Equipment and method for underwater observation of target intensity of large jellyfish at different attitude angles

Abstract

The invention relates to the technical field of jellyfish detection, and discloses a device and method for underwater observation of target intensities of different attitude angles of a large jellyfish, the device comprises a net cage, a constraint assembly and an attitude adjusting assembly are arranged in the net cage, the constraint assembly comprises a support and two connecting lines, the two connecting lines penetrate through umbrella parts of the jellyfish, and the support is connected with the attitude adjusting assembly. And the end parts of the two connecting wires are fixedly connected with the bracket. According to the jellyfish posture adjusting device, the restraining assembly composed of the steel pipe and the connecting line is arranged, the jellyfish is fixed underwater through the restraining assembly to pull the first pulling rope or the second pulling rope, the angle of the restraining assembly is adjusted through the posture adjusting assembly, and therefore the purpose that the jellyfish posture angle is more convenient to adjust is achieved; conditions are provided for the underwater sonar to observe the target intensities of different attitude angles of the jellyfish, and the relative positions of the constraint assemblies are relatively fixed, so that the target intensities of the different attitude angles of the jellyfish can be measured repeatedly, and the measurement result is more accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of jellyfish detection, and particularly to a device and method for observing the target strength of large jellyfish with different attitude angles underwater. Background Art

[0002] Using sonar to detect jellyfish underwater and obtain target strength information can help scientists more effectively quantify and monitor the quantity and distribution of jellyfish, which is of great significance for understanding and managing jellyfish bloom events in the marine ecosystem.

[0003] There have been many achievements in foreign countries regarding the measurement of the target strength of various jellyfish, including measurements in pools and at sea; however, there is relatively little basic measurement work on the target strength of jellyfish in China, and foreign models and measurement results are often borrowed or directly applied. Since there may be certain differences in the target strength measurement results among different jellyfish species, among individuals of the same species but different sizes, and even among different measurement methods, directly using foreign measurement results without considering detection equipment, frequency conditions, etc. may cause large deviations when conducting echo integration / counting method statistics on the detected jellyfish quantity or statistics on the classification of jellyfish.

[0004] Currently, in the relevant field, due to the difficulty of adjusting the attitude angle of jellyfish underwater, it is extremely difficult to study the target strength of jellyfish with different attitude angles. Therefore, there are relatively few relevant studies, and the obtained results will generate noise signals other than jellyfish due to technical limitations, resulting in insufficient usability of the results. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that it is difficult to adjust the attitude angle of jellyfish underwater when studying the target strength of jellyfish with different attitude angles, and to propose a device and method for observing the target strength of large jellyfish with different attitude angles underwater.

[0006] To achieve the above purpose, the present invention adopts the following technical solution: A device for observing the target strength of large jellyfish with different attitude angles underwater, including a net cage, in which a constraint component and an attitude adjustment component are arranged. The constraint component includes a bracket and connecting lines. Two connecting lines pass through the umbrella part of the jellyfish, and the ends of the two connecting lines are fixedly connected to the bracket.

[0007] The attitude adjustment component includes a pulley, a first towing rope, and a second towing rope. The pulley is rotatably installed on the upper side of the net cage. The first towing rope and the second towing rope are wound around the surface of the pulley, and the bottom ends of the first towing rope and the second towing rope are respectively fixedly connected to both sides of the bracket. When the first towing rope or the second towing rope is tightened, the angle of the constraint component is adjusted, so as to achieve the purpose of more convenient adjustment of the jellyfish attitude angle, providing conditions for underwater sonar to observe the target strength of jellyfish with different attitude angles.

[0008] Preferably, the bracket includes two steel pipes of equal length. The two steel pipes are arranged in parallel, the two connecting lines are arranged in parallel, and the two ends of the two connecting lines are respectively fixedly connected to the two steel pipes. The bottom ends of the first towing rope and the second towing rope are respectively fixedly connected to the two ends of the steel pipes. There are two sets of attitude adjustment components. The two steel pipes are suspended in the net cage through the two sets of attitude adjustment components. With this design of the constraint component, the two steel pipes are located on the left and right sides of the jellyfish, facilitating the arrangement of sonar measurement equipment on the upper side and the front and back sides of the jellyfish.

[0009] Preferably, suspension lines are fixedly installed at the centers of gravity of the two steel pipes. Two cantilever rods of equal height are fixedly installed on the inner wall of the net cage. The top ends of the suspension lines are fixedly connected to the cantilever rods, and counterweights are fixedly connected to the bottom ends of the suspension lines. The suspension lines prevent the steel pipes from moving horizontally and vertically and keep the connecting lines in a taut state at the same time.

[0010] Preferably, the connecting lines, the first towing rope, the second towing rope, and the suspension lines are all made of fishing lines, which can avoid generating additional scattering.

[0011] The present invention also proposes a method for observing the target strength of large jellyfish in different attitude angles underwater, including the following specific steps:

[0012] Step 1: Preparation of materials

[0013] a) Steel needles: The length of the steel needles should ensure that they can pass through the umbrella part of the jellyfish.

[0014] b) Fishing lines: The diameter of the fishing lines should be such that, according to the size and type of the jellyfish, the pressure exerted by the fishing lines on the jellyfish will not cause the jellyfish to rupture.

[0015] c) Steel pipes: The length of the steel pipes is less than the diameter of the jellyfish.

[0016] d) Net cage, pulleys, counterweights

[0017] Step 2: Assembly

[0018] Prepare two fishing lines of equal length as connecting lines. Install steel needles at one end of the connecting lines, pass them through both sides of the jellyfish's umbrella part, then remove the steel needles, and tie the two ends of the connecting lines to the two steel pipes respectively.

[0019] Prepare four fishing lines of equal length as two sets of the first towing rope and the second towing rope. The first towing rope and the second towing rope are wound around the surface of the pulley. The bottom ends of the first towing rope and the second towing rope are respectively fixedly connected to the two ends of the steel pipes, suspending the two steel pipes in the net cage.

[0020] Prepare two fishing lines of equal length as suspension lines. The suspension lines are tied to the centers of gravity of the steel pipes. The top ends of the suspension lines are fixedly connected to the cantilever rods, and counterweights are fixed to the bottom ends of the suspension lines.

[0021] Step 3. Adjustment of attitude angle

[0022] The line connecting the centers of gravity of the two steel pipes is the rotation axis. Pull the first towing rope and release the second towing rope, and the two steel pipes rotate clockwise with the rotation axis as the center; or release the first towing rope and tighten the second towing rope, and the two steel pipes rotate counterclockwise with the rotation axis as the center.

[0023] Step 4. On the upper side of the net cage, use an EK80 fish finder to measure the target strength of jellyfish at different attitude angles.

[0024] The present invention has the following beneficial effects:

[0025] 1. The equipment for observing the target strength of large jellyfish at different attitude angles underwater proposed by the present invention fixes the jellyfish underwater by setting a constraint component composed of steel pipes and connecting lines, and adjusts the angle of the constraint component through an attitude adjustment component, so as to achieve the purpose of more convenient adjustment of the jellyfish attitude angle, and provide conditions for underwater sonar to observe the target strength of jellyfish at different attitude angles.

[0026] 2. By installing a suspension line at the center of gravity of the steel pipe, the upper end of the suspension line is connected to the cantilever rod, and a counterweight is suspended at the bottom of the suspension line. Its function is to prevent the steel pipe from moving horizontally and vertically, and at the same time keep the connecting line in a tensioned state, that is, to make the relative position of the constraint component relatively fixed, so as to measure the target strength of jellyfish at different attitude angles, which can be repeated, reduce the difference in target strength measurement data, and make the measurement results more accurate and reliable.

[0027] 3. By suspending the steel pipe with a suspension line and adjusting the suspension height of the two suspension lines on the steel pipe, the plane formed by the two steel pipes can be adjusted horizontally or obliquely. When the first towing rope or the second towing rope is tightened, the jellyfish is flipped in a horizontal or inclined posture, so that the fish finder can measure more target strength data at different attitude angles on the upper side or side of the net cage, making the established target strength model more comprehensive and meeting the application requirements of static horizontal observation and underway vertical observation. Description of the Drawings

[0028] Figure 1 It is a three-dimensional structure diagram (1) of the equipment proposed by the present invention;

[0029] Figure 2 It is a three-dimensional structure diagram (2) of the equipment proposed by the present invention;

[0030] Figure 3 It is a front view structure diagram of the equipment proposed by the present invention;

[0031] Figure 4 It is a side view structure diagram of the equipment proposed by the present invention.

[0032] In the figure: 1 net cage, 2 connecting line, 3 pulley, 4 first towing rope, 5 second towing rope, 6 suspension line, 7 cantilever rod, 8 counterweight, 9 steel pipe. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] Refer to Figures 1-4 , a device for observing the target strength of large jellyfish in different attitude angles underwater, including a net cage 1. A constraint component and an attitude adjustment component are arranged in the net cage 1. The constraint component includes a bracket and a connecting line 2. Two connecting lines 2 pass through the umbrella part of the jellyfish, and the ends of the two connecting lines 2 are fixedly connected to the bracket.

[0036] The attitude adjustment component includes a pulley 3, a first towing rope 4 and a second towing rope 5. The pulley 3 is rotatably installed on the upper side of the net cage 1. The first towing rope 4 and the second towing rope 5 are wound around the surface of the pulley 3, and the bottom ends of the first towing rope 4 and the second towing rope 5 are respectively fixedly connected to both sides of the bracket.

[0037] Specifically, refer to Figure 2 , the bracket includes two steel pipes 9 of equal length. The two steel pipes 9 are arranged in parallel. The two connecting lines 2 are arranged in parallel, and the two ends of the two connecting lines 2 are respectively fixedly connected to the two steel pipes 9.

[0038] In this embodiment, suspension lines 6 are fixedly installed at the center of gravity of the two steel pipes 9. Two cantilever rods 7 of equal height are fixedly installed on the inner wall of the net cage 1. The top ends of the suspension lines 6 are fixedly connected to the cantilever rods 7, and counterweights 8 are fixedly connected to the bottom ends of the suspension lines 6. When the suspension lines 6 are installed, the top ends of the suspension lines 6 on both sides are far away from each other, and the suspension lines 6 provide an outward acting force for the steel pipes 9 to make the connecting lines 2 in a tensioned state.

[0039] The bottom ends of the first towing rope 4 and the second towing rope 5 are respectively fixedly connected to both ends of the steel pipe 9. There are two sets of attitude adjustment components. The two steel pipes 9 are suspended in the net cage 1 through the two sets of attitude adjustment components. Among them, the connecting line 2, the first towing rope 4, the second towing rope 5 and the suspension line 6 are all made of fishing line. The fishing line can avoid additional scattering of sound waves. With the design of this restraint component, the two steel pipes 9 are located on the left and right sides of the jellyfish, facilitating the arrangement of sonar measurement equipment on the upper side and the front and back sides of the jellyfish.

[0040] The equipment for observing the target strength of large jellyfish at different attitude angles underwater proposed by the present invention fixes the jellyfish underwater by setting a restraint component composed of a steel pipe 9 and a connecting line 2, and adjusts the angle of the restraint component through an attitude adjustment component, so as to achieve the purpose of more conveniently adjusting the attitude angle of the jellyfish, providing conditions for observing the target strength of the jellyfish at different attitude angles by underwater sonar.

[0041] In the present invention, a suspension line 6 is installed at the center of gravity of the steel pipe 9. The upper end of the suspension line 6 is connected to the cantilever rod 7, and a counterweight 8 is suspended at the bottom of the suspension line 6. Its function is to prevent the steel pipe 9 from moving horizontally and vertically, and at the same time keep the connecting line 2 in a tensioned state, that is, to make the relative position of the restraint component relatively fixed, so as to measure the target strength of the jellyfish at different attitude angles, which can be repeated, reduce the difference in the measured target strength data, and make the measurement results more accurate and reliable.

[0042] The present invention also proposes a method for observing the target strength of large jellyfish at different attitude angles underwater, including the following specific steps:

[0043] Step 1: Preparation of materials

[0044] a. Steel needle: The length of the steel needle is ensured to be able to pass through the umbrella part of the jellyfish.

[0045] b. Fishing line: The diameter of the fishing line is such that, according to the size and type of the jellyfish, the pressure exerted by the fishing line on the jellyfish will not cause the jellyfish to rupture.

[0046] c. Steel pipe 9: The length of the steel pipe 9 is less than the diameter of the jellyfish.

[0047] d. Net cage 1, pulley 3, counterweight 8;

[0048] Among them, the parameters of the fishing line, steel pipe 9, pulley 3, and counterweight 8 can be determined according to the situation of the net cage 1 and the size of the jellyfish.

[0049] Step 2: Assembly

[0050] Prepare two equal-length fishing lines as the connecting line 2. Install a steel needle at one end of the connecting line 2, pass it through both sides of the jellyfish umbrella part, then remove the steel needle, and tie the two ends of the connecting line 2 to the two steel pipes 9 respectively.

[0051] Prepare four fishing lines of equal length as two groups of first towing ropes 4 and second towing ropes 5. The first towing ropes 4 and the second towing ropes 5 are wound around the surface of the pulley 3. The bottom ends of the first towing ropes 4 and the second towing ropes 5 are respectively fixedly connected to both ends of the steel pipe 9, so that the two steel pipes 9 are suspended in the net cage 1;

[0052] Prepare two fishing lines of equal length as suspension lines 6. The suspension lines 6 are tied to the center of gravity of the steel pipe 9. The top end of the suspension line 6 is fixedly connected to the cantilever rod 7, and the counterweight 8 is fixed to the bottom end of the suspension line 6;

[0053] Step 3: Adjustment of the attitude angle

[0054] The line connecting the centers of gravity of the two steel pipes 9 is used as the rotation axis. Pull the first towing rope 4 and release the second towing rope 5. The two steel pipes 9 rotate clockwise around the rotation axis. Or, release the first towing rope 4 and tighten the second towing rope 5. The two steel pipes 9 rotate counterclockwise around the rotation axis;

[0055] Step 4: On the upper side of the net cage 1, use an EK80 fish finder to measure the target strength of jellyfish at different attitude angles.

[0056] Among them, for the specific method of measuring the target strength of jellyfish by the fish finder, refer to the following reference documents, which will not be elaborated here. Reference documents: Chen Sheng, Ji Jianda, Yu Tao, etc. Measurement and analysis of the target strength of Aurelia aurita under different frequency conditions [J]. Digital Ocean and Underwater Defense, 2023, 6(01): 72-80. DOI: 10.19838 / j.issn.2096-5753.2023.01.009.

[0057] During the experiment process, assemble according to the above method. As Figure 1 shown, immerse the net cage 1 in the seawater experimental pool. In step 2, when the suspension line 6 is tied to the center of gravity of the steel pipe 9, adjust the distance between the steel pipe 9 and the cantilever rod 7 so that the distances between the two steel pipes 9 and the two cantilever rods 7 directly above are equal. The plane formed by the two steel pipes 9 is parallel to the horizontal plane (it should be noted that the jellyfish is initially in a horizontal posture). The line connecting the centers of gravity of the two steel pipes 9 is used as the rotation axis. Pull the first towing rope 4 and release the second towing rope 5. The two steel pipes 9 rotate clockwise around the rotation axis. As Figure 3 shown, on the contrary, the two steel pipes 9 rotate counterclockwise around the rotation axis. At this time, the jellyfish flips. The fish finder is on the upper side of the net cage 1 to measure the target strength of the jellyfish at different attitude angles;

[0058] Or, make the distances between the two steel pipes 9 and the two cantilever rods 7 directly above not equal. The plane formed by the two steel pipes 9 forms a certain angle with the horizontal plane (it should be noted that the jellyfish is initially in an inclined posture, refer to Figure 4) In step 4, an EK80 fish finder is additionally installed on the side of the net cage 1 in the longitudinal direction of the steel pipe 9, and the operation is carried out according to step 3 to measure the target strength of jellyfish at different attitude angles.

[0059] The steel pipe 9 is suspended by the suspension wire 6. By adjusting the suspension height of the two sides of the suspension wire 6 for the steel pipe 9, the plane formed by the two steel pipes 9 can be adjusted horizontally or obliquely. When the first towing rope 4 or the second towing rope 5 is tightened, the jellyfish is flipped in a horizontal or inclined attitude, so that the fish finder can measure more target strength data at different attitude angles on the upper side or side of the net cage 1, making the established target strength model more comprehensive and meeting the application requirements of static horizontal observation and underway vertical observation.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An underwater device for observing the target intensity of large jellyfish at different attitude angles, comprising a cage (1), wherein a constraint component and an attitude adjustment component are arranged in the cage (1), characterized in that: The restraint assembly comprises a bracket and connecting wires (2), wherein the two connecting wires (2) pass through the umbrella of the jellyfish, and the ends of the two connecting wires (2) are fixedly connected to the bracket; The posture adjustment component comprises a pulley (3), a first traction rope (4) and a second traction rope (5); the pulley (3) is rotatably mounted on the upper side of the net box (1); the first traction rope (4) and the second traction rope (5) are wound around the surface of the pulley (3); and the bottom ends of the first traction rope (4) and the second traction rope (5) are respectively fixedly connected to the two sides of the bracket.

2. The device and method for underwater observation of target intensity of large jellyfish at different attitude angles according to claim 1, characterized in that: The support comprises two steel pipes (9) of equal length, the two steel pipes (9) are arranged in parallel, two connecting wires (2) are arranged in parallel, and the two ends of the two connecting wires (2) are respectively fixedly connected to the two steel pipes (9).

3. The device for underwater observation of target intensity of large jellyfish at different attitude angles according to claim 2, characterized in that: A suspension wire (6) is fixedly installed at the center of gravity of the two steel pipes (9), and two cantilever rods (7) of equal height are fixedly installed on the inner wall of the net box (1). The top end of the suspension wire (6) is fixedly connected to the cantilever rod (7), and the bottom end of the suspension wire (6) is fixedly connected to a counterweight block (8).

4. The device for underwater observation of target intensity of large jellyfish at different attitude angles according to claim 3, characterized in that: The connecting line (2), the first traction rope (4), the second traction rope (5) and the suspension line (6) are all fishing lines.

5. The device for underwater observation of target intensity of large jellyfish at different attitude angles according to claim 4, characterized in that: The bottom ends of the first traction rope (4) and the second traction rope (5) are respectively fixedly connected to the two ends of the steel pipe (9), and there are two groups of posture adjustment components, through which the two steel pipes (9) are suspended in the net box (1).

6. A method for underwater observation of target intensity of large jellyfish at different attitude angles, characterized in that: The specific steps include: Step 1: Preparation of materials a) Steel needle: The length of the steel needle should be enough to pass through the umbrella of the jellyfish; b) Fishing line: The diameter of the fishing line should be sized according to the size and type of the jellyfish so that the pressure exerted by the fishing line on the jellyfish does not cause the jellyfish to burst; c) Steel pipe (9): The length of the steel pipe (9) is smaller than the diameter of the jellyfish; d), net cage (1), pulley (3), counterweight (8); Step 2: Assembly Prepare two fishing lines of equal length as connecting lines (2), install a steel needle at one end of the connecting line (2), pass through the two sides of the jellyfish umbrella, then remove the steel needle, and tie the two ends of the connecting line (2) to the two steel pipes (9) respectively; Four fishing lines of equal length are prepared as two sets of first traction ropes (4) and second traction ropes (5). The first traction ropes (4) and the second traction ropes (5) are wound around the surface of the pulley (3). The bottom ends of the first traction ropes (4) and the second traction ropes (5) are respectively fixedly connected to the two ends of the steel pipe (9), so that the two steel pipes (9) are suspended in the net box (1); Two fishing lines of equal length are prepared as suspension lines (6), the suspension lines (6) are tied to the center of gravity of the steel pipe (9), the top of the suspension lines (6) is fixedly connected to the cantilever rod (7), and the counterweight block (8) is fixed to the bottom of the suspension lines (6); Step 3: Adjustment of attitude angle The center of gravity of the two steel pipes (9) is a rotation axis. When the first traction rope (4) is pulled and the second traction rope (5) is loosened, the two steel pipes (9) rotate clockwise around the rotation axis as the axis. Alternatively, when the first traction rope (4) is loosened and the second traction rope (5) is tightened, the two steel pipes (9) rotate counterclockwise around the rotation axis as the axis. Step 4: On the upper side of the cage (1), use an EK80 fish finder to measure the target intensity of the jellyfish at different posture angles.

7. The method for underwater observation of target intensity of large jellyfish at different attitude angles according to claim 6, characterized in that: In the step 2, when the suspension wire (6) is tied to the center of gravity of the steel pipe (9), the distance between the steel pipe (9) and the cantilever rod (7) is adjusted so that the distances between the two steel pipes (9) and the two cantilever rods (7) directly above are equal, and the plane formed by the two steel pipes (9) is parallel to the horizontal plane, or the distances between the two steel pipes (9) and the two cantilever rods (7) directly above are unequal, and the plane formed by the two steel pipes (9) forms a certain angle with the horizontal plane.

8. The method for underwater observation of target intensity of large jellyfish at different attitude angles according to claim 7, characterized in that: In the step 4, an EK80 fish finder is added to the side of the cage (1) in the length direction of the steel pipe (9) to measure the target intensity of the jellyfish at different posture angles.

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