• 한국환경과학회지
• /
• 제8권1호
• /
• pp.1-6
• /
• 1999

This study was carried out to evaluate off-shore water quality and to draw marine pollution map to Southern sea in Korea by bioassay using gametes and early development system of Asterias amurensis. From the bioassay, it was determined that the water qualites of Southern sea maintained the grade II, because development of A. amurensis were moderately inhibited. However, Sunchon, Kwangyang, and Jinhae Bay belonged to grade III, because development of A. amurensis were strongly inhibited. This could be due to the inflows of several river systems and poor water circulation. The water quality at Yosu island was the grade I, because A. amurensis were not inhibited in its early development.

• 한국환경과학회지
• /
• 제26권6호
• /
• pp.691-710
• /
• 2017

This study was performed to investigate the geochemical and benthic environment of three shellfish farms in Suncheon Bay during the period of September 2014 ~ April 2015. Three sampling stations were selected; St.1 is the shellfish farm of razor clam near Jangsan area. St.2 is the shellfish farm of small ark shell near Hwapo area and St.3 is the shellfish farm of razor clam near Yongdu area. Razor clam was the dominant species at St.1, small ark shell and granulated ark shell were dominant at St.2 and St.3, respectively. Granulated ark shell inhabited St.3, although it is not cultured at that station. This station's exposure to air during the ebb tide and sediment composition likely provides the appropriate habitat for granulated ark shell species. Analysis of the number of different species showed that 8 benthos species were found to be distributed at St.1, 18 species at St.2, and 13 species at St.3. Among three stations, the highest Ignition Loss (IL), Chemical Oxygen Demand (COD) and Acid Volatile Sulfide (AVS) values were obtained from the sediment at St.2. The analysis of pore water from St.2 also showed the highest values of Total Organic Carbon (TOC), ammonia ($NH_4^+$), Dissolved Inorganic Nitrogen (DIN) and phosphate ($PO_4^{3-}$). These results are related to the fact that species dominance and richness is the highest in St.2.

• 한국해안해양공학회지
• /
• 제19권4호
• /
• pp.385-398
• /
• 2007

주문진항에서 2002년부터 2005년까지 월별로 관측한 일반 수질항목의 정점별, 계절별 변화 양상을 분석하였다. 분석항목은 수온, 염도, pH, SS, DO 항목이다. 일반수질항목의 상층·하층 변화는 뚜렷한 차이를 보이지 않는 것으로 파악되었다. 반면, 계절별 농도변화는 수온 및 DO 농도는 뚜렷한 변화양상을 보였으나, SS 항목 등은 불규칙한 양상을 보이고 있는 것으로 파악되었다. 또한, 지점별, 월별 자료를 영역별, 연도별로 평균하여 해수교환시설 및 하수종말처리시설의 수질개선효과를 정량적으로 분석하였다. 분석 결과, SS농도변화는 하수종말 처리시설 가동에 의한 영향이 매우 미미하게 반영되었으며, 해수교환시설에 의한 영향은 영역 1, 2 각각 26%, 16% 정도의 명확한 농도저감효과를 보이고 있는 것으로 파악되었다. 한편, DO 농도는 하수종말 처리시설 가동 후, 주문진항 내부영역에서 10% 내외로 농도가 저하되는 효과를 보였으나, 해수교환시설 건설 후에는 오히려 10% 내외 증가되는 양상을 보이고, 2005년도 DO 농도는 2002년도에 비하여 변화가 없는 것으로 파악되어 10% 내외의 DO 농도변화는 하수처리장 및 해수순환시설 설치효과로 파악하는 것보다는 자연적인 연변화 범위로 판단하는 것이 적절할 것으로 사료된다.

• Ocean and Polar Research
• /
• 제25권spc3호
• /
• pp.423-426
• /
• 2003

The seawater exchange breakwater equipped with an oscillating water channel and water transmitting pipes has a very spectacular function that seawater supply can be greatly increased due to the upsurge of the water surface inside the channel at resonance condition which can be reached when the incident wave period becomes close to the natural period of the channel. The variations of the water level and period inside the channel are very important factors in enhancing the efficiency of sea water exchange, especially when designing the breakwater cross-section in shallow water zone which requires longer resonance period with the elongated horizontal projection of the channel. In the present study, a hydraulic experiment was performed varying the length of the oscillating channel, and the resonance periods and water surface variations are analyzed in terms of water transmission through the pipes.

• 한국해안해양공학회지
• /
• 제9권2호
• /
• pp.86-96
• /
• 1997

진해만에서 천해전선의 형성 및 전선과 수질분포와의 관계를 해석하기 위해 해양학적인 조사가 수행 되었으며, 또한 Simpson-Hunter의 성층계수 log(H/U$^3$)을 수치계산하였다.인공위성 자료와 현지조사결과에 의하면, 진해만의 천해전선은 가덕수로 북쪽해역 부근에서 형성되며, 전선부근에서 성층계수 값은 2.0~2.5이다. 전선이 셩성되는 위치를 기준으로 했을 때 만의 외해역과 진해만 서부해역에서는 COD 농도가 2.0 mg/l 이하로 낮으나, 전선역의 북쪽 내해에 위치한 마산만에서는 3.0~5.5 mg/l로써 높다. COD 농도는 마산만에서 외해로 갈수록 강한 해수교환으로 인해 점차 감소한다. 하계 저층 무산소 및 저산소 수괴는 진해만 서부해역과 마산만에서 일어나며, DO 농도는 성층계수가 증감함에 따라 감소한다. DO 농도는 전선이 형성되는 해역을 기준으로 만외에서는 약 4.0 mg/l 이상으로 높으나, 만내에서는 낮다. 천해전선은 연안에서 외해로의 물질수송에 대해 중요한 역하을 하며, 또한 전선의 형성지역은 물리적 및 화학적으로 중요한 경계를 이루는 것 같다.

• 한국해안해양공학회:학술대회논문집
• /
• 한국해안해양공학회 2001년도 한국해안해양공학발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
• /
• pp.195-201
• /
• 2001

• 한국수산과학회지
• /
• 제44권6호
• /
• pp.622-629
• /
• 2011

We investigated the effect of the discharged water from Bong Stream, which is located in the drainage area of Gangjinman area on the bacteriological water quality in the coastal area after rainfall events. Following 12.5 mm of rainfall, water discharged from Bong Stream had a very limited effect on bacteriological water quality in adjacent area and the affected area did not extend to the designated area. On the other hand, after 23 mm rainfall, the density of fecal coliform at stations located in the designated area was higher than at stations located in the adjacent area. The degree of bacteriological contamination at the surveyed stations in the coastal area after rainfall events did not show a relationship with distance from the shoreline. These results indicate that the direction of spread and the range of contaminants from the drainage area were affected by tides at the time of the survey. Therefore, a detailed survey of the effects of tides on the diffusion characteristics of the contaminants from Bong Stream is needed to establish a proper management plan for the surveyed area.

• 한국해양환경ㆍ에너지학회지
• /
• 제3권3호
• /
• pp.41-49
• /
• 2000

수역의 수질개선을 위하여 생활하수, 산업폐수를 처리할 때 주로 BOD 또는 COD를 저하시키는데 주안점을 두어왔으나 제거되지 않은 질소와 인의 유입으로 인하여 해역은 부영양화가 진행되고 있다. 따라서 향후 수질을 개선하기 위해서는 조류증식의 제한인자인 질소와 인의 처리가 필요하다. 고차처리를 적용할 경우보다 건설비용과 유지관리비가 적게 소요되는 해중방류(Ocean Outfall)을 적용하였을 때 그 효과를 검토하였다. 남부하수처리장 2차처리수를 해중 방류했을 때 수영만 전역에 미치는 영향을 far-field 모델인 생태-유체역학 모델을 이용하여 예측한 결과, 과거 남부하수처리수가 해수면에 유입되던 용호만의 수질은 많은 개선을 보였으나 방류관 주변에서 무기질소와 인의 농도가 해역환경기준 III등급으로 적조나 부영양화의 가능성이 있는 것으로 나타났다.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제28권2호
• /
• pp.1-11
• /
• 2023

Groundwater-surface water interaction was evaluated using water quality parameters (temperature and electrical conductivity), distributions of stable water isotopes (δ²H and δ ¹⁸O), and Rn-222 in lagoon water, groundwater, and seawater at three coastal lagoons (Songji (SJ), Youngrang (YR), and Sunpo (SP) Lagoon) in South Korea. From the results of composition and distributions of δ²H and δ¹⁸O, it was found that groundwater fraction of lagoon water in YR Lagoon (76%) was slightly higher than those of SJ (42%), and SP (63%) Lagoon. Based on Rn-222 mass balance model, groundwater discharge into SJ Lagoon in summer 2020 was estimated to be (3.2±1.1)×10³ m³ day^-1, which showed a similar or an order of magnitude higher than the results of previous studies conducted in coastal lagoons. This study can provide advanced techniques to evaluate groundwater-surface water interaction in coastal lagoons, wetlands, and lakes, and help to determine the effects of groundwater on coastal ecosystems.

• 한국환경과학회지
• /
• 제7권3호
• /
• pp.321-326
• /
• 1998

The water Quality and phytoplankton communities of the coastal waters of Inchon were Investigated 4 tomes from May, 1995 to January. 1996. The characteristic of the study was shallow muddy bottom onoronment with high SS concentration. The water qualities were belong to the category of I-grade in DO, II to III grade in COD and III-grade In Inorganic nutrients such as T-N and T-p. Total 136 species of shytoplankton were observed in thins study and species richness was on the decrease compared with the results of previous studies. The mean of phytoplankton species diversities was 1.93, decreased in recent years and the value in autumn was slightly higher than that in other seasons.