowsky from Korean catfish were observed. In the fish from the fish farms in the western area of Chunbuk province, the infection rate of Tripartiella sp was ranged from 6.7% to 100%, but in neither carp nor goldfish from the farms next to Yosu the parasite detected.

• 한국환경과학회지
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• 제15권1호
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• pp.45-58
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• 2006

In order to grasp physical characteristics of Ganajin Bay receiving the effluents from land, a comprehensive field surve)'has been conducted at the north of Wando and Gogeumdo in 2002. Water temperature was most high in September while most low in December. A high temperature in September was inferred to have caused by the dispersion of warm fresh water with favor of a dominant wind in autumn. However, salinity and sigma-t in situ was most low in September while most high in December. A low salinity (or density) in September turned out to reflect the influence of a dense rainfall in summer. Water temperature, salinity and density at the surface layer were lower than those at the bottom layer, except for December. Their horizontal profiles suggested the influence of effluents such as Tamjin River. Particularly, time series of water temperature acquired near the sluice and at the north channel of Wando tended to rise at the flood flow but fall at the ebb flow in accordance with the tide. The form ratio of the tide in the study area was $0.31\~0.32$ and the amplitude of the tide appeared to increase towards the west. Northeastward or southwestward flows prevailed in this area but the residual flows were all northeastward with a magnitude of $3\~4cm/s$.

• 한국해양환경ㆍ에너지학회지
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• 제8권4호
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• pp.220-226
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• 2005

본 논문은 2002년-2004년 하계에 동중국해의 해저에 침적된 폐기물의 분포량 및 조성을 평가한 연구로서, 트롤 조업위치와 소해면적에 따라 다소 불규칙하지만, 폐기물의 종류가 다양하고 분포량이 높은 것으로 평가되었다. 수집된 폐기물의 년도별 평균값은 약 $31-43kg/km^2$ 범위였고, 지점별 분포밀도는 $0-110.3kg/km^2$ 범위로 제주도 인근 북서쪽에서 최대를 나타내었다. 폐기물 종류로는 어망, 문어단지, 통발, 드럼, 비닐과 목재 등이 많이 확인되었고, 어구, 비닐과 플라스틱 등에서는 한국, 중국과 일본 상표가 다수 확인되어 이 지역의 폐기물 분포는 한 중 일간에 어업 조업 및 선박운항 그리고 육상 유입과 밀접히 관련이 있는 것으로 판단되었다. 침적된 폐기물 중 어망, 통발, 문어 단지와 낚시줄 등 어구관련 물질(Fishing gear)들이 42-72% 범위로 대부분을 차지하였고, 이것은 조업 중에 또는 후에 해양으로 고의적 또는 비고의적으로 투기되어 발생되는 것으로 평가되었다. 또한, 로우프와 드럼은 0-30%로 단위면적당 분포량 변동이 컸고, 고무, 플라스틱, 금속, 목재, 직물류 등은 C5를 제외하고는 대략 25% 이내를 차지하는 것으로 조사되었다. 따라서, 동중국해를 포함한 한반도 주변해역에서의 해양 폐기물에 대한 종합적 대책수립을 위해서 지속적인 모니터링과 연구가 필요하다.

• 한국수산과학회지
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• 제37권1호
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• pp.24-32
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• 2004

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 $(NH_4,\;NH_3),\;NO(NO_2,\;NO_3)$ 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 $8\%,$ discharge of particulate and dissolved $8\%.$ The pond B shows $56\%\;and\;26\%$ of sedimentation and volatilization, respectively, to yield $10\%.$ decrease and 8c/o 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 md./L) at the beginning of culture, the pond B obtains higher stocking density (0.0065:0.0091 md./L), longer feeding period (103:121 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.

• 한국수산과학회지
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• 제36권2호
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• pp.151-156
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• 2003

Spatio-temporal distribution of dinoflagellate cysts was monthly investigated at 6 stations in Gamak Bay, the southern Korea from April 2000 to April 2001. A total of 37 species of dinoflagellate cysts belonging to 22 genera were identified. The temporal changes of species number fluctuated with an annual mean of 8 species, 1 species at Stn. 6 in July in the middle Gamak Bay and 17 species at Stn. 2 in June southern Gamak Bay, but 11 to 20 species occurred in the northwestern Gamak Bay all the year round. The major species were Brigantedinium cariacoense, Brigantedinium simpler, Brigantedinium spp., Protoperidinium americanum, Quinquecusphix concretum, Selenopemphix quanta, Scrippsiella trochoidea, Spiniferites bulloideus, Spiniferites spp., Stelladinium reidii, Votadinium carvum, and Polykrikos sp. of kofoidii. The dominant species of dinoflagellate cysts was not evident in the over-all study areas, but in the northwestern Gamak Bay Brigantedinium spp. and Protoperidinium americanum were dominant $(50.4-76.0\%)$ during the study periods. Abundance of dinoflagellate cysts on the surface sediment in the Gamak Bay ranged from 21 cysts/g dry at Stn. 6 in July to 4,322 cysts/g dry at Stn. 4 in August with an annual mean of 688 cysts/g dry. Especially, the highest value occurred in the northwestern Gamak Bay. Heterotrophic species was more abundant than autotrophic species on the surface sediment. In particular, the former occurred in $75-94\%$ in the northwestern Gamak Bay throughout the year. The northwestern area was very different from other area in species number, dominant species and abundance of dinoflagellate cysts. It is mainly due to water stagnation and eutrophication in the area. And the seasonal abundance of dinoflagellate cysts in Gamak Bay was inversly related to water temperature.

• 지질공학
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• 제9권1호
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• pp.31-43
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• 1999

본 연구는 여수반도 북동부지역에서의 단열망 개념의 지하수유동 수치해석에 필요한 단열계의 분포특성에 대하여 여러 가지 방법을 통하여 이를 조사, 분석하는데 목적이 있다. 연구지역의 지질은 크게 화산암류와 화강암으로 구분된다. Order 1∼Order 3등급에 해당되는 광역 및 부지규모의 선상구조는 기존 지질도, 항공사진 및 전산음영기복도를 이용하여 분석되었다. Order 4등급의 단열계에 대한 자료는 지표에서 측선조사를 통하여 이루어졌다. Order 4등급의 단열계에서 저경사각의 Set 4의 방향이 선상구조에서는 두드러지지 않은 점을 제외하고는 전체적으로 유사한 분포양상을 갖는다. Order 4등급의 단열계는 3개의 고경사각 단열조와 1개의 저경사각 단열조로 분류되며, 암종별 뚜렷한 차이는 보이지 않는다. Set 1부터 Set 4의 순서대로 발달 정도가 체계적이며, 충전물질은 상대적으로 저경사각 단열조에 우세한 경향을 보인다. 단열간격은 대수정규분포를 따르고, 수정 Terzaghi 보정을 적용하였을 때 단열조별 단열의 빈도는 0.38/m∼1.01/m의 범위를 갖는다. 단열 길이 역시 대수정규분포를 따르고, 단열조별 평균치는 2.9m∼3.7m의 범위를 갖는다.

• 한국해양환경ㆍ에너지학회지
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• 제8권3호
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• pp.122-133
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• 2005

동해 남부 연안에 위치한 나아해빈을 대상으로 태풍(매미)에 의한 해빈영향을 파악하기위하여 태풍 전 후의 표층 퇴적물조성, 해빈의 해안선 및 단면변화를 관측하였다. 그 결과 해빈의 후빈(backshore)에서는 자갈량이 감소하고 사질함량이 증가하였고, 해빈 전 지역이 침식, 평탄화 되었다. 해저지형변화는 태풍 후 퇴적층 두께 약 4 m까지 침식을 일으키고, 이런 영향은 수심 약 10 m까지 달하며, 해안선은 약 12 m까지 후퇴한 것으로 나타났다. 이것은 해빈에 태풍이 영향을 미칠 때, 높은 파고를 가진 파랑은 해빈의 저부 또는 외해의 저층에 까지 침식작용을 일으키고, 해빈의 상부는 광범위하게 침식된 후 사질로 구성된 퇴적물들이 재퇴적된 것에 기인하는 것으로 생각된다.

• 한국수산과학회지
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• 제36권3호
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• pp.263-269
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• 2003

Morphological development of eggs, larvae and juvenile of the sunrise sculpin, Pseudoblennius cottoides were studed in the field and laboratory at the coastal Dolsan-do, Yeosu-shi from October, 2000 to April, 2001 Egg mass of Pseudoblennius cottoides in peribranchial cavity of Halocynthia hilgendorfi, were observed during late fall to winter in the study area. Fertiliged eggs were spherical in shape, demersal, adhesive, transparent and greenwish yellow color, measuring 1.84 mm (1.83-1.87 mm) in diameter. There were numerous and 17 (15-20) various-sized oil globules accounted in the yolk. Granular materials formed a mass in the yolk. Fertiliged eggs hatched at 301 hr 20 min after morula stage. Newly hatched larvae 6.31 mm (6.24-6.37 mm) in total length (TL), had a large yolk. At 3 days after hatching, the larvae, 6.77 mm (6.69-7.14 mm) in TL came out through the excurrent siphon of Halocynthia hilgendorfi. At 13 days after hatching, the larvae 12.59 mm (12.42-12.63 mm) in TL transformed to postlarval stage. At 32 days after hatching, postlarvae of TL 19.18 mm (19.01-19.46 mm) have reached the juvenile stage.