Method and apparatus for calculating the surge amplitude of diverted channels

Abstract

This application discloses a method and apparatus for calculating the wave amplitude of swells in a bifurcation channel. The method involves acquiring the swell wave before it splits at the bifurcation point; forming an initial swell waveform by simplifying and fitting the swell wave before the bifurcation point; decomposing and discretizing the initial swell waveform into independent swell waves; calculating the amplitude of the independent swell waves at the bifurcation point at time t1 before collision and reflection during the split based on the initial swell waveform and the initial height of the independent swell waves; obtaining the position of each independent swell wave at time t2 after collision and reflection based on the movement and reflection path of each independent swell wave within the bifurcation point; superimposing the amplitudes of the independent swell waves at the same position at time t2 to obtain the superimposed amplitude of the independent swell waves; and determining the superimposed amplitude that meets preset conditions as the wave amplitude in the bifurcation channel. This provides a method for calculating the wave amplitude in a bifurcation channel.

Description

Technical Field

[0001] This application relates to the field of surge amplitude technology, specifically to a method and apparatus for calculating surge amplitude in a branched river channel. Background Technology

[0002] The surge formula calculation system is the fastest way to evaluate surge hazards. Existing research shows that when surges generated by riverbank landslides propagate in a single river channel, they can be subdivided into circular propagation and parallel propagation processes. The circular propagation area can be roughly defined as a ring-shaped area with the landslide entry point as the center and the river channel width as the radius, while the parallel propagation area is the remaining area affected by the surge, with a larger area and range.

[0003] During its propagation, the surge encounters river forks, which split the surge, thus changing its propagation direction and amplitude.

[0004] Most existing surge calculation methods only apply to a single river channel and simplify surge waves to a constant flow. They do not consider the impact of surge splitting on surge amplitude calculation, and cannot accurately calculate the waveform changes before and after surge splitting, nor can they calculate the surge amplitude at the bifurcation location. Summary of the Invention

[0005] This application proposes a method and apparatus for calculating the surge amplitude of a bifurcation channel, in order to solve the problem that the existing technology cannot calculate the surge amplitude at the bifurcation point.

[0006] The first aspect of this application provides a method for calculating the surge amplitude of a braided river channel, including:

[0007] Acquire the swell wave before it splits at the fork of a bifurcation channel;

[0008] An initial surge waveform is formed by simplifying and fitting the surge wave before the flow splits at the branch outlet;

[0009] The initial surge waveform is decomposed and discretized into a preset number of independent surge waves with the same wavelength but different initial positions in a direction perpendicular to the original propagation direction of the surge wave;

[0010] Based on the initial surge waveform and the initial height of the independent surge wave, the amplitude of the independent surge wave at the bifurcation point at time t1 before the collision reflection occurs during the diversion process is calculated.

[0011] The motion and reflection path of each independent surge wave within the branching point are calculated and obtained, and the position of the independent surge wave at time t2 after the collision and reflection is obtained, wherein time t2 is after time t1 in chronological order;

[0012] The amplitudes of the independent surge waves at the same location at time t2 are superimposed to obtain the superimposed amplitude of the independent surge waves, wherein the amplitude of the independent surge wave at time t2 is determined based on the amplitude of the independent surge wave at time t1.

[0013] The superimposed wave amplitude that meets the preset conditions is determined as the wave amplitude of the swell in the bifurcation channel.

[0014] In conjunction with the first aspect of the embodiments of this application, in some optional embodiments, obtaining the surge wave before the divergence at the bifurcation of the bifurcation channel includes:

[0015] Obtain information on the location of the surge;

[0016] Based on the instability mode of the landslide body, the corresponding calculation formula is selected to calculate and determine the initial wave amplitude of the surge at the location where the surge occurs.

[0017] Based on the initial amplitude of the surge, the distance between the location of the surge and the bifurcation, and the generalized model of the bifurcation channel, the surge wave before the bifurcation of the bifurcation channel is determined.

[0018] In conjunction with the first aspect of the embodiments of this application, in some optional embodiments, the step of forming an initial surge waveform by simplifying and fitting the surge wave before the diversion point includes:

[0019] The initial surge waveform is formed by simplifying and fitting the surge wave before the branching point according to the waveform equation. The waveform equation includes: Fourier series equation and cosine wave equation.

[0020] In conjunction with the first aspect of the embodiments of this application, in some optional embodiments, the calculation of the amplitude of the independent surge wave at the bifurcation position at time t1 before collision reflection during the diversion process, based on the initial surge waveform and the initial height of the independent surge wave, includes:

[0021] according to Calculate the amplitude of the independent surge wave at the bifurcation point at time t1 before collision reflection during the flow splitting process. c ( i )( i = 1,2,3...), where, The initial height of each individual surge wave, x l This refers to the extent of the surge's reach in the direction of the diversion process. S 0 represents the riverbed slope, and g represents the acceleration due to gravity.

[0022] In conjunction with the first aspect of the embodiments of this application, in some optional embodiments, the calculation of the motion and reflection path of each independent surge wave within the diversion channel includes:

[0023] The propagation direction of the surge in the original propagation channel is defined as the y-direction, and the propagation direction of the surge in the bifurcation channel is defined as the x-direction. A computational grid is established for the location of the bifurcation mouth of the bifurcation channel based on the width of the original propagation channel and the width of the bifurcation channel.

[0024] Based on the computational grid and the principle of specular reflection, the motion and reflection path of each independent surge wave within the branching point are calculated.

[0025] In conjunction with the first aspect of the embodiments of this application, in some optional embodiments, determining the superimposed wave amplitude that meets preset conditions as the wave amplitude of the swell in the bifurcation channel includes:

[0026] The maximum superimposed wave amplitude at the centerline position within the bifurcation channel is defined as the wave amplitude of the swell within the bifurcation channel.

[0027] In conjunction with the first aspect of the embodiments of this application, in some optional embodiments, it further includes:

[0028] The extent of the impact of the surge on the river channel and the degree of damage are determined based on the surge amplitude in the identified branching channels.

[0029] A second aspect of this application provides a device for calculating the surge amplitude of a braided river channel, comprising:

[0030] The first acquisition module is used to acquire the swell wave before it splits at the confluence of the bifurcation of the river channel;

[0031] A forming module is used to form an initial surge waveform by simplifying and fitting the surge wave before the flow split at the branch outlet;

[0032] The decomposition and discretization module is used to decompose and discretize the initial surge waveform into a preset number of independent surge waves with the same wavelength but different initial positions in a direction perpendicular to the original propagation direction of the surge wave.

[0033] The first calculation module is used to calculate the amplitude of the independent surge wave at the bifurcation position at time t1 before the collision reflection occurs during the diversion process, based on the initial surge waveform and the initial height of the independent surge wave.

[0034] The second calculation module is used to calculate and obtain the motion and reflection path of each independent surge wave in the branching point, and to obtain the position of the independent surge wave at time t2 after the collision and reflection, wherein time t2 is after time t1 in time sequence;

[0035] The second acquisition module is used to superimpose the amplitudes of independent surge waves at the same location at time t2 to obtain the superimposed amplitude of the independent surge waves, wherein the amplitude of the independent surge wave at time t2 is determined based on the amplitude of the independent surge wave at time t1.

[0036] The determination module is used to determine the superimposed wave amplitude that meets preset conditions as the wave amplitude of the swell in the bifurcation channel.

[0037] A third aspect of this application also provides an electronic device, including: a processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, it implements the steps of the method for calculating the surge amplitude of a branched river channel as described in the above-described embodiments of this application.

[0038] A fourth aspect of this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for calculating the surge amplitude of a branched river channel as described in the above-described embodiments of this application.

[0039] The beneficial effects of the technical solutions provided in this application include at least the following:

[0040] In this embodiment of the invention, the surge wave before the flow splits at the bifurcation of a river channel is obtained; an initial surge wave waveform is formed by simplifying and fitting the surge wave before the flow splits at the bifurcation; the initial surge wave waveform is decomposed and discretized into a preset number of independent surge waves with the same wavelength but different initial positions in a direction perpendicular to the original propagation direction of the surge wave; based on the initial surge wave waveform and the initial height of the independent surge waves, the amplitude of the independent surge waves at the bifurcation position at time t1 before the collision and reflection occurs during the flow split is calculated; the motion and reflection path of each independent surge wave in the bifurcation are calculated and obtained, and the position of the independent surge waves at time t2 after the collision and reflection occurs is obtained, where time t2 is after time t1 in time sequence; the amplitudes of the independent surge waves at the same position at time t2 are superimposed to obtain the superimposed amplitude of the independent surge waves, wherein the amplitude of the independent surge waves at time t2 is determined based on the amplitude of the independent surge waves at time t1; the superimposed amplitude that meets the preset conditions is determined as the amplitude of the surge wave in the bifurcation channel. This provides a method for calculating the wave amplitude of swells in bifurcation channels. This method takes into account the waveform characteristics of swells and can accurately solve the waveform and amplitude of swells after they split in bifurcation channels, providing a technical guarantee for more accurate evaluation of swell disasters. Attached Figure Description

[0041] Figure 1 A flowchart illustrating the method for calculating surge amplitude in a braided river channel provided in this application embodiment. Figure 1 ;

[0042] Figure 2A schematic diagram illustrating the fitting and discretization of the surge waveform when the surge wave propagates to the bifurcation point in the surge wave amplitude calculation method provided in this application embodiment;

[0043] Figure 3 A schematic diagram of the surge wave amplitude calculation method for the bifurcation channel provided in this application at time t1 after the surge wave enters the bifurcation mouth;

[0044] Figure 4 A schematic diagram showing the wave amplitude calculation results at different times during the diversion movement of the swell at the diversion mouth in the wave amplitude calculation method of the diversion channel provided in the embodiments of this application;

[0045] Figure 5 A schematic diagram illustrating a practical application of the wave amplitude calculation method for bifurcation channels provided in this application.

[0046] Figure 6 A flowchart illustrating the method for calculating surge amplitude in a braided river channel provided in this application embodiment. Figure 2 . Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0048] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0049] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0050] The method for calculating the surge amplitude of a branched river channel provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0051] like Figure 1 As shown, the specific method for calculating the surge amplitude of the bifurcation channel may include:

[0052] Step 101: Obtain the surge wave before the swell splits at the confluence of the bifurcation in the river channel.

[0053] Surges are usually caused by the instability of landslide bodies, such as riverbank collapses or objects falling into the water. In order to accurately obtain the wave amplitude information of surges, the technical solution of this application selects corresponding calculation formulas, such as river channel generalization models, wave generation formulas, propagation wave formulas, and wave run-up formulas, according to the instability mode of landslide bodies, such as falling, toppling, and sliding, to calculate and determine the initial wave amplitude.

[0054] For example, for landslide swells, the maximum wave amplitude is determined using the following formula:

[0055]

[0056] Specific parameters include: landslide velocity v, gravitational acceleration g, and landslide entry angle into the water. a Original propagation channel width B0, landslide thickness s, landslide entry length l sw , water depth h w , width of landslide entering water w w The maximum surge amplitude is calculated using generalized parameters, and this maximum surge amplitude is determined as the initial surge amplitude at the location where the disaster surge occurs.

[0057] After obtaining the initial wave amplitude, the maximum wave amplitude of the surge generated by the instability of the landslide body entering the water is calculated based on the selected wave-generating formula and propagating wave formula. a max (i.e., the initial amplitude of the swell at the location where the swell occurs), and the amplitude of the swell before it propagates to the bifurcation point. a c0max .

[0058] Calculation formula for landslide surge propagation For example, the surge amplitude in front of the bifurcation is calculated using the distance l from the landslide location to the bifurcation and the water depth hw. a c0max .

[0059] Therefore, in the technical solution of this application, obtaining the surge wave before the divergence at the bifurcation of the river channel can specifically include:

[0060] Obtain information on the location of the surge;

[0061] Based on the instability mode of the landslide body, the corresponding calculation formula is selected to calculate and determine the initial wave amplitude of the surge at the location where the surge occurs.

[0062] Based on the initial wave amplitude, the distance between the wave occurrence location and the bifurcation, and the generalized model of the bifurcation channel, the wave wave before the bifurcation of the bifurcation channel is determined.

[0063] Step 102: The initial surge waveform is formed by simplifying and fitting the surge wave before the flow split at the branch outlet.

[0064] By considering the waveform characteristics of surge waves in this embodiment of the invention, the waveform and amplitude of surge waves after diversion in the bifurcation channel can be accurately calculated, overcoming the technical deficiency of lacking surge wave waveform research in the prior art. At the same time, it meets the surge wave calculation requirements of the surge wave diversion calculation method in this patent, providing important technical support for surge wave prediction and disaster prevention and mitigation in complex rivers such as reservoir areas.

[0065] Specifically, the swell wave before the bifurcation can be simplified and fitted using waveform equations such as Fourier series or cosine wave to form the initial swell wave waveform.

[0066] In one specific embodiment, the wavelength of the surge wave needs to be determined during the fitting process. l It is much wider than the branching channel width B.

[0067] In another specific embodiment, the simplified maximum amplitude of the surge wave can be compared with the amplitude of the surge wave before the bifurcation. a c0max equal.

[0068] Step 103: Decompose the initial surge waveform into a preset number of independent surge waves with the same wavelength but different initial positions in a direction perpendicular to the original propagation direction of the surge.

[0069] Specifically, the simplified initial surge waveform before the split is decomposed and discretized into 100 waveforms with the same wavelength perpendicular to the original propagation direction of the surge. l / 100, and independent surge waves with different initial positions, each with an initial height of . c0 (i) In a specific embodiment, the maximum amplitude of all independent surge waves can be: a c0max .

[0070] The schematic diagram of the wave waveform fitting and discretization process when the wave propagates to the bifurcation point in the wave amplitude calculation method of the bifurcation channel provided in this application embodiment can be seen as follows: Figure 2 As shown.

[0071] Step 104: Based on the initial surge waveform and the initial height of the independent surge wave, calculate the amplitude of the independent surge wave at the bifurcation point at time t1 before the collision reflection occurs during the diversion process.

[0072] In this step, the specific details can be determined according to... Calculate the amplitude of the independent surge wave at the bifurcation point at time t1 before collision reflection during the flow splitting process. c ( i )( i = 1,2,3...), where, The initial height of each individual surge wave, x l This refers to the extent of the surge's reach in the direction of the diversion process. S 0 represents the riverbed slope, and g represents the acceleration due to gravity.

[0073] The schematic diagram of the surge amplitude calculation method for bifurcation channels provided in this application at time t1 after the surge enters the bifurcation is shown in the following embodiment. Figure 3 As shown.

[0074] Step 105: Calculate and obtain the motion and reflection path of each independent surge wave within the branching point, and obtain the position (x, y) of the independent surge wave at time t2 after the collision and reflection.

[0075] The original propagation direction of the surge wave is defined as the y-direction, and the direction in which it deflects and splits is defined as the x-direction. A computational grid is established at the location of the bifurcation of the bifurcation channel, with a grid size of original channel width B0 / 100 × bifurcation channel width B / 100. Based on the computational grid and the principle of specular reflection, the motion and reflection path of each independent surge wave within the bifurcation are calculated. The time t2 mentioned above is after time t1 in chronological order.

[0076] In other embodiments, the grid size can also be established according to other specific parameters.

[0077] The position y0 of the independent surge wave at time t2 after entering the branching channel can be calculated using y0 = v0t0, where v0 is the surge wave velocity before the branching channel, and t is the surge wave velocity before the branching channel. o This represents the time it takes for the surge wave to propagate at the confluence.

[0078] The wave amplitude calculation results of the surge in the bifurcation channel at different times during the diversion process provided in the embodiments of this application can be as follows: Figure 4 As shown.

[0079] Step 106: Superimpose the amplitudes of the independent surge waves at the same location at time t2 to obtain the superimposed amplitude of the independent surge waves, wherein the amplitude of the independent surge wave at time t2 is determined based on the amplitude of the independent surge wave at time t1.

[0080] Based on the location information in the computational grid, the amplitudes of independent surge waves at the same location at time t2 are superimposed to obtain the superimposed amplitude of the independent surge waves.

[0081] The amplitude of the independent surge wave at time t2 can be determined based on the amplitude of the independent surge wave at time t1 before the surge collision and reflection.

[0082] For example, the amplitude of the independent surge wave at time t2 can be directly determined as the amplitude of the independent surge wave at time t1 before the surge collision and reflection;

[0083] Alternatively, the amplitude of the independent surge wave at time t2 can be determined based on the amplitude of the independent surge wave at time t1 before the surge wave collision and reflection, or other mature and feasible methods such as corresponding attenuation standards and practical experience. This application does not impose specific limitations on this.

[0084] Step 107: Determine the superimposed wave amplitude that meets the preset conditions as the wave amplitude of the swell in the bifurcation channel.

[0085] The maximum surge amplitude at the centerline of the branching channel can be used as the maximum surge amplitude during subsequent propagation. a c1 The maximum surge amplitude in all branch channels and the original propagation channel is calculated when the diversion is completed. Subscript 1 represents the branch channel number.

[0086] Alternatively, based on references such as the different degrees of damage corresponding to different surge amplitudes, surges with amplitudes higher than a preset height value can be defined as the surge amplitude in the bifurcation channel.

[0087] The wave amplitude calculation method for swells in bifurcation channels provided in the above embodiments of the present invention can accurately solve the waveform and amplitude of swells after they split in bifurcation channels by combining the waveform characteristics of swells, thus providing a guarantee for more accurate evaluation of swell disasters.

[0088] The wave amplitude calculation method for bifurcation channels provided in this invention can achieve significant technical effects in practical applications, for example, as... Figure 5 As shown (wave amplitude distribution of the surge generated by the Gongjiafang landslide at the confluence of the Yangtze River and the Daning River), based on the technical solution of this application, the surge of the Gongjiafang landslide that occurred in Wushan was calculated. The calculated surge amplitude at the confluence of the Daning River and the Yangtze River in Wushan County was 0.36 m, which is only 10% different from the actual survey result of 0.4 m.

[0089] In another specific embodiment, such as Figure 6 As shown, the technical solution of this application also includes:

[0090] Step 108: Determine the extent of the impact of the surge on the river channel and the degree of damage based on the determined surge amplitude in the bifurcation channel.

[0091] Specifically, after the surge is diverted, assuming that the attenuation of the surge during its subsequent propagation still follows the propagation attenuation law within a single river channel, a c1 replace a max Substitute return Calculations are performed to obtain the surge amplitude during subsequent propagation, where... l This is the distance from the calculated point along the river to the landslide.

[0092] Obtain the wave amplitude distribution across the entire river channel affected by the swell, and calculate the swell run-up R at all locations along the bank using the swell run-up formula. For example, based on the wave amplitude 'a' at the corresponding location in the river channel c ( l ), bank slope inclination angle β Calculate the wave height along the swell path.

[0093] After determining the maximum surge amplitude, this invention can solve for the propagation attenuation of the surge based on the actual river conditions using appropriate methods. It can calculate the impact of the surge on falling rocks or landslides using surge attenuation prediction models for laterally confined and unconfined propagation zones, and classify the surge intensity within the region. For example, surge heights A>2m, 2m>A>1.5m, 1.5m>4>1m, 1m>A>0.5m, and A≤0.5m are respectively defined as "extremely high surge zone," "very high surge zone," "high surge zone," "medium surge zone," and "low surge zone." Based on these surge zones, the impact range and damage level of the surge on the river channel are determined.

[0094] The wave amplitude calculation method for bifurcation channels provided in this embodiment can provide important technical support for wave prediction and disaster prevention and mitigation in complex waterways such as reservoir areas.

[0095] This application also provides a device for calculating the surge amplitude of a braided river channel, including:

[0096] The first acquisition module is used to acquire the swell wave before it splits at the confluence of the bifurcation of the river channel;

[0097] A forming module is used to form an initial surge waveform by simplifying and fitting the surge wave before the flow split at the branch outlet;

[0098] The decomposition and discretization module is used to decompose and discretize the initial surge waveform into a preset number of independent surge waves with the same wavelength but different initial positions in a direction perpendicular to the original propagation direction of the surge wave.

[0099] The first calculation module is used to calculate the amplitude of the independent surge wave at the bifurcation position at time t1 before the collision reflection occurs during the diversion process, based on the initial surge waveform and the initial height of the independent surge wave.

[0100] The second calculation module is used to calculate and obtain the motion and reflection path of each independent surge wave in the branching point, and to obtain the position (x, y) of the independent surge wave at time t2 after the collision and reflection, wherein time t2 is after time t1 in time sequence;

[0101] The second acquisition module is used to superimpose the amplitudes of independent surge waves at the same location at time t2 to obtain the superimposed amplitude of the independent surge waves, wherein the amplitude of the independent surge wave at time t2 is determined based on the amplitude of the independent surge wave at time t1.

[0102] The determination module is used to determine the superimposed wave amplitude that meets preset conditions as the wave amplitude of the swell in the bifurcation channel.

[0103] The wave amplitude calculation device for the bifurcation channel provided in this application embodiment has the same technical process and effect as the wave amplitude calculation method for the bifurcation channel provided in the above-mentioned application embodiment, and will not be repeated here.

[0104] This application also provides an electronic device, including a processor, storage, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, it implements the various processes of the above-described embodiments of the method for calculating the surge amplitude of the branched river channel, and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0105] This application also provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the various processes of the above-described embodiments of the method for calculating the surge amplitude of bifurcation channels, achieving the same technical effects. To avoid repetition, it will not be described again here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0106] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0107] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0108] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A method for calculating the surge amplitude of a braided river channel, characterized in that, include: Acquire the swell wave before it splits at the fork of a bifurcation channel; An initial surge waveform is formed by simplifying and fitting the surge wave before the flow splits at the branch outlet; The initial surge waveform is decomposed and discretized into a preset number of independent surge waves with the same wavelength but different initial positions in a direction perpendicular to the original propagation direction of the surge wave; Based on the initial surge waveform and the initial height of the independent surge wave, the amplitude of the independent surge wave at the bifurcation point at time t1 before the collision reflection occurs during the diversion process is calculated. The motion and reflection path of each independent surge wave within the branching point are calculated and obtained, and the position of the independent surge wave at time t2 after the collision and reflection is obtained, wherein time t2 is after time t1 in chronological order; The amplitudes of the independent surge waves at the same location at time t2 are superimposed to obtain the superimposed amplitude of the independent surge waves, wherein the amplitude of the independent surge wave at time t2 is determined based on the amplitude of the independent surge wave at time t1. The superimposed wave amplitude that meets the preset conditions is determined as the wave amplitude of the swell in the bifurcation channel.

2. The method for calculating the surge amplitude of a braided river channel according to claim 1, characterized in that, The acquisition of swell waves before the divergence at the confluence of the river channels includes: Obtain information on the location of the surge; Based on the instability mode of the landslide body, the corresponding calculation formula is selected to calculate and determine the initial wave amplitude of the surge at the location where the surge occurs. Based on the initial amplitude of the surge, the distance between the location of the surge and the bifurcation, and the generalized model of the bifurcation channel, the surge wave before the bifurcation of the bifurcation channel is determined.

3. The method for calculating the surge amplitude of a braided river channel according to claim 1, characterized in that, The process of simplifying and fitting the surge wave before the flow split at the branch outlet to form the initial surge wave waveform includes: The initial surge waveform is formed by simplifying and fitting the surge wave before the diversion at the branch outlet according to the waveform equation. The waveform equation includes: Fourier series equation and cosine wave equation.

4. The method for calculating the surge amplitude of a braided river channel according to claim 1, characterized in that, The calculation of the amplitude of the independent surge wave at the bifurcation point at time t1 before collision reflection during the diversion process, based on the initial surge waveform and the initial height of the independent surge wave, includes: according to Calculate the amplitude of the independent surge wave at the bifurcation point at time t1 before collision reflection during the flow splitting process. c ( i )( i = 1,2,3...), where, The initial height of each individual surge wave, x l This refers to the extent of the surge's reach in the direction of the diversion process. S 0 represents the riverbed slope, and g represents the acceleration due to gravity.

5. The method for calculating the surge amplitude of a braided river channel according to claim 1, characterized in that, The calculation to obtain the motion and reflection path of each independent surge wave within the subduction zone includes: The propagation direction of the surge in the original propagation channel is defined as the y-direction, and the propagation direction of the surge in the bifurcation channel is defined as the x-direction. A computational grid is established for the location of the bifurcation mouth of the bifurcation channel based on the width of the original propagation channel and the width of the bifurcation channel. Based on the computational grid and the principle of specular reflection, the motion and reflection path of each independent surge wave within the branching point are calculated.

6. The method for calculating the surge amplitude of a braided river channel according to claim 1, characterized in that, The step of determining the superimposed wave amplitude that meets the preset conditions as the wave amplitude of the swell in the bifurcation channel includes: The maximum superimposed wave amplitude at the centerline position within the bifurcation channel is defined as the wave amplitude of the swell within the bifurcation channel.

7. The method for calculating the surge amplitude of a braided river channel according to claim 1 or 6, characterized in that, The method further includes: The extent of the impact of the surge on the river channel and the degree of damage are determined based on the surge amplitude in the identified branching channels.

8. A device for calculating the surge amplitude of a braided river channel, characterized in that, include: The first acquisition module is used to acquire the swell wave before it splits at the confluence of the bifurcation of the river channel; A forming module is used to form an initial surge waveform by simplifying and fitting the surge wave before the flow split at the branch outlet; The decomposition and discretization module is used to decompose and discretize the initial surge waveform into a preset number of independent surge waves with the same wavelength but different initial positions in a direction perpendicular to the original propagation direction of the surge wave. The first calculation module is used to calculate the amplitude of the independent surge wave at the bifurcation position at time t1 before the collision reflection occurs during the diversion process, based on the initial surge waveform and the initial height of the independent surge wave. The second calculation module is used to calculate and obtain the motion and reflection path of each independent surge wave in the branching point, and to obtain the position of the independent surge wave at time t2 after the collision and reflection, wherein time t2 is after time t1 in time sequence; The second acquisition module is used to superimpose the amplitudes of independent surge waves at the same location at time t2 to obtain the superimposed amplitude of the independent surge waves, wherein the amplitude of the independent surge wave at time t2 is determined based on the amplitude of the independent surge wave at time t1. The determination module is used to determine the superimposed wave amplitude that meets preset conditions as the wave amplitude of the swell in the bifurcation channel.

9. An electronic device, characterized in that, include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the steps of the method for calculating the surge amplitude of a bifurcation channel 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 that, when executed by a processor, implements the steps of the method for calculating the surge amplitude of a bifurcation channel as described in any one of claims 1 to 7.

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