가막만의 해양환경과 굴양식장에 미치는 바람효과 = Wind Effect on the Marine Environment and Oyster Farms in Gamak Bay

다국어 초록 (Multilingual Abstract)

A two-dimensional numerical experiment has been conducted in order to elucidate the influence of wind stresses on the flow and water quality in a semi-enclosed shallow bay, Gamak Bay, Korea. In the summer (wind : 202.5?, 3.7 m/s), the flow becomes stronger than in the case of no wind, although the whole pattern of the flow looks similar to the case of no wind. In the autumn (wind : 45.0?, 4.3 m/s), the whole flow appears to be much stronger than in any other season and in particular, a pair of anticlockwise and clockwise vortices are created in the northwest region. Consequently, the wind in the autumn seems beneficial not only to relieve the water pollution but also to grow oysters, since the flow is much more energetic. In the winter (wind : 315?, 5.6 m/s), a southward flow appears to dominate over the entire coastline, except for some minor eddies around islands. Therefore, the monsoons in the autumn and in the winter encourage the seawater exchange since the southward flow becomes stronger while the monsoon in the summer discourages the seawater exchange since the southward flow is restrained.
The distribution of Chl-a concentration appears to be a little higher at the east coast than west coast of the bay. According to the calculating results, oyster farms with a high productivity (over 1300 kg per hanging string of 100 m) are distributed just in line with the concentration about 4 (ig/n of Chl-a. In addition, the majority of oyster farms tends to be densely distributed around the areas where the concentration of DO is high. They suggest that the productivity of oyster farms is closely related to the concentrations of DO or Chl-a. Also, the northwest regions of the bay, where oxygen deficient water masses appear in the summer season, turn out that there are weak residual currents less than 1 cm/sec. In the future, more precise approaches, taking drag forces caused by farming facilities into account, are required to identify major environmental factors on the oyster mariculture.

목차 (Table of Contents)

• 목차
• List of Tables = i
• List of Figures = ii
• Abstract = vi
• 1. 서론 = 1
• 1.1 연구배경 = 1
• 1.2 기존의 연구결과 = 3
• 1.3 연구목적 = 4
• 2. 자료 및 방법 = 6
• 2.1 자료 = 6
• 2.2 연구방법 = 8
• 3. 수치실험 = 11
• 3.1 기초방정식 = 11
• 3.1.1 유체역학 방정식 = 11
• 3.1.2 물질수송 방정식 = 14
• 3.2 계산조건 및 계산방법 = 19
• 3.2.1 해수유동 계산을 위한 경계조건 및 입력자료 = 19
• 3.2.2 DO 농도의 계산 = 20
• 3.3 수치 모형의 검증 = 23
• 3.4 계산결과 = 27
• 3.4.1 계절에 따른 흐름의 특성 = 27
• 1) 바람의 영향을 고려하지 않은 경우 = 30
• 2) 바람의 영향을 고려한 경우 = 30
• (1) 하계 = 30
• (2) 추계 = 33
• (3) 동계 = 33
• 3.4.2 계절에 따른 DO 농도분포의 변화 = 36
• 1) 바람의 영향을 고려하지 않은 경우 = 44
• 2) 바람의 영향을 고려한 경우 = 48
• (1) 하계 = 48
• (2) 추계 = 48
• (3) 동계 = 51
• 4. 가막만의 해양환경과 굴양식 어장환경과의 관계 = 56
• 4.1 계절에 따른 해수유동구조와 수질환경과의 관계 = 56
• 4.2 계절에 따른 해수유동구조와 저서환경과의 관계 = 60
• 4.3 계절에 따른 DO 농도분포와 굴양식 어장환경과의 관계 = 63
• 4.4 계절에 따른 Chl-α 농도분포와 굴양식 어장환경과의 관계 = 64
• 5. 결론 및 앞으로의 과제 = 71
• 참고문헌 = 74
• 감사의 글 = 79