基于广义加性模型研究影响罩网沉降性能的因子  

A study on settlement performance of falling-net based on GAM

作　　者：李杰[1] 张鹏[1] 王腾 晏磊[1] 杨炳忠[1] 陈作志[1] LI Jie;ZHANG Peng;WANG Teng;YAN Lei;YANG Bingzhong;CHEN Zuozhi(South China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences/Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture and Rural Affairs,Guangzhou 510300,China)

机构地区：[1]中国水产科学研究院南海水产研究所/农业农村部外海渔业开发重点实验室,广东广州510300

出　　处：《南方水产科学》2021年第4期74-81,共8页South China Fisheries Science

基　　金：农业部财政专项(NFZX2018);农业农村部外海渔业开发重点实验室开放基金(LOF 2019-02)。

摘　　要：为全面了解罩网网具沉降性能,为罩网模型试验的开展及渔具渔法的改进提供参考,该研究于2016年3月在南海中南部进行海上试验,采用多项式回归和广义加性模型(Generalized Additive Model, GAM)对罩网沉降性能进行分析研究。结果显示:1)自由沉降是影响网具总沉降深度的更为关键的因素。2) 90.0-119.9 s是较为适宜的自由沉降时间。3)自由沉降速度先短时间内增大后逐渐减小,最大值出现在沉降第10秒;阻尼沉降速度在前50 s相对稳定,之后迅速降低。4)自由沉降时间、风速、风流向夹角对自由沉降深度影响显著;自由沉降时间、风速、渔船漂流速度、风流向夹角对阻尼沉降深度影响显著。研究表明:1)风速、风流向夹角对自由沉降深度与阻尼沉降深度的影响是复杂且非线性的,它们可能通过波浪和改变船、网相对位置影响网具沉降。2)渔船漂流速度对阻尼沉降深度影响显著,它可能会影响罩网网口的闭合程度与网具绞收。In order to comprehensively understand the settlement performance of falling-net, as well as to provide references for the development of falling-net model test and improvement of fishing gear and method, we conducted sea trials in the central-southern South China Sea in March 2016, and studied the settlement performance of falling-net based on polynomial regression and Generalized Additive Model(GAM). The results show that: 1) Free settlement was a more critical factor affecting the total settlement depth.2) 90.0–119.9 s was an appropriate free settlement time based on the settlement performance of the falling-net. 3) The free settlement speed first increased in a short time and then decreased, the maximum value occurring at 10th s. The damping settlement speed remained relatively stable in the first 50 s with little change, but then decreased rapidly. 4) Free settlement time(Tf), wind speed(Sw),and direction angle between wind and current(α) had significant influences on free settlement depth. Tf, Sw, drift speed of fishing boat(Sb) and α h ad significant influences on damping settlement depth. The study suggests that: 1) The influences of Sw and α on free settlement depth and damping settlement depth are complex and non-linear, and may affect the settlement of falling-net through waves and changing the relative position between fishing boat and falling-net. 2) Sb has a significant influence on damping settlement depth. This may be caused by the fact that Sb affects the degree of closure of net-mouth and hauling of purse line.

关 键 词：罩网 沉降性能 广义加性模型 

分 类 号：S972.29[农业科学—捕捞与储运]