Design method of aquaculture upwelling generating device and upwelling generating device

Abstract

The application belongs to the technical field of artificial upwelling generating device, and proposes a water product breeding upwelling generating device design method and upwelling generating device. The setting of the circular pipe in the breeding area comprises: one end of the circular pipe is fixed through a floating ball and a cable connected between the floating ball and the circular pipe; the other end of the circular pipe is fixed through a fixing device fixed to the seabed and a cable connected between the fixing device and the circular pipe; and the circular pipe is obliquely arranged in seawater at a designed circular pipe inclination. The device has simple structure, low manufacturing and operation cost, and the circular pipe obliquely arranged in seawater can realize the purpose of upwelling of the lower layer seawater under the action of the flow rate of the lower layer seawater, without other power devices, and can be accepted by water product breeders and achieve good effect. Meanwhile, the circular pipe inclination is determined according to the flow rate of the lower layer seawater, the distance from the bottom end face of the circular pipe to the seabed and the length of the circular pipe, so that the upwelling effect of the lower layer seawater can be optimized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of artificial upwelling device design, in particular to a water product cultivation upwelling device design method and an upwelling device. BACKGROUND

[0002] Water product cultivation belongs to low-carbon cultivation. For example, when cultivating kelp, the kelp absorbs carbon dioxide in seawater through photosynthesis. However, years of continuous water product cultivation have caused the upper water body in the water product cultivation area to be nutrient-poor, affecting the normal growth of water product cultivation products, and even leading to the disease of water product cultivation products. In order to enable the water product cultivation industry to develop continuously, it is urgently needed to solve the problem of nutrient salt deficiency in the upper water body in the water product cultivation area through an artificial upwelling device.

[0003] The inventor finds that the traditional artificial upwelling device has a relatively complex structure, a relatively high manufacturing and operation cost, and undoubtedly significantly increases the production and operation cost for water product cultivators or cultivation enterprises, especially for water product cultivation scattered households with limited funds, thereby limiting the development of the water product cultivation industry and the application of the artificial upwelling device. SUMMARY

[0004] In order to solve the above problems, the present application provides a water product cultivation upwelling device design method and an upwelling device, which has a simple structure, a low manufacturing and operation cost, and can realize the purpose of upwelling of lower seawater under the action of the flow rate of the lower seawater without the need for other power devices. Meanwhile, the inclination of the circular pipe is determined according to the flow rate of the lower seawater, the distance from the bottom end face of the circular pipe to the seabed, and the length of the circular pipe, so that the upwelling effect of the lower seawater can be optimized.

[0005] In order to achieve the above purpose, in a first aspect, the present application provides a water product cultivation upwelling device design method, which adopts the following technical scheme:

[0006] A water product cultivation upwelling device design method, which comprises the setting of a circular pipe in a cultivation area and the design of the inclination of the circular pipe.

[0007] The setting of the circular pipe in the cultivation area comprises that one end of the circular pipe is fixed through a floating ball floating on the seawater surface of the cultivation area and a cable connected between the floating ball and the circular pipe; the other end of the circular pipe is fixed through a fixing device fixed to the seabed and a cable connected between the fixing device and the circular pipe; and the circular pipe is set in seawater with the designed inclination of the circular pipe.

[0008] The design of the inclination of the circular tube includes: the inclination of the circular tube is the angle between the axis of the circular tube and the horizontal plane; the inclination of the circular tube is determined based on the bottom seawater flow velocity, the distance from the bottom end of the circular tube to the seabed, and the length of the circular tube.

[0009] Furthermore, the cable runs through the entire circular tube, and its two ends are connected to the float and the fixing device, respectively.

[0010] Furthermore, multiple fixed supports are provided inside the circular tube, and the cable passes through and fixes the center position of the fixed supports.

[0011] Furthermore, the fixing bracket includes a fixing hole for the cable to pass through; a plurality of fixing rods are arranged circumferentially outside the fixing hole for connecting the fixing hole to the inner wall of the circular tube.

[0012] Furthermore, the total length L of the cable is determined based on the seawater depth and the horizontal distance from the buoy to the fixing device:

[0013]

[0014] Where D is the water depth; H is the horizontal distance from the buoy to the fixed device.

[0015] Furthermore, the bottom opening of the circular tube is configured as a trumpet shape.

[0016] Furthermore, determining the length of the circular tube includes:

[0017] Establish a plane coordinate system with the origin located directly below the location of the fixed device on the seabed. The vertical distance between the origin and the fixed device is 'a'. The projection line of the line connecting the fixed device and the buoy onto a plane passing through the origin and parallel to the seabed is used as the horizontal axis, with the positive direction pointing towards the buoy. The vertical upward direction is used as the positive direction of the vertical axis.

[0018] Calculate the vertical distance 'a' between the origin of the coordinate system and the fixed device. The formula is L = asinh(H / a), where H is the horizontal distance from the float to the fixed device and L is the total length of the cable.

[0019] Calculate the horizontal distance H between the center of the opening at the bottom of the circular tube and the fixing device. b The calculation formula is a+D b =acosh(H b / a), D b This is the distance from the center of the opening at the bottom of the circular tube to the seabed.

[0020] Calculate the horizontal distance H between the center of the opening at the upper end of the circular tube and the fixing device. t The formula is a + DD t =acosh(Ht / a), D t is the distance between the open upper end of the circular pipe and the sea surface.

[0021] The length of the circular pipe S = asinh(H t / a) - asinh(H b / a).

[0022] Further, according to the designed inclination of the circular pipe, a cable is arranged at each end of the raft frame rope through a floating ball and a fixing device, and each cable is provided with the circular pipe.

[0023] In order to achieve the above-mentioned purpose, in a second aspect, the application further provides an aquaculture upwelling generating device, which adopts the following technical scheme:

[0024] An aquaculture upwelling generating device is obtained by the design method of the aquaculture upwelling generating device as described in the first aspect.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] In the application, the circular pipe is arranged in the aquaculture area as follows: one end of the circular pipe is fixed through a floating ball floating on the sea surface of the aquaculture area and a cable connected between the floating ball and the circular pipe; the other end of the circular pipe is fixed through a fixing device fixed to the seabed and a cable connected between the fixing device and the circular pipe; and the circular pipe is arranged in the sea water in a designed inclination. The application has the advantages of simple structure, low manufacturing and operation cost, and the circular pipe arranged in the sea water in the inclination can realize the purpose of upwelling of the lower sea water under the action of the flow speed of the lower sea water, without the need of other power devices, and can be accepted by aquaculture farmers and achieve good effects. Meanwhile, the inclination of the circular pipe is determined according to the flow speed of the lower sea water, the distance from the bottom end surface of the circular pipe to the seabed and the length of the circular pipe, so that the upwelling effect of the lower sea water can be optimized. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings constituting a part of this embodiment are used to provide further understanding of this embodiment, and the schematic embodiment and its description are used to explain this embodiment, and do not constitute improper limitation on this embodiment.

[0028] Figure 1 FIG. 1 is a structural schematic diagram of the designed device of embodiment 1 of the application;

[0029] Figure 2 FIG. 2 is a schematic diagram of the fixing support of embodiment 1 of the application;

[0030] Figure 3 FIG. 3 is a schematic diagram of the use state of the device of embodiment 1 of the application;

[0031] Figure 4 Process parameter schematic diagram for determining the length of the circular pipe of embodiment 1 of the present application;

[0032] Wherein, 1, floating ball; 2, cable; 3, upper opening of the circular pipe; 4, circular pipe; 5, fixed support; 51, fixed hole; 53, fixed rod; 6, lower opening of the circular pipe; 7, fixing device; 8, raft rope; 9, aquaculture products. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0035] Embodiment 1:

[0036] Traditional artificial upwelling flow generating devices have relatively complex structures and relatively high manufacturing and operation costs. For aquaculture farmers or enterprises, especially for limited funds, the use of traditional artificial upwelling flow generating devices will undoubtedly significantly increase the production and operation costs, thereby limiting the development of the aquaculture industry and the application of artificial upwelling flow generating devices. In view of the above problems, as shown in Figure 1 The present embodiment provides a design method of an aquaculture upwelling flow generating device, which includes the setting of a circular pipe 4 in an aquaculture area and the design of the inclination of the circular pipe 4.

[0037] The setting of the circular pipe 4 in the aquaculture area includes: one end of the circular pipe 4 is fixed by a floating ball 1 floating on the surface of the seawater in the aquaculture area and a cable 2 connected between the floating ball 1 and the circular pipe 4; the other end of the circular pipe 4 is fixed by a fixing device 7 fixed to the seabed and a cable 2 connected between the fixing device 7 and the circular pipe 4; the circular pipe 4 is set in the seawater with a designed inclination of the circular pipe; the fixing device 7 can be a sinkstone or an anchor, etc.

[0038] The design of the inclination of the circular pipe includes: the inclination of the circular pipe is the included angle between the axis of the circular pipe and the horizontal plane; the inclination of the circular pipe is determined according to the bottom seawater flow rate, the distance from the bottom end face of the circular pipe to the seabed and the length of the circular pipe.

[0039] Specifically, the upwelling flow generating device obtained by the design method of the embodiment has simple structure, low manufacturing and operation cost, and the inclined circular pipe 4 arranged in seawater can realize the purpose of upwelling of lower seawater under the action of the flow speed of the lower seawater, without other power devices, and can be accepted by aquaculture farmers and achieve good results. At the same time, the inclination of the circular pipe is determined according to the flow speed of the lower seawater, the distance from the bottom end face of the circular pipe to the seabed, and the length of the circular pipe, so that the upwelling effect of the lower seawater can be optimized.

[0040] Optionally, in the embodiment, as shown in Figure 1 and Figure 2 , the cable 2 penetrates the entire circular pipe 4, and the two ends of the cable 2 are connected with the floating ball 1 and the fixing device 7 respectively. A plurality of fixing supports 7 are arranged in the circular pipe 4, and the cable 2 penetrates and fixes the center position of the fixing support 5.

[0041] Optionally, the fixing support 5 includes a fixing hole 51 for penetrating the cable 2, and a plurality of fixing rods 52 are arranged on the circumference outside the fixing hole 51 for connecting the fixing hole 51 and the inner wall of the circular pipe 4.

[0042] In the embodiment, the inclination of the circular pipe is:

[0043] θ=-αT+βV

[0044] Wherein, θ is the inclination of the circular pipe; T is the distance from the bottom end face of the circular pipe to the seabed, which can be measured; V is the flow speed of the lower seawater, which can be measured; α and β are coefficients, which can be determined by experience, experiment or historical data, for example, through a large amount of historical data, under the condition that θ is known, the least square method and other methods are used to obtain.

[0045] Further, in order to better determine the inclination of the circular pipe, the length of the circular pipe is considered, and the inclination of the circular pipe is determined according to the flow speed of the lower seawater, the distance from the bottom end face of the circular pipe to the seabed and the length of the circular pipe. At this time, the inclination of the circular pipe is:

[0046] θ=-αT+βV+γS

[0047] Wherein, S is the length of the circular pipe; γ is a coefficient, and similarly, the coefficients α, β and γ can be determined by experience, experiment or historical data, for example, through a large amount of historical data, under the condition that θ is known, the least square method and other methods are used to obtain.

[0048] In the embodiment, the cable is arranged according to the same catenary parameters as the center line of the circular pipe, according to the water depth D and the horizontal distance H between the floating ball and the fixing device, and the length L of the cable is determined according to the formula:

[0049]

[0050] wherein the distance D from the center of the circular pipe water inlet to the seabed is determined according to the average thickness δ of the seabed boundary layer observed by the flow velocity profiler b , D b = δ; the distance D from the circular pipe water outlet to the sea surface is determined according to the length of the kelp and the water depth t , D t = 0-4m, and when the water depth is shallow, the circular pipe water outlet can be arranged on the sea surface.

[0051] As shown in Figure 4 , the length determination method of the circular pipe comprises the following steps:

[0052] S1, a plane coordinate system is determined, the coordinate origin is located directly below the seabed position of the fixed device, the vertical distance between the coordinate origin and the fixed device is a, the projection line on the plane parallel to the seabed with the connecting line between the fixed device and the floating ball passing through the coordinate origin as the horizontal coordinate axis, the positive direction is towards the floating ball side, and the vertical upward direction is the positive direction of the vertical coordinate axis.

[0053] S2, the vertical distance a between the coordinate origin and the fixed device is calculated, and the calculation formula is L = asinh(H / a).

[0054] S3, the horizontal distance H between the center of the circular pipe bottom opening and the fixed device is calculated b , and the calculation formula is a + D b = acosh(H b / a).

[0055] S4, the horizontal distance H between the center of the circular pipe upper opening and the fixed device is calculated t , and the formula is a + D - D t = acosh(H t / a).

[0056] S5, the length S of the circular pipe is calculated, S = asinh(H t / a) - asinh(H b / a).

[0057] In some embodiments, the pipe diameter of the upper opening of the circular pipe is 0.1-0.2 times the flow velocity of the bottom layer seawater; the pipe diameter of the bottom opening of the circular pipe is 1.2-1.7 times the pipe diameter of the upper end of the circular pipe; and the length of the lower end of the circular pipe is 20-40 cm.

[0058] Specifically, the pipe diameter of the upper end of the circular pipe is 0.1-0.2 times the flow velocity of the bottom layer seawater, which is verified by fluid mechanics calculation software to be relatively good. For example, a plurality of values such as 0.1, 0.2, 0.3,..., 0.9 are set, and the results of each value are calculated one by one. In some embodiments, the pipe diameter of the upper end of the circular pipe is preferably in the range of 0.1-0.2 times the flow velocity of the bottom layer seawater. The lower end of the circular pipe is in a trumpet shape, which is mainly to increase the water inflow. If the diameter of the trumpet mouth is too small, the effect cannot be achieved, and if the diameter of the trumpet mouth is too large, the water resistance of the trumpet mouth will be large, which will affect the stability of the overall structure. Therefore, the pipe diameter of the bottom end of the circular pipe is 1.2-1.7 times the pipe diameter of the upper end of the circular pipe, and the length of the trumpet-shaped part at the lower end of the circular pipe is preferably 20-40 cm.

[0059] As shown in Figure 3 some embodiments, according to the designed inclination of the circular pipe, a cable 2 is arranged at each end of the raft rope 8 through a floating ball 1 and a fixing device 7, and the circular pipe 4 is arranged on each cable 2. The raft rope 8 can be provided with seaweed and other aquaculture products 9.

[0060] In some embodiments, the water depth of the aquaculture area is 15 m, the horizontal distance between the fixing device 7 and the floating ball 1 is 15 m, and the total length of the cable 2 is about 22.44 m. The top end of the circular pipe 4 is 3 m away from the sea surface, the center of the lower end opening of the circular pipe is 4 m away from the sea bottom, the pipe diameters of the upper end opening and the lower end opening of the circular pipe are 200 mm and 300 mm, respectively, and the total length of the circular pipe is 9.65 m, of which the length of the trumpet-shaped part at the lower end of the circular pipe is 30 cm. The designed upwelling generator is used as a mooring rope for seaweed raft culture, which not only fixes the seaweed culture raft, but also generates upwelling.

[0061] Embodiment 2

[0062] The present embodiment provides an aquaculture upwelling generator obtained by the design method of the aquaculture upwelling generator as described in Embodiment 1.

[0063] Embodiment 3

[0064] The present embodiment provides an aquaculture upwelling generator, which is different from Embodiment 1 in the design of the inner diameter of the bottom end opening of the circular pipe and the inner diameter of the upper end opening of the circular pipe. Specifically,

[0065] The inner diameter (unit: m) D of the upper end opening of the circular pipe is determined according to the average value v (unit: m / s) of the maximum flow velocity of the water layer where the bottom end opening of the circular pipe is located, which is observed by a flow velocity profiler. out , D out = 0.1-0.2v.

[0066] Inner diameter D of the bottom opening of the round tube in It is 1.2 to 1.7 times the inner diameter of the opening at the upper end of the circular tube, i.e., D. in =1.2~1.7D out The flared section at the bottom opening of the round tube is 20-40cm long;

[0067] like Figure 3 As shown, the buoy in this embodiment is a round buoy commonly used in raft aquaculture, and the artificial upwelling device is fixed with sinkers. Assuming the water depth of the kelp farming area is 15m, the horizontal distance between the sinkers and the buoy in this embodiment is set to 12m, according to the formula... The total length of the cable was calculated to be 20.41 m. Assuming the average thickness of the seabed boundary layer observed by the velocity profiler is δ = 3.5 m, the distance D from the center of the opening at the bottom of the circular pipe to the seabed is... b = 3.5m; the distance between the upper opening of the circular pipe and the sea surface is taken as D. t =3m; Based on the above parameters, the distance a between the sinker and the origin of the coordinate system is calculated to be 6.39m, and the horizontal distance H between the center of the opening at the bottom of the circular pipe and the sinker is calculated to be 3m. b =6.41m, the horizontal distance H between the center of the opening at the upper end of the circular pipe and the sinker. t =10.98m, the length of the circular pipe is 9.70m; assuming the average velocity at the seabed boundary layer observed by the velocity profiler is v = 1m / s, and the inner diameter of the opening at the upper end of the circular pipe is D. out =0.2v=0.2m, meaning the inner diameter of the upper opening of the circular pipe is 200mm; the inner diameter of the lower opening of the circular pipe is taken as 1.25 times the inner diameter of the outlet of the circular pipe, i.e., D. out =250mm, and the length of the flared section at the bottom opening of the round tube is set to 30cm.

[0068] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A design method for an upwelling generation device in aquaculture, characterized in that, This includes the placement of the circular pipes within the aquaculture area, as well as the design of the pipe inclination. The circular tube is installed in the aquaculture area as follows: one end of the circular tube is fixed by a buoy floating on the seawater surface of the aquaculture area and a cable connecting the buoy and the circular tube; the other end of the circular tube is fixed by a fixing device fixed to the seabed and a cable connecting the fixing device and the circular tube; the circular tube is installed in the seawater at a designed inclination. The design of the inclination of the circular tube includes: the inclination of the circular tube is the angle between the axis of the circular tube and the horizontal plane; the inclination of the circular tube is determined based on the bottom seawater flow velocity, the distance from the bottom end of the circular tube to the seabed, and the length of the circular tube; The cable runs through the entire circular tube, and its two ends are connected to the float and the fixing device, respectively. The total length of the cable L The distance is determined based on the seawater depth and the horizontal distance from the buoy to the fixed device: in, D Seawater depth; H The horizontal distance from the float to the fixed device; The determination of the length of the circular tube includes: Establish a planar coordinate system with its origin directly below the location of the fixed device on the seabed. The vertical distance between the origin and the fixed device is... a The horizontal axis is the projection of the line connecting the fixed device and the buoy onto a plane that passes through the origin and is parallel to the seabed, with the positive direction pointing towards the buoy. The vertical upward direction is the positive direction of the vertical axis. Calculate the vertical distance between the coordinate origin and the fixed device. a The calculation formula is: L = a sinh( H / a ), H The horizontal distance from the float to the fixed device. L This refers to the total length of the cable. Calculate the horizontal distance between the center of the opening at the bottom of the circular tube and the fixing device. H b The calculation formula is: a + D b = a cosh( H b / a ), D b This is the distance from the center of the opening at the bottom of the circular tube to the seabed. Calculate the horizontal distance between the center of the opening at the top of the circular tube and the fixing device. H t The formula is a + D - D t = a cosh( H t / a ), D t This is the distance between the opening at the top of the circular tube and the sea surface. Calculate the length of the circular tube S = a sinh( H t / a )- a sinh( H b / a ).

2. The design method of an upwelling device for aquaculture as described in claim 1, characterized in that, Multiple fixed supports are installed inside the circular tube, and the cable passes through and fixes the center position of the fixed supports.

3. The design method of an upwelling device for aquaculture as described in claim 2, characterized in that, The fixing bracket includes a fixing hole for the cable to pass through; a plurality of fixing rods are arranged circumferentially outside the fixing hole for connecting the fixing hole to the inner wall of the round tube.

4. The design method of an upwelling device for aquaculture as described in claim 1, characterized in that, The bottom opening of the circular tube is flared.

5. The design method of an upwelling device for aquaculture as described in claim 1, characterized in that, According to the designed inclination of the circular tube, a cable is set at each end of the raft frame rope through a float and a fixing device, and the circular tube is set on each cable.

6. An upwelling device for aquaculture, characterized in that, This is obtained through the design method of the aquaculture upwelling device as described in any one of claims 1 to 5.

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