深水网格式锚碇网箱水动力特性研究
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摘要
为缓解海洋捕捞业的巨大压力,实施海洋渔业可持续发展战略,近年来深水网箱养殖在沿海地区已被广泛应用。深水网箱养殖的规模化、集约化和产业化已成为渔业结构调整的重要方向。由于深水网箱所处的海洋环境恶劣复杂,要求网箱系统具备较强的抗风浪能力,以保证整个网箱系统安全工作,尽可能地减少渔民的损失。在我国深水网箱国产化过程中,网箱锚碇系统的设计及在特定锚碇系统形式下网箱的水动力特性研究是首先要面对的问题。本论文研究工作依托国家自然科学基金项目及“863”计划合作项目。
     论文研究内容共有七部分组成:第一部分为绪论,主要介绍论文研究背景、国内外、深水网箱发展概况及研究进展。第二部分对网箱系统的各组成部分进行了物理模型试验设计。第三部分通过对四点锚碇、水下网格锚碇的网箱模型试验结果的统计分析,对深、水网箱的锚碇形式及波、流作用方向提出了合理建议。第四部分研究内容为设计了水下:网格式锚碇6种网箱组合模型,在单纯流作用情况下,测试了各模型网箱网前、网内及网后的流速值,通过统计分析研究了网格式锚碇网箱的阻流效应,为后续的数值模拟提供了流场成果。第五部分介绍了水下网格式锚碇网箱数值模拟的基本方法。第六部分利用数值模拟及模型试验相结合的方法对单个水下网格式锚碇网箱在单纯流、单纯波及波流共同作用情况下的水动力特性分别进行了研究,分析了网箱网格下潜深度及波流入射角度对网箱水动力特性的影响。第七部分设计了一种由两个单体网箱组合而成的水下网格式锚碇网箱模型,利用数值模拟及模型试验相结合的方法分析了组合式网箱在单纯流、单纯波及波流共同作用情况下网箱的水动力特性,并与单体网箱在相同工况下的水动力特性进行了比较。文章最后对本文取得的主要研究成果进行了总结,同时对今后深水网格式锚碇网箱水动力研究发展进行了展望。
In order to relieve the pressure of marine capture fisheries and implement the strategy of sustainable development of marine fisheries, deep-water cage industry has been developed rapidly in the coastal areas of our country recently. Net cage aquaculture of scale, intensification and industrialization has become an important direction of aquaculture development. Compared with net cage used in sheltered area, the net cage in open sea will resist more severe wave loading. For this reason, the deep-water cage is required to withstand severe conditions such as strong winds, currents and storms. The safety of cage system should be ensured, and then the loss of fishermen could be minimized. During the design of deep-water cage, the research on the mooring system design and hydrodynamic behaviors of cage under mooring system should be put in a significant place. The doctoral dissertation has been financially supported by the National 863 High Technology Project and National Natural Science Foundation Project.
     The contents are mainly composed of seven parts. The first part is a general introduction to the research background, the development and prospects of deep-water cage at home and abroad. The second part is about the design of physical model method. In the third part, according to the result analysis of model experiment about four-point mooring, under-water grid mooring net cage, the reasonal suggestion has been proposed on mooring types and direction of incident wave-current. The fourth part of the dissertation presents the design of six types of grid mooring net cage, the flow velocities in front of the net cage, behind the net cage and inside the net cage are measured. With the analyses of the data, flow-resistance effect of cage net is studied, which is a result of flow field for numerical simulation investigation afterwards. The basic method of numerical simulation investigation of net cage is presented in the fifth part. And in the sixth part, with the combination of the numerical simulation method and the model experiment, the hydrodynamic behavior of single under-water gird mooring net cage under the influence of current, wave and combined wave-current are studied. Based on the study, the effect of the submerged depth of net cage grid and direction of incident combined wave-current on hydrodynamic behavior of net cage is analyzed. In the seventh part, a model of under-water grid mooring net cage is designed, which is the combination of two net cages, to analyze the hydrodynamic behavior under the influence of current, wave and combined wave-current with the combination of the numerical simulation method and the model experiment, and compares the hydrodynamic behaviors between the double net cags and single net cage on same conditions.At last, the achievements of the study are summarized and the prospects of the study of hydrodynamic behavior of deep-water grid mooring net cage are also discussed.
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