• 한국대기환경학회지
• /
• 제18권1호
• /
• pp.1-10
• /
• 2002

A three-dimensional numerical model which involved the nesting method was developed to reproduce the wind circulation of Kwangyang Bay area which comprises complicated mountains and sea topograph. The calculated results indicated geographical effects of Kwangyang Bay area, sea/land breezes and mount-valley wind which are local circular winds. We also noticed that the northern inland area of Kwangyang Bay formed the very complex wind systems under the influence of such geographic effects when a land breeze was not formed. A good agreement was found between predicted and observed values of temperature. In addition, the calculated results of the wind direction and the wind velocity are in accord with the observed values. They showed only a slight difference in between predicted and the observed values, when the sea breeze and the land breeze are changing.

• Fisheries and Aquatic Sciences
• /
• 제6권3호
• /
• pp.149-154
• /
• 2003

The characteristics of pollutant loads from the various sources and seawater quality in Kwangyang Bay were evaluated. Total flow rate was estimated to be $10,868,066.8 m^3/day$ with a flow rate of R2l (the Seomjin River) as the highest one. Total COD, TN and TP loads of the input rivers and the ditches were about 27,591.8, 25,029.6 and 586.4 kg/day, respectively. Wastewater discharging loads was the greatest contributors to pollutant loads in the inner part of Kwangyang Bay. COD values in the inner part of the bay was over 3.0 mg/L, which exceeded the seawater quality criteria III of Korea. The average values of DIN and DIP were 8.62 ${\mu}gN/L\;and\;1.26\;{\mu}gP/L$, respectively. The limiting factor for algal growth was DIN. In he total discharging loads of the watershed from unit loading estimations, BOD, TN and TP were 9,132.3, 2,727.2 and 304.2 kg/day, respectively. In addition, municipal sewage by the population as pollution sources and the city of Kwangyang as administrative district had the highest loads. For a appropriate water quality recovery of Kwangyang Bay, it is suggested that it is essential to estimate reduction rate of total pollutant loads by water quality modeling.

• 대한토목학회논문집
• /
• 제12권3호
• /
• pp.115-125
• /
• 1992

광양만의 지형변화에 따른 유황변화를 수심방향으로 적분된 2 차원 조석방정식을 사용하여 검토하였다. 연구결과 부두건설에 따른 해수면적의 감소로 인해 광양만으로 유입하는 조석량이 작아졌으며, 이로 인해 묘도를 중심으로한 만 외측에서는 조위차가 약간 커졌으며, 만내측에서는 전반적으로 수위가 하강한 것으로 나타났고, 특히 간조시의 수위 하강현상이 뚜렷하게 나타났다. 유속의 변화양상은 광양만 전체에 걸쳐 건설전 보다 작아졌으나, 광양동천에서 만으로 유입되는 수로에서는 수로 단변의 축소로 유속이 증가한 것으로 나타났다. 또한 대조기 시에 광양만으로 유입하는 수어천, 광양동천, 그리고 만의 외부경계인 섬진강으로 부터의 홍수량을 100 년 빈도로 한 결과, 섬진강하구에서는 약 1.2 m 그리고 광양만 내측에서는 약 0.3 m 의 수면상승을 초래하는 것으로 나타났다.

• 한국해안·해양공학회논문집
• /
• 제23권1호
• /
• pp.126-137
• /
• 2011

본 연구에서는 EFDC 모델을 이용하여 광양만과 진주만 해역에 대한 조석과 수온, 염분을 고려한 3차원 해수순환 양상을 재현하였다. 수치모델 결과는 관측 자료를 이용하여 검증하였고 그 결과 모델은 관측결과를 잘 재현하였다. 실험 결과, 연구해역의 해수순환은 노량수도와 대방수도 중간 해역에서 해수가 수렴 및 발산되는 양상을 보이고 잔차류는 전형적인 2층 순환구조를 보인다. 모델을 통해 광양만과 진주만 일대의 밀도성층 변화를 분석한 결과, 연구해역은 담수의 영향이 지배적인 해역으로 진주만의 경우 남강댐 방류의 영향을 지배적으로 받는 해역이지만 남강댐에서 방류를 하지 않는 경우에는 섬진강의 영향도 받는 것으로 나타났다. 한편 남강댐 방류시에는 광양만의 성층이 상대적으로 강화되는 결과를 볼 수 있었다.

• 한국환경과학회지
• /
• 제9권5호
• /
• pp.397-402
• /
• 2000

Numerical simulation model using nesting method and considering topographic features was developed to predict atmospheric environments atmospheric flow temperature and diffusion of air pollutants in Kwangyang bay where having complex areas of point sources Korea. In addition developed simulation model was used tracing of spreading range of pollutants when a gas leaks suddenly from Yeo-cheon industrial complex. by comparing the measured and calculated data on atmospheric flow temperature and diffusion of air pollutants the results showed that this model can be well applied and complicated topography affected the diffusion of air pollutants.

• Fisheries and Aquatic Sciences
• /
• 제1권2호
• /
• pp.216-226
• /
• 1998

Specimens of the spionid polychaetes (Polychaeta: Spionidae) were collected and examined in the subtidal shallow waters of Kwangyang Bay, southern coast of Korea, from April 1990 to November 1994. Five species of the genus Prionospio are described and illustrated: Prionospio (Minuspio) multibranchiata Berkeley, 1927, P. (Prionospio) saccifera Mackie and Hartley, 1990, P. (P.) bocki Soderstrom, 1920, P. (P.) membranacea Imajima, 1990, and P. (P.) paradisea Imajima, 1990. These five species of spionid polychaetes are reported for the first time in Korean waters.

• 한국환경과학회지
• /
• 제13권6호
• /
• pp.543-549
• /
• 2004

Polycyclic aromatic hydrocarbons(PAHs) in sediments of Kwangyang bay on Korea, have been investigated by gas chromatography-mass spectrometery (GC/MS). The average content of total PAHs in all samples was 2,211ppb, and the range was from 36 to 22,699ppb. The higher concentrations were found in sediment sampled near Kwangyang iron processing plant, Taeindo. The resulting distributions of PAHs according to the number of aromatic ring and molecular ratios of specific aromatic compounds (phenanthrene, anthracene, fluoranthene and pyrene) have been discussed in terms of sample location, origin of the organic matter. Four, five and six rings of PAHs were mainly found near to Kwangyang iron processing plant, and three and four rings near to Yeosu chemical kombinat This result typically indicated the local characteristics, depending on the origin of PAHs.

• 한국해양학회지:바다
• /
• 제9권3호
• /
• pp.119-129
• /
• 2004

2003년 9월 12일에 태풍 “매미”가 남해안으로 상륙하면서 발생한 광양만의 해일고를 산정한 결과, 고조위 편차는 93∼108 cm이고, 최대 조위편차는 176∼196 cm로 나타났다. 최대 조위편차를 요인별로 분석하면 기압강하에 의한 해면상승이 59 cm, 섬진강 홍수로 인한 수위 상승이 4∼5 cm, 그리고 외해로부터 해일파의 전파 및 강풍에 의한 해면상승이 l13∼132 cm이다. 이번에 광양항(PT3)에서의 실측 최고조위 460 cm는 광양제철소 부지 설계시에 추정한 100년 빈도 설계조위 455 cm보다 5 cm 높고, 1987년 태풍 “셀마” 통과시에 기록된 기왕 고극조위 445 cm보다 15 cm높은 조위로서, 과거 20년 간의 최대 고극조위를 나타냈다.

• 한국환경과학회지
• /
• 제13권9호
• /
• pp.789-798
• /
• 2004

Physicochemical characteristics of Kwangyang Bay, have been investigated on the effects of inputting rivers just after rainy season in summer 2003. The results ranged from 4.96～8.01 mg/L for DO, 1.16～3.09 mg/L for COD, 7.21～67.71 uM for DIN and 0.12～121.84 uM for phosphate. The COD of Yeosu Area was 1.19～3.09 mg/L, Kwangyang Area was 1.23～2.76 mg/L. The COD of Wallae cheon in Yeosu Area was 3.09 mg/L and Donghoan in Kwangyang Area was 2.76 mg/L. The reason of high COD might be industrial sewage of organic chemical plants and iron foundry. DIN of Yeosu Area and Kwangyang Area were 7.21～63.43 ${\mu}M$ and 8.43～67.71 ${\mu}M$ respectively. The average phosphate of Yeosu Area was 23.65 u. The source of phosphate might be industrial sewages of fertilizer plant and phosphate gypsum stocked with high amounts. The metal concentrations were measured in the range of 1.01～175.10 ${\mu}g/L$ for Cu, 0.13～1.78 ${\mu}g/L$ for Cd, 1.13～5.21 ${\mu}g/L$ for Pb, 1.58～13.57 ${\mu}g/L$ for Cr and 1.07～20.68 ${\mu}g/L$ for As. The average Cu concentration was 78.99 ${\mu}g/L$ in Kwangyang Area. The source of Cu might be industrial sewage of iron foundry. The average Cr concentration of Yeosu Area was 9.07 ${\mu}g/L$. That is 2 times higher than Kwangyang Bay 5.74 ${\mu}g/L$, because of sewage of chemical plants.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2006년도 전기학술대회논문집
• /
• pp.205-206
• /
• 2006

The surges caused by the typhoon of Korea are analysed in Kwangyang Bay. The deviations of the high water level were $74{\sim}185cm$ and the maximum deviations of the water level (maximum surges) were $151{\sim}240cm$ in Kwangyang Bay during the typhoon. The major parameters of the maximum deviations of the water level are as follows : Analysis shows that the pressure drop increased the sea level by $43{\sim}59cm$, the flood of the Sumjin River by $4{\sim}5cm$ and the external surge propagation and wind setup by $97{\sim}192cm$.