随着海洋渔业的快速发展,集鱼灯作为一种生态友好、低碳且高效的关键设备,在提升捕捞效率方面发挥了重要作用。采用文献计量分析方法,对集鱼灯技术在过去二十年的发展趋势、主要贡献者及研究热点进行了系统研究。根据中文核心期刊数据库...随着海洋渔业的快速发展,集鱼灯作为一种生态友好、低碳且高效的关键设备,在提升捕捞效率方面发挥了重要作用。采用文献计量分析方法,对集鱼灯技术在过去二十年的发展趋势、主要贡献者及研究热点进行了系统研究。根据中文核心期刊数据库及Web of Science核心合集数据,考察了该领域的发文量、主要研究机构、学科领域、核心作者和主要研究方向等关键指标,全面展示了该领域的研究进展及研究重点的变化趋势,揭示了集鱼灯技术的演变路径。研究结果显示:1)该领域年发文量总体呈现波动上升的趋势,但在2018年后国内外发文量呈现相反的趋势。2)中国和日本是集鱼灯研究的主要贡献国,研究机构主要集中在沿海高校及科研院所。3)国内研究大致分为两个阶段,2004年至2013年偏重光诱捕捞的出海测试,而2012年至2022年则逐渐聚焦于集鱼灯合理配置、照度模型及照度分布等方面的研究。国际上,研究大致分为3个阶段:第一阶段(2003—2009年)聚焦于基础理论研究和早期技术探索;第二阶段(2010—2016年)转向节能减耗和光源技术革新,以响应环保需求的提升;第三阶段(2020年以后)关注集鱼灯性能优化及其生态影响,贴合全球可持续渔业发展的趋势。研究表明,集鱼灯技术已从传统光源逐步转向更加可持续、节能的技术,未来研究方向将集中在光因子对集群行为的深入研究、三维光场可视化技术的应用以及集鱼灯实际应用效能提升等方面。展开更多
This study experimentally investigates the hydrodynamic characteristics,geometric configurations,fluttering motions of the codend,and the instantaneous flow fields inside and around the codend,with and without a liner...This study experimentally investigates the hydrodynamic characteristics,geometric configurations,fluttering motions of the codend,and the instantaneous flow fields inside and around the codend,with and without a liner,under varying catch sizes and inflow velocities.A proper orthogonal decomposition method is employed to extract phase-averaged mean properties of unsteady turbulent flows from flow measurement data obtained using an electromagnetic current velocity meter inside and around the codend.The results reveal that as catch size increases,the drag force,codend motion,Reynolds number,and codend volume increase while the drag coefficient decreases.Owing to the codend shape and pronounced motion,a complex fluid–structure interaction occurs,demonstrating a strong correlation between drag force and codend volume.The oscillation amplitudes of the hydrodynamic forces and codend motions increase with increasing catch size,and their oscillations mainly involve low-frequency activity.A significant reduction in the flow field occurs inside and around the unlined codend without a catch.The flow field is 5.81%,14.39%,and 27.01%lower than the unlined codend with a catch,the codend with a liner but without a catch,and the codend with both a liner and a catch,respectively.Fourier analysis reveals that the codend motions and hydrodynamic forces are mainly characterized by low-frequency activity and are synchronized with the unsteady turbulent flow street.Furthermore,the proper orthogonal decomposition results reveal the development of unsteady turbulent flow inside and around the codend,driven by flow passage blockage caused by the presence of the liner,intense codend motions,and the catch.Understanding the hydrodynamic characteristics and flow instabilities inside and around the codend,particularly those associated with its fluttering motions,is crucial for optimizing trawl design and improving trawl selectivity.展开更多
文摘随着海洋渔业的快速发展,集鱼灯作为一种生态友好、低碳且高效的关键设备,在提升捕捞效率方面发挥了重要作用。采用文献计量分析方法,对集鱼灯技术在过去二十年的发展趋势、主要贡献者及研究热点进行了系统研究。根据中文核心期刊数据库及Web of Science核心合集数据,考察了该领域的发文量、主要研究机构、学科领域、核心作者和主要研究方向等关键指标,全面展示了该领域的研究进展及研究重点的变化趋势,揭示了集鱼灯技术的演变路径。研究结果显示:1)该领域年发文量总体呈现波动上升的趋势,但在2018年后国内外发文量呈现相反的趋势。2)中国和日本是集鱼灯研究的主要贡献国,研究机构主要集中在沿海高校及科研院所。3)国内研究大致分为两个阶段,2004年至2013年偏重光诱捕捞的出海测试,而2012年至2022年则逐渐聚焦于集鱼灯合理配置、照度模型及照度分布等方面的研究。国际上,研究大致分为3个阶段:第一阶段(2003—2009年)聚焦于基础理论研究和早期技术探索;第二阶段(2010—2016年)转向节能减耗和光源技术革新,以响应环保需求的提升;第三阶段(2020年以后)关注集鱼灯性能优化及其生态影响,贴合全球可持续渔业发展的趋势。研究表明,集鱼灯技术已从传统光源逐步转向更加可持续、节能的技术,未来研究方向将集中在光因子对集群行为的深入研究、三维光场可视化技术的应用以及集鱼灯实际应用效能提升等方面。
基金sponsored by the National Natural Science Foundation of China(Grant No.32373187)the Research Fund for International Scientists of the National Natural Science Foundation of China(Grant No.32350410404)the Natural Science Foundation of Shanghai(Grant No.23ZR1427000).
文摘This study experimentally investigates the hydrodynamic characteristics,geometric configurations,fluttering motions of the codend,and the instantaneous flow fields inside and around the codend,with and without a liner,under varying catch sizes and inflow velocities.A proper orthogonal decomposition method is employed to extract phase-averaged mean properties of unsteady turbulent flows from flow measurement data obtained using an electromagnetic current velocity meter inside and around the codend.The results reveal that as catch size increases,the drag force,codend motion,Reynolds number,and codend volume increase while the drag coefficient decreases.Owing to the codend shape and pronounced motion,a complex fluid–structure interaction occurs,demonstrating a strong correlation between drag force and codend volume.The oscillation amplitudes of the hydrodynamic forces and codend motions increase with increasing catch size,and their oscillations mainly involve low-frequency activity.A significant reduction in the flow field occurs inside and around the unlined codend without a catch.The flow field is 5.81%,14.39%,and 27.01%lower than the unlined codend with a catch,the codend with a liner but without a catch,and the codend with both a liner and a catch,respectively.Fourier analysis reveals that the codend motions and hydrodynamic forces are mainly characterized by low-frequency activity and are synchronized with the unsteady turbulent flow street.Furthermore,the proper orthogonal decomposition results reveal the development of unsteady turbulent flow inside and around the codend,driven by flow passage blockage caused by the presence of the liner,intense codend motions,and the catch.Understanding the hydrodynamic characteristics and flow instabilities inside and around the codend,particularly those associated with its fluttering motions,is crucial for optimizing trawl design and improving trawl selectivity.
