Video-based water level flow online flow measuring device and method

Abstract

The application provides a kind of water level flow online flow measuring equipment and flow measuring method based on video, it is related to drainage basin monitoring technical field, wherein the flow measuring equipment includes installation support, video acquisition unit and aeration component, the bottom of installation support is welded with fixed plate, the bottom of fixed plate is inserted with first anchor rod, and fixed plate is installed on the bank of the side of the river to be measured by a plurality of first anchor rods, the top of video acquisition unit is provided with guide slope, the bottom of guide slope is welded with lower hanging rod, the application expands the scope of application, and can float synchronously with the change of water level, ensure that it can provide bubbles as identification features to measure flow rate, and then obtain accurate water level flow data. It can provide a running flow measuring environment at night. Additional real-time rainfall judgment function is provided, which realizes accurate judgment of the influence data of current rainfall on current flow. It can fully reflect the overall situation of river flow.

Description

Technical Field

[0001] This invention relates to the field of watershed monitoring technology, specifically to a video-based online water level and flow measurement device and method. Background Technology

[0002] River flow measurement allows for precise determination of water volume in a river, helping to identify dry and wet seasons. During dry seasons, water resource allocation can be planned in advance to prevent water shortages; during wet seasons, appropriate water storage strategies, such as reservoir storage, can be considered. Furthermore, suitable water flow velocity and volume are essential for fish survival and reproduction. Excessively low river flow can lead to habitat loss and hindered reproduction. Therefore, flow measurement enables the rational regulation of water resources, ensuring the basic flow requirements of river ecosystems and maintaining river biodiversity.

[0003] In existing technologies, the current meter method is a relatively classic method for measuring flow. Its principle involves placing a current meter at a predetermined measurement point. The current meter's propeller or rotating cup rotates under the influence of the water flow, and the flow velocity is measured based on the relationship between the rotation speed and the water flow velocity. However, this method is labor-intensive, requiring manual placement of the current meter at each measurement point, and is subject to environmental limitations. In high-flow-velocity environments, the accuracy of the instrument may be affected; for example, a propeller-type current meter may over-rotate due to excessively high water flow velocity, exceeding its accurate measurement range.

[0004] The buoy method measures surface velocity by observing the drift of a buoy on the water surface. However, this method is susceptible to many external interferences, with wind direction and force significantly affecting the buoy's drift path and speed. If the wind direction is inconsistent with the water flow direction, the buoy will deviate from the flow direction, causing the calculated flow velocity to be either too high or too low than the actual flow velocity, thus affecting the accuracy of the flow rate calculation.

[0005] The Acoustic Doppler Current Profiler (ADCP) method measures flow velocity using the acoustic Doppler principle. It emits sound waves into the water, which are reflected by suspended particles or air bubbles. ADCP calculates the flow velocity based on the Doppler frequency shift of the reflected sound waves. However, this method is susceptible to interference from sound wave scattering and reflection when the sediment content is high or when there are many air bubbles in the water, thus affecting the accuracy of the flow velocity measurement. For example, in sections of the Yellow River with high sediment content, the accuracy of ADCP measurements may decrease. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a video-based online water level and flow measurement device and method, thereby solving the problems mentioned in the background. This invention effectively expands its applicability by capturing watershed images via video and can float synchronously with changes in water level, ensuring reliable bubble identification for flow velocity measurement and thus obtaining accurate water level and flow data. This invention provides a feasible flow measurement environment at night. Furthermore, it provides a real-time rainfall assessment function, enabling accurate judgment of the impact of current rainfall on current flow. This invention can more comprehensively reflect the overall situation of river flow.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] This invention provides a video-based online water level and flow measurement device, comprising a measurement device body, which includes a mounting bracket 1, a video acquisition unit 2, and an aeration assembly 3. A fixing plate 4 is welded to the bottom of the mounting bracket 1, and a first anchor rod 5 is inserted into the bottom of the fixing plate 4. The fixing plate 4 is installed on the bank of the river to be measured via multiple first anchor rods 5. A flow guide plate 15 is provided at the top of the video acquisition unit 2, and a lower hanging rod 23 is welded to the bottom of the flow guide plate 15. The bottom of the lower hanging rod 23 is welded with... There is a mounting plate 22, and a camera 21 is screwed to the bottom of the mounting plate 22. The camera 21 is tilted towards the position of the aeration component 3 to take pictures. The bottom end of the video acquisition unit 2 is welded with a bottom support rod 20, and the bottom of the bottom support rod 20 is inserted into the bottom of the water area to be measured. The aeration component 3 is installed below the video acquisition unit 2, and sinking sleeves 26 are installed at both ends of the aeration component 3. Reference plates 24 are welded to the sides of the sinking sleeves 26, and the inner sides of the two reference plates 24 are the flow measurement area.

[0009] Furthermore, the mounting bracket 1 includes a column 8, a crossbar 9, and a guide rod 11; the column 8 is welded to one end of the surface of the fixing plate 4, the crossbar 9 is welded to the top of the column 8, and a connecting plate 10 and a top support rod 14 are welded to the surface of the crossbar 9; the guide rod 11 is inserted into the bottom end of the connecting plate 10, and the surface of the guide rod 11 is engraved with water level scale lines 12.

[0010] Furthermore, there are two guide rods 11, and the two guide rods 11 are parallel to each other. A second anchor rod 13 is inserted into the bottom end of each guide rod 11, and the bottom of the second anchor rod 13 is inserted into the water body.

[0011] Furthermore, the video acquisition unit 2 includes a flow guide plate 15 and a camera 21; side baffles 17 are welded to both sides of the flow guide plate 15, the surface of the side baffles 17 is welded to the bottom end of the top support rod 14, a water storage tank 16 is provided at the bottom end of the flow guide plate 15, and a surrounding plate 18 is welded to the side of the water storage tank 16.

[0012] Furthermore, drainage pipes 19 are inserted on both sides of the enclosure 18, and the inner side of the water storage tank 16 is connected to the space on both sides through the drainage pipes 19; the guide plate 15 is used to guide the rainwater at the top towards the interior of the water storage tank 16, and the drainage pipes 19 are used to discharge the rainwater accumulated inside the water storage tank 16 towards both sides, and the end of the drainage pipes 19 is within the shooting range of the camera 21; the bottom support rod 20 is welded to the bottom of the water storage tank 16, and the bottom of the bottom support rod 20 is embedded in the bottom of the water area, and the water flow direction inside the area to be measured is: from the lower end of the guide plate 15 to the higher end.

[0013] Furthermore, the aeration assembly 3 includes an aeration channel 27 and an air pump 6; the air pump 6 is mounted on the surface of the fixed plate 4, one end of the air pump 6 is inserted with an air supply pipe 7, the end of the air supply pipe 7 is connected to the aeration channel 27, the aeration channel 27 has a flow-dividing cavity 28 inside, and the surface of the aeration channel 27 has aeration holes 29; a rotating shaft 30 is installed on the side of the aeration channel 27, and a sealing plate 31 is connected to the side of the rotating shaft 30.

[0014] Furthermore, the sealing plate 31, after rotating around the rotating shaft 30, is used to press against the surface of the aeration hole 29; a limiting strip 32 is welded to the side of the aeration channel 27, and the limiting strip 32 is used to block the sealing plate 31; connecting rods 33 are inserted at both ends of the aeration channel 27, and a fixing sleeve 34 is welded to the end of the connecting rod 33; a sinking sleeve 26 is inserted into the inner side of the fixing sleeve 34; a floating plate 25 is attached to the top of the sinking sleeve 26; and a marking line 37 is printed on the surface of the floating plate 25; the sinking sleeve 26 and the floating plate 25 are both fitted outside the area of ​​the water level scale line 12 of the guide rod 11 and move up and down along the guide rod 11.

[0015] Furthermore, a reference plate 24 is integrally formed on the side of the floating plate 25. An indicator light 35 is embedded in the inner wall of the reference plate 24, and a reference line 36 is also printed on the inner wall of the reference plate 24. There are two reference plates 24 and two floating plates 25, and the two reference plates 24 are parallel to each other. The bubbles generated inside the aeration channel 27 flow along the inner side area of ​​the two reference plates 24.

[0016] The present invention also provides a flow measurement method using a video-based online water level and flow measurement device, comprising the following steps:

[0017] Step S1: Select the installation location of the flow measurement equipment. Choose a location where the water flow of the target river section can be clearly and completely captured, and collect the river section data at that location.

[0018] Step S2: Set up the flow measurement equipment and start the video acquisition unit 2 and aeration component 3;

[0019] Step S3: Collect bubble flow data and current water level depth data within the flow measurement area;

[0020] Step S4: Calculate the current flow rate based on the current water level depth data, flow velocity, and cross-sectional data;

[0021] Step S5: In rainy weather scenarios, additional real-time precipitation data is collected based on video information to obtain information on the impact of precipitation on water level and flow rate.

[0022] Step S6: Start the flow measurement process at regular intervals, and automatically seal the aeration component 3 through the sealing plate when it is off.

[0023] Furthermore, the water flow velocity is obtained in the following ways:

[0024] Step A1: The video acquisition unit 2 is installed above the highest water level. The aeration component 3 floats on the water surface and at a fixed depth below the water surface through a floating structure. The aeration component 3 floats synchronously with the rise and fall of the water level. The frame rate of the camera is 30 frames / second or higher.

[0025] Step A2: The inner area of ​​the two reference plates 24 of the aeration component 3 is the flow measurement area; the aeration component 3 actively generates bubbles, and the bubbles move with the water flow in the flow measurement area inside the two reference plates 24.

[0026] Step A3: The video acquisition unit 2 acquires bubble flow data in the flow measurement area, captures water flow images containing bubbles, and calculates the bubble flow velocity by analyzing the position changes of the bubbles in continuous frame images, and then calculates the water flow velocity.

[0027] Rainfall data in rainy weather scenarios is obtained through the following methods:

[0028] In rainy weather scenarios, rainwater is blocked by the guide plate 15 on the top of the camera 21 and concentrated inside the water storage tank 16. The greater the amount of rainwater, the higher the water level inside the water storage tank 16, which will then be discharged downward from a greater number of drainage pipes 19. At this time, the number of drainage pipes 19 activated by the camera 21 is used to obtain the current rainfall information.

[0029] In step S4, the method for obtaining the cross-sectional data is as follows: the river cross-section in the current flow measurement area is divided into a combination of multiple simple geometric shapes, the area of ​​each simple geometric shape is calculated, and then the obtained areas are added together to obtain the total area of ​​the river cross-section.

[0030] The video-based online water level and flow measurement device and method provided by this invention have the following advantages:

[0031] 1. This video-based online water level and flow measurement device actively generates bubbles through an aeration component. Combined with a video acquisition unit, it can provide intuitive and efficient measurement results in scenarios with low flow rates or clean and clear water environments, thus expanding its applicable range. It can also float synchronously with changes in water level to ensure that reliable bubbles are always provided as identification features for flow rate measurement, thereby obtaining accurate water level and flow data.

[0032] 2. This video-based online water level and flow measurement device divides the measurement area in the aeration component using a reference plate. The reference plate is also used to measure the current flow position of actively generated bubbles. The flow velocity data is then calculated based on this highly accurate position data. At the same time, it can provide an operational flow measurement environment at night.

[0033] 3. This video-based online water level and flow measurement device uses a guide plate to shield the top area in the video acquisition unit, protecting the camera while also diverting and concentrating rainwater in rainfall scenarios to prevent interference from rainwater on the measurement area. This ensures high accuracy in flow measurement even in rainfall scenarios. It also provides a real-time rainfall assessment function, enabling accurate judgment of the impact of current rainfall on current flow rate.

[0034] 4. This video-based online flow measurement method can simultaneously monitor a large river area. It can cover a significant water surface area of ​​a river section and acquire flow information from multiple locations. Compared to traditional single-point measurement methods (such as the current meter method), it can more comprehensively reflect the overall river flow situation; moreover, the camera does not directly contact the water flow, making it particularly suitable for situations with rapid currents and abundant floating debris, such as during flood season. It can provide intuitive video image data, facilitating visualization analysis by staff. If there are questions about the flow measurement results or further research is needed, the video can be reviewed to view the flow conditions at that time. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the external structure of a video-based online water level and flow measurement device according to the present invention;

[0036] Figure 2This is a schematic diagram of the structure of the mounting bracket portion of the present invention;

[0037] Figure 3 This is a schematic diagram of the video acquisition unit of the present invention;

[0038] Figure 4 This is a schematic diagram of the camera portion of the present invention;

[0039] Figure 5 This is a schematic diagram of the aeration component of the present invention;

[0040] Figure 6 This is a cross-sectional view of the aeration component of the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of the reference plate portion of the present invention;

[0042] Figure 8 for Figure 1 Enlarged view of region A in the middle;

[0043] Figure 9 This is a flowchart of a video-based online water level and flow measurement method according to the present invention;

[0044] In the diagram: 1. Mounting bracket; 2. Video acquisition unit; 3. Aeration assembly; 4. Fixing plate; 5. First anchor bolt; 6. Air pump; 7. Air supply pipe; 8. Column; 9. Horizontal bar; 10. Connecting plate; 11. Guide rod; 12. Water level scale line; 13. Second anchor bolt; 14. Top layer support rod; 15. Flow guide plate; 16. Water storage tank; 17. Side baffle; 18. Enclosure panel; 19. Drainage pipe; 20. Bottom layer support rod; 21. Camera; 22. Mounting plate; 23. Lower hanging rod; 24. Base plate; 25. Floating plate; 26. Sinking sleeve; 27. Aeration channel; 28. Diversion cavity; 29. ​​Aeration hole; 30. Rotating shaft; 31. Sealing plate; 32. Limiting strip; 33. Connecting rod; 34. Fixing sleeve; 35. Indicator light; 36. Baseline; 37. Marking line. Detailed Implementation

[0045] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0046] Please see Figures 1 to 9The present invention provides the following technical solution: an online water level and flow measurement device based on video, comprising a measurement device body, the measurement device body including a mounting bracket 1, a video acquisition unit 2, and an aeration assembly 3; a fixing plate 4 is welded to the bottom of the mounting bracket 1, and a first anchor rod 5 is inserted into the bottom of the fixing plate 4, and the fixing plate 4 is installed on the bank of the river to be measured by multiple first anchor rods 5; a flow guide plate 15 is provided at the top of the video acquisition unit 2, and a lower hanging rod 23 is welded to the bottom of the flow guide plate 15. A mounting plate 22 is welded to the bottom of the aeration assembly 3. A camera 21 is screwed to the bottom of the mounting plate 22. The camera 21 is tilted towards the position of the aeration assembly 3 to take pictures. A bottom support rod 20 is welded to the bottom of the video acquisition unit 2, and the bottom of the bottom support rod 20 is inserted into the bottom of the water area to be measured. The aeration assembly 3 is installed below the video acquisition unit 2, and sinking sleeves 26 are installed at both ends of the aeration assembly 3. Reference plates 24 are welded to the sides of the sinking sleeves 26, and the inner sides of the two reference plates 24 are the flow measurement area. This invention calculates the flow velocity of the water area by video measuring the bubble flow velocity, and then obtains water level and flow rate data.

[0047] In use, this invention involves selecting a location for the flow measurement equipment, choosing a spot where the target river cross-section's water flow can be clearly and completely captured, and collecting cross-sectional data at that location. The flow measurement equipment is then set up, and the video acquisition unit 2 and aeration assembly 3 are activated. The video acquisition unit 2 is installed entirely above the highest water level, while the aeration assembly 3 floats on the water surface and at a fixed depth below the surface via a floating structure. The camera 21 has a frame rate of 30 frames per second or higher. Data on bubble flow within the measurement area, as well as current water level and depth, are collected. Based on the current water level and depth data, flow velocity, and cross-sectional data, the current flow rate is calculated. The river cross-section within the current measurement area is divided into combinations of multiple simple geometric shapes, and the area of ​​each simple geometric shape is calculated and then summed to obtain the total area of ​​the river cross-section. In rainy weather scenarios, real-time rainfall data is additionally collected based on the video information to obtain information on the impact of rainfall on water level and flow rate. The flow measurement process is initiated periodically, and the aeration assembly 3 is automatically shut off when the system is off.

[0048] In this embodiment, the mounting bracket 1 includes a column 8, a crossbar 9, and a guide rod 11. The column 8 is welded to one end of the surface of the fixing plate 4. The top of the column 8 is welded to the crossbar 9. A connecting plate 10 and a top support rod 14 are welded to the surface of the crossbar 9. The bottom end of the connecting plate 10 is inserted into the guide rod 11, and the surface of the guide rod 11 is engraved with water level scale lines 12. There are two guide rods 11, and the two guide rods 11 are parallel to each other. The bottom end of each guide rod 11 is inserted into a second anchor rod 13. The second anchor rod 13 and the bottom of the guide rod 11 are inserted into the water body. By actively generating bubbles through the aeration component 3, and in conjunction with the video acquisition unit 2, intuitive and efficient measurement results can be provided in scenarios with low flow rates or clean and clear water environments, expanding the scope of application. It can also float synchronously with changes in water level to ensure that reliable bubbles can always be provided as identification features for flow rate measurement, thereby obtaining accurate water level and flow rate data.

[0049] Specifically, the air pump 6, the guide rod 11 at the end, and the top support rod 14 are supported by the mounting bracket 1, thereby achieving the support effect for the bottom video acquisition unit 2 and the aeration component 3. The video acquisition unit 2 is always fixed at a certain height on the water surface, while the aeration component 3 floats synchronously along the guide rod 11 as the water level rises and falls.

[0050] In this embodiment, the video acquisition unit 2 includes a flow guide ramp 15 and a camera 21. Side baffles 17 are welded to both sides of the flow guide ramp 15, and the surface of the side baffles 17 is welded to the bottom end of the top support rod 14. A water storage tank 16 is provided at the bottom end of the flow guide ramp 15, and a surrounding plate 18 is welded to the side of the water storage tank 16. Drainage pipes 19 are inserted into both sides of the surrounding plate 18, and the inner side of the water storage tank 16 is connected to the spaces on both sides through the drainage pipes 19. The flow guide ramp 15 is used to guide rainwater from the top towards the interior of the water storage tank 16, and the drainage pipes 19 are used to discharge rainwater accumulated inside the water storage tank 16 towards both sides. The end of the drainage pipes 19 is within the shooting range of the camera 21. A bottom support rod 20 is welded to the bottom end of the water storage tank 16, and the bottom of the bottom support rod 20 is embedded in the bottom of the water area. The water flow direction inside the area to be measured is from the lower end of the flow guide ramp 15 towards the higher end. In the video acquisition unit 2, the top area is shielded by the flow guide ramp 15, which not only protects the camera 21, but also guides and concentrates rainwater in the rain scene to avoid rainwater from interfering with the flow measurement area. This ensures that the flow measurement accuracy is still high in the rain scene. It also provides an additional real-time judgment function of rainfall, which realizes the accurate judgment of the impact of the current rainfall on the current flow.

[0051] Specifically, using air bubbles as tracers, the bubbles generated by the aeration component 3 move along with the water flow. The movement of these bubbles reflects the water flow's state. Camera 21 captures images of the water flow containing the bubbles. The video equipment records the positional changes of the bubbles in consecutive frames. By analyzing these video frames, the bubble motion information can be obtained. The displacement of the bubbles between two frames is determined from the video images. The bubble velocity is calculated based on the displacement over a fixed time interval between two frames, and thus the water flow velocity is calculated.

[0052] Rainwater is blocked by a guide plate 15 at the top of the camera 21 and concentrated inside the water storage tank 16. The drainage pipes 19 on both sides of the water storage tank 16 are located at different heights. Therefore, the greater the amount of rainwater, the higher the water level inside the water storage tank 16, which will then be discharged downward from a greater number of drainage pipes 19. At this time, the current rainfall information is still obtained by capturing the number of drainage pipes 19 in the camera 21.

[0053] In this embodiment, the aeration assembly 3 includes an aeration channel 27 and an air pump 6. The air pump 6 is mounted on the surface of the fixed plate 4. One end of the air pump 6 is inserted into an air supply pipe 7, and the end of the air supply pipe 7 is connected to the aeration channel 27. A diversion cavity 28 is opened inside the aeration channel 27, and aeration holes 29 are opened on the surface of the aeration channel 27. A rotating shaft 30 is installed on the side of the aeration channel 27, and a sealing plate 31 is connected to the side of the rotating shaft 30. The sealing plate 31, after rotating around the rotating shaft 30, is used to press against the surface of the aeration hole 29. A limiting strip 32 is welded to the side of the aeration channel 27 to block the sealing plate 31. Connecting rods 33 are inserted at both ends of the aeration channel 27, and a fixing sleeve 34 is welded to the end of each connecting rod 33. A sinking sleeve 26 is inserted inside the fixing sleeve 34, and a floating plate 25 is attached to the top of the sinking sleeve 26. Marking lines 37 are printed on the surface of the floating plate 25. Both the sinking sleeve 26 and the floating plate 25 are fitted outside the area of ​​the water level scale line 12 on the guide rod 11 and move up and down along the guide rod 11. The floating plate 25 has an integrally formed reference plate 24 on its side. An indicator light 35 is embedded in the inner wall of the reference plate 24, and a reference line 36 is also engraved on its inner wall. There are two reference plates 24 and two floating plates 25, and the two reference plates 24 are parallel to each other. Bubbles generated inside the aeration channel 27 flow along the inner areas of the two reference plates 24. In the aeration assembly 3, the reference plates 24 are used to divide the flow measurement area and measure the current flow position of actively generated bubbles. This highly accurate position data is then used to calculate the flow velocity data, and it also provides an operable flow measurement environment at night.

[0054] Specifically, the air pump 6 delivers the bubbles into the diversion cavity 28 and sprays them out through the aeration hole 29, thus achieving the purpose of actively generating bubbles. With the help of the reference plates 24 on both sides as indicators, as well as the indicator lights 35 and reference lines 36 on the surface, the bubbles are displayed in the image captured by the camera 21. With the reference line 36 as the far point, the change in distance between the bubble and the reference line 36 between two frames can be obtained to obtain the movement rate of the bubble.

[0055] This embodiment also provides a flow measurement method using the above-mentioned flow measurement equipment, including the following steps:

[0056] Step 1: Select the installation location of the flow measurement equipment. Choose a location where the water flow of the target river section can be clearly and completely captured, and collect the river section data at that location.

[0057] Step 2: Set up the flow measurement equipment, start the video acquisition unit 2 and the aeration component 3. The video acquisition unit 2 is installed above the highest water level, while the aeration component 3 floats on the water surface and at a fixed depth below the water surface through a floating structure. The frame rate of the camera 21 is 30 frames / second or higher.

[0058] Step 3: Collect bubble flow data and current water level depth data within the flow measurement area;

[0059] Step 4: Calculate the current flow rate based on the current water level, depth, velocity, and cross-sectional data. Divide the river cross-section within the current flow measurement area into a combination of multiple simple geometric shapes, calculate the area of ​​each of these simple geometric shapes, and then add them together to obtain the total area of ​​the river cross-section.

[0060] The water flow velocity is obtained through the following methods:

[0061] Step A1: The video acquisition unit 2 is installed above the highest water level. The aeration component 3 floats on the water surface and at a fixed depth below the water surface through a floating structure. The aeration component 3 floats synchronously with the rise and fall of the water level. The frame rate of the camera is 30 frames / second or higher.

[0062] Step A2: The inner area of ​​the two reference plates 24 of the aeration component 3 is the flow measurement area; the aeration component 3 actively generates bubbles, and the bubbles move with the water flow in the flow measurement area inside the two reference plates 24.

[0063] Step A3: The video acquisition unit 2 acquires bubble flow data in the flow measurement area, captures water flow images containing bubbles, and calculates the bubble flow velocity by analyzing the position changes of the bubbles in continuous frame images, and then calculates the water flow velocity.

[0064] Step 5: In rainy weather scenarios, additional real-time precipitation data is collected based on video information to obtain information on the impact of precipitation on water level and flow rate;

[0065] Rainfall data in rainy weather scenarios is obtained through the following methods:

[0066] In rainy weather scenarios, rainwater is blocked by the guide plate 15 on the top of the camera 21 and concentrated inside the water storage tank 16. The greater the amount of rainwater, the higher the water level inside the water storage tank 16, which will then be discharged downward from a greater number of drainage pipes 19. At this time, the number of drainage pipes 19 activated by the camera 21 is used to obtain the current rainfall information.

[0067] Step 6: Start the flow measurement process at regular intervals, and automatically seal the aeration component 3 when it is turned off.

[0068] The above method allows for simultaneous monitoring of a large river area, covering a significant water surface area and acquiring flow information from multiple locations. Compared to traditional single-point measurement methods (such as current meter methods), it provides a more comprehensive reflection of the overall river flow. Furthermore, the camera 21 does not directly contact the water flow, making it particularly suitable for situations with rapid currents and abundant floating debris, such as during flood seasons. This invention provides intuitive video image data, facilitating visualization analysis by staff. If there are questions about the flow measurement results or further research is needed, the video can be reviewed to examine the flow conditions at that time.

[0069] The video-based online water level and flow measurement device and method provided by this invention have the following advantages:

[0070] 1. This video-based online water level and flow measurement device actively generates bubbles through an aeration component. Combined with a video acquisition unit, it can provide intuitive and efficient measurement results in scenarios with low flow rates or clean and clear water environments, thus expanding its applicable range. It can also float synchronously with changes in water level to ensure that reliable bubbles are always provided as identification features for flow rate measurement, thereby obtaining accurate water level and flow data.

[0071] 2. This video-based online water level and flow measurement device divides the measurement area in the aeration component using a reference plate. The reference plate is also used to measure the current flow position of actively generated bubbles. The flow velocity data is then calculated based on this highly accurate position data. At the same time, it can provide an operational flow measurement environment at night.

[0072] 3. This video-based online water level and flow measurement device uses a guide plate to shield the top area in the video acquisition unit, protecting the camera while also diverting and concentrating rainwater in rainfall scenarios to prevent interference from rainwater on the measurement area. This ensures high accuracy in flow measurement even in rainfall scenarios. It also provides a real-time rainfall assessment function, enabling accurate judgment of the impact of current rainfall on current flow rate.

[0073] 4. This video-based online flow measurement method can simultaneously monitor a large river area. It can cover a significant water surface area of ​​a river section and acquire flow information from multiple locations. Compared to traditional single-point measurement methods (such as the current meter method), it can more comprehensively reflect the overall river flow situation; moreover, the camera does not directly contact the water flow, making it particularly suitable for situations with rapid currents and abundant floating debris, such as during flood season. It can provide intuitive video image data, facilitating visualization analysis by staff. If there are questions about the flow measurement results or further research is needed, the video can be reviewed to view the flow conditions at that time.

[0074] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This descriptive method is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A video-based water level flow online flow measuring device, characterized in that: The utility model provides a kind of river flow measurement device, including the body of flow measurement equipment, the body of flow measurement equipment includes installation support (1), video acquisition unit (2) and aeration component (3);The bottom of the installation support (1) is welded with fixed plate (4), the bottom of the fixed plate (4) is inserted with first anchor rod (5), and the fixed plate (4) is installed on the bank of the side of the river to be measured by multiple first anchor rod (5);The top of the video acquisition unit (2) is provided with guide slope (15), the bottom of the guide slope (15) is welded with lower hanging rod (23), the bottom of the lower hanging rod (23) is welded with mounting plate (22), the bottom of the mounting plate (22) is screwed with camera (21), the camera (21) is photographed at the position of the aeration component (3) with inclined angle, and the bottom of the video acquisition unit (2) is welded with bottom layer support rod (20), and the bottom of the bottom layer support rod (20) is inserted into the bottom of the water area to be measured;The aeration component (3) is installed below the video acquisition unit (2), and the both ends of the aeration component (3) are installed with sinking sleeve (26), the side of the sinking sleeve (26) is welded with reference plate (24), and the inside of two reference plates (24) is the flow measurement area; The installation support (1) includes stand (8), cross bar (9) and guide rod (11);The stand (8) is welded on the surface one end of the fixed plate (4), the top of the stand (8) is welded with the cross bar (9), and the surface of the cross bar (9) is welded with connecting plate (10) and top layer support rod (14);The bottom end of the connecting plate (10) is inserted with the guide rod (11), and the surface of the guide rod (11) is marked with water level scale line (12); The aeration component (3) includes aeration channel (27) and air pump (6);The air pump (6) is installed on the surface of the fixed plate (4), one end of the air pump (6) is inserted with air supply pipeline (7), and the terminal of the air supply pipeline (7) is connected with the aeration channel (27), the inside of the aeration channel (27) is provided with shunt cavity (28), and the surface of the aeration channel (27) is provided with aeration hole (29);The side of the aeration channel (27) is installed with rotating shaft (30), and the side of the rotating shaft (30) is connected with sealing plate (31). The sealing plate (31) is used for pressing on the surface of the aeration hole (29) after rotating around the rotating shaft (30); the side of the aeration channel (27) is welded with a limiting baffle (32), the limiting baffle (32) is used for blocking the sealing plate (31); the two ends of the aeration channel (27) are inserted with a connecting rod (33), the end of the connecting rod (33) is welded with a fixing sleeve (34), the inner side of the fixing sleeve (34) is inserted with a sinking sleeve (26), the top of the sinking sleeve (26) is attached with a floating plate (25), the surface of the floating plate (25) is marked with a mark line (37); the sinking sleeve (26) and the floating plate (25) are all sleeved outside the water level scale line (12) area of the guide rod (11) and are lifted along the guide rod (11).

2. The online video-based water level flow measuring device according to claim 1, characterized in that: The number of the guide rods (11) is two, and the two guide rods (11) are parallel to each other, the bottom end of each guide rod (11) is inserted with a second anchor rod (13), and the bottom of the second anchor rod (13) is inserted into the water body.

3. The video-based water level flow online flow measuring device according to claim 2, characterized in that: The video acquisition unit (2) comprises a guide inclined plate (15) and a camera (21); the two sides of the guide inclined plate (15) are welded with side baffles (17), the surface of the side baffles (17) is welded at the bottom end of the top layer support rod (14), the bottom end of the guide inclined plate (15) is provided with a water storage tank (16), and the side of the water storage tank (16) is welded with a surrounding plate (18).

4. The video-based water level flow online flow measuring device according to claim 3, characterized in that: The two sides of the surrounding plate (18) are inserted with a drainage pipeline (19), and the inner side of the water storage tank (16) is communicated with the two sides through the drainage pipeline (19); the guide inclined plate (15) is used for guiding the top rainwater to the inside of the water storage tank (16), the drainage pipeline (19) is used for draining the rainwater accumulated in the water storage tank (16) to the two sides, and the end of the drainage pipeline (19) is in the shooting range of the camera (21); the bottom end of the water storage tank (16) is welded with the bottom layer support rod (20), the bottom of the bottom layer support rod (20) is embedded into the water area bottom, and the flowing direction of the water body in the measured area is from the low end of the guide inclined plate (15) to the high end.

5. The video-based water level flow online flow measuring device according to claim 1, characterized in that: The side of the floating plate (25) is integrally formed with a reference plate (24), the inner wall of the reference plate (24) is embedded with an indicator light (35), and the inner wall of the reference plate (24) is also marked with a reference line (36), the number of the reference plate (24) and the floating plate (25) is two, and the two reference plates (24) are parallel to each other, and the bubbles generated in the aeration channel (27) flow along the inner side of the two reference plates (24).

6. A method of measuring flow using a video-based water level flow online flow measuring device according to claim 1, characterized in that, The method comprises the following steps: Step S1, selecting a flow measurement device installation point, selecting a place where the target river cross section flow can be clearly and completely captured, and collecting the river cross section data at the point; Step S2, building a flow measurement device, starting a video acquisition unit (2) and an aeration assembly (3); Step S3, collect bubble flow data in the flow measurement area and current water level data; Step S4, calculate the current flow based on the current water level data, flow rate and cross-sectional data; Step S5, in the rain scenario, additional real-time precipitation is collected based on video information to obtain the influence of precipitation on water level and flow; Step S6, start the flow measurement process at regular intervals, and automatically close the aeration assembly (3) through the sealing plate in the off state.

7. The flow measuring method of claim 6, wherein: The flow rate is obtained by the following method: Step A1, the video acquisition unit (2) is installed above the highest water level, the aeration assembly (3) is always floating on the water surface and fixed at a certain depth below the water surface through the floating structure, the aeration assembly (3) floats synchronously with the water level, and the frame rate of the camera is above 30 frames per second; Step A2, the inner side area of the two reference plates (24) of the aeration assembly (3) is the flow measurement area; the aeration assembly (3) actively generates bubbles, and the bubbles in the flow measurement area inside the two reference plates (24) move with the water flow; Step A3, the video acquisition unit (2) collects bubble flow data in the flow measurement area, captures water flow pictures containing bubbles, calculates the flow rate of the bubbles by analyzing the position change of the bubbles in the continuous frame images, and further calculates the flow rate of the water flow; In the rain scenario, the precipitation is obtained by the following method: In the rain scenario, the rainwater is blocked by the flow guide inclined plate (15) at the top of the camera (21) and is concentrated in the water storage tank (16), the more the amount of rainwater, the higher the water level of the rainwater in the water storage tank (16), and then more number of drainage pipes (19) will be discharged downward, at this time, the number of drainage pipes (19) enabled is obtained by the camera (21) picture to obtain the current precipitation information; In step S4, the cross-sectional data is obtained by: dividing the river section in the current flow measurement area into a plurality of simple geometric combinations, calculating the area of each simple geometric shape, and then adding the obtained areas to obtain the total area of the river section.

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