我国竹筴鱼中层拖网网具性能分析  

A primary study on characteristics of Chinese midwater trawls of Chilean jack mackerel(Trachurus murphyi)

作　　者：许永久[1] 张敏[1] 邹晓荣[1] 邹莉瑾[1] 

机构地区：[1]上海水产大学海洋学院,上海200090

出　　处：《上海水产大学学报》2008年第2期215-221,共7页Journal of Shanghai Fisheries University

基　　金：上海市捕捞学重点学科(T1101)建设项目;2006年农业部公海渔业资源探捕调查项目"东南太平洋(秘鲁外海)竹筴鱼资源探捕"

摘　　要：对目前生产使用的智利竹筴鱼拖网1 440 m×472.25 m(330.00 m)、163 2 m×496.25 m(387.00 m)两种网具进行水槽模型试验。结果如下:网口高度公式为:H=0.076CV-0.559 4。网具阻力公式为:R=0.089 9(d/a)LCV1.738。通过两种网具性能之间以及与以往狭鳕拖网网具分析比较,结果表明,(1)在拖速0.255 m/s,L/S=0.4时,1 440 m和1 632 m中层拖网,网口垂直高度可达79 m和77 m,与实船网具测试相符。在垂直扩张效果、袖端水平扩张比对网口扩张高度的影响、网具阻力等方面,1440网也优于1632型网具。(2)由于装置了柔性帆布扩张器,现行的1440型、1632型竹筴鱼拖网在垂直扩张效果、袖端水平扩张比等方面性能更佳。The 1440m ×472.25m （330.00m） and 1632m ×496.25m （387.00m） mid-water trawls, widely used for Chilean jack mackerel fishing in the southeast Pacific, were selected for the target net in model test. Based on the performances of two mid-water trawl models with 1：55 and 1：70 scale tested in towing tank, following results were obtained： The formula of headline of these nets is H = 0.076CV^-0.5594. The formula of drag of these nets is R = 0. 089 9（d/a）LCV^1.738. According to the comparative analysis between the two nets and previously used mid-water nets for haddock, the results were as follows ： （ 1 ） The vertical opening of net mouth was 79 m, 77 m for the two nets, when L/S = 0.4, and the speed was 0. 255 m/s. The results were in accordance with the research on board. The hydrodynamic performance （vertical opening, drag, horizontal spreading etc. ） of the net 1440 was better than the net 1 632. （2） The hydrodynamic performances of the currently used nets 1440, 1632 were highly improved after assembling the soft canvas.

关 键 词：中层拖网 模型试验 网口高度 网具阻力 

分 类 号：S972.13[农业科学—捕捞与储运]