Experimental Study On The Hydrodynamic On The Aquaculture Purse Of The Three Different Floating Rope Frame

Senie aquaculture in shallow sea is an ecological seawater aquaculture model,the seine is mainly composed of the net clothing system,the frame system,the bottom end system and the mooring system.It is usually placed in open sea,to withstand the wind,wave,flow and other marine hydrological factors.Especially the floating rope fence will produce net deformation and even distortion in the rope to break disaster weather attacks,will cause the breeding facilities of aquaculture water,reduce safety performance decline until the facility destroyed huge damage.Therefore,it has the important practical significance to study the hydrodynamic characteristics of the Seine system,in order to design perfect fence aquaculture facilities,improve the facilities of the durability,safety and production efficiency.This research is according to the theory of mechanics and fishing gear,combined with the basic infrastructure conditions and hydrological conditions of shallow seine laying area,reference material of purse net culture,design and production of the three groups composed of different frame outline of aquatic breeding model,in moving the sink of model test study on flow,analysis of the hydrodynamic characteristics of the Seine.Comparative analysis of the dynamic characteristics of water type floating rope frame under different flow velocity,different angles and different water depth,mooring test and different mooring conditions at the bottom.Get the photo information at the same time through the digital camera shot in real time,combined with the shape of a purse seine relevant measuring method using image analysis software through a series of coordinate access and correction,a correct purse seine position is obtained.In the R programming language will be revised left were two-dimensional visualization appear,preliminary group 3 frame outline floating rope Seine model the side netting under different currents and different mooring angles deformation effects.Firstly,the experiments of the hydrodynamic characteristics of water tank test model framework have carried out,according to the actual production situation,according to field in fishing gear model must side and matsuda glue special standards.The seine cable model with 6 meters long was designed and produced,choosing the mooring method with adding tension.the experiments were carried in the sink of model test in Tokyo Ocean University in Japan.Analyzed the 2 framework classes and3 mooring hydrodynamic change rule.Test flow is uniform flow,the velocity respectively of 17 cm/s,23 cm/s,and 28 cm/s,35 cm/s,45 cm/s.Mooring Angle by Seine test respectively of 90 °,76 °,76 °,71 °,68 °,63 °,59 °.The water depth is1.35 M,1.2m.Preliminary get 3 groups Seine models under different flow conditions,framework classes and mooring exponential function and the flow of the model.Under the same experimental conditions,hydrodynamic and water relations were generally exponential function;force and mooring angle relation is complex,but in addition to 90°,the mooring rope force substantially decreased,and frame outline force in a certain range of changes in the beating,and depth reflect ebb tide in the actual sea,depth decreases,frame outline and mooring rope force maximum increase;water depth increases,the frame outline and mooring rope stress maximum value decreases.Specific results are as follows: Seine models framework classes and mooring hydrodynamic and velocity exponential relationship;In addition to 90°,mooring force and the mooring angle of the basic principles in inverse proportion,and the frame steel stress and mooring angle has no obvious correlation,it beats change within a certain range;The framework classes and mooring force with the decreasing water depth increases,the maximum when the water depth increases,the maximum stress less.Rectangular Seine float flow model test results show that: when moored angle is90°,with the increase of flow velocity,the maximum tension of the mooring rope is19.6N,the maximum tension of the frame is 1.5N;when the flow velocity is 45cm/s under different mooring angles,the maximum tension of the mooring rope is 19.6N,the maximum tension of the frame is 5.2N.Cylinder Seine float flow model test results show that: when the test depth is1.35 m,mooring angle is 90°,with the increase of flow velocity,the maximum tension of the mooring rope is 11.2N and the maximum tension of the frame is 7.8N;when the flow velocity is 45cm/s under different mooring angles,the maximum tension of the mooring rope is 12.7N and the maximum tension of the frame is 7.8N.When the test depth is 1.2m,mooring angle is 90°,with the increase of flow velocity,the maximum tension of the mooring rope is 12.4N and the maximum tension of the frame is 8.6N;when the flow velocity 45cm/s under different mooring angles,the maximum tension of themooring outline is 13.8N and the maximum tension of the frame is 8.6N.Spherical Seine float flow model test results show that: when the mooring angle is 90°,with the increase of flow velocity,the maximum tension of the mooring rope is19.2N and the maximum tension of the frame is 10.8N;when the flow velocity is45cm/s under different mooring angles,the maximum tension of the mooring rope is19.2N and the maximum tension of the frame is 11 N.Secondly,get the information of photos from the digital camera outside the tank wall,read the coordinates by using Plot digitizer image analysis software,modified nodes to coordinate the correct position,finally use R language of computer program written,read coordinate information,according to the requirements of the realization of two-dimensional visualization and system framework of net side fence and,by using the Polyaera formula in the Pracma module to calculate the side net area,3 sets of test Seine nets in different flow profile and different mooring angle of the reduction ratio,further indicating that 3 groups of floating rope fence frame hydrodynamic characteristics and stability,we can see that the stability of rectangular frame and purse seine float the float cylinder framework fence was superior to the spherical float frame fence.The results are follows:(1)The mooring angles on the seine model the side netting effects are as follows: cuboid float and cylinder Seine float at 45cm/s under different mooring angles,side netting area changed little,were less than 10%,cuboid seine float the side netting shrunk by 10%,and cylinder Seine float the side netting reduced to 6.8%.For the cylinder float,water depth conditions different did not affect the deformation of side net ease,netting structure still maintained a relatively stable.Comparison can clearly see,the ball float of Purse Seine side netting deformation by mooring angle influence greatly,when moored angle to 71%,netting area plummeted and mooring angle dwindled further,netting reduced the area is as high as nearly 30% or more.(2)The effects of flow velocity on the seine side of the net model are relatively small,the reduction in area is up to more than 10%.By the theory analysis of hydrodynamics model of three kinds of Seine purse,the flume experiment and the realization of 2d visualization,get neritic Seine facilities floating cable framework system of water dynamic variation and stability preliminary in order to provide theoretical basis and technical support for design,production,installation and application of the practical neritic seine.