| 网线直径和模拟渔获物对拖网网囊水阻力及形态影响 |
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| 引用本文： | 唐浩,张馨茹,朱安然,刘伟,孙秋阳,张锋,朱美熹,许柳雄.网线直径和模拟渔获物对拖网网囊水阻力及形态影响[J].上海海洋大学学报,2022,31(3):770-780. |
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| 作者姓名： | 唐浩 张馨茹 朱安然 刘伟 孙秋阳 张锋 朱美熹 许柳雄 |
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| 作者单位： | 上海海洋大学,上海海洋大学,上海海洋大学,上海海洋大学,上海海洋大学,上海海洋大学,上海海洋大学 |
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| 基金项目： | 国家自然科学基金;上海市青年科技英才扬帆计划资助 |
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| 摘 要： | 为探究网线直径和渔获物对拖网网囊水阻力及形态的影响，本研究利用上海海洋大学循环动水槽对3顶不同网线直径（1.11 mm、0.96 mm、0.54 mm）的网囊结构在5种流速（0.5 m/s、0.6 m/s、0.7 m/s、0.8 m/s、0.9 m/s）和2种渔获状态（空网、存在渔获物）下进行试验，比较分析各条件下网囊形态、水阻力和横向缩结系数的变化。结果表明：1）空网条件下，网囊阻力系数随网线直径的增大而增大；随雷诺数的增加，阻力系数呈减小的趋势。2）网囊水阻力与流速、网线直径和渔获量呈正相关关系。3）存在模拟渔获物网囊随着网线直径的增大，中部宽度增大；随着流速的增加，网囊长度的增加较空网网囊更为明显；空网网囊整体形态较饱满。4）空网网囊横向缩结系数先减小后趋于平缓，而存在模拟渔获物网囊横向缩结系数先减小后增至最大。本研究结果可为改善拖网网囊水动力性能，提高渔具的作业特性及选择性提供科学基础依据。
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| 关 键 词： | 网囊 网线直径 渔获物 阻力 形态 |
| 收稿时间： | 2022/3/16 0:00:00 |
| 修稿时间： | 2022/4/25 0:00:00 |
Effects of twine diameter and catch on drag and configuration of trawl codend |
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| TANG Hao,ZHANG Xinru,ZHU Anran,LIU Wei,SUN Qiuyang,ZHANG Feng,ZHU Meixi,XU Liuxiong.Effects of twine diameter and catch on drag and configuration of trawl codend[J].Journal of Shanghai Ocean University,2022,31(3):770-780. |
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| Authors: | TANG Hao ZHANG Xinru ZHU Anran LIU Wei SUN Qiuyang ZHANG Feng ZHU Meixi XU Liuxiong |
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| Institution: | Shanghai Ocean University,Shanghai Ocean University,Shanghai Ocean University,Shanghai Ocean University,Shanghai Ocean University,Shanghai Ocean University,Shanghai Ocean University |
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| Abstract: | In order to explore the effects of drag and configuration for twine diameter and catch on the trawl cod-end, three codend models with different twine diameters (1.11 mm, 0.96 mm, 0.54 mm) and catch (empty codends and codends with catch) under five current speeds (0.5 m/s, 0.6 m/s, 0.7 m/s, 0.8 m/s, 0.9 m/s) were carried outfor model test to compare and analyze the changes of configuration, drag and the horizontal hanging ratio of codends in the flume tank of Shanghai Ocean University. The results show that: (1) For empty codends, the drag coefficient of codend increases with the increase of twine diameter. With the increase of Reynold number, the drag coefficient decreases. (2) There is a positive correlation between codend resistance and flow velocity, twine diameter and catch. (3) The middle width of codend with catch increases with the increase of twine diameter. Compared with empty codends, the length of codends with catch increases obviously with the increase of flow velocity. While the overall configuration of empty codends is full. (4) The horizontal hanging ratio of empty codends decreases first and then tends to be stable, while the horizontal hanging ratio of codends with catch decreases first and then increases to the maximum. The results of this study can provide scientific basis for improving the hydrodynamic performance of mid-water trawl codend and the operation characteristics and selectivity of fishing gear. |
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| Keywords: | codend twine diameter catch drag force configuration of codends |
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