Method and device for calculating tidal current velocity range with high efficiency of artificial upwelling

Abstract

The application discloses a kind of artificial upwelling high-efficiency tidal current velocity range transport calculation method and device, comprising: according to injection depth, injection depth corresponding injection amount, seawater density gradient, the diameter of injection nozzle, the environmental water density at injection nozzle position, the density of injected gas is, bubble slip velocity, plume target height, plume effective range and plume efficiency standard, calculate initial buoyancy flux, buoyancy frequency;Calculate critical horizontal cross-flow velocity;When horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity, calculate the range of artificial upwelling high-efficiency tidal current velocity;When horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity, calculate the range of artificial upwelling high-efficiency tidal current velocity;Calculate artificial upwelling high-efficiency tidal current velocity range.It can make artificial upwelling system run when artificial upwelling plume can be efficiently transported to target position, realize artificial upwelling system efficiency maximization.

Description

Technical Field

[0001] The present application relates to the field of marine engineering and marine ecological technology, and in particular to a method and device for calculating the flow velocity range of artificial upwelling with high efficiency. Background Art

[0002] Currently, one of the most efficient methods of artificial upwelling is the pneumatic lift system. This system uses gas injection to elevate nutrient-rich water from the lower layer to the upper water column, stimulating primary productivity in the surface water and providing nutrients for other organisms. Due to tidal currents, the plume formed by the upwelling may not be fully transported to the target surface elevation at certain tidal velocities. However, since the energy supply system for artificial upwelling is often limited, operating the gas injection system at any given time would result in inefficient energy utilization.

[0003] The existing method for calculating the efficient tidal velocity range of artificial upwelling only considers the maximum upwelling height, but does not consider the influence of plume thickness and plume half-width on the transport efficiency of the artificial upwelling plume. The artificial upwelling transport tidal velocity range calculated in this way is not the efficient tidal velocity range. Moreover, the existing calculation theory of the efficient tidal velocity range of artificial upwelling is only for uniform water environment and high-level cross-flow velocity state, while most water environments in ocean and lake environments are density stratified. Therefore, the existing method for calculating the efficient tidal velocity range of artificial upwelling has great limitations and lacks perfect theoretical guidance. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a method and device for calculating the tidal flow velocity of an artificial upwelling with high efficiency, so as to solve the technical problem that the method for calculating the range of high efficiency tidal flow velocity of an artificial upwelling in the related art does not consider the influence of plume thickness and plume half-width on the transport efficiency of the artificial upwelling plume, and has great limitations, resulting in the range of artificial upwelling tidal flow velocity calculated by the calculation method being not the range of high efficiency tidal flow velocity.

[0005] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, an embodiment of the present application provides a method for calculating the flow velocity range of an artificial upwelling high-efficiency tidal current, comprising:

[0007] Obtain the injection depth, the injection volume corresponding to the injection depth, the density gradient of seawater, the diameter of the injection nozzle, the ambient water density at the injection nozzle location, the density of the injected gas, the bubble slip velocity, the target height of the plume, the effective range of the plume, and the efficiency standard of the plume;

[0008] Calculating the initial buoyancy flux and the buoyancy frequency according to the gas injection volume, the ambient water density at the gas injection nozzle location, the density of the injected gas, and the density gradient of the seawater;

[0009] Calculating a critical horizontal cross-flow velocity based on the initial buoyancy flux, the buoyancy frequency, and the bubble slip velocity;

[0010] Calculating a range of tidal flow velocities for high-efficiency artificial upwelling when the horizontal crossflow velocity is less than the critical horizontal crossflow velocity based on the critical horizontal crossflow velocity, the initial buoyancy flux, the buoyancy frequency, the bubble slip velocity, the target height of the plume, and the effective range;

[0011] Calculate the range of tidal flow velocity for high-efficiency transport of artificial upwelling when the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the gas injection depth, the gas injection volume corresponding to the gas injection depth, the bubble slip velocity, the diameter of the gas injection nozzle, the target height and effective range of the plume, the ambient water density, and the density of the injected gas;

[0012] The range of the artificial upwelling high-efficiency tidal flow velocity is calculated according to the range of the artificial upwelling high-efficiency tidal flow velocity and the range of the artificial upwelling high-efficiency tidal flow velocity.

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

[0014]

[0015]

[0016] Where B0 is the initial momentum flux, N is the buoyancy frequency, ρ a is the ambient water density at the injection nozzle location, ρ air is the density of injected gas, g is the acceleration due to gravity, and dρ / dz is the density gradient of seawater.

[0017] Optionally, the critical horizontal cross flow velocity is calculated as follows:

[0018]

[0019] Among them, u ∞e is the critical horizontal cross-flow velocity, u s is the bubble slip velocity.

[0020] Optionally, the range of the artificial upwelling high-efficiency tidal flow velocity is calculated based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the bubble slip velocity, the target height of the plume, and the effective range, when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity, including:

[0021] The height and thickness of the artificial upwelling plume are calculated based on the bubble slip velocity, initial buoyancy flux, and buoyancy frequency:

[0022]

[0023] L=1.02B0 1 / 4 N -3 / 4 (5 Among them, h T is the height of the artificial upwelling plume, L is the thickness of the artificial upwelling plume;

[0024] The transport efficiency of the artificial upwelling plume is calculated based on the height, thickness, target height, and effective range of the artificial upwelling plume:

[0025]

[0026] Where η is the transport efficiency of the artificial upwelling plume, Z AVG is the target height of the plume, L E is the effective range of the plume;

[0027] According to the transport efficiency and efficiency standard of the artificial upwelling plume, the range of the tidal flow velocity of the artificial upwelling with high efficiency is calculated when the calculated horizontal cross flow velocity is less than the critical horizontal cross flow velocity:

[0028]

[0029] Among them, U ∞1 is the range of tidal flow velocity with high efficiency of artificial upwelling when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity, η E For efficiency standards.

[0030] Optionally, the range of the artificial upwelling high-efficiency tidal flow velocity when the horizontal cross flow velocity is greater than the critical horizontal cross flow velocity is calculated based on the critical horizontal cross flow velocity, the initial buoyancy flux, the buoyancy frequency, the gas injection depth, the gas injection volume corresponding to the gas injection depth, the bubble slip velocity, the diameter of the gas injection nozzle, the target height and effective range of the plume, the ambient water density, and the density of the injected gas, including:

[0031] The range of tidal flow velocity with high efficiency of artificial upwelling is calculated by iterative method. The number of iterations is n, starting from 1. At the end of each cycle, n=n+1. The horizontal cross-flow velocity is updated as u in each iteration process. ∞ =u ∞e +0.01n; Calculate the artificial upwelling plume separation height and plume half-width at the separation position based on the initial buoyancy flux, bubble slip velocity, horizontal crossflow velocity, gas injection depth, and gas injection volume corresponding to the gas injection depth:

[0032]

[0033] Among them, z d is the artificial upwelling plume separation height, r d is the plume half-width at the artificial upwelling plume separation position, u s is the bubble slip velocity, B0 is the initial momentum flux, N is the buoyancy frequency, d0 is the diameter of the injection nozzle, and α is the entrainment coefficient, which is calculated by the following formula:

[0034]

[0035] Among them, h0 is the gas injection depth, Q0 is the gas injection volume corresponding to the gas injection depth;

[0036] The average vertical velocity and density of the plume at the separation point are calculated based on the separation height of the artificial upwelling plume, the half-width of the plume at the separation point, the diameter of the gas injection nozzle, the ambient water density at the gas injection nozzle, the density of the injected gas, the gas injection volume corresponding to the gas injection depth, and the horizontal cross-flow velocity:

[0037]

[0038] Among them, u md is the average vertical velocity of the plume at the separation point, ρ d is the density of the plume at the separation point, ρ a is the ambient water density at the injection nozzle location, ρ air is the density of the injected gas, u ∞ is the horizontal cross-flow velocity, u0 is the initial velocity of the plume, and the calculation method is as follows:

[0039]

[0040] The jet momentum and buoyancy flux at the separation point are calculated based on the plume half-width at the separation point, the average vertical velocity and density of the plume at the separation point, and the ambient water density at the injection nozzle position:

[0041] M d =πu md 2 r d 2 (14)

[0042]

[0043] Among them, M d is the jet momentum at the separation point, F d is the jet buoyancy flux at the separation point;

[0044] According to the jet momentum, buoyancy flux and plume half-width at the separation point, the maximum rise height of the plume and the plume half-width at the maximum rise height are calculated:

[0045]

[0046]

[0047] Where b is the half-width of the plume at the maximum rise height, z m is the maximum rise height of the plume, β is the jet diffusion coefficient;

[0048] According to the maximum rise height of the plume and the half-width of the plume at the maximum rise height, the transport efficiency of the artificial upwelling plume under the horizontal crossflow velocity of the current iteration step is calculated:

[0049]

[0050] Among them, η n is the transport efficiency of the artificial upwelling plume at the current horizontal crossflow velocity, Z AVG is the target height of the plume, L E is the effective range of the plume;

[0051] According to the artificial upwelling plume transport efficiency η n , efficiency standard η E , record the first time η is reached during the iteration n >η E When n=n1 and iterates continuously, the first time η is reached n <η E When n=n2 and n1<n2, the range of tidal flow velocity for high-efficiency artificial upwelling transport is calculated when the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity:

[0052] U ∞2 =(u ∞e +n1,u ∞e +n2) (19)

[0053] Among them, u ∞e is the critical horizontal cross-flow velocity, U ∞2 It is the range of tidal flow velocity within which artificial upwelling can efficiently transport tidal flow when the horizontal cross flow velocity is greater than the critical horizontal cross flow velocity.

[0054] Optional, artificial upwelling high efficiency tidal flow velocity range is:

[0055] U ∞ =U ∞1 ∪U ∞2 (20)

[0056] Among them, U ∞ The range of tidal flow velocity for artificial upwelling with high efficiency is U ∞1 It is the range of tidal flow velocity within which artificial upwelling can efficiently transport tidal currents when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity.

[0057] In a second aspect, an embodiment of the present application provides a device for calculating the flow velocity range of an artificial upwelling high-efficiency tidal current, comprising:

[0058] An acquisition module is used to obtain the gas injection depth, the gas injection volume corresponding to the gas injection depth, the density gradient of seawater, the diameter of the gas injection nozzle, the ambient water density at the location of the gas injection nozzle, the density of the injected gas, the bubble slip velocity, the target height of the plume, the effective range of the plume, and the efficiency standard of the plume;

[0059] a first calculation module, configured to calculate an initial buoyancy flux and a buoyancy frequency according to the gas injection volume, the ambient water density at the gas injection nozzle location, the density of the injected gas, and the density gradient of the seawater;

[0060] a second calculation module, configured to calculate a critical horizontal cross-flow velocity based on the initial buoyancy flux, the buoyancy frequency, and the bubble slip velocity;

[0061] a third calculation module for calculating a range of tidal flow velocities for high-efficiency transport of artificial upwelling when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the bubble slip velocity, the target height of the plume, and the effective range;

[0062] a fourth calculation module for calculating a range of tidal flow velocities for high-efficiency transport of artificial upwelling when the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity, based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the gas injection depth, the gas injection volume corresponding to the gas injection depth, the bubble slip velocity, the diameter of the gas injection nozzle, the target height and effective range of the plume, the ambient water density, and the density of the injected gas;

[0063] The fifth calculation module is used to calculate the range of the artificial upwelling high-efficiency tidal flow rate according to the range of the artificial upwelling high-efficiency tidal flow rate and the range of the artificial upwelling high-efficiency tidal flow rate.

[0064] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0065] one or more processors;

[0066] a memory for storing one or more programs;

[0067] 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.

[0068] In a fourth aspect, an embodiment of the present application 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.

[0069] Compared with the prior art, the present invention has the following beneficial effects:

[0070] The present invention calculates the transport efficiency and efficiency standard of the artificial upwelling plume by considering plume thickness, plume half-width, and effective transport range. Based on the transport efficiency and efficiency standard, the range of tidal flow velocities for high-efficiency transport of the artificial upwelling is calculated. This tidal flow range is used to control the operation of the artificial upwelling system. This method for calculating high-efficiency tidal flow velocities for artificial upwelling is more scientific and can more effectively improve the plume transport efficiency of the artificial upwelling system.

[0071] Aiming at the common linear stratified water environment in oceans and lakes, the present invention proposes a calculation method for the range of tidal flow velocity for efficient artificial upwelling, which can be applied to most water environments.

[0072] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] 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.

[0074] Figure 1 The present invention is a flow chart of a method for calculating the flow velocity of tidal currents for high-efficiency transport of artificial upwelling according to an exemplary embodiment.

[0075] Figure 2 The present invention is a flow chart of a method for calculating the flow velocity of tidal currents for high-efficiency transport of artificial upwelling according to an exemplary embodiment.

[0076] Figure 3 It is a schematic diagram of artificial upwelling plume transport when the horizontal cross flow velocity is less than the critical horizontal cross flow velocity according to an exemplary embodiment.

[0077] Figure 4 It is a schematic diagram of artificial upwelling plume transport when the horizontal cross flow velocity is greater than the critical horizontal cross flow velocity according to an exemplary embodiment.

[0078] Figure 5 The present invention is a flow chart of a method for calculating the flow velocity of tidal currents for high-efficiency transport of artificial upwelling according to an exemplary embodiment. DETAILED DESCRIPTION

[0079] The present invention will be described in further detail below with reference to the accompanying drawings.

[0080] In order to improve the plume transport efficiency of the artificial upwelling gas injection system, the present invention proposes a method for calculating the tidal flow velocity of the artificial upwelling with high efficiency. The technology is simple, reliable, easy to operate, and can be applied in both oceans and lakes.

[0081] Figure 1 and Figure 2 FIG. 1 is a flow chart showing a method for calculating the flow velocity range of an artificial upwelling high-efficiency tidal current according to an exemplary embodiment. Figure 1 and Figure 2 As shown, the method may include the following steps:

[0082] S1: Obtain the injection depth, the injection volume corresponding to the injection depth, the density gradient of seawater, the diameter of the injection nozzle, the ambient water density at the injection nozzle location, the density of the injected gas, the bubble slip velocity, the target height of the plume, the effective range of the plume, and the efficiency standard of the plume;

[0083] Specifically, the CTD sensor is used to measure the density of seawater dρ / dz and the ambient water density ρ at the injection nozzle position. a The gas injection depth h0 and the target height Z of the plume are determined by the object of the artificial upwelling system. AVG , effective range L E and the efficiency standard η E The diameter d0 of the gas injection nozzle is determined according to the design parameters, and the bubble sliding speed u s It is determined according to the aperture of the designed nozzle; the gas injection volume Q0 corresponding to the gas injection depth is determined according to the rated gas injection volume of the gas injection system.

[0084] The above steps collect the minimum parameters required to calculate the range of tidal flow rates for efficient artificial upwelling, further reducing the complexity of data collection for the artificial upwelling system, increasing the speed of uploading collected parameters, and thus increasing the running speed of the program.

[0085] S2: Calculating the initial buoyancy flux and buoyancy frequency according to the gas injection volume, the ambient water density at the gas injection nozzle location, the density of the injected gas, and the density gradient of the seawater;

[0086] According to the gas injection volume Q0 corresponding to the gas injection depth, the ambient water density ρ at the gas injection nozzle position a , the density gradient of seawater dρ / dz, calculate the initial buoyancy flux B0 and buoyancy frequency N;

[0087] Specifically, the calculation formulas for the initial momentum flux B0 and the buoyancy frequency N are as follows:

[0088]

[0089] Where B0 is the initial momentum flux, N is the buoyancy frequency, ρ a is the ambient water density at the injection nozzle location, ρ air is the density of injected gas, which is taken as 1.25 g / cm 3 ; g is the acceleration due to gravity, which is 9.81 m / s 2 ; dρ / dz is the density gradient of seawater.

[0090] The above steps calculate the momentum flux and buoyancy frequency required to describe the bubble plume, allowing the behavior of the bubble plume to be described mathematically, improving the accuracy of calculations for the range of tidal flow rates for efficient artificial upwelling.

[0091] S3: Calculating the critical horizontal cross-flow velocity based on the initial buoyancy flux, the buoyancy frequency, and the bubble slip velocity;

[0092] Specifically, the critical horizontal cross flow velocity u ∞e The calculation formula is as follows:

[0093]

[0094] Where u ∞e is the critical horizontal cross-flow velocity, u s is the bubble slip velocity.

[0095] The above steps determine the critical horizontal cross-flow velocity, which can be used to distinguish the flow pattern characteristics of the bubble plume at different horizontal cross-flow velocities, divide the artificial upwelling plume into two categories for classification calculation, and further improve the accuracy of the mathematical model.

[0096] S4: Calculating the range of tidal flow velocity for high-efficiency artificial upwelling when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the bubble slip velocity, the target height of the plume, and the effective range; which may include the following sub-steps:

[0097] S41: According to the bubble sliding speed u s , initial buoyancy flux B0 and buoyancy frequency N to calculate the height h of the artificial upwelling plume T And thickness L:

[0098]

[0099] L=1.02B0 1 / 4 N -3 / 4(5) The above steps determine the height and thickness that the artificial upwelling plume can reach when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity, and completely determine the morphology of the artificial upwelling plume.

[0100] S42: Based on the height h of the artificial upwelling plume T , plume thickness L, plume target height Z AVG And the effective range L E , calculate the transport efficiency η of the artificial upwelling plume:

[0101]

[0102] The above steps calculate the transport efficiency of the artificial upwelling plume when the horizontal cross-flow velocity of the artificial upwelling plume is less than the critical horizontal cross-flow velocity. It is an important indicator for evaluating the operating efficiency of the artificial upwelling system.

[0103] S43: According to the transport efficiency η of the artificial upwelling plume, the efficiency standard η E , the calculated horizontal cross flow velocity is less than the critical horizontal cross flow velocity u ∞e The range of tidal flow velocity U for high efficiency of artificial upwelling ∞1 , which can be expressed as follows:

[0104]

[0105] The above steps compare the artificial upwelling plume transport efficiency at the current horizontal cross flow velocity with the target transport efficiency to determine whether the horizontal cross flow velocity is less than the critical horizontal cross flow velocity u ∞e The system's high-efficiency transmission tidal velocity range ensures that the plume of the artificial upwelling system can be completely captured by the target height within this tidal velocity range.

[0106] S5: Calculating the range of the artificial upwelling high-efficiency tidal flow velocity when the horizontal cross flow velocity is greater than the critical horizontal cross flow velocity based on the critical horizontal cross flow velocity, the initial buoyancy flux, the buoyancy frequency, the gas injection depth, the gas injection volume corresponding to the gas injection depth, the bubble slip velocity, the diameter of the gas injection nozzle, the target height and effective range of the plume, the ambient water density, and the density of the injected gas; the range may include the following sub-steps:

[0107] S51: Calculate the range of tidal flow velocity with high efficiency of artificial upwelling by iterative method. The number of iterations is n, starting from 1. Each cycle ends with n=n+1. The horizontal cross flow velocity is updated to u in each iteration. ∞ =u ∞e +0.01n. According to the initial buoyancy flux B0, bubble slip velocity u s , horizontal cross flow velocity u∞ , the injection depth h0 and the injection volume q0 corresponding to the injection depth h0, the artificial upflow plume separation height z d and the plume half-width r at the separation position d :

[0108]

[0109] wherein α is the entrainment coefficient, calculated by the following formula:

[0110]

[0111] The above steps determine the artificial upflow plume separation height and the plume half-width at the separation position, which provide initial conditions for calculating the behavior of the bubble plume after separation by using the jet model.

[0112] S52: According to the artificial upflow plume separation height z d , the plume half-width r at the separation position d , the diameter d0 of the gas injection nozzle, the ambient water density ρ a at the position of the gas injection nozzle, the density of the injected gas ρ air , the injection volume Q0 corresponding to the injection depth h0, the horizontal cross-flow velocity u ∞ , the average vertical velocity u md of the plume at the separation point, the density ρ d :

[0113]

[0114] wherein u0 is the initial flow velocity of the plume, calculated as follows:

[0115]

[0116] The above steps calculate the average vertical velocity and the density of the plume at the separation point, further determining the initial conditions of the jet after the separation of the bubble plume.

[0117] S53: According to the plume half-width r at the separation position d , the average vertical velocity u md of the plume at the separation point, the density ρ d , the ambient water density ρ a at the position of the gas injection nozzle, the jet momentum M d and the buoyancy flux F d at the separation point are calculated:

[0118] M d = πu md 2 r d 2 (14)

[0119]

[0120] The above steps calculate the initial condition jet momentum and buoyancy flux used to describe the jet behavior, enabling the behavior of the artificial upwelling bubble plume after separation to be determined.

[0121] S54: According to the jet momentum M at the separation point of the separation position d , buoyancy flux F d and the plume half-width r at the separation position d , calculate the maximum rise height z of the plume m And the plume half-width b at the maximum rise height:

[0122]

[0123] Where β is the jet diffusion coefficient, which is taken as 0.17.

[0124] The above steps determine the height and width that the artificial upwelling plume can reach when the horizontal cross-flow velocity of the artificial upwelling plume is greater than the critical horizontal cross-flow velocity, and completely determine the shape of the artificial upwelling plume.

[0125] S55: According to the maximum rising height z of the plume m and the plume half-width b at the maximum rise height, calculate the transport efficiency η of the artificial upwelling plume under the current horizontal crossflow velocity n :

[0126]

[0127] The above steps calculate the transport efficiency of the artificial upwelling plume when the horizontal cross-flow velocity of the artificial upwelling plume is greater than the critical horizontal cross-flow velocity, which is an important indicator for evaluating the operating efficiency of the artificial upwelling system.

[0128] S56: According to the artificial upwelling plume transport efficiency η n , efficiency standard η E , record the first time η is reached during the iteration n >η E When n=n1 and iterates continuously, the first time η is reached n <η E When n=n2, n1<n2, calculate the horizontal cross flow velocity when it is greater than the critical horizontal cross flow velocity u ∞e , the range of tidal flow velocity that artificial upwelling can efficiently transport ∞2 :

[0129] U ∞2 =(u ∞e +n1,u ∞e+ n2) (19)

[0130] The above step determines whether the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity u ∞e The high-efficiency transport tidal current velocity range of the system ensures that the plume of the artificial upwelling system can be efficiently captured by the target height in the tidal current velocity range.

[0131] S6: Calculate the artificial upwelling high-efficiency transport tidal current velocity range according to the artificial upwelling high-efficiency transport tidal current velocity range and the artificial upwelling high-efficiency transport tidal current velocity range.

[0132] Specifically, the artificial upwelling high-efficiency transport tidal current velocity range U ∞ is:

[0133] U ∞ = U ∞1 ∪ U∞2 (20)

[0134] The above step realizes the calculation of the artificial upwelling high-efficiency transport tidal current velocity range U ∞ , and further the artificial upwelling system can be controlled to run only when the horizontal tidal current velocity is in the artificial upwelling high-efficiency transport tidal current velocity range U ∞ , so that the artificial upwelling plume generated by the artificial upwelling system can be efficiently captured by the target height and the target range, improving the efficiency of the system operation.

[0135] When the horizontal tidal current velocity is not in the range, the artificial upwelling plume will be partially or even completely unable to reach the set target height, making the artificial upwelling system completely ineffective; and the energy of the artificial upwelling system is limited, so that the system running at these horizontal tidal current velocities not in the high-efficiency range will only cause energy waste; therefore, calculating the artificial upwelling high-efficiency transport tidal current velocity range U ∞ can ensure the efficient operation of the artificial upwelling system.

[0136] Figure 3 is a schematic diagram of an artificial upwelling plume when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity according to an exemplary embodiment. Referring to Figure 3 , when the horizontal cross-flow velocity u ∞ is less than the critical horizontal cross-flow velocity u ∞e , the plume eventually diffuses radially at the neutral buoyancy layer height, and the plume height h T and the plume thickness L are also determined.

[0137] Figure 4FIG. 1 is a schematic diagram of an artificial upwelling plume when the horizontal flow velocity is greater than the critical horizontal cross-flow velocity according to an exemplary embodiment. Figure 4 , when the horizontal cross flow velocity u ∞ Greater than the critical horizontal cross-flow velocity u ∞e When the plume separates from the bubble, and rises to the maximum height, the plume height z m The plume half-width b is also determined accordingly.

[0138] Corresponding to the aforementioned embodiment of the method for calculating the flow velocity range of the tidal current with high efficiency in artificial upwelling, the present application also provides an embodiment of a device for calculating the flow velocity range of the tidal current with high efficiency in artificial upwelling.

[0139] Figure 5 This is a block diagram of a device for calculating the flow velocity range of an artificial upwelling with high efficiency transport of tidal current according to an exemplary embodiment. Figure 5 , the device includes

[0140] Acquisition module 1 is used to obtain the gas injection depth, the gas injection volume corresponding to the gas injection depth, the density gradient of seawater, the diameter of the gas injection nozzle, the ambient water density at the location of the gas injection nozzle, the density of the injected gas, the bubble slip velocity, the target height of the plume, the effective range of the plume, and the efficiency standard of the plume;

[0141] A first calculation module 2 is configured to calculate an initial buoyancy flux and a buoyancy frequency based on the gas injection volume, the ambient water density at the gas injection nozzle location, the density of the injected gas, and the density gradient of the seawater;

[0142] A second calculation module 3 is used to calculate the critical horizontal cross flow velocity according to the initial buoyancy flux, the buoyancy frequency and the bubble slip velocity;

[0143] A third calculation module 4 is configured to calculate a range of tidal flow velocities for high-efficiency artificial upwelling when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the bubble slip velocity, the target height of the plume, and the effective range;

[0144] A fourth calculation module 5 is configured to calculate a range of tidal flow velocities for high-efficiency transport of artificial upwelling when the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the gas injection depth, the gas injection volume corresponding to the gas injection depth, the bubble slip velocity, the diameter of the gas injection nozzle, the target height and effective range of the plume, the ambient water density, and the density of the injected gas;

[0145] The fifth calculation module 6 is used to calculate the range of the artificial upwelling high-efficiency tidal flow velocity according to the range of the artificial upwelling high-efficiency tidal flow velocity and the range of the artificial upwelling high-efficiency tidal flow velocity.

[0146] As to the apparatus in the above embodiments, the specific ways how the modules perform operations have been described in the embodiments of the method, which will not be elaborated here.

[0147] For the apparatus embodiments, since they basically correspond to the method embodiments, the relevant parts are described in the part of the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the modules can be selected to achieve the purposes of the present application according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0148] Correspondingly, 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 artificial upflow high-efficiency conveying tidal current flow velocity range calculation method as described above.

[0149] Correspondingly, the present application also provides a computer readable storage medium, which stores computer instructions, and the instructions are executed by a processor to implement the artificial upflow high-efficiency conveying tidal current flow velocity range calculation method as described above.

[0150] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The application is intended to cover any variations, uses or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the application is indicated by the appended claims.

[0151] It should be understood that the application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the claims that follow.

Claims

1. A method for calculating the flow velocity range of artificial upwelling with high efficiency, characterized in that: include: Obtain the gas injection depth, the gas injection volume corresponding to the gas injection depth, the density gradient of seawater, the diameter of the gas injection nozzle, the ambient water density at the location of the gas injection nozzle, the density of the injected gas, the bubble slip velocity, the target height of the plume, the effective range of the plume, and the efficiency standard of the plume; Calculating the initial buoyancy flux and the buoyancy frequency according to the gas injection volume, the ambient water density at the gas injection nozzle location, the density of the injected gas, and the density gradient of the seawater; Calculating a critical horizontal cross-flow velocity based on the initial buoyancy flux, the buoyancy frequency, and the bubble slip velocity; Calculate the range of tidal flow velocity for high-efficiency transport of artificial upwelling when the horizontal crossflow velocity is less than the critical horizontal crossflow velocity based on the critical horizontal crossflow velocity, initial buoyancy flux, buoyancy frequency, bubble slip velocity, target height of the plume, and effective range. ; The range of tidal flow velocity for high-efficiency transport of artificial upwelling when the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity is calculated based on the critical horizontal cross-flow velocity, initial buoyancy flux, buoyancy frequency, gas injection depth, gas injection volume corresponding to the gas injection depth, bubble slip velocity, diameter of the gas injection nozzle, target height and effective range of the plume, ambient water density and density of the injected gas. ; According to the range of the tidal flow velocity of the artificial upwelling with high efficiency and the range of tidal flow velocities that can be efficiently transported by artificial upwelling , calculate the range of tidal flow velocity for efficient artificial upwelling , as follows: 。 2. The method according to claim 1, characterized in that The calculation formulas for the initial buoyancy flux and buoyancy frequency are as follows: （1）； （2）； in, is the initial buoyancy flux, is the buoyancy frequency, is the ambient water density at the injection nozzle location, is the injected gas density, is the acceleration due to gravity, is the density gradient of seawater, is the gas injection volume corresponding to the gas injection depth.

3. The method according to claim 2, characterized in that The critical horizontal cross-flow velocity is calculated as follows: （3）； in, is the critical horizontal cross-flow velocity, is the bubble slip velocity.

4. The method according to claim 3, characterized in that The range of the artificial upwelling high-efficiency tidal flow velocity is calculated based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the bubble slip velocity, the target height of the plume, and the effective range when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity, including: The height and thickness of the artificial upwelling plume are calculated based on the bubble slip velocity, initial buoyancy flux, and buoyancy frequency: （4）； （5）； in, is the height of the artificial upwelling plume, is the thickness of the artificial upwelling plume; The transport efficiency of the artificial upwelling plume is calculated based on the height, thickness, target height, and effective range of the artificial upwelling plume: （6）； in, is the transport efficiency of the artificial upwelling plume, is the target height of the plume, is the effective range of the plume; According to the transport efficiency and efficiency standard of the artificial upwelling plume, the range of the tidal flow velocity of the artificial upwelling with high efficiency is calculated when the calculated horizontal cross flow velocity is less than the critical horizontal cross flow velocity: （7）； in, The range of tidal flow velocity for high-efficiency artificial upwelling when the horizontal cross-flow velocity is less than the critical horizontal cross-flow velocity. For efficiency standards.

5. The method according to claim 4, characterized in that The range of the tidal flow velocity for high-efficiency transport of artificial upwelling when the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity is calculated based on the critical horizontal cross-flow velocity, the initial buoyancy flux, the buoyancy frequency, the gas injection depth, the gas injection volume corresponding to the gas injection depth, the bubble slip velocity, the diameter of the gas injection nozzle, the target height and effective range of the plume, the ambient water density, and the density of the injected gas, including: The range of tidal flow velocity with high efficiency of artificial upwelling is calculated by iterative method, and the number of iterations is , starting from 1, each cycle ends , the horizontal cross flow velocity is updated in each iteration as Calculate the artificial upwelling plume separation height and the plume half-width at the separation position based on the initial buoyancy flux, bubble slip velocity, horizontal crossflow velocity, gas injection depth, and gas injection volume corresponding to the gas injection depth: （8）； （9）； in, is the artificial upwelling plume separation height, is the plume half-width at the artificial upwelling plume separation position, is the bubble slip velocity, is the initial buoyancy flux, is the buoyancy frequency, is the diameter of the gas injection nozzle, is the entrainment coefficient, which is calculated by the following formula: （10）； in, is the gas injection depth; The average vertical velocity and density of the plume at the separation point are calculated based on the separation height of the artificial upwelling plume, the half-width of the plume at the separation point, the diameter of the gas injection nozzle, the ambient water density at the gas injection nozzle, the density of the injected gas, the gas injection volume corresponding to the gas injection depth, and the horizontal cross-flow velocity: （11）； （12）； in, is the average vertical velocity of the plume at the separation point, is the density of the plume at the separation point, is the ambient water density at the injection nozzle location, is the density of the injected gas, is the horizontal cross flow velocity, is the initial velocity of the plume, which is calculated as follows: （13）； The jet momentum and buoyancy flux at the separation point are calculated based on the plume half-width at the separation point, the average vertical velocity and density of the plume at the separation point, and the ambient water density at the injection nozzle position: （14）； （15）； in, is the jet momentum at the separation point, is the jet buoyancy flux at the separation point; According to the jet momentum, buoyancy flux and plume half-width at the separation point of the separation position, the maximum rise height of the plume and the plume half-width at the maximum rise height are calculated: （16）； （17）； in, is the plume half-width at the maximum rise height, is the maximum rise height of the plume, is the jet diffusion coefficient; According to the maximum rise height of the plume and the half-width of the plume at the maximum rise height, the transport efficiency of the artificial upwelling plume under the horizontal crossflow velocity of the current iteration step is calculated: （18）； in, is the transport efficiency of the artificial upwelling plume at the current horizontal crossflow velocity, is the target height of the plume, is the effective range of the plume; According to the artificial upwelling plume transport efficiency , efficiency standards , records the first time reached during the iteration Corresponding to And after continuing to iterate, the first time Corresponding to , , when the calculated horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity, the range of the tidal flow velocity of the artificial upwelling with high efficiency is: （19）； in, is the critical horizontal cross-flow velocity, It is the range of tidal flow velocity for high-efficiency artificial upwelling when the horizontal cross-flow velocity is greater than the critical horizontal cross-flow velocity.

6. A device for calculating the flow velocity range of artificial upwelling with high efficiency, characterized in that: include: An acquisition module is used to obtain the gas injection depth, the gas injection volume corresponding to the gas injection depth, the density gradient of seawater, the diameter of the gas injection nozzle, the ambient water density at the location of the gas injection nozzle, the density of the injected gas, the bubble sliding speed, the target height of the plume, the effective range of the plume, and the efficiency standard of the plume; a first calculation module, configured to calculate an initial buoyancy flux and a buoyancy frequency according to the gas injection volume, the ambient water density at the gas injection nozzle location, the density of the injected gas, and the density gradient of the seawater; a second calculation module, configured to calculate a critical horizontal cross-flow velocity based on the initial buoyancy flux, the buoyancy frequency, and the bubble slip velocity; The third calculation module is used to calculate the range of the artificial upwelling high-efficiency tidal flow velocity when the horizontal cross flow velocity is less than the critical horizontal cross flow velocity based on the critical horizontal cross flow velocity, initial buoyancy flux, buoyancy frequency, bubble slip velocity, target height of the plume and effective range. ; The fourth calculation module is used to calculate the range of the artificial upwelling high-efficiency tidal flow rate when the horizontal cross flow velocity is greater than the critical horizontal cross flow velocity, the initial buoyancy flux, the buoyancy frequency, the gas injection depth, the gas injection volume corresponding to the gas injection depth, the bubble slip velocity, the diameter of the gas injection nozzle, the target height and effective range of the plume, the ambient water density and the density of the injected gas. ; The fifth calculation module is used to efficiently transport the tidal flow velocity range according to the artificial upwelling. and the range of tidal flow velocities that can be efficiently transported by artificial upwelling , calculate the range of tidal flow velocity for efficient artificial upwelling , as follows: 。 7. 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 implement the method according to any one of claims 1 to 5.

8. 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 any one of claims 1 to 5 are implemented.

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