Flow measurement system and flow measurement method

Abstract

The invention provides a flow measurement system and method, and relates to the technical field of water flow measurement, the flow measurement system comprises an up-flow bank, a radar water level gauge and a mounting structure, the up-flow bank is arranged on the bottom surface of a channel, the side wall of the up-flow bank is attached to the side wall of the channel, and the radar water level gauge is arranged in the up-flow bank; the flow rising ridge is provided with a first slope surface which is higher than the bottom surface of the channel and is gradually reduced in height along the water flow direction; the radar water level gauge is used for measuring the water flow depth on the first slope surface; the radar water level gauge is arranged above the first slope surface through the mounting structure; according to the invention, the flow rising ridge is arranged on the bottom surface of the channel, so that the flow velocity of the water flow flowing through the first slope surface on the flow rising ridge is increased, sediment in the water flow is prevented from being deposited on the first slope surface, the water depth measured value measured by the radar water level gauge is the actual water depth value, and the accuracy of the water passing amount calculated according to the water depth measured value is further ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of water flow measurement, and particularly relates to a flow measurement system and a flow measurement method. Background Art

[0002] Open channel flow measurement is an effective measure for water conservation, improving irrigation water quality and irrigation efficiency in irrigation areas. It is an important means for accurately diverting, conveying, distributing and irrigating water during the implementation of the water use plan, and is also the main basis for verifying and collecting water fees. Traditional flow measurement means include using basic water gauges or measuring ropes to measure and obtain water level data. The entire measurement process is cumbersome, time-consuming and laborious, and is easily affected by human factors, with large reading errors. With the progress of technology, many information-based flow measurement methods have emerged at the present stage, such as using radar water level gauges for flow measurement.

[0003] During the flood period in some domestic irrigation areas, the sediment content in the irrigation water is extremely high, resulting in a large amount of sediment deposition at the bottom of the channel. This causes obvious deviation in the flow measurement results of the radar water level gauge.

[0004] Therefore, there is an urgent need for a new flow measurement scheme to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a flow measurement system and a flow measurement method to solve the problems existing in the above prior art. By setting an upflow weir on the bottom surface of the channel, the flow velocity of the water flowing through the first slope of the upflow weir increases, avoiding the deposition of sediment in the water on the first slope. The water depth measurement value measured by the radar water level gauge is the actual water depth value, thereby ensuring the accuracy of the water passing volume calculated based on the water depth measurement value.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] A flow measurement system includes an upflow weir, a radar water level gauge and an installation structure. The upflow weir is arranged on the bottom surface of the channel, and the side wall of the upflow weir is attached to the side wall of the channel. The upflow weir has a first slope that is higher than the bottom surface of the channel and whose height gradually decreases along the water flow direction. The radar water level gauge is used to measure the water depth on the first slope. The installation structure sets the radar water level gauge above the first slope.

[0008] As an embodiment, the upflow weir further has a second slope connected to the first slope, and along the water flow direction, the height of the second slope gradually increases.

[0009] As an embodiment, along the water flow direction, the length of the second slope is less than the length of the first slope.

[0010] As an embodiment, the installation structure includes a bracket spanning above the channel, and the radar water level gauge is fixed on the bracket.

[0011] As an embodiment, the installation structure includes a bracket spanning above the channel, a track is arranged in the bracket along the span direction, and a self-propelled device for fixing the radar water level gauge is arranged on the track.

[0012] As an embodiment, it further includes a measuring bridge spanning above the channel and adjacent to the bracket.

[0013] As an embodiment, guardrails are arranged on both sides of the measuring bridge.

[0014] As an embodiment, it further includes pedestals arranged on both sides of the channel, and both ends of the bracket and both ends of the measuring bridge are fixed on the pedestals.

[0015] The present invention also provides a flow measurement method implemented based on the above flow measurement system, including the following steps: an upflow weir is arranged on the bottom surface of the channel, the flow velocity of the water flow increases when it flows through the first slope surface of the upflow weir, and sediment cannot be deposited on the first slope surface; a radar water level gauge is arranged above the first slope surface to measure the water depth on the first slope surface and calculate the water flow rate of the channel.

[0016] The present invention has the following technical effects compared with the prior art:

[0017] By arranging an upflow weir on the bottom surface of the channel, the present invention increases the flow velocity of the water flow flowing through the first slope surface of the upflow weir, avoids the sediment in the water flow from depositing on the first slope surface, and the measured water depth value by the radar water level gauge is the actual water depth value, thereby ensuring the accuracy of the calculated water flow volume based on the measured water depth value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a flow measurement system in an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the installation structure and the measuring bridge in an embodiment of the present invention;

[0021] Figure 3 It is Figure 2 A schematic structural diagram from another perspective.

[0022] Description of the reference numerals in the drawings:

[0023] 1. Upflow weir; 11. First slope; 12. Second slope; 2. Radar water level gauge; 3. Installation structure; 31. Cross beam; 32. Leg; 4. Channel; 5. Measuring bridge; 51. Bridge body; 52. Bridge deck; 53. Guardrail; 54. Observation hole; 6. Foundation. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] The purpose of the present invention is to provide a flow measurement system and a flow measurement method to solve the problems existing in the prior art. By setting an upflow weir on the bottom surface of the channel, the flow velocity of the water flow passing through the first slope of the upflow weir increases, avoiding the sedimentation of sediment in the water flow on the first slope. The water depth measurement value measured by the radar water level gauge is the actual water depth value, thereby ensuring the accuracy of the water flow volume calculated according to the water depth measurement value.

[0026] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0027] Embodiment 1:

[0028] As Figures 1 to 3 shown, this embodiment provides a flow measurement system, including an upflow weir 1, a radar water level gauge 2, and an installation structure 3. The upflow weir 1 is arranged on the bottom surface of the channel 4, and the side wall of the upflow weir 1 is attached to the side wall of the channel 4 to ensure that the water flow passes over the upflow weir 1. The upflow weir 1 has a first slope 11 that is higher than the bottom surface of the channel 4 and whose height gradually decreases along the water flow direction; the installation structure 3 sets the radar water level gauge 2 above the first slope 11 so that the radar water level gauge 2 can measure the water flow depth of a certain cross-section on the first slope 11.

[0029] During use, the radar water level gauge 2 is set above the first slope 11 through the installation structure 3. When the water flow passes over the first slope 11, under the action of gravity, the water flow velocity increases, and sediment cannot be deposited on the first slope 11; since there is no sediment deposition on the first slope 11, the water flow depth measurement value measured by the radar water level gauge 2 for the water flow passing through the measurement cross-section on the first slope 11 is equal to the actual water flow depth value at this position, which can ensure the accuracy of the water flow volume calculated according to the water flow depth measurement value.

[0030] It should be noted that when the radar water level gauge 2 is installed and there is no water in the channel 4, the installation height of the radar water level gauge 2 relative to the bottom surface of the channel 4 at the measurement section can be measured by the radar water level gauge 2 itself. When the water flow passes by, the radar water level gauge 2 shoots radar waves towards the water surface, and after being reflected by the water surface, the radar waves are received, and the value of the water surface distance from the bottom surface of the channel 4 can be obtained, that is, the water depth measurement value. However, after a large amount of sediment accumulates on the bottom surface of the channel 4 and the water flow is above the accumulated sediment, when using the radar water level gauge 2 to measure the water level, the water depth measurement value is actually the sum of the actual water depth (the distance from the water surface to the surface of the accumulated sediment) and the thickness of the accumulated sediment, and the thickness of the accumulated sediment is unknown. Therefore, when there is a large amount of accumulated sediment on the bottom surface of the channel 4, the water depth measurement value obtained by the radar water level gauge 2 is not the actual water depth value, and the calculated water flow through this water depth measurement value is inaccurate.

[0031] In this embodiment, by setting an upflow weir 1 on the bottom surface of the channel 4, the water flow velocity flowing through the first slope 11 of the upflow weir 1 is increased, preventing sediment in the water flow from accumulating on the first slope 11. The water depth measurement value measured by the radar water level gauge 2 is the actual water depth value, thereby ensuring the accuracy of the calculated water flow based on the water depth measurement value.

[0032] In addition, making the bottom near the flow measurement section of the traditional channel 4 into a steep slope also has the effect of scouring the accumulated sediment on the bottom surface of the channel 4. However, when the sediment content in the water flow of the channel 4 is relatively large, a large amount of sediment will accumulate in the upstream and downstream channel sections of the steep slope at the flow measurement section of the channel 4, and the adjusted steep slope at the flow measurement section will gradually be silted up, causing the steep slope set at the flow measurement section to lose its function of accelerating the water flow velocity. After setting the upflow weir 1 at the bottom of the flow measurement section of the channel 4, due to the upflow weir 1 having a certain height itself, even when the sediment content in the water flow is relatively large, the time for sediment to accumulate on the surface of the upflow weir 1 due to sediment accumulation in the upstream and downstream of the channel 4 will be postponed. Thus, within a certain period of time, the water depth measured on the upflow weir 1 is not affected by sediment accumulation, reducing the cleaning frequency of the accumulated sediment.

[0033] According to the structure of different channels 4 and the sediment content in the water flow in the channel 4, the inclination angle of the first slope 11 can be reasonably set to form a steep slope, so that the water flow flowing through the first slope 11 is a rapid flow (Froude number Fr is greater than 1).

[0034] Since there is a certain height difference between the vertex of the first slope 11 and the bottom surface of the channel 4, in order to facilitate the water flow to pass through the first slope 11, the upflow weir 1 in this embodiment also has a second slope 12 connected to the first slope 11; along the water flow direction, the height of the second slope 12 gradually increases. In this embodiment, along the water flow direction, the length of the second slope 12 is less than the length of the first slope 11.

[0035] As an implementation mode, the installation structure 3 includes a bracket spanning above the channel 4, and the radar water level gauge 2 is fixedly arranged on the bracket. During use, the radar water level gauge 2 and the current meter are used in cooperation. Multiple radar water level gauges 2 are set. The staff obtains the water level-discharge relationship curve based on the measurement data of the radar water level gauges 2 and the current meters at various positions, and then calculates the water flow through the channel. The drawing of the water level-discharge relationship curve and the calculation of the water flow through the channel based on the water level-discharge relationship curve are well-known technologies to those skilled in the art, and thus will not be elaborated in this embodiment.

[0036] As another implementation mode, the installation structure 3 includes a bracket spanning above the channel 4. A track is arranged along the span direction inside the bracket, and a self-propelled device for fixing the radar water level gauge 2 is arranged on the track. The radar water level gauge 2 can reciprocate on the track driven by the self-propelled device. When the flow velocity of the water flow passing through the channel 4 is relatively large, large fluctuations will form on the water surface, and there will be a large deviation in the water depth measurement, making it impossible to effectively measure the actual water depth. The array radar flowmeter can scan the water surface from one side of the channel 4 to the other side to form a water surface line. Through a certain algorithm, the water depth at the measured cross-section of the channel 4 can be calculated very accurately. Supplementary with a proprietary algorithm (the algorithm disclosed in the invention patent with the patent number 2023112228304 can be referred to), the water flow through the channel 4 can be calculated without calibrating the water level-discharge relationship curve of the channel 4, the measurement is more convenient, and the influence of the waves caused by the rapid flow can be excluded to ensure the accuracy of the measurement data.

[0037] For the track and the self-propelled device inside the bracket, conventional technologies can be selected, and the structures of the two will not be elaborated in this embodiment.

[0038] In this embodiment, the flow measurement system further includes a measuring bridge 5 spanning above the channel 4 and adjacent to the bracket. An observation hole 54 is arranged on the bridge deck 52 of the measuring bridge 5, and the observation hole 54 is used to place the current meter during manual calibration. To ensure the walking safety of the staff on the bridge deck 52, guardrails 53 are arranged on both sides of the measuring bridge 5 in this embodiment. The guardrails 53 can be welded by seamless steel pipes, and the bottom ends of the guardrails 53 are welded to the first metal connectors. The bridge body 51 of the measuring bridge 5 is made of steel structure, including long steel beams arranged along the span of the channel 4 on both sides and short steel beams welded between the cross beams 31. Steel plates are arranged on the long steel beams and the short steel beams to form the bridge deck 52. Second metal connectors are welded on the steel beams, and the first metal connectors and the second metal connectors are bolt-connected, which can realize the fixation of the guardrails 53. Moreover, the bolt connection is convenient for disassembly and convenient for replacement when the guardrails 53 are damaged.

[0039] In this embodiment, the flow measurement system further includes pedestals 6 arranged on both sides of the channel 4. Both ends of the bracket and both ends of the flow measurement bridge 5 are fixed on the pedestals 6. Specifically, the pedestals 6 can be made of reinforced concrete. The bracket includes a cross beam 31 and legs 32 located at both ends of the cross beam 31. The track is arranged in the cross beam 31, and the legs 32 are fixed on the pedestals 6. Both ends of the bridge body 51 of the flow measurement bridge 5 are fixed on the pedestals 6, and both the bridge body 51 and the legs 32 can be connected to the pedestals 6 through anchor bolts.

[0040] Embodiment 2:

[0041] This embodiment provides a flow measurement method implemented based on the above flow measurement system, including the following steps: An upflow weir 1 is arranged on the bottom surface of the channel 4. When the water flow passes through the first slope surface 11 of the upflow weir 1, the flow velocity increases, and sediment cannot be deposited on the first slope surface 11. A radar water level gauge 2 is arranged above the first slope surface 11 to measure the water depth of the measurement section on the first slope surface 11 and calculate the water flow rate of the channel 4.

[0042] Adaptations made according to actual requirements are all within the protection scope of the present invention.

[0043] Specific examples are used in the present invention to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A flow measurement system, characterized in that: include: An upflow sill, the upflow sill is arranged on the bottom surface of the channel, the side wall of the upflow sill is in contact with the side wall of the channel, and the upflow sill has a first slope surface which is higher than the bottom surface of the channel and gradually decreases in height along the water flow direction; A radar water level meter, the radar water level meter is used to measure the depth of water flow on the first slope; and a mounting structure, wherein the mounting structure arranges the radar water level meter above the first slope surface.

2. The flow measurement system according to claim 1, characterized in that: The upflow ramp also has a second slope surface connected to the first slope surface, and the height of the second slope surface gradually increases along the water flow direction.

3. The flow measurement system according to claim 2, characterized in that: Along the water flow direction, the length of the second slope is smaller than the length of the first slope.

4. The flow measurement system according to claim 1, characterized in that: The installation structure comprises a bracket arranged across the channel, and the radar water level meter is fixed on the bracket.

5. The flow measurement system according to claim 1, characterized in that: The installation structure comprises a bracket arranged across the channel, a track is arranged inside the bracket along the span direction, and a self-propelled device for fixing the radar water level gauge is arranged on the track.

6. The flow measurement system according to claim 4 or 5, characterized in that: Also included is a measuring bridge which is arranged across the channel and adjacent to the support.

7. The flow measurement system according to claim 6, characterized in that: Guardrails are arranged on both sides of the measuring bridge.

8. The flow measurement system according to claim 7, characterized in that: It also includes a base arranged on both sides of the channel, and the two ends of the bracket and the two ends of the measuring bridge are fixed on the base.

9. A flow measurement method implemented based on the flow measurement system according to any one of claims 1 to 8, characterized in that: The following steps are involved: An upflow sill is set on the bottom surface of the channel. When the water flows through the first slope on the upflow sill, the flow velocity is accelerated, and sediment cannot be deposited on the first slope. A radar water level meter is arranged above the first slope surface to measure the water flow depth on the first slope surface and calculate the water flow rate of the channel.

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