文章摘要
桂福坤,孟昂,陈天华,张清靖.筏式吊耳养殖系统水力特性及布局影响[J].水产学报,2017,41(10):1599~1608
筏式吊耳养殖系统水力特性及布局影响
Hydrodynamic characteristics of raft-style lug aquaculture system and the influence of arrangement
投稿时间:2016-07-28  修订日期:2016-10-13
DOI:10.11964/jfc.20160710497
中文关键词: 筏式养殖|水动力特性|负重|浮球形式|角度
英文关键词: raft culture|hydrodynamic characteristics|hanging weight|float ball pattern|angle
基金项目:国家海洋公益性行业科研专项(201505025-2);国家自然科学基金(31602205,51239002);北京市农科院科技创新能力建设专项(KJCX20151203,20161502-3)
作者单位E-mail
桂福坤 浙江海洋大学, 国家海洋设施养殖工程技术研究中心, 浙江 舟山 316022 gui2237@163.com 
孟昂 浙江海洋大学, 国家海洋设施养殖工程技术研究中心, 浙江 舟山 316022  
陈天华 浙江海洋大学, 国家海洋设施养殖工程技术研究中心, 浙江 舟山 316022  
张清靖 北京市水产科学研究所, 渔业生物技术北京市重点实验室, 北京 100068  
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中文摘要:
      深水延绳式筏式吊耳养殖系统属于典型的柔性多自由度海上结构物,通过数值模拟和模型实验相结合的方法,探讨了系统负重、浮球形式和布置角度对筏式系统水力特性的影响。结果显示,系统负重和布置角度均对筏式吊耳养殖系统的受力和运动特性有显著的影响,绠绳位移与负重呈负相关关系,绠绳位移随着负重的增大而减小;增大负重将明显增大绠绳、后锚绳、浮球系绳和吊绳的受力,而前锚绳受力随负重增大而减小,但幅度较小。浮球形式对筏式吊耳养殖系统的运动和受力影响很小,可以忽略;锚绳受力和绠绳位移与布置角度在0°~60°内呈正相关关系,都随着布置角度的增大而增大,在60°~90°内锚绳受力和绠绳位移与布置角度呈负相关关系,随着布置角度增大而减小。绠绳、浮球系绳、吊绳受力受布置角度影响较小。以上研究结果可为深水延绳式筏式吊耳养殖系统结构设计和安全性能评估提供参考。
英文摘要:
      Raft aquaculture is one of the popular farm modes for growing aquatic product in the ocean. However, tough conditions in the open ocean often impose severe damages on the raft systems. Therefore, comprehensive studies on the mechanics of the raft systems exposed to waves will greatly give help to optimizing raft system design and construction. This paper focuses on the mechanics of a typical long-line raft lug aquaculture system under wave conditions. In this paper, the numerical simulation was used for this study. The raft system was assumed as a flexible structure which was composed of nodes connected with springs. Wave forces on the rope and floating balls were calculated using Morison equations. Second order differential equations were established based on Newton's second law. The equations were resolved using fourth-order Runge-kutta method to find out the inner tension force and displacement of each element. It was found that free-weight and system angle have an effect on long-line rope aquaculture facility. Long-line displacement is negatively related with free-weight. The displacement of long-line decreased as free-weight increased.The force of long-line, back anchor rope, float ball rope and lifting rope increased as free-weight increased. But the force of front anchor rope decreased as free-weight increased. Float ball pattern had little impact on the system's movement and force. Anchor rope force and the displacement of long-line had positively correlated relationship with system angle at 0° to 60°. They increased as the angle increased. Anchor rope force and the displacement of long-line had negative correlated relationship with angle at 60° to 90°. They decreased as the system angle increased. The force of long-line, float ball rope, the lifting rope affected by the system angle is small. The results have important significance on evaluating the safety of the raft culture system. Deep-water long-line rope aquaculture facility belongs to the typical flexible multi degree of freedom offshore structures, and this research results can provide the reference for designing deep-water long-line rope aquaculture facility and safety evaluation. But the hydrodynamic characteristics of the deep-water long-line rope aquaculture facility are related to its structure and environmental factors, therefore we need specific conditions and specific analysis in the raft system designing and safety assessment.
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