A method for detecting the position of a lost root stone of a dam based on floating inversion

Abstract

The application discloses a kind of embankment lost root stone position detection methods based on floating inversion, comprising: by constructing vertical suspension experimental model, obtain PU high polymer as the suspension velocity of lost root stone under the action of water flow and the flow resistance coefficient, by constructing dike flume model, obtain the upfloat point coordinate of the lost root stone under the action of water flow, water flow velocity, water depth and inflow angle;Based on mechanical equilibrium equation, establish the floating inversion theory mathematical model using lost root stone;Determine a plurality of correction coefficients based on floating inversion theory mathematical model, so as to determine the correction coefficient of floating inversion mathematical model;Based on correction coefficient, the relationship between the flow resistance coefficient and the root stone floating body shape, the floating body shape of embankment lost root stone, water depth, water flow velocity, water density, the density of embankment lost root stone and inflow angle construct floating inversion mathematical model;Determine the position of embankment lost root stone according to floating inversion mathematical model.The application can accurately determine the position of embankment lost root stone.

Description

Technical Field

[0001] This invention belongs to the field of foundation stone location monitoring technology, specifically relating to a method for detecting the location of lost foundation stones in dams based on float-inversion. Background Technology

[0002] River regulation projects are an important part of the Yellow River flood control project. They rely on foundation stones to resist floods, but foundation stones are easily moved or even lost due to the impact of water flow. Once foundation stones are lost, the flood control effect of the project will be greatly reduced. Summary of the Invention

[0003] The purpose of this invention is to provide a method for detecting the location of lost foundation stones in dams based on float-inversion, in order to solve the above-mentioned problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention also provides a method for detecting the location of lost foundation stones in a dam, comprising:

[0006] By constructing a vertical suspension experimental model, the suspension velocity and flow resistance coefficient of PU polymer as a lost root stone under the action of water flow were obtained, and the correlation between the flow resistance coefficient and the shape of the root stone float was constructed.

[0007] By constructing a groyne flume model, the water flow velocity, water depth, and incoming flow angle are obtained, as well as the coordinates of the floating point of the PU polymer as the lost root stone under the action of water flow are obtained.

[0008] Based on the aforementioned suspension velocity, flow resistance coefficient, floating point coordinates, and mechanical equilibrium equations under the action of water flow, a theoretical mathematical model for float-off inversion using PU polymer as a root rock is established.

[0009] Based on the floating inversion theory mathematical model, several correction coefficients are determined to correct the theoretical correction coefficients of the floating inversion theory mathematical model, thereby determining the correction coefficients of the floating inversion mathematical model.

[0010] Based on the correction coefficient, water depth, water flow velocity, water density, the correlation between the flow resistance coefficient and the shape of the floating body of the foundation stone, the floating body shape of the foundation stone lost by the dam, the density of the foundation stone lost by the dam, and the incoming flow angle, a floating inversion mathematical model is constructed.

[0011] The location of the lost foundation stones of the dam is determined based on the floating inversion mathematical model.

[0012] In some embodiments, the following formulas (1) and (2) are used to determine the mathematical model of the floating inversion theory;

[0013]

[0014]

[0015] In equations (1) and (2) above, (x0, y0) are the coordinates of the lost point actually measured by the PU polymer as the lost root stone, (x, y) are the coordinates of the floating point of the PU polymer as the lost root stone, and v x Let v be the velocity of the water flow in the x-direction. y Let H be the velocity of the water flow in the y-direction, H be the water depth, and C be the velocity of the water flow in the y-direction. d ρ is the drag coefficient around the flow, v is the flow velocity, and ρ is the flow velocity. 水 ρ is the density of water. 示 Let PU polymer be the density of the underwater root stone, α be the inflow angle, a be the side length of the underwater root stone, and v be the density of the PU polymer as the root stone. x v is the horizontal water flow velocity. y Let g be the vertical water flow velocity, and g be the acceleration due to gravity.

[0016] In some embodiments, the correction coefficients are determined based on the floating inversion theory mathematical model according to the following formulas (3) and (4):

[0017] βx=x0 / x (3)

[0018] βy=y0 / y′0 (4)

[0019] In equations (3) and (4) above, βx is the correction coefficient in the x direction, βy is the correction coefficient in the y direction, x0 is the x-coordinate of the actual lost point measured by PU polymer as the lost root stone, x is the x-coordinate of the floating point of PU polymer as the lost root stone, y0 is the y-coordinate of the actual lost point measured by PU polymer as the lost root stone, and y is the y-coordinate of the floating point of PU polymer as the lost root stone.

[0020] Several correction coefficients are obtained, and the theoretical correction coefficients of the floating inversion mathematical model are corrected based on these correction coefficients, thereby determining the correction coefficients of the floating inversion mathematical model.

[0021] In some embodiments, a groyne flume model is constructed, specifically as follows:

[0022] The glass water tank of the groyne model is 20m long, 3m wide, and 0.6m high, with a groyne of 2.3m in length and an angle of 30° with the shoreline.

[0023] In some embodiments, a vertical suspension experimental model is constructed, specifically as follows:

[0024] The vertical suspension experiment model is a suspension observation tube, which is 1.5m high, 250mm in diameter, and 1.3m deep in water. The bottom of the suspension observation tube is equipped with a strong magnetic clamp and a release mechanism.

[0025] In some embodiments, the method further includes:

[0026] Based on the vertical suspension experimental model, several flow resistance coefficients of PU polymers of different shapes as lost anchors were obtained, and several flow resistance coefficients, underwater anchor float shape and flow Reynolds number relationship curves were established based on the flow resistance coefficients.

[0027] In some embodiments, the floating inversion mathematical model is determined according to the following formulas (5) and (6):

[0028]

[0029]

[0030] In equations (5) and (6) above, (x s ′,y s (x′) represents the corrected coordinates of the point where the lost foundation stone of the dam was lost. 10 y 10 ) represents the coordinates of the point where the foundation stones of the dam were lost, β 1x and β 1y Here, H1 is the correction factor, and C is the water depth. d U is the drag coefficient, U0 is the settling velocity of the fluid, v is the flow velocity, α is the inflow angle, and A is the flow angle. d ρ is the projected area around the PU tracer. w ρ is the density of the river water. p Let Vp be the density of the lost foundation stone of the dam, Vp be the volume of the lost foundation stone of the dam, Δx be the displacement increment of the lost foundation stone of the dam in the x direction, Δy be the displacement increment of the lost foundation stone of the dam in the y direction, U0 be the settling velocity of the fluid, and g be the acceleration due to gravity.

[0031] In some embodiments, the method further includes:

[0032] The shape and side length of the PU polymer as a lost anchor or dam anchor are obtained by an image recognition device. The floating point position of the PU polymer as a lost anchor or dam anchor is obtained by converting the internal coordinate system established by the image monitor.

[0033] The present invention also provides a detection device for a method and device for detecting the location of lost foundation stones in dams based on float-inversion, the device comprising:

[0034] The first acquisition module is used to acquire the suspension velocity and flow resistance coefficient of PU polymer as a lost root stone under the action of water flow by constructing a vertical suspension experimental model, and to construct the correlation between the flow resistance coefficient and the shape of the root stone float.

[0035] The second acquisition module is used to acquire the water flow velocity, water depth and incoming angle by constructing a groyne water channel model, and to acquire the coordinates of the floating point of the PU polymer as the lost root stone under the action of water flow.

[0036] A module is established to build a theoretical mathematical model for buoyancy inversion using PU polymer as a root rock, based on the suspension velocity, flow resistance coefficient, floating point coordinates and mechanical equilibrium equations under the action of water flow.

[0037] The first determining module is used to determine a number of correction coefficients based on the floating inversion theory mathematical model, so as to correct the theoretical correction coefficients of the floating inversion theory mathematical model through the number of correction coefficients, thereby determining the correction coefficients of the floating inversion mathematical model.

[0038] A construction module is used to construct a floating inversion mathematical model based on the correction coefficient, water depth, water flow velocity, water density, the correlation between the flow resistance coefficient and the shape of the floating body of the root stone, the floating body shape of the root stone lost in the dam, the density of the root stone lost in the dam, and the incoming flow angle.

[0039] The second determining module is used to determine the location of the lost foundation stones of the dam based on the floating inversion mathematical model.

[0040] This invention provides a device for detecting the location of lost foundation stones in a dam based on float-inversion, comprising a memory, a processor, and a transceiver connected in sequence. The memory is used to store a computer program, the transceiver is used to send and receive messages, and the processor is used to read the computer program and execute any of the above-described possible methods for detecting the location of lost foundation stones in a dam.

[0041] Beneficial effects:

[0042] This invention establishes a buoyancy inversion mathematical model based on hydrodynamic principles, using PU polymer as a tracer for lost foundation stones. This model can be used to calculate the location of lost foundation stones in the dam area. Simultaneously, two auxiliary experimental devices using PU polymer as a tracer for lost foundation stones were designed. These devices can determine the key technical parameters and correction coefficients of lost foundation stones in river dams, enabling the accurate determination of underwater foundation stone loss locations using captured tracer and flow field information. Attached Figure Description

[0043] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0044] Figure 1 A flowchart illustrating a method for detecting the location of lost foundation stones in a dam based on float-inversion, provided in an embodiment of this application;

[0045] Figure 2 A schematic diagram of a desuspension and suspension test device provided in an embodiment of this application;

[0046] Figure 3 A graph showing the relationship between the drag coefficient, float shape, and Reynolds number of a PU tracer provided in this application embodiment;

[0047] Figure 4 A graph showing the relationship between the drag coefficient, float shape, and Reynolds number of a PU tracer is provided for embodiments of this application.

[0048] Figure 5 A groyne flume model layout diagram provided for an embodiment of this application;

[0049] Figure 6 A login interface diagram provided for an embodiment of this application;

[0050] Figure 7 A model integration user interface diagram provided in this application embodiment;

[0051] Figure 8 A schematic diagram of the structure of a dam lost foundation stone location detection device based on float-inversion provided in an embodiment of this application;

[0052] Figure 9 A schematic diagram of another dam displacement detection device based on float-inversion provided in this application embodiment. Attached image description:

[0054] 1. PU polymer, 2. With strong magnetic clip, 3. Iron block. Detailed Implementation

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0056] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of the invention.

[0057] It should be understood that the term "and / or" that may appear in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" that may appear in this document describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the related objects before and after it are in an "or" relationship.

[0058] Example 1:

[0059] like Figure 1 The diagram shows a flowchart of a method for detecting the location of lost foundation stones in a dam based on float-off inversion, as proposed in an embodiment of the present invention. The method includes:

[0060] S201, by constructing a vertical suspension experimental model, the suspension velocity and flow resistance coefficient of PU polymer as a lost root stone under the action of water flow are obtained, and the correlation between the flow resistance coefficient and the shape of the root stone float is constructed.

[0061] Specifically, the vertical suspension experimental model is a suspension observation tube, such as... Figure 2As shown, the suspended observation tube has a height H1 of 1.5m, a diameter D of 250mm, a water depth of 1.3m, H2 is the distance from the bottom of the tube to the water surface, and L is the height of the bottom support, which is 20cm. The bottom of the suspended observation tube is equipped with a strong magnetic clamp 2, an iron block 3, and a PU polymer 1. An escape suspension test can be conducted using the actual embedded PU polymer as a tracer for lost root stones. A PU body with a typical embedded shape is placed at the bottom of the suspended observation tube, fixed by the strong magnetic clamp and the iron block, and then released to conduct the escape suspension test of the actual embedded PU polymer as a tracer for lost root stones.

[0062] In order to determine the relationship between several flow resistance coefficients, the shape of the underwater root stone float, and the flow Reynolds number, in a preferred embodiment of this scheme, based on the vertical suspension experimental model, several flow resistance coefficients of PU polymers of different shapes are obtained as lost root stones, and a relationship curve between several flow resistance coefficients, the shape of the underwater root stone float, and the flow Reynolds number is established according to the several flow resistance coefficients.

[0063] Specifically, through detachment and suspension tests, the ascent time and floating trajectory of different types of submerged PU polymers as tracers of lost root stones were determined. Several suspension velocities and several flow resistance coefficients of different types of PU polymers as tracers of lost root stones were also determined. Based on these flow resistance coefficients, several curves relating the flow resistance coefficients, the shape of the underwater root stone float, and the flow Reynolds number were established. Figure 3 and Figure 4 As shown.

[0064] S202, by constructing a groyne flume model, the flow velocity, water depth, and incoming flow angle are obtained, as well as the coordinates of the floating point of the PU polymer as the lost root stone under the action of the water flow are obtained.

[0065] Specifically, such as Figure 5 As shown, the groyne model is a model groyne with three groynes. The sidewalls and bottom of the model groyne are made of transparent colorless glass. The glass groyne is 20m long (a), 3m wide, and 0.6m high. The downward-facing groyne L2 is 2.3m long and forms an angle of 30° with the shoreline. Below the groyne base stone platform, there are gravels (model base stones) with a diameter of 2-3cm. There is an inflow adjustment gate at the upstream head of the groyne and an outflow level adjustment gate at the downstream tail.

[0066] The constructed triple-dam model reflects common dam engineering forms in actual rivers and can demonstrate the influence of the upper and lower dams on the flow field of the main dam. Using the model flume, floating tests simulating river motion can be conducted to obtain the coordinates of the PU tracer floating to the water surface and the corresponding underwater root stone loss locations under different flow velocities and incoming flow angles. This yields a large amount of experimental data, which is used to verify the correction coefficients of the established floating inversion theoretical mathematical model. By constructing the groyne flume model, the coordinates of the floating point of the PU polymer as a lost root stone under the action of water flow are obtained, as well as the water flow velocity, water depth, and incoming flow angle are determined.

[0067] S203. Based on the aforementioned suspension velocity, flow resistance coefficient, floating point coordinates, and mechanical equilibrium equations under the action of water flow, a theoretical mathematical model for floating inversion using PU polymer as a root rock is established.

[0068] In order to obtain the mathematical model of the floating inversion theory, in the preferred embodiment of this scheme, the following formulas (1) and (2) are used to determine the mathematical model of the floating inversion theory;

[0069]

[0070]

[0071] In equations (1) and (2) above, (x0, y0) are the coordinates of the lost point actually measured by the PU polymer as the lost root stone, (x, y) are the coordinates of the floating point of the PU polymer as the lost root stone, and v x Let v be the velocity of the water flow in the x-direction. y Let H be the velocity of the water flow in the y-direction, H be the water depth, and C be the velocity of the water flow in the y-direction. d ρ is the drag coefficient around the flow, v is the flow velocity, and ρ is the flow velocity. 水 ρ is the density of water. 示 Let PU polymer be the density of the underwater root stone, α be the inflow angle, a be the side length of the underwater root stone, and v be the density of the PU polymer as the root stone. x v is the horizontal water flow velocity. y Let g be the vertical water flow velocity, and g be the acceleration due to gravity.

[0072] Specifically, a mathematical model for buoyancy inversion theory is established by using the principles of flow mechanics equilibrium and kinematics to utilize PU polymers as the root of loss.

[0073] From the mechanical equilibrium equations, we get:

[0074] G+F d -F 浮 =0

[0075]

[0076] G′=(ρ水 -ρ 示 )ga 3

[0077]

[0078]

[0079]

[0080] Floating point coordinates:

[0081]

[0082] Where G' is the difference between gravity and buoyancy, G is gravity, and F is buoyancy. d For the flow resistance, F 浮 For buoyancy. U0 is P U The vertical buoyancy velocity, where H is the water depth in the experimental bucket, and a is the side length of the PU cube. ρ 示 ρ is the density of the foaming agent. 示 =0.0443g / cm 3 x0' is the abscissa of the foaming agent when it floats to the surface, as measured in the experiment, and y0' is the ordinate of the foaming agent when it floats to the surface, as measured in the experiment. When the foaming agent moves to the surface, (x, y) is (x0', y0').

[0083] The coordinates of the point where the underwater rock went missing can be obtained from the coordinates of the floating point. Specifically:

[0084]

[0085]

[0086] S204, Based on the floating inversion theoretical mathematical model, determine a number of correction coefficients, and use the number of correction coefficients to correct the theoretical correction coefficients of the floating inversion theoretical mathematical model, thereby determining the correction coefficients of the floating inversion mathematical model.

[0087] Specifically, considering that the PU polymer, as a floating body for lost foundation stones, is affected by various turbulent flow factors during planar motion, in order to determine the corrected coordinates of the underwater foundation stone loss point, in the preferred embodiment of this scheme, based on the floating inversion theory mathematical model, the correction coefficients βx and βy of the floating inversion theory mathematical model are determined, wherein the correction coefficients βx and βy are determined according to the following formulas (3) and (4):

[0088] βx=x0 / x′0 (3)

[0089] βy=y0 / y′0 (4)

[0090] In equations (3) and (4) above, βx is the correction coefficient in the direction, βy is the correction coefficient in the direction, x0 is the x-coordinate of the actual measured loss point of the PU polymer as the lost root stone, x is the x-coordinate of the floating point of the PU polymer as the lost root stone, y0 is the y-coordinate of the actual measured loss point of the PU polymer as the lost root stone, and y is the y-coordinate of the floating point of the PU polymer as the lost root stone. Several correction coefficients are obtained, and the theoretical correction coefficients of the floating inversion mathematical model are corrected based on these correction coefficients, thereby determining the correction coefficients of the floating inversion mathematical model.

[0091] S205. Based on the correction coefficient, water depth, water flow velocity, water density, the correlation between the flow resistance coefficient and the shape of the floating body of the root stone, the floating body shape of the lost root stone of the dam, the density of the lost root stone of the dam, and the incoming flow angle, a floating inversion mathematical model is constructed.

[0092] Specifically, the floating inversion mathematical model is determined based on the following formulas (5) and (6):

[0093]

[0094]

[0095] In equations (5) and (6) above, (x s ′,y s (x′) represents the corrected coordinates of the point where the lost foundation stone of the dam was lost. 10 y 10 ) represents the coordinates of the point where the foundation stones of the dam were lost, β 1x and β 1y Here, H1 is the correction factor, and C is the water depth. d U is the drag coefficient, U0 is the settling velocity of the fluid, v is the flow velocity, α is the inflow angle, and A is the flow angle. d ρ is the projected area around the PU tracer. w ρ is the density of the river water. p Let Vp be the density of the lost foundation stone of the dam, Vp be the volume of the lost foundation stone of the dam, Δx be the displacement increment of the lost foundation stone of the dam in the x direction, Δy be the displacement increment of the lost foundation stone of the dam in the y direction, U0 be the buoyancy velocity of the fluid, and g be the gravitational acceleration.

[0096] S206, Determine the location of the lost foundation stones of the dam according to the floating inversion mathematical model.

[0097] Specifically, the shape and side length of the PU polymer as a lost anchor or dam lost anchor are obtained through an image recognition device. The floating point position of the PU polymer as a lost anchor or dam lost anchor is calculated using an internal coordinate system established by an image monitoring device. The coordinates of the dam lost anchor's floating point are determined based on the floating point position. The incoming flow angle can be obtained through local video monitoring image analysis. Water depth and flow velocity can be obtained in real time using particle image velocimeters and radar depth sounders installed on-site, and are known to the floatation model. The floating point coordinates, water depth, flow resistance coefficient, water velocity, water density, dam lost anchor density, and incoming flow angle of the dam lost anchor are obtained, and the actual coordinate position of the dam lost anchor is calculated using the floatation inversion mathematical model.

[0098] In one embodiment of this application, based on the groyne flume model, several floating point coordinates, several water flow velocities, and several incoming flow angles are obtained for the PU polymer as the lost root stone under different flow velocities and incoming flow angles. Using these floating point coordinates, water flow velocities, and incoming flow angles, and the floatation inversion theoretical mathematical model, several underwater root stone loss point coordinates and actually measured underwater root stone floating point coordinates are calculated. Several correction coefficients are then calculated using these coordinates, and the theoretical correction coefficients of the floatation inversion theoretical mathematical model are corrected using these correction coefficients, thereby determining the correction coefficients of the floatation inversion mathematical model. Considering the complexity of actual river water movement, it is necessary to use the flume model test results to correct the floatation theoretical model; that is, to correct the theoretical calculated values ​​of the model using floatation correction coefficients. The floatation correction coefficients are determined by deducing from experimental measurement results. It is a correction coefficient obtained by statistically analyzing the measured values ​​of the root stone loss locations from a large number of model experiments and the calculated values ​​from the theoretical model inversion, establishing the correlation between the two, and then fitting the results.

[0099] like Figure 6-7 As shown, this application includes a dam foundation embedded buoy identification and tracking DTP system. The model usage steps are as follows: First, input the coordinates of the float position (x0, y0). Second, select the color of the floating object. Selecting the color helps determine the approximate location of the PU buoy, as PUs are deployed according to color zones, reducing discrimination errors. Next, input the inflow angle, flow velocity, and water depth. Then, select the PU tracer shape type, which includes three types: elongated, square, and spherical. Input the float position coordinates (x0, y0) and input the C value according to the shape type. d Based on the theoretical calculations and experimental measurements of the lost point coordinates, correction coefficients βx and βy can be calculated. Finally, by substituting the known data into the correction formula, the lost point coordinates (x, y, ...) can be obtained. s ′,ys ′).

[0100] This invention establishes a buoyancy inversion mathematical model based on hydrodynamic principles, using PU polymer as a tracer for lost foundation stones. This model can be used to calculate the location of lost foundation stones in the dam area. Simultaneously, two auxiliary experimental devices using PU polymer as a tracer for lost foundation stones were designed. These devices can determine the key technical parameters and correction coefficients of lost foundation stones in river dams, enabling the accurate determination of underwater foundation stone loss locations using captured tracer and flow field information.

[0101] like Figure 8 As shown, this application provides a device for detecting the location of lost foundation stones in dams based on float-inversion, characterized in that the device includes:

[0102] The first acquisition module is used to acquire the suspension velocity and flow resistance coefficient of PU polymer as a lost root stone under the action of water flow by constructing a vertical suspension experimental model, and to construct the correlation between the flow resistance coefficient and the shape of the root stone float.

[0103] The second acquisition module is used to acquire the water flow velocity, water depth and incoming angle by constructing a groyne water channel model, and to acquire the coordinates of the floating point of the PU polymer as the lost root stone under the action of water flow.

[0104] A module is established to build a theoretical mathematical model for buoyancy inversion using PU polymer as a root rock, based on the suspension velocity, flow resistance coefficient, floating point coordinates and mechanical equilibrium equations under the action of water flow.

[0105] The first determining module is used to determine a number of correction coefficients based on the floating inversion theory mathematical model, so as to correct the theoretical correction coefficients of the floating inversion theory mathematical model through the number of correction coefficients, thereby determining the correction coefficients of the floating inversion mathematical model.

[0106] A construction module is used to construct a floating inversion mathematical model based on the correction coefficient, water depth, water flow velocity, water density, the correlation between the flow resistance coefficient and the shape of the floating body of the root stone, the floating body shape of the root stone lost in the dam, the density of the root stone lost in the dam, and the incoming flow angle.

[0107] The second determining module is used to determine the location of the lost foundation stones of the dam based on the floating inversion mathematical model.

[0108] like Figure 9As shown in the embodiment of this application, another device for detecting the location of lost foundation stones in a dam is provided, including a memory, a processor, and a transceiver that are connected in sequence. The memory is used to store a computer program, the transceiver is used to send and receive messages, and the processor is used to read the computer program and execute the dam foundation stone loss monitoring method as described in the embodiment.

[0109] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for detecting the location of lost foundation stones in a dam based on float-inversion, characterized in that, include: By constructing a vertical suspension experimental model, the suspension velocity and flow resistance coefficient of PU polymer as a lost root stone under the action of water flow were obtained, and the correlation between the flow resistance coefficient and the shape of the root stone float was constructed. By constructing a groyne flume model, the water flow velocity, water depth, and incoming flow angle are obtained, as well as the coordinates of the floating point of the PU polymer as the lost root stone under the action of water flow are obtained. Based on the aforementioned suspension velocity, flow resistance coefficient, floating point coordinates, and mechanical equilibrium equations under the action of water flow, a theoretical mathematical model for float-off inversion using PU polymer as a root rock is established. Based on the floating inversion theory mathematical model, several correction coefficients are determined to correct the theoretical correction coefficients of the floating inversion theory mathematical model, thereby determining the correction coefficients of the floating inversion mathematical model. Based on the correction coefficient, water depth, water flow velocity, water density, the correlation between the flow resistance coefficient and the shape of the floating body of the foundation stone, the floating body shape of the foundation stone lost by the dam, the density of the foundation stone lost by the dam, and the incoming flow angle, a floating inversion mathematical model is constructed. The location of the lost foundation stones of the dam is determined based on the aforementioned floating inversion mathematical model; The mathematical model for the floating inversion theory is determined using the following formulas (1) and (2); （1） （2） In equations (1) and (2) above, (x0, y0) are the coordinates of the lost point actually measured by the PU polymer as the lost root stone, and (x, y) are the coordinates of the floating point of the PU polymer as the lost root stone. Let be the velocity of the water flow in the x-direction. Let H be the velocity of the water flow in the y-direction, H be the water depth, and C be the velocity of the water flow in the y-direction. d The drag coefficient is the coefficient of flow around the object. For water flow velocity, The density of water, The density of PU polymer as a root stone. Let 'a' be the angle of the incoming flow, and 'a' be the side length of the underwater rock. The horizontal water flow velocity, The vertical water flow velocity, This is the acceleration due to gravity.

2. The method according to claim 1, characterized in that, The correction coefficients are determined based on the aforementioned floating inversion theory mathematical model according to the following formulas (3) and (4): （3） （4） In equations (3) and (4) above, βx is the correction coefficient in the x-direction and βy is the correction coefficient in the y-direction. Let x represent the x-coordinate of the actual loss point measured using PU polymer as the lost root stone, and let x represent the x-coordinate of the floating point of the PU polymer as the lost root stone. y is the ordinate of the actual loss point measured by PU polymer as the lost root stone, and y is the ordinate of the floating point of PU polymer as the lost root stone. Several correction coefficients are obtained, and the theoretical correction coefficients of the floating inversion mathematical model are corrected based on these correction coefficients, thereby determining the correction coefficients of the floating inversion mathematical model.

3. The method according to claim 1, characterized in that, Constructing a groyne flume model, specifically: The glass water tank of the groyne model is 20m long, 3m wide, and 0.6m high, and the length of the groyne below it is... and the angle between it and the shoreline is .

4. The method according to claim 1, characterized in that, The vertical suspension experimental model is constructed as follows: The vertical suspension experiment model is a suspension observation tube, which is 1.5m high, 250mm in diameter, and 1.3m deep in water. The bottom of the suspension observation tube is equipped with a strong magnetic clamp and a release mechanism.

5. The method according to claim 4, characterized in that, The method further includes: Based on the vertical suspension experimental model, several flow resistance coefficients of PU polymers of different shapes as lost anchors were obtained, and several flow resistance coefficients, underwater anchor float shape and flow Reynolds number relationship curves were established based on the flow resistance coefficients.

6. The method according to claim 1, characterized in that, The floating inversion mathematical model is determined based on the following formulas (5) and (6): （5） （6） In equations (5) and (6) above, (x s ´,y s (x) represents the corrected coordinates of the point where the lost foundation stone of the dam was lost. 10 y 10 ( ) represents the coordinates of the point where the foundation stones of the dam were lost. and Here, H1 is the correction factor, and C is the water depth. d Let U be the drag coefficient, and U0 be the fluid's upward velocity. For water flow velocity, For the angle of the incoming flow, The projected area around the lost foundation stones of the dam. The density of the river water. Let Vp be the density of the lost foundation stones in the dam, and Vp be the volume of the lost foundation stones in the dam. Let x be the displacement increment of the lost foundation stone of the dam in the x-direction. Let represent the displacement increment of the lost foundation stones of the dam in the y-direction. This is the acceleration due to gravity.

7. The method according to claim 3, characterized in that, The method further includes: The shape and side length of the PU polymer as a lost foundation stone or a lost foundation stone of a dam are obtained by an image recognition device. The floating point position of the PU polymer as a lost foundation stone or the floating point position of the lost foundation stone of a dam is obtained by converting the internal coordinate system established by the image monitoring instrument.

8. A device for detecting the location of lost foundation stones in a dam based on float-inversion, characterized in that, The apparatus is used to perform the method for detecting the location of lost foundation stones in a dam as described in any one of claims 1 to 7, wherein the apparatus comprises: The first acquisition module is used to acquire the suspension velocity and flow resistance coefficient of PU polymer as a lost root stone under the action of water flow by constructing a vertical suspension experimental model, and to construct the correlation between the flow resistance coefficient and the shape of the root stone float. The second acquisition module is used to acquire the water flow velocity, water depth and incoming angle by constructing a groyne water channel model, and to acquire the coordinates of the floating point of the PU polymer as the lost root stone under the action of water flow. A module is established to build a theoretical mathematical model for buoyancy inversion using PU polymer as a root rock, based on the suspension velocity, flow resistance coefficient, floating point coordinates and mechanical equilibrium equations under the action of water flow. The first determining module is used to determine a number of correction coefficients based on the floating inversion theory mathematical model, so as to correct the theoretical correction coefficients of the floating inversion theory mathematical model through the number of correction coefficients, thereby determining the correction coefficients of the floating inversion mathematical model. A construction module is used to construct a floating inversion mathematical model based on the correction coefficient, water depth, water flow velocity, water density, the correlation between the flow resistance coefficient and the shape of the floating body of the root stone, the floating body shape of the root stone lost in the dam, the density of the root stone lost in the dam, and the incoming flow angle. The second determining module is used to determine the location of the lost foundation stones of the dam based on the floating inversion mathematical model.

9. A device for detecting the location of lost foundation stones in a dam based on float-inversion, characterized in that, The device includes a memory, a processor, and a transceiver that are sequentially and communicatively connected. The memory is used to store a computer program, the transceiver is used to send and receive messages, and the processor is used to read the computer program and execute the dam loss rock location detection method as described in any one of claims 1 to 7.

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