River water area net cage facility water blocking ratio calculation method, system, equipment and medium

Abstract

The invention provides a river water area net cage facility water blocking ratio calculation method, system and device and a medium, and the method comprises the steps: obtaining the section data of river hydrology, and calculating the water passing section area of the river section where a net cage is located according to the section data; the method comprises the following steps: acquiring an aerial image of a river water area, analyzing a net cage type in the river water area according to the aerial image, determining a floating tool parameter of each net cage according to the net cage type, calculating a water blocking degree of a floating body / a floating frame in the net cage in water through the floating tool parameter, and obtaining a floating tool water blocking area; obtaining a netting parameter corresponding to each net cage in the water area of the river channel, and determining the blocking degree of the netting to the water flow through the netting parameter to obtain a netting water blocking area; and calculating the water blocking ratio of the net cage facility of the river channel section through the water-passing section area, the netting water blocking area and the floating tool water blocking area, and determining the water blocking ratio of the net cage facility so as to facilitate the subsequent research on the influence of net cage culture 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 an important water-related project in rivers and lakes. With the expansion of cage aquaculture and irregular aquaculture, it poses a potential risk to the normal flow of water in rivers during the flood season. According to investigations, in recent years, some river basins in China have experienced cases where river cage facilities were destroyed by floods during the flood season, affecting downstream hydropower stations and water conservancy hubs. The water resistance ratio of cage facilities is a comprehensive parameter that reflects the impact of cages on flood resistance. It is a key factor in evaluating the impact of cage aquaculture on river floods and has an extremely important impact on 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 on the calculation method of the water resistance ratio of cage facilities in river waters in China. Therefore, it is crucial to clarify the water resistance ratio of cage facilities. Summary of the invention

[0004] The embodiment of 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 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 water area, analyze the types of cages in the river water area 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 in the water through the float parameters, and obtain the water blocking area of ​​the float;

[0008] 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 water blocking area of ​​the net;

[0009] The water blocking 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 buoy.

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

[0011] Calculate the average width of the river surface and the river bottom 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 cross-sectional area of ​​the water.

[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 cage number;

[0015] Establish the corresponding river channel model according to the 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, the degree of obstruction of the net to the water flow is determined by the net parameters, and the water blocking area of ​​the net is obtained, which includes:

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

[0019] Analyze the 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;

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

[0021] In one embodiment, 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 buoyancy water blocking area, 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 floating frame diameter and the underwater depth of the floating frame is calculated to obtain the water blocking area of ​​the floating frame.

[0024] In one embodiment, 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 buoyancy water blocking area, which includes:

[0025] 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 float 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 floating body, the length of the floating body and the number of floating bodies is calculated to obtain the water blocking area of ​​the floating body.

[0027] In one embodiment, it further includes:

[0028] 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.

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

[0030] In a third aspect, an embodiment of the present invention provides an electronic device, the device comprising: a memory and a processor. The memory and the processor communicate with each other through an internal connection path, the memory is used to store instructions, the processor is used to execute the instructions stored in the memory, and when the processor executes the instructions stored in the memory, the processor executes the method in any one of the above-mentioned 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 calculates the water resistance degree of the underwater part of the cage, that is, the water resistance area of ​​the net, analyzes the influence of the floating frame / floating body in the cage facility on the 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. An innovative summary is proposed to calculate 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 according to the water resistance ratio of the cage facility, such as adjusting the cage layout, increasing 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, but not to permeable facilities, the cage facility water resistance ratio calculation method proposed in the present invention fills the gap in domestic research on the cage water resistance ratio 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 parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present invention and should not be regarded as limiting the scope of the present invention.

[0037] Figure 1 It is a flow chart of a 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 schematic diagram of a circular cage of the present invention;

[0039] Figure 3 It is a three-dimensional diagram and a plan schematic diagram of a square net box 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 The structure block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0044] Embodiment 1

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

[0046] It should be explained that the water blocking ratio can be used to reflect the proportion of the building's occupation of the river channel and the degree of water blocking, which is generally the ratio of the water blocking area (projected area in the direction of water flow) at the water level to the total cross-sectional area of ​​the river channel. The water blocking ratio of the cage facility is the quotient of the water blocking area of ​​the cage facility and the total cross-sectional area of ​​the river channel at the water level.

[0047] The object of executing the method for calculating the water resistance ratio of 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 according to 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 step-like 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 terrain data, the step-like feature can be identified by observing the ups and downs of the river bottom.

[0051] In the depiction of river channel sections, the use of a corresponding number of inverted isosceles trapezoidal sections can better simulate the river channel section with stepped characteristics, that is, the terrace surface of each step can be regarded as the upper or lower base of the inverted isosceles trapezoid (depending on the direction of observation), and the terrace slope can be regarded as the two waists of the trapezoid. Since the terrace surface is usually relatively flat, it can be simplified to a straight line or an approximate straight line; while the terrace slope presents a certain inclination angle due to the downcutting erosion of the river. Therefore, when depicting a stepped river channel 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 inverted isosceles trapezoid parameters of each step, the inverted isosceles trapezoid area of ​​each step can be added to obtain the total area, which is equivalent to the water-passing cross-sectional area of ​​the river section where cage culture is located.

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

[0056] In the expression of water-passing 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 channel; the average width is divided by the river channel depth h s Multiply them to get the water flow cross-sectional area Ah.

[0057] For mountain 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 ​​water flow, so it can be ignored and taken as 0. In this case, the expression of the cross-sectional area of ​​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 type of cages in the river water area based on the aerial image, determine the buoyancy parameters of each cage based on the cage type, the degree of water blocking of the float / floating frame in the cage in the water, and obtain the water blocking area of ​​the buoy.

[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 water-blocking area of ​​the float can also be referred to as the water-blocking area of ​​the float; assuming that the buoyancy of the cage is provided by a float frame on the cage, the calculated water-blocking area of ​​the float can also be referred to as the water-blocking area of ​​the float frame, in order to distinguish between two different situations.

[0061] This embodiment analyzes the overall situation of cage aquaculture in a certain river section by 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 specifications, and cage number;

[0064] Establish a corresponding river channel model according to 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, so as to 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 calculation of the water resistance ratio.

[0067] Different types of cages, such as square, round or irregular cages, have different structures and geometric shapes, which directly affect the calculation of the water blocking area of ​​the float. In order to improve the calculation accuracy of the water blocking area of ​​the float, this embodiment determines the float parameters of each cage according to the cage type after determining the cage type, and calculates the water blocking area of ​​the float in the water through the float parameters.

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

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

[0070] For square cage facilities, the floating frame is basically welded steel frame, and the floating frame itself does not have buoyancy, so it needs to be suspended on the water surface by additional floats (such as foam or iron barrels, etc.). The floating frame does not directly contact the water surface, so the floating frame generally does not produce water resistance. In this case, for square cage facilities, the floating body resistance area needs to be calculated, and the additional floating body size and floating body water depth need to be considered.

[0071] In this embodiment, the cage type can be determined by aerial images, and the cage type can also be understood by survey. When the cage type is a circular cage facility, such as Figure 2 As shown, the buoyancy is provided by the float 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 of the float.

[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 tape measures, depth gauges); the floating frame can also be photographed using underwater photography equipment, and then the size and depth information in the photos can 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, the underwater depth and size of the additional float in the square cage facility (for example, square plastic foam is used as the float), the calculation expression of 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 It is the underwater depth of a single float (i.e. the depth of a square plastic foam / iron barrel under water);

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

[0080] N is the number of floating bodies in the direction perpendicular to the water flow.

[0081] In addition, it is also necessary to consider whether the floating bodies are arranged individually or in rows. If they are arranged in rows, the spacing between the floating bodies needs to be considered, because the effective water blocking area may be reduced due to the gaps between the floating bodies. Therefore, the calculation of the floating body water blocking area needs to be adjusted according to the actual layout.

[0082] Specifically, taking an iron barrel as an example, the water blocking area of ​​a single iron barrel can be adjusted by the effective water blocking coefficient. The effective water blocking system needs to be determined based on the layout density and the arrangement of the iron barrels. For regularly arranged iron barrels, it can be obtained through experimental measurement or literature search; for example, for closely arranged iron barrels, the effective water blocking coefficient may be close to 1, while for arrangements with large gaps, the effective water blocking coefficient will be less than 1. Among them, the layout density can be expressed by the ratio of the diameter of the iron barrel to the center distance, and the center distance refers to the distance between the centers of two adjacent iron barrels.

[0083] In other embodiments, hydraulic design software or fluid dynamics simulation tools may be used to more accurately simulate and calculate the water blocking area of ​​the buoy, and field tests may 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 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 water blocking area of ​​the net.

[0085] In addition to the water blocking 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 blocking area of ​​the underwater part of the cage, that is, the water blocking 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 flow area, the diameter of the net wire, the side length of the mesh, the overlap rate of the front and rear nets, and the angle between the net and the water flow direction. The frontal flow 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 net wire, the side length of the mesh, the net depth, the net width or diameter, the angle between the plane where the net is located and the water flow direction, etc.

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

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

[0090] The expression of the projection 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 should be noted that the angle between the plane where the net is located and the direction of the water flow, also known as the angle of attack of the net, can be obtained by simulation using a hydrodynamic model. During the simulation, the angle between the long axis of the net and the direction of the water flow is known. Assuming that the water flow inside the net is relatively uniform, and under relatively stable water flow conditions, the angle of attack of the net (i.e., the angle between the plane of the net and the direction of the water flow) can be estimated using a hydrodynamic model. The calculation can even be simplified. Assuming that the structure of the net and the installation method of the net are known, and the water flow conditions are relatively stable, the angle of attack of the net may be close to the layout angle of the net.

[0096] Step S32: Analyze the 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 the mesh is overlapped, the actual water blocking area will increase, because the overlapping part will also produce resistance to the water flow. Therefore, this embodiment comprehensively considers the local characteristics of the mesh, determines the degree of overlap between the front and rear meshes, and obtains the mesh overlap rate. This parameter is used to adjust the calculation to reflect the actual overlap of the mesh, and generally takes a value between 0 and 1; when n=0, it means no overlap; when n=1, it means complete overlap.

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

[0099]

[0100] Among them, 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. The expression of the correction factor in this embodiment is:

[0102]

[0103] Step S33: Correct the projection area of ​​the net in the water flow direction by 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] Among them, 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 cable, 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: The water blocking ratio of the cage facility in the river section is calculated by using the water-passing cross-sectional area, the water blocking area of ​​the net and the water blocking area of ​​the buoy.

[0113] In this embodiment, the calculation formula of the water resistance ratio of the cage facility in a typical section of the river water area is deduced by comprehensively considering the factors such as the water permeability and overlap rate of the cage-net, the floating frame, the floating body and the cross-sectional area of ​​the river water:

[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 The depth of the river;

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

[0126] L x It is the width of the river bottom. In mountainous areas, rivers are generally V-shaped rivers, and 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 , while 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 square cage facility is actually used, then h j ×d j is zero.

[0128] The water resistance ratio of cage facilities may affect the flood flow speed, flood water level, flood flow, etc. Cages with high water resistance ratios will significantly reduce the water flow speed, thereby affecting the propagation speed and impact range of floods; however, high water resistance ratios may cause water levels to rise, increasing flood risks; water resistance ratios may also reduce flood flow through specific areas, which may affect the flood risk in downstream areas. Therefore, the calculated water resistance ratio of cage facilities is compared with the pre-set reasonable range to determine whether the water resistance ratio of cage facilities is within the reasonable range. The calculation results of the water resistance ratio of cage facilities that exceed the reasonable range are abnormally prompted, and corresponding flood risk management strategies are formulated according to the water resistance ratio of cage facilities, such as adjusting the cage layout, increasing flood discharge channels, or implementing other flood control measures, to ensure that the design and layout of cage facilities meet flood control requirements and minimize the impact on floods.

[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 before and after the cages, thereby calculating the water resistance ratio of cage facilities in river waters. The parameters used in this method have clear sources and are simple to calculate. The water resistance ratio of cage facilities in river waters can be accurately calculated, which 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 takes a power station reservoir area where cage aquaculture is arranged in a river as an example, and selects a typical section of the river section where cage aquaculture is arranged (such as Figure 4 ), calculating the water resistance ratio of different types of cage facilities such as round 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 culture:

[0132] Based on the results of a river channel topographic survey and on-site investigation, a river channel topographic cross-section diagram of the section where the river cage facilities are located is drawn. For details, see Figure 5 Through on-site investigation, when the water level of the typical section is 2033m (normal water level of the reservoir), the water surface width of the section is 386.4m, the river bottom width is 120m, the river bottom elevation is 2016m, and the maximum water depth is 17m. The hydrological characteristics of the typical river section are shown in Table 1.

[0133] Table 1 Basic hydrological characteristics of typical cross-section rivers

[0134]

[0135]

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

[0137] According to the on-site investigation, there are 60 cage facilities in this river section, including 22 round cages and 38 square cages. Multiple cages are connected together and arranged in single or double rows perpendicular to the water flow direction (θ=90°) on the left side of the river. The diameter of a single round cage is 13 to 19 meters, and the size of the square cage is 10m×10m and 12m×12m.

[0138] There are 3 cages arranged in a typical section, including 1 round cage and 2 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 floating tube structure, high-density polyethylene (HDPE) material, the floating tube in the floating frame provides buoyancy so that the circular net box can float on the water surface, and the floating tube diameter d3=0.28m.

[0140] Square cage specifications: cage size 10m×10m, net depth h y2 =3m, mesh side length λ2 = 2cm, mesh wire diameter d4 = 2mm. The cage uses a cylindrical iron barrel as a float, the length of the iron barrel is 0.9m, and the diameter d5 = 0.6m. The basic characteristics of the circular cage and the square cage 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) Water-blocking area of ​​the net

[0145] Based on the on-site investigation and measured data on the diameter, underwater depth, mesh diameter, mesh size, overlap rate of front and back nets of circular and square cages, the water-blocking area of ​​the net is 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] According to the on-site investigation and the measured diameter of the circular cage float frame, the diameter of the float pipe, and the underwater depth of the float pipe, the water blocking area of ​​the float frame is 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 of the form, quantity, size and underwater depth of the square cage floats of typical cross-sections, 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, and 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 by the formula of the water blocking area of ​​the floating body, see Table 5 for details.

[0154] Table 5 Water blocking area of ​​floating body

[0155]

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

[0157] According to the measured cross-sectional data such as water level elevation, river bottom elevation, water surface width, river bottom width, etc. of typical cross-sectional water level elevation of the river channel, the number, specifications, dimensions, underwater depth and length of the water-facing surface of square and round cages, nets, floating frames and floats were investigated on site. The water resistance ratio of round and square cages in typical cross-sectional water sections of cage aquaculture river sections was calculated to be 0.94 and 0.31 respectively, and the water resistance ratio of cage facilities in typical cross-sectional water sections was 1.25. The calculation results are shown in Table 6.

[0158]

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

[0160]

[0161] Embodiment 2

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

[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 based on the cage type, and calculate the buoy water resistance area 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 water blocking area of ​​the net;

[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 refer to the corresponding description in the above method, which will not be repeated here.

[0169] Embodiment 3

[0170] This embodiment provides an electronic device, Figure 6 FIG. 2 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, wherein the memory 100 stores a computer program that can be run on the processor 200. When the processor 200 executes the computer program, the water resistance ratio calculation method of the cage facility in the river water area in the above embodiment is implemented. 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 through 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, etc. 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, which implements the method provided in the embodiment of the present invention when executed by a processor.

[0176] An embodiment of the present invention further provides a chip, which includes a processor for calling and executing instructions stored in the memory from the 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, including: 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 supporting the advanced RISC machines (ARM) architecture.

[0179] Further, optionally, the above-mentioned memory may include a read-only memory and a random access memory, and may also include a non-volatile random access memory. The memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may include a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may include a 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, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.

[0181] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0182] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0183] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope 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 according to the cross-sectional data; Acquire an aerial image of a river water area, analyze the type of cages in the river water area according to the aerial image, determine the floatation parameters of each cage according to the cage type, calculate the water blocking degree of the float / floating frame in the cage in the water by the floatation parameters, and obtain the water blocking area of ​​the float; Obtaining the net parameters corresponding to each net box in the river water area, determining the degree of obstruction of the net to the water flow through the net parameters, and obtaining the water blocking area of ​​the net; The water blocking 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.

2. The method for calculating the water resistance ratio of cage facilities in river waters according to claim 1 is characterized in that: The cross-sectional data include the river depth, the river surface width, and the river bottom width; the calculation of the 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 is characterized in that: Also includes: Processing the aerial images based on a geospatial analysis algorithm to determine cage parameters, the cage parameters including cage location, cage type, cage specification, and cage number; Establishing a corresponding river channel model according to the cage parameters and the cross-section data; Real-time river flow data is obtained 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 is characterized in that: The method of determining the degree of obstruction of the net to the water flow by the net parameters to obtain the water blocking area of ​​the net includes: Calculating the projection area of ​​the net in the water flow direction according to the net cage arrangement angle and the net parameters; Analyze the degree of overlap between the front and rear nets in the net box according to the net parameters to obtain a net overlap rate, and determine a correction factor according to the net overlap rate and an adjustment coefficient; The projection area is corrected by the correction factor to obtain the water-blocking area of ​​the net.

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

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 cage facilities in a river water area as described in 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 a river water area according to any one of claims 1 to 7 is implemented.

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