文章摘要
唐浩,许柳雄,周成,朱国平,王学昉.基于GAM模型研究金枪鱼围网沉降性能影响因素[J].水产学报,2013,37(6):944~950
基于GAM模型研究金枪鱼围网沉降性能影响因素
Impact factors of sinking performance for tuna purse seine based on the generalized additive model
投稿时间:2012-09-15  修订日期:2013-02-12
DOI:10.3724/SP.J.1231.2013.38336
中文关键词: 金枪鱼围网,下纲,沉降性能,影响因素,GAM
英文关键词: tuna  purse seine, leadline, sinking  performance, impact factors , GAM
基金项目:国家“863”计划项目(2012AA092302)
作者单位E-mail
唐浩 上海海洋大学海洋科学学院 tanghao812@126.com 
许柳雄 上海海洋大学海洋科学学院 lxxu@shou.edu.cn 
周成 上海海洋大学海洋科学学院  
朱国平 上海海洋大学海洋科学学院  
王学昉 上海海洋大学海洋科学学院  
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中文摘要:
      金枪鱼围网是现代金枪鱼渔业中捕捞效率最高的方法,研究其沉降性能与影响因子之间的关系有利于提高围网捕捞效率。利用2011年9~12月金枪鱼围网渔船“金汇7号”在中西太平洋作业时所收集的数据,本研究分析了围网沉降深度(H)与放网时间(T),放网速度(V0),括纲(L)及跑纲(L1)的松放长度,10m、60m和120m三个水层流速(V10,V60及V120)等因子之间的关系,并利用广义可加模型(GAM)评价了各因子对沉降深度的影响。结果表明:(1)网具中部沉降深度与时间的关系为:H= -0.0002 t2 0.4086t 1.8099 (R2 = 0.9993);(2)沉降速度随着深度的增加而减小,网具中部沉降速度与时间的关系为:V = 2.5×10–7 t2 - 6×10–4 t 0.4412 (R2 = 0.9852);(3)GAM模型中的逐步回归分析表明,T、V60、V120和L四个因子对H有着显著的显著(P<0.05),且影响大小依此为V120、L、T和V60;(4)GAM模型分析表明,沉降深度随放网时间的增加而增大,放网时间集中在500~550s之间;流速的大小与沉降深度呈负相关;括纲投放长度主要集中在1800m左右。
英文摘要:
      Tuna purse seining is the most efficient fishing method in the modern tuna fisheries, this present study analyzed the sinking performance in tuna purse seines and its relationships with impact factors, which are beneficial to improve efficient fishing in tuna purse seines. Based on the data collected from the tuna purse seiner “JINHUI 7” operating in the Western and Central Pacific Ocean (WCPO) during September to December 2011, the present study analyzed the relationship between sinking depth (H) and other variables, including shooting duration (T), shooting velocity (V0), length of purse line (L) , length of ran line (L1) and current speed (V10, V60 and V120) of 10m, 60m and 120m layers, the impact factors on sinking depth are also estimated using the generalized additive model (GAM). The results show that (1) the relationship between the sinking depth (H) and time (t) for the middle section of leadline can be described by the formula H = -0.0002 t2 0.4086t 1.8099 (R2 = 0.9993). (2) the sinking speed decrease with the increasing depth, the relationship between the sinking speed (V) at the middle part of leadline and time (t) can be described using the formula V = 2.5 × 10-7 t2 - 6 × 10-4t 0.4412 (R2 = 0.9852). (3) the analysis of stepwise GAM shows that four factors have a significant impact on the sinking depth (P < 0.05) and the significance can be ordered by V120, L ,T and V60; (4) the analysis of GAM shows that the sinking depth increases gradually with the increasing shooting duration, which concentrates on the period of 500-550s; current speed has a negative correlation to the sinking depth; the length of purse line is mainly concentrated in about 1800m.
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