Artificial downwelling plume capture method and device, electronic equipment, and storage medium

Abstract

The present invention discloses a method for capturing an artificial downwelling plume, which can be applied in oceans and lakes. Because the density of the artificial downwelling plume is lower than that of the receiving water, the plume may completely escape the hypoxic layer due to buoyancy, rendering the artificial downwelling oxygenation ineffective. The control method of the present invention is simple, reliable, and easy to operate, and can easily determine the optimal height for deploying the downwelling conduit, thereby ensuring that the artificial downwelling plume is completely captured by the hypoxic layer and maximizing the oxygenation efficiency.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering, and in particular to a method and device for capturing an artificial downwelling plume, electronic equipment, and a storage medium. Background Art

[0002] In recent years, due to climate change and human-induced eutrophication of coastal waters, the global ocean has been deoxygenated, posing a significant challenge to human survival. First, persistent ocean hypoxia has significantly disrupted marine biogeochemical cycles, affecting the deposition and mineralization of organic carbon, disrupting the balance of the global carbon cycle, and prompting the ocean to emit greenhouse gases such as methane and nitrous oxide (N2O) into the atmosphere, exacerbating global warming. More critically, hypoxia severely damages biological habitats, increases the concentration of harmful reducing substances in the water, alters the structure of marine food chains, and thus reduces marine biodiversity. As humanity copes with population growth and climate change, ocean hypoxia threatens human food security and biomedical supplies and increases the uncertainty of climate change. Therefore, alleviating ocean hypoxia is essential for the sustainable development of human society.

[0003] Artificial downwelling has been shown to improve marine ecology and alleviate marine hypoxia, making it a new research area for artificial marine systems. Currently, many countries have developed a variety of artificial downwelling aeration devices, including Japan's DCG density flow generator and mechanical water circulation device, Sweden's BOX wind turbine aeration device, and China's tidal pump aeration device. However, a major obstacle to the development of artificial downwelling is the difficulty in ensuring that the plume is captured by the anoxic layer. If the plume escapes the anoxic layer, the oxygenation effect of artificial downwelling is greatly reduced.

[0004] According to literature research, there has been no systematic research on the artificial downwelling plume capture technology to date, and there is a lack of scientific guidance on the placement height of artificial downwelling pipe nozzles. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a method and device for capturing an artificial downwelling plume, an electronic device, and a storage medium to solve the technical problem in the related art that the artificial downwelling plume cannot be captured by the anoxic layer, thereby greatly reducing the oxygenation effect.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, an embodiment of the present invention provides a method for capturing an artificial downwelling plume, comprising:

[0008] Obtain seawater density gradient, bottom seawater density, anoxic layer thickness, downwelling plume discharge velocity, discharge density, and draft tube radius;

[0009] Calculating the initial mass flux, initial momentum flux, initial buoyancy flux and Brent-Vesella frequency of the artificial downwelling according to the density gradient of the seawater, the density of the bottom seawater, the discharge velocity and discharge density of the downwelling plume and the radius of the guide tube;

[0010] calculating an entrainment coefficient according to the initial mass flux of the artificial downwelling, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling, and the Brunt-Vesella frequency;

[0011] Calculating the maximum penetration height of the downwelling plume, the diffusion height of the downwelling plume, and the radial invasion thickness of the plume according to the entrainment coefficient, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling, and the Brunt-Vesella frequency;

[0012] According to the diffusion height of the downwelling plume, the radial invasion thickness of the plume and the thickness of the anoxic layer, the optimal discharge height at which the artificial downwelling plume is captured by the anoxic layer is calculated, so that when the downwelling pipe mouth is set at the optimal discharge height, the artificial downwelling plume is completely discharged into the hypoxic layer and will not float up into the oxygen-rich water layer, thereby maximizing the artificial downwelling oxygenation efficiency.

[0013] Optionally, the calculation formulas for the initial mass flux, initial momentum flux, initial buoyancy flux, and Brent-Vesella frequency are as follows:

[0014]

[0015]

[0016]

[0017]

[0018] Where Q0 is the initial mass flux, M0 is the initial momentum flux, B0 is the initial buoyancy flux, N is the Brunt-Vecella frequency, g is the acceleration due to gravity, dρ / dz is the density gradient of seawater, ρ b is the density of the lowest seawater, w0 is the discharge velocity of the downwelling plume, ρ0 is the discharge density, and r0 is the radius of the draft tube.

[0019] Optionally, the calculation formula of the clamping coefficient is as follows:

[0020]

[0021] In formula (5), α is the clamping coefficient, α p is the asymptotic value of the plume entrainment coefficient, M0 is the initial momentum flux, B0 is the initial buoyancy flux, and N is the Brunt-Visela frequency.

[0022] Optionally, the calculation formulas for the maximum penetration height of the downflow plume, the diffusion height of the downflow plume, and the radial penetration thickness of the plume are as follows:

[0023]

[0024]

[0025] h p =1.36H P σ -0.3 (8)

[0026] Where Z m is the maximum penetration height of the downwelling plume, Z s is the diffusion height of the downwelling plume, h p is the radial intrusion thickness of the plume, α is the entrainment coefficient, B0 is the initial buoyancy flux, N is the Brunt-Visela frequency, Hp is the natural length of the artificial downwelling system scale, which represents the vertical distance that the buoyancy overcomes the initial flow-related inertia, σ is a dimensionless parameter,

[0027] Optionally, the calculation formula for the optimal discharge height at which the artificial downwelling plume is captured by the anoxic layer is as follows:

[0028]

[0029] Where h optimal is the optimal discharge height, h hypoxia is the anoxic layer thickness, α is the entrainment coefficient, M0 is the initial momentum flux, B0 is the initial buoyancy flux, and N is the Brent-Visela frequency.

[0030] In a second aspect, an embodiment of the present invention provides an artificial downwelling plume capture device, comprising:

[0031] An acquisition module is used to obtain the density gradient of seawater, the density of the lowest seawater, the thickness of the anoxic layer, the discharge velocity of the downwelling plume, the discharge density and the radius of the guide tube;

[0032] a first calculation module, configured to calculate an initial mass flux, an initial momentum flux, an initial buoyancy flux, and a Brent-Vesella frequency of the artificial downwelling according to the density gradient of the seawater, the density of the bottom seawater, the discharge velocity and density of the downwelling plume, and the radius of the guide tube;

[0033] a second calculation module, configured to calculate an entrainment coefficient according to the initial mass flux of the artificial downwelling, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling, and the Brent-Vesella frequency;

[0034] a third calculation module, configured to calculate the maximum penetration height of the downflow plume, the diffusion height of the downflow plume, and the radial invasion thickness of the plume according to the entrainment coefficient, the initial momentum flux of the artificial downflow, the initial buoyancy flux of the artificial downflow, and the Brunt-Visela frequency;

[0035] The fourth calculation module is used to calculate the optimal discharge height at which the artificial downwelling plume is captured by the anoxic layer based on the downwelling plume diffusion height, the plume radial invasion thickness and the thickness of the anoxic layer, so that when the downwelling pipe mouth is set at the optimal discharge height, the artificial downwelling plume is completely discharged into the hypoxic layer and will not float up to the oxygen-rich water layer, thereby maximizing the artificial downwelling oxygenation efficiency.

[0036] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0037] one or more processors;

[0038] a memory for storing one or more programs;

[0039] When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in the first aspect.

[0040] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the steps of the method described in the first aspect.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The density gradient of seawater, the density of the bottom seawater, the thickness of the anoxic layer, the discharge velocity of the downwelling plume, the discharge density and the radius of the guide tube are obtained; then, according to the density gradient of seawater, the density of the bottom seawater, the discharge velocity of the downwelling plume, the discharge density and the radius of the guide tube, the initial mass flux, the initial momentum flux, the initial buoyancy flux and the Brent-Visela frequency of the artificial downwelling are calculated; then, according to the initial mass flux of the artificial downwelling, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling and the Brent-Visela frequency, the entrainment coefficient is calculated; according to the entrainment coefficient, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling and the Brent-Visela frequency, the initial mass flux of the artificial downwelling, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling and the Brent-Visela frequency, the initial buoyancy flux of the artificial downwelling The maximum penetration height of the downflow plume, the diffusion height of the downflow plume and the radial invasion thickness of the plume are calculated; finally, the optimal discharge height at which the artificial downflow plume is captured by the anoxic layer is calculated according to the diffusion height of the downflow plume, the radial invasion thickness of the plume and the thickness of the anoxic layer, so that when the downflow pipe mouth is set at the optimal discharge height, the artificial downflow plume is completely discharged into the hypoxic layer and will not float up to the oxygen-rich water layer, thereby maximizing the artificial downflow oxygenation efficiency. The present invention does not require higher device construction cost and energy consumption, thereby achieving the capture of the artificial downflow plume by the hypoxic layer, achieving optimal efficiency, reducing the risk of harmful substances precipitating in the sediment, optimizing device design, and reducing operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] Figure 1 The figure is a flow chart showing a method for capturing an artificial downwelling plume according to an exemplary embodiment.

[0045] Figure 2 FIG. 1 is a schematic diagram showing the morphology of an artificial downwelling plume in a stagnant stratified water body according to an exemplary embodiment.

[0046] Figure 3 It is a block diagram of an artificial downwelling plume capture device according to an exemplary embodiment.

[0047] Figure 4 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0048] The present invention will be described in further detail below with reference to the accompanying drawings.

[0049] To maximize the oxygenation efficiency of artificial downwelling and prevent the oxygen-rich plume from escaping the anoxic layer, the present invention proposes an artificial downwelling plume capture technology. This technology is simple, reliable, easy to operate, and can be applied in both oceans and lakes. Specifically, it includes the following steps:

[0050] Figure 1 FIG. 1 is a flow chart showing a method for capturing an artificial downwelling plume according to an exemplary embodiment. Figure 1 As shown, the method may include the following steps:

[0051] S1: Obtain the density gradient of seawater dρ / dz and the density of the bottom seawater ρ b , thickness of the hypoxic layer h hypoxia , downflow plume discharge velocity w0, discharge density ρ0 and draft tube radius r0;

[0052] The above steps realize the density gradient of seawater dρ / dz and the density of the bottom seawater ρ b , thickness of the hypoxic layer h hypoxia , the acquisition of the downflow plume discharge velocity w0, discharge density ρ0 and guide tube radius r0, and the collection of the minimum parameters required for the design of the optimal discharge height, further reducing the complexity of data collection of the artificial downflow device, improving the upload speed of the collected parameters, and thus improving the running speed of the program.

[0053] S2: According to the density gradient of the seawater dρ / dz and the density of the bottom seawater ρ b , downwelling plume discharge velocity w0, discharge density ρ0 and guide tube radius r0, calculate the initial mass flux Q0, initial momentum flux M0, initial buoyancy flux B0 and Brunt-Vesella frequency N of artificial downwelling;

[0054] Specifically, the calculation formulas for the initial mass flux Q0, initial momentum flux M0, initial buoyancy flux B0, and Brent-Vesella frequency N are as follows:

[0055]

[0056]

[0057]

[0058]

[0059] Where g is the acceleration due to gravity, which is 9.81 m / s 2 .

[0060] The above steps realize the determination of various descriptive parameters of the negative buoyancy jet, and describe the artificial downwelling in engineering applications through mathematical language, further realizing the transformation from complex physical models to simple mathematical models, thereby improving the calculation speed of the program and the reliability of the algorithm.

[0061] S3: Calculating the value of the entrainment coefficient α according to the initial mass flux Q0 of the artificial downwelling, the initial momentum flux M0 of the artificial downwelling, the initial buoyancy flux B0 of the artificial downwelling, and the Brunt-Vesella frequency N;

[0062] Specifically, the calculation formula of the clamping coefficient α is as follows:

[0063]

[0064] In formula (5), α p As the asymptotic value of the plume entrainment coefficient, we take α p =0.085.

[0065] The above steps achieve the determination of the entrainment coefficient α, further determine the entrainment effect of the artificial downwelling plume on the ambient water body, improve the construction of the mathematical model, enhance the accuracy of the mathematical model, and thus improve the reliability of the algorithm.

[0066] S4: Calculate the maximum penetration height Z of the downwelling plume based on the entrainment coefficient α, the initial momentum flux M0 of the artificial downwelling, the initial buoyancy flux B0 of the artificial downwelling, and the Brunt-Vesella frequency N. m , downwelling plume diffusion height Z s and plume radial penetration thickness h p ;

[0067] Specifically, the maximum penetration height Z of the downwelling plume is m , downwelling plume diffusion height Z s and plume radial penetration thickness h p The calculation formula is as follows:

[0068]

[0069]

[0070] h p =1.36H P σ -0.3 (8)

[0071] In formula (8), Hp is the natural length of the artificial downwelling system scale, which represents the vertical distance that the buoyancy overcomes the inertia associated with the initial flow. σ is a dimensionless parameter,

[0072] The above steps realize the determination of the maximum penetration height of the downwell plume, the diffusion height of the downwell plume, and the radial invasion thickness of the plume, and establish an artificial downwell plume morphology model through these three factors, further reducing the complexity of the program's understanding of the plume hydrodynamics and thereby improving the program's calculation speed.

[0073] S5: According to the diffusion height Z of the downwelling plume s , plume radial penetration thickness h p and the thickness of the anoxic layer h hypoxia , calculate the optimal discharge height h for the artificial downwelling plume to be captured by the anoxic layer optimal , so that when the downflow nozzle is set at the optimal discharge height h optimal At this time, the artificial downwelling plume is completely discharged into the low-oxygen layer and will not float up to the oxygen-rich water layer, maximizing the oxygenation efficiency of the artificial downwelling.

[0074] Specifically, the optimal discharge height h for the artificial downwelling plume to be captured by the anoxic layer is optimal The calculation formula is as follows:

[0075]

[0076] Set the downflow pipe orifice at the optimal discharge height h optimal At this time, the artificial downwelling plume is completely discharged into the low-oxygen layer and will not float up to the oxygen-rich water layer, maximizing the oxygenation efficiency of the artificial downwelling.

[0077] The above steps achieve the determination of the optimal discharge height, so that the artificial downwelling plume can be captured by the low-oxygen layer, reducing the construction cost and energy consumption of the device, improving the oxygenation efficiency, and reducing the risk of precipitation of harmful substances in the sediment, thereby optimizing the device design and reducing operation and maintenance costs.

[0078] When the discharge height is greater than h optimal When the artificial downwelling plume partially or completely escapes from the hypoxia, the oxygenation efficiency is reduced or even completely ineffective; the discharge height is less than h optimal When the plume is discharged at a low height, the artificial downwelling equipment needs to consume more energy to discharge the plume into deeper water bodies; when the plume discharge height is too small, the plume will impact the seabed sediments, releasing harmful chemicals in the sediments, causing secondary pollution of the bottom water bodies; therefore, placing the artificial downwelling diversion pipe mouth at an ideal height can ensure the minimum energy consumption when maximizing the oxygenation efficiency of the artificial downwelling plume, and avoid the precipitation of harmful substances in the sediments.

[0079] Figure 2 FIG. 1 is a schematic diagram showing an artificial downwelling plume morphology according to an exemplary embodiment. Figure 2 , the artificial downwelling plume eventually diffuses radially at the neutral buoyancy layer height, with the maximum penetration height Zm , downwelling plume diffusion height Z s , plume radial penetration thickness h p The height of the anoxic layer is also determined accordingly. At this time, the mathematical relationship that makes the plume stay completely in the anoxic layer is:

[0080] h optimal ≈h hypoxia +Z s -h p

[0081] Corresponding to the aforementioned embodiment of the artificial downwelling plume capturing method, the present application also provides an embodiment of an artificial downwelling plume capturing device.

[0082] Figure 3 FIG. 1 is a block diagram of an artificial downwelling plume capture device according to an exemplary embodiment. Figure 3 , the device comprises:

[0083] Acquisition module 1 is used to obtain the density gradient of seawater, the density of the bottom seawater, the thickness of the anoxic layer, the discharge velocity of the downwelling plume, the discharge density and the radius of the guide tube;

[0084] A first calculation module 2 is used to calculate the initial mass flux, initial momentum flux, initial buoyancy flux and Brent-Vesella frequency of the artificial downwelling according to the density gradient of the seawater, the density of the lowest seawater, the discharge velocity and discharge density of the downwelling plume and the radius of the guide tube;

[0085] a second calculation module 3, configured to calculate an entrainment coefficient according to the initial mass flux of the artificial downwelling, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling, and the Brent-Vesella frequency;

[0086] a third calculation module 4, configured to calculate the maximum penetration height of the downflow plume, the diffusion height of the downflow plume, and the radial invasion thickness of the plume according to the entrainment coefficient, the initial momentum flux of the artificial downflow, the initial buoyancy flux of the artificial downflow, and the Brunt-Vesella frequency;

[0087] The fourth calculation module 5 is used to calculate the optimal discharge height at which the artificial downwelling plume is captured by the anoxic layer based on the diffusion height of the downwelling plume, the radial invasion thickness of the plume and the thickness of the anoxic layer, so that when the downwelling pipe mouth is set at the optimal discharge height, the artificial downwelling plume is completely discharged into the hypoxic layer and will not float up to the oxygen-rich water layer, thereby maximizing the artificial downwelling oxygenation efficiency.

[0088] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0089] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the partial description of the method embodiments. The device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0090] Accordingly, the present application also provides an electronic device, comprising: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned artificial downwelling plume capture method. Figure 4 As shown in the figure, it is a hardware structure diagram of any device with data processing capability where an artificial downwelling plume capture device provided by an embodiment of the present invention is located. Figure 4 In addition to the processor and memory shown, any device with data processing capabilities in which the apparatus in the embodiment is located may also include other hardware according to the actual functions of the device with data processing capabilities, which will not be described in detail.

[0091] Accordingly, the present application also provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the artificial downwelling plume capture method as described above. The computer-readable storage medium may be an internal storage unit of any device with data processing capabilities as described in any of the aforementioned embodiments, such as a hard disk or memory. The computer-readable storage medium may also be an external storage device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), an SD card, a flash card (Flash Card), etc. equipped on the device. Furthermore, the computer-readable storage medium may also include both an internal storage unit and an external storage device of any device with data processing capabilities. The computer-readable storage medium is used to store the computer program and other programs and data required by any device with data processing capabilities, and may also be used to temporarily store data that has been output or is to be output.

[0092] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0093] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for capturing an artificial downwelling plume, characterized in that: include: Obtain seawater density gradient, bottom seawater density, anoxic layer thickness, downwelling plume discharge velocity, discharge density, and draft tube radius; Calculating the initial mass flux, initial momentum flux, initial buoyancy flux and Brent-Vesella frequency of the artificial downwelling according to the density gradient of the seawater, the density of the bottom seawater, the discharge velocity and discharge density of the downwelling plume and the radius of the guide tube; calculating an entrainment coefficient according to the initial mass flux of the artificial downwelling, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling, and the Brunt-Vesella frequency; Calculating the maximum penetration height of the downwelling plume, the diffusion height of the downwelling plume, and the radial invasion thickness of the plume according to the entrainment coefficient, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling, and the Brunt-Vesella frequency; Calculating an optimal discharge height at which the artificial downwelling plume is captured by the anoxic layer based on the downwelling plume diffusion height, the plume radial invasion thickness, and the anoxic layer thickness, so that when the downwelling pipe nozzle is set at the optimal discharge height, the artificial downwelling plume is completely discharged into the hypoxic layer and does not float up into the oxygen-rich water layer, thereby maximizing the oxygenation efficiency of the artificial downwelling; The calculation formulas for the initial mass flux, initial momentum flux, initial buoyancy flux, and Brent-Vesella frequency are as follows: ； ； (3)； (4)； in, Q 0 is the initial mass flux, M 0 is the initial momentum flux, B 0 is the initial buoyancy flux, N is the Brent-Vecella frequency, g is the acceleration due to gravity, dρ / dz is the density gradient of seawater, ρ b is the density of the bottom seawater, w 0 is the discharge velocity of the downwelling plume, ρ 0 is the emission density, r 0 is the radius of the guide tube; The calculation formula of the clamping coefficient is as follows: （5）； In formula (5), α is the clamping coefficient, α p is the asymptotic value of the plume entrainment coefficient, M 0 is the initial momentum flux, B 0 is the initial buoyancy flux, N is the Brent-Vecella frequency; The calculation formulas for the maximum penetration height of the downflow plume, the diffusion height of the downflow plume, and the radial penetration thickness of the plume are as follows: ； ； h p =1.36H P s -0.3 (8); Where, Z m is the maximum penetration height of the downwelling plume, Z s is the downwelling plume diffusion height, h p is the radial penetration thickness of the plume, α is the clamping coefficient, B 0 is the initial buoyancy flux, N is the Brent-Vecella frequency, Hp The natural length of the artificial downwelling system scale, which represents the vertical distance over which the buoyancy overcomes the inertia associated with the initial flow, ; σ is a dimensionless parameter, σ = ; The calculation formula for the optimal discharge height at which the artificial downwelling plume is captured by the anoxic layer is as follows: ； Where, h optimal is the optimal discharge height, h hypoxia is the thickness of the oxygen-deficient layer, α is the clamping coefficient, M 0 is the initial momentum flux, B 0 is the initial buoyancy flux, N is the Brent-Vecella frequency.

2. An artificial downwelling plume capture device, characterized in that: The device is used to implement the artificial downwelling plume capture method according to claim 1, comprising: An acquisition module is used to obtain the density gradient of seawater, the density of the lowest seawater, the thickness of the anoxic layer, the discharge velocity of the downwelling plume, the discharge density and the radius of the guide tube; a first calculation module, configured to calculate an initial mass flux, an initial momentum flux, an initial buoyancy flux, and a Brent-Vesella frequency of the artificial downwelling according to the density gradient of the seawater, the density of the bottom seawater, the discharge velocity and density of the downwelling plume, and the radius of the guide tube; a second calculation module, configured to calculate an entrainment coefficient according to the initial mass flux of the artificial downwelling, the initial momentum flux of the artificial downwelling, the initial buoyancy flux of the artificial downwelling, and the Brent-Vesella frequency; a third calculation module, configured to calculate the maximum penetration height of the downflow plume, the diffusion height of the downflow plume, and the radial invasion thickness of the plume according to the entrainment coefficient, the initial momentum flux of the artificial downflow, the initial buoyancy flux of the artificial downflow, and the Brunt-Visela frequency; The fourth calculation module is used to calculate the optimal discharge height at which the artificial downwelling plume is captured by the anoxic layer based on the downwelling plume diffusion height, the plume radial invasion thickness and the thickness of the anoxic layer, so that when the downwelling pipe mouth is set at the optimal discharge height, the artificial downwelling plume is completely discharged into the hypoxic layer and will not float up to the oxygen-rich water layer, thereby maximizing the artificial downwelling oxygenation efficiency.

3. An electronic device, characterized in that: include: one or more processors; a memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the method according to claim 1 .

4. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the instruction is executed by a processor, the steps of the method according to claim 1 are implemented.

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