Application of numerical simulation for analysis of sinking characteristics of purse seine

Stick-held dip (SHD) net is an effective fishing gear target for catching the Pacific saury. In this study, the hydrodynamic performance of an SHD net in current was investigated by means of numerical simulation and experimental test, and a mathematical model based on the lumped-mass method and principle of rigid body kinematics was developed to predict the net shape and tension of the cable. A series of physical model tests based on Tauti’s law and full-scale measurements at sea were conducted to evaluate the applicability of the numerical model. The results showed that the prediction performance of the numerical model was good, with a mean relative error of approximately 20% among the numerical, experimental, and field measured data. The dynamic shooting behavior of the SHD net at different current velocities and the effects of the length of the hauling rope and the mesh size on the net shape and tension of the cable were analyzed using the numerical simulation approach. When the current velocity increased from 0.12 to 0.46 m/s, the enclosed volume of the SHD net decreased by 62.9%. The height of net opening increased by 9.29% to 13.53% for every 10% increase in the length of the hauling rope from 0.96 to 1.44 m. With the increase in mesh size from 24 to 30 and 35 mm, the sinking depth and speed of the net increased, and the tension force of the cables decreased by 9.02% and 12.10%, respectively. The results suggested that (1) the numerical model could realistically represent the hydrodynamic characteristics of the SHD net; (2) the suitable operation current velocity is below 0.60 m/s; (3) the reasonable length of the hauling rope is about 30 m; and (4) the mesh size of the main netting could be increased to 30 mm.

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“…The drag coefficient C D and lift coefficient C L are estimated by (Zhou et al, 2015;Zhou and Xu, 2018):…”

Section: Motion Equationsmentioning

confidence: 99%

Numerical and experimental investigation on hydrodynamic performance of the stick-held dip net in Pacific saury fishery

Song

Hua

et al. 2022

Front. Mar. Sci.

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“…Ecologists have attempted to explore the effects of different environmental conditions on macrobenthos communities by developing a variety of models or statistical methods suitable for understanding the community- and population-scale distributions of environmental factors [ 13 , 14 ]. The generalized linear model (GLM) can be used to fit regression models for univariate response data.…”

Section: Introductionmentioning

confidence: 99%

The Application of the Generalized Additive Model to Represent Macrobenthos near Xiaoqing Estuary, Laizhou Bay

Liu,

Li,

Zhu

et al. 2023

Biology

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Macrobenthos is widely used as an indicator of ecological health in marine monitoring and assessment. The present study aimed to characterize the interrelationships between the distribution of the macrobenthos community and environmental factors near Xiaoqing Estuary, Laizhou Bay. Responses of species richness to environmental factors were studied using the generalized additive model (GAM) and the Margalef diversity index (dM) as indicators of species diversity instead of individual indicator species. Six factors were selected in the optimal model by stepwise regression: sediment factors (organic matter, phosphate, nitrate nitrogen, and ammonium nitrogen) and water factors (salinity, and ammonium nitrogen). The response curves generated by the GAM showed a unimodal relationship among taxa diversity, salinity in water, and sediment organic matter. dM was positively correlated with ammonium nitrogen in water and was negatively correlated with phosphate in the sediment. The model optimized by forward stepwise optimization explained 92.6% of the Margalef diversity index with a small residual (2.67). The model showed good performance, with the measured dM strongly correlated with the predicted dM (Pearson R2 = 0.845, p < 0.05). The current study examined the combined influence of multiple eco-factors on macrobenthos, and the Margalef diversity index of macrobenthos was predicted by the GAM model in a salinity-stressed estuary.

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A method for improving the simulation efficiency of trawl based on simulation stability criterion

et al. 2016

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Application of numerical simulation for analysis of sinking characteristics of purse seine

Cited by 3 publications

References 18 publications

Numerical and experimental investigation on hydrodynamic performance of the stick-held dip net in Pacific saury fishery

Numerical and experimental investigation on hydrodynamic performance of the stick-held dip net in Pacific saury fishery

The Application of the Generalized Additive Model to Represent Macrobenthos near Xiaoqing Estuary, Laizhou Bay

A method for improving the simulation efficiency of trawl based on simulation stability criterion

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