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題 名 | A Preliminary Study of Volume Changes of Round Frame Cage Caused by Currents and Tides=圓框式箱網受海流與潮汐的容積變化之初探 |
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作 者 | 楊清閔; 黃星翰; 賴繼昌; 蘇宏盛; 翁進興; 吳龍靜; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 41:1 2014.03[民103.03] |
頁 次 | 頁49-60 |
分類號 | 439.3 |
關鍵詞 | 箱網; 網具變形; 潮汐; 箱網容積; Marine cage; Cage net deformation; Sea tides; Cage volume; |
語 文 | 英文(English) |
中文摘要 | 世界上海洋箱網養殖場已逐漸由內灣向外海發展,嚴峻的海況條件易影響箱網網具變形,造成養殖容積空間減少,不利養殖魚隻成長生存及降低生產效能。然而,運用實際箱網進行海況與容積變化之研究報告闕如。本研究以使用中箱網底部四端點的深度變化,進行當地海流與潮汐影響下之箱網袋網容積變化之實驗監測。結果顯示,箱網底部浮起與漲退潮及流向流速有關,凌晨2時至6時漲潮期,海流以東北流為主,箱網底部南端浮起2-4m,呈北端低南端高的傾斜狀態,容積減少率10-30%之間,容積減少最多為31.6%,即減少794 m3容積空間,下午漲潮期容積減少約5%-15%。南流強勁時,箱網底部北端較易浮起,因實際養殖場海況較為複雜,可依實際監測結果,改善現有箱網結構,以保有最大的養殖空間,提高生產的效能。 |
英文摘要 | Around the world, marine cage farming has evolved from inner bays to the open sea. However, the severe sea conditions are likely to affect cage net deformation resulting in reduced breeding capacity within the space. This causes an adverse impact on fish growth and lowers production efficiency. Unfortunately, none is known on the relationship between sea condition and cage volume change. Based on the depth changes of the four endpoints at the bottom of a cage, we conducted experimental monitoring of the cage net volume under the impact of sea currents and tides, and found that the cage bottom rise are related to the sea currents and tides. During the high tide period from 2 to 6 a.m., currents flow mainly in the direction of the northeast, thus, the southern end of the cage bottom rises about 2-4 m in a tilted state. This indicates that it is low in the northern end and high in the southern end. The volume reduction rate is in the range of 10-30%, and the maximum volume rate is up to 31.6%, meaning 794 m^3 of volume space. In the afternoon period of high tides, the volume reduction rate is about 5%-15%. When the current flow in the southward direction was stronger, the northern end of cage net would rise. As the sea conditions in the farming area are relatively complex, the cage structure can be improved according to the actual monitored results in order to ensure the maximum breeding space and improve production performance. |
本系統中英文摘要資訊取自各篇刊載內容。