Method, system and medium for calculating water flow resistance of branching rigid vegetation in slope area by averaging

Abstract

This application relates to a method, system, and medium for calculating the flow resistance of branching rigid vegetation in a slope area using an average process. The method includes determining a volume correction coefficient for the rigid vegetation in the slope area; determining the area density of the rigid vegetation in the slope area; determining the base elevation of any individual rigid vegetation plant in the slope area; determining the average submerged depth of the rigid vegetation in the slope area; determining the average flow velocity between the main stems of the rigid vegetation in the slope area; determining the hydraulic radius of the rigid vegetation in the slope area; and determining the flow resistance coefficient of the rigid vegetation in the slope area. This application provides technical support for further understanding the flow resistance coefficient of rigid vegetation under different submerged conditions from a hydraulic theory perspective.

Description

Technical Field

[0001] The present application relates to the field of vegetation hydraulic calculation, and in particular to a method, system and medium for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging. Background Art

[0002] Abundant vegetation cover plays a vital role in reducing flow, blocking sediment, and protecting soil and water. Due to the structural characteristics of vegetation's root system, vegetation cover increases flow resistance, reducing runoff erosion. Furthermore, plant roots stabilize soil, enhancing soil erosion resistance and thus reducing soil erosion. For vegetation on slopes, flow resistance is closely related not only to parameters such as the amount, density, and type of vegetation itself, but also to the slope gradient and length. Previous calculations of flow resistance parameters for rigid vegetation on slopes often generalized the vegetation into cylindrical rod-like structures. This is partly due to the complex branching structure of plants and partly because it is difficult to quantitatively calculate the relationship between vegetation flooding depth and resistance. Therefore, comprehensively considering the morphological characteristics, density, amount, and slope gradient of branching rigid vegetation on slopes can improve the accuracy of previous studies when calculating the corresponding flow resistance coefficient. This provides important technical support for engineering design and ecological protection of river sections with branching rigid vegetation. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a method, system and medium for averaging and calculating the water flow resistance of branching rigid vegetation in slope areas, so as to provide technical support for river ecological protection and bank slope protection.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging, comprising the following steps:

[0006] Step 1: Determine the volume correction coefficient of rigid vegetation in the slope area;

[0007] Step 2: Determine the rigid vegetation area density in the slope area;

[0008] Step 3: Determine the bottom elevation of any rigid vegetation in the slope area;

[0009] Step 4: Determine the average inundation depth of rigid vegetation in the slope area;

[0010] Step 5: Determine the average flow velocity between the main stems of rigid vegetation in the slope area;

[0011] Step 6: Determine the hydraulic radius of the rigid vegetation in the slope area;

[0012] Step 7: Determine the water flow resistance coefficient of the rigid vegetation in the slope area.

[0013] The volume correction coefficient of the rigid vegetation in the slope area is determined. For a single rigid vegetation with many branches, the actual water blocking area A is a There is a certain conversion relationship between the water blocking area A of the trunk and the branch type rigid vegetation volume correction coefficient α, then A a =αA, which represents the projection area of ​​a single rigid plant with many branches on the water surface. The volume correction coefficient α of the branched rigid plant is expressed as the ratio of the plant volume to the volume of a cylindrical rod with the same diameter under the same submergence conditions, which is: Where W is the submerged volume of rigid vegetation under a certain submerged water depth; W a is the flooded volume of the cylindrical rod under the same flooding depth conditions, W and W a All of these can be calculated through indoor experimental measurements.

[0014] Specifically, the rigid vegetation area density of the slope area is determined as follows: the rigid vegetation area density β of the slope area represents the area occupied by the rigid vegetation stems on the unit bed surface. For a rectangular uniformly distributed vegetation array, the density is given by To calculate, where S1 and S2 represent the vertical and horizontal stem center distances of adjacent vegetation, respectively, and A d It is the horizontal cross-sectional area of ​​a single plant, measured through indoor experiments.

[0015] The method of determining the bottom elevation of any rigid vegetation in the slope area is as follows: for a uniformly distributed vegetation array, the vegetation height is defined as h m , the maximum water depth is h max Through indoor experimental measurements, it is found that the elevation at the foot of the slope is z0 = 0, and the elevation of the vegetation at the top of the slope is z n , n is the number of vegetation rows, the elevation difference between adjacent plants on the same section is Δz = S2tanθ, θ is the slope angle, for a uniformly distributed vegetation array, starting from the lowest elevation, the bottom elevation z of the i-th plant is i =iS2tanθ, if z i If the vegetation at the location is flooded, then there is h max -z i =h max -iS2tanθ>0, that is, i<h max / S2tanθ, where the slope foot is obtained through indoor experimental measurement.

[0016] The specific method for determining the average submerged depth of rigid vegetation in the slope area is: i The vegetation at the site is divided into (1) elevation z according to the flooding situation i If the vegetation is not flooded, then h max -z i≤0; (2) Elevation z i If the vegetation is partially flooded, then 0≤h max -z i ≤h m ; (3) Elevation z i If the vegetation is completely flooded, then h max -z i ≥h m , defining p as the number of rows of flooded vegetation, then The largest integer with p≤n, if z i If all vegetation at the location is submerged, then h max -(z i +h m )≥0, define q as the number of vegetation rows that are completely submerged, and q as the number that satisfies The maximum positive integer with q≤n, according to the above definitions of p and q, the total submerged depth of vegetation is The average submerged depth of vegetation

[0017]

[0018] The determination of the average flow velocity between the main stems of the rigid vegetation in the slope area is carried out by using an averaging method due to the existence of the slope. For the water body on the unit horizontal bed surface, the average depth is half of the maximum water depth, that is, For the flow area A', the flow area of ​​water on the unit bed is obtained by subtracting the cross-sectional area from the effective water blocking area of ​​vegetation. Then, the flow area of ​​water on the unit bed is A' = Bh a -αβ·Bh a =(1-αβ)·Bh a , where B is the width of the main groove area, h a is the flooding depth of the vegetation, which is measured through indoor experiments. The average flow velocity between the main stems of rigid vegetation is Where V is the average flow velocity in the section where the rigid vegetation is located. The actual flow area of ​​the water flow is obtained through indoor experimental measurements. The average flow velocity between vegetation stems is

[0019] The specific method for determining the hydraulic radius of rigid vegetation in the slope area is: for plants with uniform rectangular distribution, the average volume of fluid per unit horizontal bed surface is At this time, the unit bed surface should be the unit horizontal bed surface, not the unit bed surface on the actual slope. The vegetation water blocking area is taken as the projection area along the direction of water flow. For the vegetation array on the slope, the average water blocking area of ​​the vegetation on the unit horizontal bed surface is The average hydraulic radius of the vegetation unit horizontal plane on the slope can be obtained as

[0020]

[0021] Specifically, for rigid vegetation with many branches, after introducing the volume correction coefficient α, the water flow resistance of a single rigid vegetation can be expressed as: Where C a is the water flow resistance coefficient of the rigid vegetation in the slope area, ρ is the fluid density, and assuming that the bed surface is smooth, the force balance of the entire water body in the vegetation area can be calculated as follows: Where L is the length of the vegetation area, which is obtained through indoor experimental measurements. The average resistance coefficient of the prototype rigid vegetation on the slope is The calculation formula of the resistance coefficient expressed in terms of the average hydraulic radius is:

[0022] In a second aspect, an embodiment of the present application provides a system for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging processing, comprising:

[0023] Correction coefficient determination module, used to determine the volume correction coefficient of rigid vegetation in the slope area;

[0024] Rigid vegetation area density calculation module, used to determine the rigid vegetation area density in the slope area;

[0025] Bottom elevation calculation module, used to determine the bottom elevation of any rigid vegetation in the slope area;

[0026] Average inundation depth calculation module, used to determine the average inundation depth of rigid vegetation in slope areas;

[0027] Average flow velocity calculation module, used to determine the average flow velocity between the main stems of rigid vegetation in the slope area;

[0028] Hydraulic radius calculation module, used to determine the hydraulic radius of rigid vegetation in slope areas;

[0029] The water flow resistance coefficient calculation module is used to determine the water flow resistance coefficient of rigid vegetation in the slope area.

[0030] In a third aspect, an embodiment of the present application provides a computer-readable storage medium storing a program code. When the program code is executed by a processor, the steps of the method for calculating the water flow resistance of branching rigid vegetation in the slope area by averaging processing as described above are implemented.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This application leverages the morphological characteristics of branching rigid vegetation, as well as measured data on the experimental environment and flow conditions (water depth, flow velocity, etc.) along slopes. By introducing a volume correction parameter for branching rigid vegetation, this method further optimizes the previous method of simply generalizing rigid vegetation to cylindrical rods. This method averages the flooded depth and vegetation resistance, deriving the average flooded depth of all vegetation and deriving the average resistance of all vegetation. This method improves the accuracy of calculating the flow resistance of branching rigid vegetation along slopes. The calculations are based on sufficient data, the method's mechanism is clear, the implementation process is straightforward, and the technical approach is feasible. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a flow chart of the method of the present invention.

[0035] Figure 2 This is a test model diagram of this application.

[0036] Figure 3 This is a comparison chart between the calculated and measured values ​​of the water flow resistance coefficient of branch-type rigid vegetation in the slope area. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] The terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0039] The terms "first," "second," etc. are only used to distinguish one entity or operation from another entity or operation, and are not to be understood as indicating or implying relative importance, nor are they to be understood as requiring or implying any actual relationship or order between these entities or operations.

[0040] like Figure 1 As shown, the present invention provides a method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging processing, which specifically includes: determining the volume correction coefficient of the rigid vegetation in the slope area, determining the area density of the rigid vegetation in the slope area, determining the bottom elevation of any rigid vegetation in the slope area, determining the average submergence depth of the rigid vegetation in the slope area, determining the average flow velocity between the main stems of the rigid vegetation in the slope area, determining the hydraulic radius of the rigid vegetation in the slope area, and determining the water flow resistance coefficient of the rigid vegetation in the slope area.

[0041] Step 1: Determine the volume correction coefficient of rigid vegetation in the slope area;

[0042] For a single rigid branched plant, its actual water blocking area (A a ) is often calculated by introducing the rigid vegetation volume correction coefficient α between the main trunk water blocking area (A), which is A a =αA, where α is expressed as the ratio of the volume of vegetation to the volume of a cylindrical rod of the same diameter under the same flooding conditions, which is Where W is the submerged volume of rigid vegetation under a certain submerged water depth; W a is the flooded volume of the cylindrical rod under the same flooding depth conditions, W and W a All of these can be measured through indoor experiments.

[0043] Step 2: Determine the rigid vegetation area density in the slope area;

[0044] For a rectangular uniformly distributed vegetation array, the rigid vegetation area density in the slope area can be obtained by To calculate, where S1 and S2 represent the vertical and horizontal stem center distances of adjacent vegetation, respectively, and A d It is the horizontal cross-sectional area of ​​a single plant, which can be measured through indoor experiments.

[0045] Step 3: Determine the bottom elevation of any rigid vegetation in the slope area;

[0046] For a uniformly distributed vegetation array, the vegetation height is defined as h m , the maximum water depth is h max , can be obtained through indoor experimental measurement. Assuming that the elevation of the slope foot is z0 = 0, the elevation of the vegetation at the top of the slope is z n (n is the number of vegetation rows), the elevation difference between adjacent plants on the same section is Δz = S2tanθ (θ is the slope gradient), for a uniformly distributed vegetation array, starting from the lowest elevation, the bottom elevation z of the i-th plant is i =iS2tanθ, if z i If the vegetation at the location is flooded, then there is hmax -z i =h max -iS2tanθ>0, that is, i<h max / S2tanθ, where the slope foot θ can be obtained through indoor experimental measurement.

[0047] Step 4: Determine the average inundation depth of rigid vegetation in the slope area;

[0048] For the height z i The vegetation at the site can be divided into (1) elevation z i If the vegetation is not flooded, then h max -z i ≤0; (2) Elevation z i If the vegetation is partially flooded, then 0≤h max -z i ≤h m ; (3) Elevation z i If the vegetation is completely flooded, then h max -z i ≥h m . Define p as the number of rows of flooded vegetation, then The largest integer with p≤n, if z i If all vegetation at the location is submerged, then h max -(z i +h m )≥0. Define q as the number of rows of vegetation that are completely submerged. According to step 3, we know that q satisfies The maximum positive integer with q≤n, according to the above definitions of p and q, the total submerged depth of vegetation is The average submerged depth of vegetation

[0049]

[0050] Step 5: Determine the average flow velocity between the main stems of rigid vegetation in the slope area

[0051] For the rigid vegetation in the slope area, due to the existence of slope, the averaging method is used for processing. For the water body on the unit horizontal bed, its average depth is half of the maximum water depth, that is, The flow area A' can be obtained by subtracting the cross-sectional area from the effective water-blocking area of ​​vegetation. Then the flow area of ​​water on the unit bed surface is A' = Bh a -αβ·Bh a =(1-αβ)·Bh a , where B is the width of the main groove area, h a is the water depth of the vegetation, which can be measured through indoor experiments. The average flow velocity between the main stems of rigid vegetation is Where V is the average flow velocity in the section where the rigid vegetation is located, which can be measured through indoor experiments. The actual flow area of ​​the water flow is The average flow velocity between vegetation stems is

[0052] Step 6: Determine the hydraulic radius of the rigid vegetation in the slope area

[0053] For plants with uniform rectangular distribution, the average volume of fluid per unit horizontal bed surface is In this case, the unit bed surface should be the unit horizontal bed surface, not the unit bed surface on the actual slope. The vegetation water blocking area is taken as the projection area along the direction of water flow. For the vegetation array on the slope, the average water blocking area of ​​the vegetation on the unit horizontal bed surface is The average hydraulic radius of the vegetation unit horizontal plane on the slope can be obtained as

[0054] Step 7: Determine the water flow resistance coefficient of the rigid vegetation in the main trough area

[0055] For rigid vegetation with many branches, after introducing the above volume correction coefficient α, the water flow resistance of a single rigid vegetation can be expressed as Where C a is the water flow resistance coefficient of the rigid vegetation in the slope area, ρ is the fluid density, and the other parameters are defined as before. Assuming the bed surface is smooth, the force balance of the entire water body in the vegetation area can be calculated as follows: Where L is the length of the vegetation area, which can be measured through indoor experiments. Then the average resistance coefficient of the prototype rigid vegetation on the slope is The calculation formula for the resistance coefficient expressed in terms of the average hydraulic radius described in step 6 is:

[0056] like Figure 2 This is the test model diagram of this application, and the specific steps of the embodiment are as follows:

[0057] Step 1: First, select a typical branched rigid plant from the lower Yangtze River plain as the prototype test object, trim the plant to ensure that the length of the branches is as consistent as possible, measure the stem diameter d of the experimental object, and calculate the horizontal cross-sectional area A. d It should be noted that in order to conduct comparative tests, smooth cylindrical rods with the same stem diameter and height should be selected as control test objects. Secondly, the longitudinal and transverse stem center distances of adjacent rigid vegetation in the indoor open channel water tank and the number of vegetation on the unit bed surface were measured and recorded as S1, S2 and N respectively. The distribution density β of branched rigid vegetation is calculated.

[0058] Step 2: First, in the open channel flume, measure the width B of the test flume, the bottom slope θ, and the corresponding gradient J. Next, measure the submerged volume W of the prototype plant at the corresponding water depth. Similarly, measure the submerged volume W of the control test object at the same water depth. a In addition, the average flow velocity V of the prototype test object observation section is obtained through the water tank test. The volume correction coefficient α of branching rigid vegetation is calculated.

[0059] Step 3: Based on the experimentally measured vegetation height h m 、The maximum water depth is h max and the slope angle θ, we can get the bottom elevation z of the i-th plant i =iS2tanθ.

[0060] Step 4: Based on the results of steps 1 to 3 above and the measured parameter data, define the number of rows of flooded vegetation p and the number of rows of completely flooded vegetation q, respectively. Calculate the average submerged depth of branching rigid vegetation in slope areas

[0061] Step 5: Based on the results of steps 1 to 4 above and the average flow velocity V of the section where the branched rigid vegetation is located, The corresponding average flow velocity V between vegetation stems can be obtained v .

[0062] Step 6: Based on the results of steps 1 to 5 above and the measured parameter data, The corresponding average flow velocity r between vegetation stems can be obtained v .

[0063] Step 7: Based on the results of steps 1 to 6 above and the measured vegetation area length L, The corresponding average flow velocity between vegetation stems can be obtained In the past, different scholars obtained the fitting formula C of the water flow resistance coefficient of rigid vegetation in slope area through research data. d =21.48exp(-8.657Re v ×10 -5 )+1.187exp(-2.04Re v ×10 -7 ), with accuracy, the calculation results obtained in this application are compared with the calculation results obtained by the above fitting formula, and the fitting curve is drawn as shown Figure 3 shown.

[0064] The embodiment of the present application provides a system for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging processing, including:

[0065] Correction coefficient determination module, used to determine the volume correction coefficient of rigid vegetation in the slope area;

[0066] Rigid vegetation area density calculation module, used to determine the rigid vegetation area density in the slope area;

[0067] Bottom elevation calculation module, used to determine the bottom elevation of any rigid vegetation in the slope area;

[0068] Average inundation depth calculation module, used to determine the average inundation depth of rigid vegetation in slope areas;

[0069] Average flow velocity calculation module, used to determine the average flow velocity between the main stems of rigid vegetation in the slope area;

[0070] Hydraulic radius calculation module, used to determine the hydraulic radius of rigid vegetation in slope areas;

[0071] The water flow resistance coefficient calculation module is used to determine the water flow resistance coefficient of rigid vegetation in the slope area.

[0072] An embodiment of the present application provides a computer-readable storage medium storing program code. When the program code is executed by a processor, the steps of the method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging are implemented as described above.

[0073] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0074] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0075] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0076] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0077] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0078] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0079] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0080] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for calculating the water flow resistance of branched rigid vegetation in slope areas by averaging, characterized in that: The following steps are involved: Step 1: Determine the volume correction coefficient of rigid vegetation in the slope area; Step 2: Determine the rigid vegetation area density in the slope area; Step 3: Determine the bottom elevation of any rigid vegetation in the slope area; Step 4: Determine the average inundation depth of rigid vegetation in the slope area; Step 5: Determine the average flow velocity between the main stems of rigid vegetation in the slope area; Step 6: Determine the hydraulic radius of the rigid vegetation in the slope area; Step 7: Determine the water flow resistance coefficient of the rigid vegetation in the slope area; The determination of the average flow velocity between the main stems of the rigid vegetation in the slope area is carried out by using an averaging method due to the existence of the slope. For the water body on the unit horizontal bed surface, the average depth is half of the maximum water depth, that is, , for water flow area According to the subtraction of the cross-sectional area and the effective water-blocking area of ​​vegetation, the flow area of ​​water per unit bed surface is obtained. , where is the width of the main slot area, is the flooding depth of the vegetation, which is measured through indoor experiments. The average flow velocity between the main stems of rigid vegetation is , where is the average flow velocity in the section where the rigid vegetation is located. The actual flow area of ​​the water flow is measured through indoor experiments. , then the average flow velocity between vegetation stems is .

2. The method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging according to claim 1, characterized in that: The above-mentioned correction coefficient for the volume of rigid vegetation in the slope area is as follows: for a single rigid vegetation with many branches, the actual water blocking area is and the water blocking area of ​​the trunk There is a certain conversion relationship between them, and the volume correction coefficient of branched rigid vegetation is introduced. , then , represents the projection area of ​​a single rigid plant with many branches on the water surface, and the volume correction coefficient of branched rigid vegetation It is expressed as the ratio of the volume of vegetation to the volume of a cylindrical rod with the same diameter under the same flooding conditions, which is , where is the volume of rigid vegetation flooded under a certain flooding depth; is the flooded volume of the cylindrical rod under the same flooding depth conditions, and All the results are calculated through indoor experimental measurements.

3. The method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging as claimed in claim 2, characterized in that: The specific method of determining the rigid vegetation area density in the slope area is as follows: It represents the area occupied by rigid vegetation stems on the unit bed surface. For a rectangular uniformly distributed vegetation array, the density is given by To calculate, where: and Represents the vertical and horizontal center distances of adjacent vegetation stems, It is the horizontal cross-sectional area of ​​a single plant, measured through indoor experiments.

4. The method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging as claimed in claim 3, characterized in that: The method of determining the bottom elevation of any rigid vegetation in the slope area is as follows: for a uniformly distributed vegetation array, the vegetation height is defined as , the maximum water depth is , obtained through indoor experimental measurement, it is believed that the elevation at the foot of the slope is =0, the vegetation elevation on the top of the slope is , n is the number of vegetation rows, the elevation difference between adjacent plants on the same section , is the slope angle. For a uniformly distributed vegetation array, starting from the lowest elevation, Bottom elevation of vegetation ,like If the vegetation is flooded, there will be ,Right now , where the slope foot is obtained through indoor experimental measurement.

5. The method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging as claimed in claim 4, characterized in that: The specific method for determining the average submerged depth of rigid vegetation in the slope area is: The vegetation at the site is divided into (1) elevation according to the flooding situation If the vegetation is not flooded, ; (2) Elevation If the vegetation is partially flooded, ; (3) Elevation If the vegetation is completely flooded, ,definition is the number of rows of flooded vegetation, then and The largest integer if If all vegetation in the area is submerged, ,definition is the number of rows of vegetation that are completely submerged, To satisfy and The maximum positive integer, according to the above and The total submerged depth of vegetation is , we can know the average submerged depth of vegetation .

6. The method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging as claimed in claim 5, characterized in that: The specific method for determining the hydraulic radius of rigid vegetation in the slope area is: for plants with uniform rectangular distribution, the average volume of fluid per unit horizontal bed surface is In this case, the unit bed surface should be the unit horizontal bed surface, not the unit bed surface on the actual slope. The vegetation water blocking area is taken as the projection area along the direction of water flow. For the vegetation array on the slope, the average water blocking area of ​​the vegetation on the unit horizontal bed surface is , we can get the average hydraulic radius of the vegetation unit horizontal plane on the slope as .

7. The method for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging processing according to claim 6, characterized in that: The specific method for determining the water flow resistance coefficient of the rigid vegetation in the slope area is to introduce a volume correction coefficient for the rigid vegetation with more branches: Then, the flow resistance of a single rigid plant can be expressed as , where is the water flow resistance coefficient of the rigid vegetation in the slope area, is the fluid density. Assuming the bed surface is smooth, the force balance of the entire water body in the vegetation area can be calculated as follows: ,in, is the length of the vegetation area, which is obtained through indoor experimental measurements. The average resistance coefficient of the prototype rigid vegetation on the slope is The calculation formula of resistance coefficient expressed in terms of average hydraulic radius is: .

8. A system for calculating the water flow resistance of branching rigid vegetation in a slope area by averaging processing, for implementing the method according to any one of claims 1 to 7, characterized in that: include, Correction coefficient determination module, used to determine the volume correction coefficient of rigid vegetation in the slope area; Rigid vegetation area density calculation module, used to determine the rigid vegetation area density in the slope area; Bottom elevation calculation module, used to determine the bottom elevation of any rigid vegetation in the slope area; Average inundation depth calculation module, used to determine the average inundation depth of rigid vegetation in slope areas; Average flow velocity calculation module, used to determine the average flow velocity between the main stems of rigid vegetation in the slope area; Hydraulic radius calculation module, used to determine the hydraulic radius of rigid vegetation in slope areas; The water flow resistance coefficient calculation module is used to determine the water flow resistance coefficient of rigid vegetation in the slope area.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores program codes, and when the program codes are executed by the processor, the steps of the method for calculating the water flow resistance of branched rigid vegetation in a slope area by averaging processing as described in any one of claims 1 to 7 are implemented.

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