水产学报2025，Vol.49Issue(5)：183-195,13.DOI:10.11964/jfc.20211013114
模拟渔获物重量对网囊水动力和振荡特性的影响
Effects of the simulated catch weight on the hydrodynamic and oscillation characteristics of the codend
摘要
Abstract
To investigate the relationship between hydrodynamic characteristics and catch weight inside the mid-water trawl codend,this study examined the effects of catch weights(0.00,1.68,3.36 and 5.04 kg)on the drag force,shape,and oscillation of codend under five different flow velocities(0.5,0.6,0.7,0.8 and 0.9 m/s)using flume tank experiment.The results show that:① the drag force of the codend increased with increasing flow velocity and catch weight.At lower flow velocities,the drag force of the codend with a catch weight of 1.68 kg was 30％greater than that of empty codend;② the shape of the codend structure tended to constrict with increasing flow velocity,while it expanded with increasing catch weight.However,the fish guiding area tightened and took on a"waist drum";③ the codend volume was directly proportional to the catch weight.When the catch weight increased to 5.04 kg,the codend volume was approximately 0.8 times that of the empty codend,indicating that the empty codend has the greatest volume.Under different catch weight,the periodicity and the amplitude of codend position oscillations decreased with increasing flow velocity.The codend position oscillations were fitted using a third-order Fourier series,yielding satisfactory results.These findings are expected to contribute to the optimization of the codend structure and provide relevant information for improving the hydrodynamic characteristics,geometric shape,and selectivity of the mid-water trawl codend.关键词
网囊/阻力特性/振荡特性/渔获物重量/形态Key words
codend/drag characteristic/oscillation characteristic/catch weight/shape分类
农业科技引用本文复制引用
唐浩,张锋,刘伟,叶旭昌,胡夫祥,许柳雄..模拟渔获物重量对网囊水动力和振荡特性的影响[J].水产学报,2025,49(5):183-195,13.基金项目
国家自然科学基金(32373187) （32373187）
上海市自然科学基金(23ZR1427000) National Natural Science Foundation of China(32373187) （23ZR1427000）
Shanghai Natural Science Foundation(23ZR1427000) （23ZR1427000）
