A method, system, equipment and medium for calculating water resistance ratio of cage facilities in river waters

Abstract

The present invention proposes a method, system, equipment and medium for calculating the water resistance ratio of cage facilities in river water areas. The method comprises: obtaining cross-sectional data of river hydrology, and calculating the water-passing cross-sectional area of ​​the river section where the cages are located based on the cross-sectional data; obtaining aerial images of the river water area, analyzing the types of cages in the river water area based on the aerial images, determining the float parameters of each cage based on the cage type, and calculating the degree of water resistance of the float / floating frame in the cage in the water through the float parameters to obtain the water-resistance area of ​​the float; obtaining mesh parameters corresponding to each cage in the river water area, determining the degree of resistance of the mesh to water flow through the mesh parameters to obtain the water-resistance area of ​​the mesh; and calculating the water resistance ratio of the cage facility in the river section based on the water-passing cross-sectional area, the mesh water-resistance area and the float water-resistance area, clarifying the water resistance ratio of the cage facility to facilitate subsequent research on the impact of cage aquaculture on flood control safety.

Description

Technical Field

[0001] The present invention relates to the technical field of flood control in river and lake waters, and in particular to a method, system, equipment and medium for calculating the water resistance ratio of cage facilities in river waters. Background Art

[0002] Cage aquaculture is a major water-related activity in rivers and lakes. The expansion of cage aquaculture and its irregular practices pose potential risks to river flow during flood season. Investigations have revealed that in recent years, river cage facilities have been damaged by floodwaters in some river basins across China, impacting downstream hydropower stations and water conservancy projects. The water resistance ratio of cage facilities, a comprehensive parameter reflecting the cages' impact on flood resistance, is a key factor in assessing the impact of cage aquaculture on river flooding and is crucial for studying the impact of cage aquaculture on flood control safety.

[0003] However, since cage facilities are different from other river-related constructions, the water permeability of cage equipment will bring certain complexity to the prediction of water resistance. There is no specific research in China on the calculation method of the water resistance ratio of cage facilities in river waters. Therefore, it is crucial to clarify the water resistance ratio of cage facilities. Summary of the Invention

[0004] The present invention provides a method, system, device, and medium for calculating the water resistance ratio of cage facilities in river waters to solve the problems existing in related technologies. The technical solution is as follows:

[0005] In a first aspect, an embodiment of the present invention provides a method for calculating the water resistance ratio of a cage facility in a river water area, comprising:

[0006] Obtain the cross-sectional data of the river hydrology and calculate the cross-sectional area of ​​the river where the cage is located based on the cross-sectional data;

[0007] Obtain aerial images of the river waters, analyze the types of cages in the river waters based on the aerial images, determine the float parameters of each cage based on the cage type, calculate the water blocking degree of the float / floating frame in the cage using the float parameters, and obtain the water blocking area of ​​the float;

[0008] Obtain the net parameters corresponding to each cage in the river water area, determine the degree of obstruction of the net to the water flow through the net parameters, and obtain the water blocking area of ​​the net;

[0009] The water resistance ratio of the cage facility in the river section is calculated by calculating the water-passing cross-sectional area, the water-blocking area of ​​the net and the water-blocking area of ​​the float.

[0010] In one embodiment, the cross-sectional data includes river depth, river surface width, and river bottom width; and calculating the cross-sectional area of ​​the river section where the cage is located based on the cross-sectional data includes:

[0011] Calculate the average width of the river surface and the river bottom width to obtain the average width of the river cross section;

[0012] Calculate the product of the average width and the river depth to obtain the water-passing cross-sectional area.

[0013] In one embodiment, it further includes:

[0014] Processing aerial images based on geospatial analysis algorithms to determine cage parameters, including cage location, cage type, cage size, and number of cages;

[0015] Establish corresponding river channel model according to cage parameters and cross-section data;

[0016] Real-time river flow data is obtained and added to the river model, and the cage layout angle between the long axis of the cage and the water flow direction is determined based on the river model.

[0017] In one embodiment, determining the degree of obstruction of the net to water flow by the net parameters, and obtaining the water-blocking area of ​​the net includes:

[0018] Calculate the projection area of ​​the net in the direction of water flow according to the cage layout angle and net parameters;

[0019] Analyze the degree of overlap between the front and rear nets in the cage according to the net parameters to obtain the net overlap rate, and determine the correction factor according to the net overlap rate and the adjustment coefficient;

[0020] The projected area is corrected by the correction factor to obtain the water-blocking area of ​​the mesh.

[0021] In one embodiment, the float parameters of each cage are determined according to the cage type, and the water blocking degree of the float / floating frame in the cage is calculated using the float parameters to obtain the water blocking area of ​​the float, which includes:

[0022] When the cage type is a circular cage provided with buoyancy by a cage float, the obtained float parameters include the float diameter and the underwater depth of the float;

[0023] The product of the float frame diameter and the underwater depth of the float frame is calculated to obtain the water blocking area of ​​the float frame.

[0024] In one embodiment, the float parameters of each cage are determined according to the cage type, and the water blocking degree of the float / floating frame in the cage is calculated using the float parameters to obtain the water blocking area of ​​the float, which includes:

[0025] When the cage type is a polygonal cage with buoyancy provided by additional floats, the obtained float parameters include the underwater depth of the float, the length of a single float perpendicular to the water flow direction, and the number of floats perpendicular to the water flow direction;

[0026] The product of the underwater depth of the float, the length of the float and the number of floats is calculated to obtain the water-blocking area of ​​the float.

[0027] In one embodiment, it further includes:

[0028] Compare the water resistance ratio of the cage facility with the preset range to determine whether the water resistance ratio of the cage facility is within the preset range, and issue an abnormal prompt for the calculation result of the water resistance ratio of the cage facility that exceeds the preset range.

[0029] In a second aspect, an embodiment of the present invention provides a system for calculating the water resistance ratio of cage facilities in river water areas, which executes the above-mentioned method for calculating the water resistance ratio of cage facilities in river water areas.

[0030] In a third aspect, embodiments of the present invention provide an electronic device comprising: a memory and a processor. The memory and the processor communicate with each other via an internal connection path, the memory is configured to store instructions, and the processor is configured to execute the instructions stored in the memory. When the processor executes the instructions stored in the memory, the processor performs the method according to any of the aforementioned embodiments.

[0031] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program runs on a computer, the method in any one of the above-mentioned embodiments is executed.

[0032] The advantages or beneficial effects of the above technical solution include at least:

[0033] The present invention generally calculates the water resistance of the underwater part of the cage, that is, the water resistance area of ​​the net, analyzes the impact of the floating frame / floating body in the cage facility on water resistance, and calculates the water resistance ratio of the cage facility in the river water area in combination with the measured water-passing cross-sectional area of ​​the river section where the cage is located. The method innovatively summarizes and proposes a calculation method for the water resistance ratio of the cage facility in the river water area, so as to facilitate the subsequent formulation of corresponding flood risk management strategies based on the water resistance ratio of the cage facility, such as adjusting the cage layout, adding flood discharge channels or implementing other flood control measures, so as to ensure that the design and layout of the cage facility meet the flood control requirements and minimize the impact on floods.

[0034] Since domestic flood impact assessment standards and specifications are only applicable to physical projects such as docks and bridges, they are not applicable to permeable facilities. The calculation method of the water resistance ratio of cage facilities proposed in this invention fills the gap in domestic research on the water resistance ratio of cages of permeable facilities in river waters, and can provide a reference for the subsequent improvement of flood impact assessment guidelines and specifications, thereby providing technical support for water administration departments to strengthen the management of river-related construction projects.

[0035] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed herein and should not be construed as limiting the scope of the invention.

[0037] Figure 1 Schematic diagram of the flow of the method for calculating the water resistance ratio of cage facilities in river waters of the present invention;

[0038] Figure 2 It is a three-dimensional diagram and a plan view of a circular cage of the present invention;

[0039] Figure 3 It is a three-dimensional diagram and a plan view of a square cage of the present invention;

[0040] Figure 4 Schematic diagram of the distribution of cage facilities in typical river sections;

[0041] Figure 5 This is a schematic diagram of the river topography of a typical cross-section of a river section for cage aquaculture;

[0042] Figure 6 FIG. 1 is a structural block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0044] Example 1

[0045] An embodiment of the present invention provides a method for calculating the water resistance ratio of cage facilities in river waters.

[0046] It's important to explain that the water resistance ratio reflects the extent of a building's occupation of a river channel and the degree of water resistance. It's generally calculated as the ratio of the area blocked from flowing water (projected in the direction of flow) to the total cross-sectional area of ​​the river channel at a given water level. The water resistance ratio of a cage facility is the quotient of the cage's water resistance area and the total cross-sectional area of ​​the river channel at that water level.

[0047] The object of the calculation method of the water resistance ratio of the cage facilities in the river water area of ​​this embodiment is the server. Figure 1 As shown, the execution steps specifically include:

[0048] Step S1: Obtain the cross-sectional data of the river hydrology, and calculate the water-passing cross-sectional area of ​​the river section where the cage is located based on the cross-sectional data.

[0049] Specifically, the stepped features of the river section can be depicted based on on-site investigation or measurement of river hydrological cross-section data, where the cross-section data includes the water depth data and topographic data of the river.

[0050] Among them, the stepped feature refers to the fact that the river section presents a step-like shape in the vertical direction. In the measured river depth data and topographic data, the stepped feature can be identified by observing the undulating changes in the bottom of the river.

[0051] In depicting river channel cross-sections, using a corresponding number of inverted isosceles trapezoidal cross-sections can better simulate the stepped characteristics of a river channel. Specifically, the terrace surface of each step can be considered the upper or lower base of the inverted isosceles trapezoid (depending on the viewing direction), while the terrace slope can be considered the two legs of the trapezoid. Since the terrace surface is typically relatively flat, it can be simplified to a straight line or an approximate straight line; the terrace slope, on the other hand, exhibits a certain inclination angle due to the erosive action of the river. Therefore, when depicting a stepped river channel cross-section, a series of inverted isosceles trapezoids can be used to approximate the shape and size of each step.

[0052] After determining the number of steps in the stepped river section and the parameters of the inverted isosceles trapezoid of each step, the area of ​​the inverted isosceles trapezoid of each step can be added together to obtain the total area, which is equivalent to the water-passing cross-sectional area of ​​the river section where cage aquaculture is located.

[0053] In this embodiment, by conducting on-site surveys or measuring river hydrological cross-sectional data, cross-sectional data such as river depth, river surface width, and river bottom width are obtained. The expression for calculating the water-passing cross-sectional area of ​​the river section where the cage is located based on the cross-sectional data is:

[0054]

[0055] Among them, h s is the river depth, L s is the width of the river surface, L x The width of the riverbed.

[0056] In the expression of water flow cross-sectional area, is the width of the river surface L s and the river bottom width L xThe average value of the river cross section is the average width of the river; the average width is divided by the river depth h s Multiply them to get the water flow cross-sectional area Ah.

[0057] For mountainous rivers, especially V-shaped rivers, the riverbed width Lx is very small relative to the water surface width and water depth, and has little effect on the cross-sectional area of ​​the water flow. Therefore, it can be ignored and the value is 0. In this case, the expression of the cross-sectional area of ​​the water flow can be simplified to:

[0058] A h =L s* h s .

[0059] Step S2: Obtain an aerial image of the river water area, analyze the types of cages in the river water area based on the aerial image, determine the float parameters of each cage based on the cage type, and the degree of water blocking of the float / floating frame in the cage in the water to obtain the water blocking area of ​​the float.

[0060] It should be noted that, according to the type of cage, if the buoyancy of the cage is provided by a float (such as foam or an iron barrel), the calculated buoyancy water blocking area can also be called the buoyancy water blocking area; assuming that the buoyancy of the cage is provided by a float on the cage, the calculated buoyancy water blocking area can also be called the buoyancy water blocking area, in order to distinguish the two different situations.

[0061] This example analyzes the overall situation of cage aquaculture in a certain river section through aerial photography, and analyzes the design elements of cage layout in the river water area, specifically:

[0062] Take high-resolution orthophotos, which can be used to measure the size and distribution of cages, and even take oblique photography to obtain three-dimensional information of the cages;

[0063] Processing aerial images based on geospatial analysis algorithms to determine cage parameters, including cage location, cage type, cage size, and number of cages;

[0064] Establish a corresponding river channel model based on the cage parameters and cross-section data. The river channel model can be a three-dimensional model or an orthophoto map;

[0065] Real-time river flow data is obtained and added to the river model. The river model can simulate the relationship between the cages and the water flow in the river according to the water flow data, and thus determine the cage layout angle between the long axis of the cage and the water flow direction based on the river model.

[0066] In some embodiments, a corresponding compilation report can also be generated based on the statistical design elements of the cage layout (cage type, number of cages, angle between the cage and the water flow direction, etc.) to facilitate subsequent water resistance ratio calculation.

[0067] Different types of cages, such as square, round, or irregularly shaped cages, have different structures and geometries, which directly affect the calculation of the water-blocking area of ​​the float. To improve the accuracy of calculating the water-blocking area of ​​the float, this embodiment determines the float parameters for each cage based on the cage type after determining the cage type. The float parameters are then used to calculate the water-blocking area of ​​the float in water.

[0068] It should be noted that buoyancy refers to objects that provide buoyancy, and the objects that provide buoyancy on the cage can be divided into two types: floating tubes and floats. The methods for calculating the water blocking area of ​​buoyancy for cages with different buoyancy are different, as follows:

[0069] For circular cage facilities, the floats of the cage facilities are originally equipped with float tubes to provide buoyancy; after the cage facilities are placed in the water, the float tubes are laid directly on the water surface. When calculating the resistance area of ​​the floats, the size of the floats and the underwater depth of the floats need to be considered.

[0070] For square cages, the floats are typically welded steel frames. These frames themselves lack buoyancy, so they require additional floats (such as foam or metal barrels) to suspend them above the water. Since the floats don't come into direct contact with the water, they generally don't create any water resistance. In this case, the float resistance area for the square cages must be calculated, taking into account the size of the additional floats and the water depth.

[0071] In this embodiment, the cage type can be determined by aerial images, or by surveys. When the cage type is a circular cage facility, such as Figure 2 As shown, the buoyancy is provided by the floats of the cage itself. In this case, the float parameters that need to be obtained include the float diameter and the underwater depth of the float. The water blocking area of ​​the float is obtained by calculating the product of the float diameter and the underwater depth.

[0072] Floating frame water blocking area A of circular cage facility jz The expression is:

[0073] A jz =h j ×d j ;

[0074] Among them, h j is the underwater depth of the floating frame, d j is the diameter of the floating frame.

[0075] It should be noted that the underwater depth and size of the floating frame can be measured directly in the water body using measuring tools (such as a tape measure, a depth gauge); the floating frame can also be photographed using underwater photography equipment, and the size and depth information in the photograph can then be analyzed using image processing technology; the size and underwater depth of the floating frame can also be measured by other methods, which are not listed here.

[0076] When the cage type is a square cage facility, such as Figure 3 As shown in the figure, the underwater depth and size of the additional float in the square cage facility (for example, square plastic foam is used as the float) are obtained, and the calculation expression for the float water blocking area of ​​the entire square cage facility is:

[0077] A tz =h t ×L t ×N;

[0078] Among them, h t The underwater depth of a single float (i.e. the depth of a square plastic foam / iron barrel underwater);

[0079] L t The length of a single float perpendicular to the direction of water flow;

[0080] N is the number of floats perpendicular to the water flow direction.

[0081] Another consideration is whether the floats are deployed individually or in rows. If they are deployed in rows, the spacing between the floats needs to be considered, as the effective water blocking area may be reduced by the gaps between the floats. Therefore, the calculation of the water blocking area of ​​the floats needs to be adjusted based on the actual deployment situation.

[0082] Specifically, taking iron drums as an example, the water-blocking area of ​​a single drum can be adjusted by the effective water-blocking coefficient. The effective water-blocking coefficient needs to be determined based on the layout density and arrangement of the drums. For regularly arranged drums, this can be determined through experimental measurements or literature research. For example, for tightly packed drums, the effective water-blocking coefficient may be close to 1, while for arrangements with large gaps, the effective water-blocking coefficient may be less than 1. The layout density can be expressed as the ratio of the drum diameter to the center distance, where the center distance refers to the distance between the centers of two adjacent drums.

[0083] In other embodiments, hydraulic design software or fluid dynamics simulation tools can be used to more accurately simulate and calculate the water resistance area of ​​the buoy, and field tests can be conducted to measure the actual water flow velocity and resistance, calibrate the calculation model, and ensure the accuracy of the estimation.

[0084] Step S3: Obtain the net parameters corresponding to each net cage in the river water area, determine the degree of obstruction of the net to the water flow through the net parameters, and obtain the water blocking area of ​​the net.

[0085] In addition to the water resistance caused by the buoyancy of the cage facility in contact with the water surface, the net in the cage facility will also have a certain degree of resistance underwater. Therefore, it is also necessary to roughly calculate the actual water resistance area of ​​the underwater part of the cage, that is, the water resistance area of ​​the net.

[0086] The water-blocking area of ​​the net is actually the water-blocking area of ​​the net wire, which is mainly determined by the net's frontal area, the diameter of the net wire, the side length of the mesh, the overlapping rate of the front and rear nets, and the angle between the net and the water flow direction. The frontal area of ​​the net includes the area of ​​the net wire and the area of ​​the mesh.

[0087] On this basis, the net parameters of the cage are obtained, which can be measured in advance before the cage is put into use; the net parameters specifically include the diameter of the mesh, the side length of the mesh, the depth of the mesh, the width or diameter of the mesh, the angle between the plane where the mesh is located and the direction of the water flow, etc.

[0088] The calculation method of the water-blocking area of ​​the mesh in this embodiment is:

[0089] Step S31: Calculating the projected area of ​​the net in the direction of water flow according to the angle between the plane where the net is located and the direction of water flow, as well as the parameters of the net.

[0090] The expression of the projected area of ​​the net in the direction of water flow is:

[0091] h y D y sinθ;

[0092] Among them, h y Represents the depth of the net, that is, the size of the net perpendicular to the direction of water flow;

[0093] D y Represents the width or diameter of the net, that is, the size of the net parallel to the direction of water flow;

[0094] sinθ represents the sine of the angle between the plane of the net and the direction of the water flow, because only the part of the net that is perpendicular to the direction of the water flow can completely block the water flow.

[0095] It's important to note that the angle between the plane of the net and the direction of the water flow, also known as the net's angle of attack, can be calculated using a hydrodynamic model. During the simulation, the angle between the long axis of the net cage and the direction of the water flow is known. Assuming a relatively uniform flow distribution within the cage and relatively stable water flow conditions, the net's angle of attack (i.e., the angle between the net plane and the water flow direction) can be estimated using the hydrodynamic model. The calculation can even be simplified by assuming the cage structure and net installation method are known, and that the water flow conditions are relatively stable. The net's angle of attack can be approximated to the cage's angle of attack.

[0096] Step S32: Analyze the degree of overlap between the front and rear nets in the net box according to the net parameters to obtain the net overlap rate, and determine the correction factor according to the net overlap rate and the adjustment coefficient.

[0097] When meshes overlap, the actual water-blocking area increases because the overlapping areas also create resistance to water flow. Therefore, this embodiment comprehensively considers the local characteristics of the meshes, determines the degree of overlap between the front and rear meshes, and obtains the mesh overlap ratio. This parameter is used to adjust the calculation to reflect the actual overlap of the meshes, and generally takes a value between 0 and 1; when n = 0, it indicates no overlap; when n = 1, it indicates complete overlap.

[0098] In this embodiment, considering the influence of the wire diameter on the effective mesh area, the actual water blocking area of ​​NetEase is adjusted by adjusting the coefficient. The expression of the adjustment coefficient is:

[0099]

[0100] Where λ is the mesh side length and d is the mesh wire diameter.

[0101] The correction factor is determined according to the mesh overlap rate and the adjustment coefficient. In this embodiment, the correction factor is expressed as follows:

[0102]

[0103] Step S33: Correct the projection area of ​​the net in the water flow direction by using the correction factor to obtain the water-blocking area of ​​the net. The expression of the water-blocking area of ​​the net is:

[0104]

[0105] Where λ is the mesh side length;

[0106] d is the diameter of the network cable;

[0107] h y is the depth of the net;

[0108] D y is the width or diameter of the net;

[0109] θ is the angle between the plane where the net is located and the direction of water flow, θ = 0° ~ 90°;

[0110] n is the overlap rate, which is the degree of overlap between the front and rear mesh and the mesh line, and is generally between 0 and 1.

[0111] It should be noted that the order of step S1, step S2 and step S3 can be swapped, and step S1, step S2 and step S3 can also be executed simultaneously. The calculation order of the water-passing cross-sectional area, the buoy water-blocking area and the net water-blocking area is not limited here. As long as the calculation of each area is completed, step S4 can be executed.

[0112] Step S4: Calculate the water blocking ratio of the cage facility in the river section by using the water-passing cross-sectional area, the water blocking area of ​​the net and the water blocking area of ​​the buoy.

[0113] This embodiment comprehensively considers factors such as cage-net permeability and overlap rate, buoyancy, floatation, and river channel cross-sectional area, and derives the calculation formula for the water resistance ratio of cage facilities in a typical river section:

[0114]

[0115] Where: d is the diameter of the network cable;

[0116] λ is the mesh side length;

[0117] h y is the depth of the net;

[0118] D y is the width or diameter of the net;

[0119] n is the mesh overlap ratio;

[0120] θ is the cage layout angle between the long axis of the cage and the direction of water flow, or the angle between the plane of the net and the direction of water flow;

[0121] h j is the underwater depth of the floating frame;

[0122] d j is the diameter of the floating frame;

[0123] A tz is the water blocking area of ​​the floating body;

[0124] h s For the depth of the river;

[0125] L s is the width of the river surface;

[0126] L x The width of the riverbed. For mountain rivers, which are generally V-shaped rivers, the bottom width can be 0.

[0127] It should be noted that in the water resistance ratio formula of the cage facility, h j ×d j The calculation is the floating frame water blocking area A of the circular cage facility jz , and A tz represents the floating body water blocking area of ​​the square cage facility. The two can be calculated according to the type of cage actually used. If a circular cage facility is actually used, then A tz is zero; if the actual use is a square cage facility, then h j ×d j is zero.

[0128] The water resistance ratio of cage facilities may affect flood flow velocity, flood water levels, and flood flow. Cages with high water resistance ratios significantly reduce water flow velocity, thereby affecting the speed and scope of flood propagation. However, a high water resistance ratio may cause water levels to rise, increasing flood risk. The water resistance ratio may also reduce flood flow through a specific area, potentially affecting flood risk in downstream areas. Therefore, the calculated water resistance ratio of cage facilities is compared with a pre-set reasonable range to determine whether the water resistance ratio is within the reasonable range. Calculated water resistance ratios outside the reasonable range are reported as abnormal. Flood risk management strategies can be developed based on the water resistance ratio of cage facilities, such as adjusting cage layout, adding flood discharge channels, or implementing other flood control measures. This ensures that the design and layout of cage facilities meet flood control requirements and minimizes the impact of flooding.

[0129] This embodiment analyzes the impact of different facilities such as nets, floating frames, and floats in cage facilities on water resistance, and comprehensively considers the factors of the overlapping rate of nets in front and behind the cages, thereby calculating the water resistance ratio of cage facilities in river water areas. The parameters used in this method have clear sources and are simple to calculate. It can accurately calculate the water resistance ratio of cage facilities in river water areas, solves the problem of the water resistance ratio of permeable facilities in flood impact assessment of cage aquaculture projects in rivers, fills the gap in the field of water resistance ratio calculation in flood impact assessment of river-related permeable facility projects, and can provide a technical reference for standardizing and improving the management of flood impact assessment of river-related construction projects.

[0130] The following is an example of a power station reservoir area where cage aquaculture is arranged in a river. The typical cross section of the river section where cage aquaculture is arranged is selected (such as Figure 4 ), calculating the water resistance ratio of different types of cage facilities such as circular cages and square cages, to illustrate the method of this embodiment, including the following steps:

[0131] First, the analysis of hydrological data of typical sections of river sections with cage aquaculture:

[0132] Based on the results of a river channel topography survey and on-site investigation, a river channel topography cross-section diagram of the section where the river cage facility is located is drawn. Figure 5 Field investigations revealed that at a typical river section, when the water level is 2033 m (normal reservoir level), the section has a surface width of 386.4 m, a riverbed width of 120 m, a riverbed elevation of 2016 m, and a maximum water depth of 17 m. The hydrological characteristics of typical river sections are shown in Table 1.

[0133] Table 1 Basic hydrological characteristics of typical river sections

[0134]

[0135]

[0136] Second, analysis of the current status of cage facilities layout in typical cross-section river waters

[0137] According to on-site investigations, 60 cages are deployed in this section of the river, including 22 circular cages and 38 square cages. Multiple cages are connected and arranged in single or double rows perpendicular to the flow (θ = 90°) on the left side of the river. The diameter of a single circular cage ranges from 13 to 19 meters, while the dimensions of the square cages are 10m x 10m and 12m x 12m.

[0138] Three cages are arranged in a typical section, including one circular cage and two square cages:

[0139] Round cage specifications: cage diameter d1 = 19m, net depth h y1 =7m, mesh side length λ1 = 3cm, mesh wire diameter d2 = 3mm. The floating frame adopts a circular double-tube structure made of high-density polyethylene (HDPE). The tubes in the floating frame provide buoyancy so that the circular cage can float on the water surface. The diameter of the tubes is d3 = 0.28m.

[0140] Square cage specifications: cage size 10m×10m, net depth h y2 = 3m, mesh side length λ2 = 2cm, and mesh wire diameter d4 = 2mm. The cage uses a cylindrical iron drum as a float, with a length of 0.9m and a diameter of d5 = 0.6m. The basic characteristics of circular and square cages are detailed in Table 2.

[0141] Table 2 Typical cross-section cage facility layout characteristics

[0142]

[0143] The third is the calculation and analysis of the water blocking area of ​​the typical cross-section cage facilities

[0144] (1) Netting water blocking area

[0145] Based on the on-site investigation and measured data of the diameter, underwater depth, wire diameter, mesh size, overlap ratio of the front and rear nets of circular and square cages, the water-blocking area of ​​the net was calculated using the formula for the water-blocking area of ​​the net. See Table 3 for details.

[0146] Table 3 Water blocking area of ​​net

[0147]

[0148] (2) Floating frame water blocking area

[0149] Based on the on-site investigation and the measured diameter of the circular cage float frame, the diameter of the float tube, and the underwater depth of the float tube, the water blocking area of ​​the float frame was calculated using the formula for the water blocking area of ​​the float frame. See Table 4 for details.

[0150] Table 4 Water blocking area of ​​floating frame

[0151]

[0152] (3) Floating body water blocking area

[0153] According to the on-site investigation and the measured data on the form, quantity, size and underwater depth of the typical cross-section square cage floats, the cage facilities in this river section use cylindrical iron barrels as floats. Two square cages are equipped with a total of four floats. The water-facing surfaces of the four floats are all circular in cross-section. The underwater depth of the water-facing surface of a single float is 0.3m. The underwater area of ​​the float is half of the circular cross-section area. Therefore, the water-blocking area of ​​a single float is 0.14m. 2 The water blocking area of ​​the floating body of a typical cross section is calculated using the formula for the water blocking area of ​​the floating body. See Table 5 for details.

[0154] Table 5 Water blocking area of ​​buoy

[0155]

[0156] (4) Water resistance ratio of cage facilities

[0157] Based on measured cross-sectional data such as water level elevation, riverbed elevation, water surface width, and riverbed width at typical river sections, and on-site surveys of square and circular cages, including the number, specifications, dimensions, underwater depth, and length of the water-facing surface, of nets, buoys, and floats, the water-resistance ratios of circular and square cages for typical sections of aquaculture in this river were estimated to be 0.94 and 0.31, respectively, and 1.25 for typical sections. The calculation results are shown in Table 6.

[0158]

[0159] Table 6 Water resistance ratio of different types of cage facilities in typical sections

[0160]

[0161] Example 2

[0162] This embodiment provides a system for calculating the water resistance ratio of cage facilities in river water areas, which executes the above-mentioned method for calculating the water resistance ratio of cage facilities in river water areas.

[0163] The water resistance ratio calculation system for cage facilities in river waters includes:

[0164] The river channel analysis module is used to obtain the cross-sectional data of the river channel hydrology and calculate the water-passing cross-sectional area of ​​the river channel section where the cage is located based on the cross-sectional data.

[0165] The buoy resistance calculation module is used to obtain aerial images of the river water area, analyze the types of cages in the river water area based on the aerial images, determine the buoy parameters of each cage according to the cage type, and calculate the water resistance area of ​​the buoy through the buoy parameters.

[0166] The net resistance calculation module is used to obtain the net parameters corresponding to each net box in the river water area, determine the degree of obstruction of the net to the water flow through the net parameters, and obtain the net water blocking area;

[0167] The water resistance ratio calculation module is used to calculate the water resistance ratio of the cage facility in the river section through the water-passing cross-sectional area, the water resistance area of ​​the net and the water resistance area of ​​the buoy.

[0168] The functions of each module in the system of the embodiment of the present invention can be found in the corresponding description of the above method, which will not be repeated here.

[0169] Example 3

[0170] This embodiment provides an electronic device, Figure 6 FIG. 1 shows a structural block diagram of an electronic device according to an embodiment of the present invention. Figure 6 As shown, the electronic device includes a memory 100 and a processor 200. The memory 100 stores a computer program executable on the processor 200. When the processor 200 executes the computer program, it implements the method for calculating the water resistance ratio of a cage facility in a river water area described in the above embodiment. The number of the memory 100 and the processor 200 can be one or more.

[0171] The electronic device also includes:

[0172] The communication interface 300 is used to communicate with external devices and perform data exchange transmission.

[0173] If the memory 100, the processor 200, and the communication interface 300 are implemented independently, the memory 100, the processor 200, and the communication interface 300 can be connected to each other via a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc.

[0174] Optionally, in a specific implementation, if the memory 100, the processor 200 and the communication interface 300 are integrated on a chip, the memory 100, the processor 200 and the communication interface 300 can communicate with each other through an internal interface.

[0175] An embodiment of the present invention provides a computer-readable storage medium storing a computer program. When the program is executed by a processor, the method provided in the embodiment of the present invention is implemented.

[0176] An embodiment of the present invention further provides a chip, which includes a processor for calling and executing instructions stored in a memory, so that a communication device equipped with the chip executes the method provided by the embodiment of the present invention.

[0177] An embodiment of the present invention also provides a chip, comprising: an input interface, an output interface, a processor and a memory, wherein the input interface, the output interface, the processor and the memory are connected via an internal connection path, and the processor is used to execute the code in the memory. When the code is executed, the processor is used to execute the method provided by the embodiment of the invention.

[0178] It should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. It is worth noting that the processor may be a processor that supports the advanced reduced instruction set machine (ARM) architecture.

[0179] Furthermore, optionally, the above-mentioned memory may include read-only memory and random access memory, and may also include non-volatile random access memory. The memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may include read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM) or flash memory. The volatile memory may include random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available. For example, static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM) and direct rambus RAM (DR RAM).

[0180] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another.

[0181] In the description of this specification, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless otherwise inconsistent.

[0182] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0183] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications and substitutions within the technical scope disclosed in the present invention, and such modifications and substitutions are intended to be encompassed by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for calculating the water resistance ratio of cage facilities in river waters, characterized in that: include: Obtaining cross-sectional data of river hydrology, and calculating the water-passing cross-sectional area of ​​the river section where the cage is located based on the cross-sectional data; Acquire an aerial image of the river water area, analyze the types of cages in the river water area based on the aerial image, determine the float parameters of each cage based on the cage type, calculate the water blocking degree of the float / floating frame in the cage in the water based on the float parameters, and obtain the water blocking area of ​​the float; Obtaining the net parameters corresponding to each net cage in the river water area, determining the degree of obstruction of the net to the water flow based on the net parameters, and obtaining the water blocking area of ​​the net; The water resistance ratio of the cage facility in the river section is calculated by the water-passing cross-sectional area, the water-blocking area of ​​the net, and the water-blocking area of ​​the buoy. The calculation formula for the water resistance ratio of the cage facility in a typical cross-sectional area of ​​the river water area is: Where: d is the diameter of the wire; λ is the side length of the mesh; h y is the depth of the net; D y is the width or diameter of the net; n is the net overlap ratio; θ is the angle between the long axis of the net and the direction of water flow, or the angle between the plane of the net and the direction of water flow; h j is the underwater depth of the floating frame; d j is the diameter of the floating frame; A tz is the water blocking area of ​​the floating body; h s is the river depth; L s is the width of the river surface; L x The width of the riverbed.

2. The method for calculating the water resistance ratio of cage facilities in river waters according to claim 1, characterized in that: The cross-sectional data includes the river depth, the river surface width, and the river bottom width; and the calculation of the water-passing cross-sectional area of ​​the river section where the cage is located based on the cross-sectional data includes: Calculating the average of the water surface width of the river channel and the river bottom width to obtain the average width of the river channel cross section; The product of the average width and the water depth of the river channel is calculated to obtain the water-passing cross-sectional area.

3. The method for calculating the water resistance ratio of cage facilities in river waters according to claim 1, characterized in that: Also includes: Processing the aerial images based on a geospatial analysis algorithm to determine cage parameters, including cage location, cage type, cage specifications, and cage quantity; Establishing a corresponding river channel model according to the cage parameters and the cross-section data; Real-time river flow data is acquired and added to the river model, and the cage arrangement angle between the long axis of the cage and the water flow direction is determined based on the river model.

4. The method for calculating the water resistance ratio of cage facilities in river waters according to claim 3, characterized in that: The method of determining the degree of obstruction of the net to the water flow by the net parameters and obtaining the water-blocking area of ​​the net includes: Calculating the projection area of ​​the net in the direction of water flow according to the cage arrangement angle and the net parameters; Analyzing the degree of overlap between the front and rear nets in the net cage according to the net parameters to obtain a net overlap rate, and determining a correction factor according to the net overlap rate and an adjustment coefficient; The projected area is corrected by the correction factor to obtain the water-blocking area of ​​the mesh.

5. The method for calculating the water resistance ratio of cage facilities in river waters according to claim 1, characterized in that: The buoyancy parameters of each cage are determined according to the cage type, and the water blocking degree of the float / floating frame in the cage is calculated by the buoyancy parameters to obtain the water blocking area of ​​the buoyancy device. When the cage is a circular cage provided with buoyancy by a cage float, the obtained float parameters include the float diameter and the underwater depth of the float; The product of the diameter of the floating frame and the underwater depth of the floating frame is calculated to obtain the water blocking area of ​​the floating frame.

6. The method for calculating the water resistance ratio of cage facilities in river waters according to claim 1, characterized in that: The buoyancy parameters of each cage are determined according to the cage type, and the water blocking degree of the float / floating frame in the cage is calculated by the buoyancy parameters to obtain the water blocking area of ​​the buoyancy device. When the cage type is a polygonal cage provided with buoyancy by additional floats, the obtained float parameters include the underwater depth of the float, the length of a single float perpendicular to the water flow direction, and the number of floats perpendicular to the water flow direction; The product of the underwater depth of the float, the length of the float and the number of the floats is calculated to obtain the water blocking area of ​​the float.

7. The method for calculating the water resistance ratio of cage facilities in river waters according to claim 1, characterized in that: Also includes: The water resistance ratio of the cage facility is compared with a preset range to determine whether the water resistance ratio of the cage facility is within the preset range, and an abnormal prompt is given for the calculation result of the water resistance ratio of the cage facility that exceeds the preset range.

8. A water resistance ratio calculation system for cage facilities in river waters, characterized in that: Execute the method for calculating the water resistance ratio of cage facilities in river waters as described in any one of claims 1 to 7.

9. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores instructions, and the instructions are loaded and executed by the processor to implement the method for calculating the water resistance ratio of the cage facility in the river water area according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for calculating the water resistance ratio of cage facilities in river waters according to any one of claims 1 to 7 is implemented.

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