隋留洋, 黄小华, 刘海阳, 胡昱, 袁太平, 王绍敏, 陶启友. 系泊方式对深水养殖网箱动力特性影响研究[J]. 南方水产科学, 2021, 17(4): 98-108. DOI: 10.12131/20210049
引用本文: 隋留洋, 黄小华, 刘海阳, 胡昱, 袁太平, 王绍敏, 陶启友. 系泊方式对深水养殖网箱动力特性影响研究[J]. 南方水产科学, 2021, 17(4): 98-108. DOI: 10.12131/20210049
SUI Liuyang, HUANG Xiaohua, LIU Haiyang, HU Yu, YUAN Taiping, WANG Shaomin, TAO Qiyou. Effects of mooring pattern on dynamic characteristics of a deep-water aquaculture cage[J]. South China Fisheries Science, 2021, 17(4): 98-108. DOI: 10.12131/20210049
Citation: SUI Liuyang, HUANG Xiaohua, LIU Haiyang, HU Yu, YUAN Taiping, WANG Shaomin, TAO Qiyou. Effects of mooring pattern on dynamic characteristics of a deep-water aquaculture cage[J]. South China Fisheries Science, 2021, 17(4): 98-108. DOI: 10.12131/20210049

系泊方式对深水养殖网箱动力特性影响研究

Effects of mooring pattern on dynamic characteristics of a deep-water aquaculture cage

  • 摘要: 针对一种三角形高密度聚乙烯深水养殖网箱,该研究基于有限元法建立了波浪流作用下网箱动力响应计算模型,并通过开展模型比尺1∶15的水池试验,分析比较了网箱在纯波、波流组合条件下动力响应的计算结果与试验数据,两者相对误差均在10%以内。在此基础上,考虑原型网箱海况数据,将波流要素值取为:波高 (H) 4~6 m、周期 (T) 9 s、流速 (v) 0.5~1.5 m·s−1,分析了单点系泊和多点系泊方式浮架变形以及网箱系泊力的情况,并进一步探讨了系泊方式对网箱运动特性的影响。结果表明,波流作用下,多点系泊布置时的系泊力峰值大于单点系泊情况,且随着流速和波高的增加,两者相差幅度增大;在大浪强流条件(H=6 m, T=9 s, v=1.5 m·s−1)下,多点系泊能在一定程度上降低浮架的变形;2种系泊方式对浮架的升沉影响极小,但多点系泊时浮架在x轴上的位移大于单点系泊时,两者峰值相差25.64%;单个周期内网衣平面轮廓图显示网衣的变形程度几乎一致。

     

    Abstract: We established a numerical model for calculating the dynamic characteristics of a triangular high-density polyethylene (HDPE) deep-water aquaculture cage in waves and current based on the Finite Element Method. To verify the accuracy of the numerical model, we carried out a series of physical model tests on the single-point mooring (SPM) cage under the conditions of pure wave and combined wave-current, in which the model scale was set at 1∶15. The relative error between the numerical and experimental results was within 10%. Afterwards, considering the sea state of the prototype cage, the calculated parameters for waves and currents were as follows: wave height 4–6 m, period 9 s, current velocity 0.5–1.5 m·s−1. We analyzed the deformation of the floating collar and the mooring force of the cage with single-point mooring (SPM) and multiple-point mooring (MPM). Besides, we discussed the effect of the mooring pattern on the motion characteristics of the cage. The results show that under the conditions of wave and current, the peak value of MPM force was higher than that of SPM force, and the difference became greater with the increase of velocity and wave height. Under the condition of severe waves and strong currents, the MPM system could reduce the deformation of the floating collar. However, the mooring pattern had little influence on the heave of the cage collar. For the MPM system, the x-axis displacement of the collar was greater than that of the SPM system, in which the difference was 25.64%. During a wave period, the xz plane profiles of the net deformation under sea conditions were almost the same for the two different mooring systems.

     

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