CN113720401A - Open channel flow measurement system and method based on underwater particle velocity measurement - Google Patents
Open channel flow measurement system and method based on underwater particle velocity measurement Download PDFInfo
- Publication number
- CN113720401A CN113720401A CN202111136861.9A CN202111136861A CN113720401A CN 113720401 A CN113720401 A CN 113720401A CN 202111136861 A CN202111136861 A CN 202111136861A CN 113720401 A CN113720401 A CN 113720401A
- Authority
- CN
- China
- Prior art keywords
- water level
- bubble generator
- open channel
- underwater
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/002—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/22—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid Mechanics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention provides an open channel flow measuring system based on underwater particle velocity measurement, which comprises an underwater PIV measuring system, a Particle Image Velocimetry (PIV) measuring system and a Particle Image Velocimetry (PIV) measuring system, wherein the PIV measuring system comprises a bubble generator arranged underwater, a laser device facing to the area above the bubble generator is arranged at the downstream of the bubble generator, and a camera facing to the area above the bubble generator is also arranged at one side of a river bed; the water level measuring system comprises a water level meter and a water level measuring device, wherein the water level meter is used for measuring the water level; the data processing system comprises an embedded single chip microcomputer and is used for finishing video processing and image processing and finishing flow calculation by combining water level information; the power supply system is used for supplying power to the whole system, and the bubble generator, the laser camera, the water level meter and the data processing system are all connected with the power supply system; and the remote monitoring equipment is used for receiving the processing data of the data processing system. The invention solves the two problems that the existing open channel measurement method is low in measurement precision and a PIV method needs to spread a large amount of tracer particles.
Description
Technical Field
The invention belongs to the field of hydrological measurement and prediction, and particularly relates to an open channel flow measurement system and method based on underwater particle velocity measurement.
Background
River flow measurement is dynamic measurement on real-time flow, water level and the like of a river, can provide data support for hydrological and water conservancy calculation, mountain torrent prevention and control and the like, and is important content of hydrological work. The current commonly used flow measurement methods include buoy tracking, acoustic doppler flow profiler, handheld radar, etc. These measurement methods require manual wading, are complex to operate and have certain dangerousness, and limit the wide spread of flow rate measurement.
Particle Image Velocimetry (PIV) developed in recent years enables real-time measurement of a full flow velocity field, exhibits rich instantaneous flow velocity field information, and has been attempted to be used for measurement of open channel flow velocity. However, the conventional PIV method focuses on measuring the surface flow velocity of the open channel, and only obtains a flow velocity value of one plane, and then multiplies the flow velocity value by a flow velocity coefficient to obtain the flow rate of the open channel, and the calculation method is rough and low in accuracy. Meanwhile, the PIV needs to manually spread surface trace particles in a river, the particles naturally flow and disperse along the water flow direction, a large amount of trace particles need to be added into a large-area water area, the cost is high, and the natural flow distribution of the particles is easy to be uneven, so that the measurement and calculation result error is large.
Disclosure of Invention
The invention aims to solve the technical problem of providing an open channel flow measurement system based on underwater particle velocity measurement aiming at the defects of the background technology, and can solve two problems that the measurement precision is not high in the existing open channel measurement method and a large amount of tracer particles need to be scattered in a PIV method.
The invention adopts the following technical scheme for solving the technical problems:
an open channel flow measuring system based on underwater particle velocity measurement comprises,
the underwater P IV measuring system comprises a bubble generator arranged underwater, wherein a laser device facing to the area above the bubble generator is arranged at the downstream of the bubble generator, and a camera facing to the area above the bubble generator is also arranged at one side of a riverbed;
the water level measuring system comprises a water level meter and a water level measuring device, wherein the water level meter is used for measuring the water level;
the data processing system comprises an embedded single chip microcomputer and is used for finishing video processing and image processing and finishing flow calculation by combining water level information;
the power supply system is used for supplying power to the whole system, and the bubble generator, the laser camera, the water level meter and the data processing system are all connected with the power supply system;
and the remote monitoring equipment is used for receiving the processing data of the data processing system.
Further, bubble generator and laser instrument install jointly on a support, sliding connection has the guide rail that the perpendicular rivers direction set up under the support, the motor can drive the support and slide on the guide rail, the motor is connected with power supply system.
Further, a transparent waterproof box is embedded in the riverbed, and the camera is arranged in the waterproof box.
Further, the water level meter adopts a pressure type water level meter.
Furthermore, the power supply system comprises a photovoltaic solar panel, a storage battery and a photovoltaic control device.
A method of measurement using an open channel flow measurement system, comprising the steps of:
s1: determining a functional relation v ═ f (h, v1 and v2) of a water level h, a rising speed v1 of bubbles and a forward speed v2 and a water speed v under a laboratory environment;
s2: reading the coordinates of the light source and determining the position of the measuring section;
s3: calibrating a camera and carrying out distortion correction;
s4: starting a bubble generator, and producing and scattering tracer particles;
s5: shooting a video by a camera and performing framing processing;
s6: after image preprocessing is finished, multi-frame continuous cross-correlation processing is adopted to obtain bubble motion information;
s7: the pressure type water level meter synchronously collects water level information;
s8: judging the water speed condition of the shooting area by combining v ═ f (h, v1, v 2);
s9: synchronously changing the positions of the laser light source and the bubble generator through the motor, and repeating the steps S2-S8 to obtain the flow velocity distribution conditions of water flow with different sections;
s10: the flow of the open channel is obtained by the integration of the area-flow velocity method.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the bubble is used as a tracer particle, is non-toxic and harmless, is easy to generate, reduces the measurement cost of the system, and increases the convenience and the measurement range of the system.
2. The shooting area can be changed along with the change of the positions of the laser and the bubble generator, the selection of the measuring area is more flexible, the calculation of the flow field area at any position can be completed, and compared with the traditional method for measuring the surface flow velocity, the accuracy of flow calculation can be effectively improved.
3. The cross-correlation function operation is realized by adopting a cross-correlation improved algorithm based on fast Fourier change, and the repeated calculation amount of cross-correlation can be reduced and the operation speed is improved by utilizing a window iteration reduction method. The improved multi-frame continuous cross-correlation algorithm is adopted to perform cross-correlation processing on continuous multi-frame images, and compared with a PIV method which only calculates two images, the method can reduce the error rate of flow field calculation.
4. Besides calculating the flow of the open channel, the system can identify abnormal conditions such as underwater pollutants, sewage discharge and the like by embedding an image processing program, and can also visually analyze a video image in a manual observation mode, so that the real-time monitoring of the underwater pollution is facilitated.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a bubble generator and laser arrangement according to an embodiment of the present invention;
FIG. 3 is a bubble profile of a section of an open channel taken in accordance with the present invention;
FIG. 4 is a vector diagram of the present invention for calculating the flow field using the piv of the bubble as the tracer particle;
fig. 5 is a flow chart of a measurement method implementation of the present invention.
In the figure: 1. a photovoltaic solar panel; 2. a stay bar; 3. a camera; 4. a waterproof box; 5. a bubble generator; 6. a support; 7. a laser; 8. a linear motor; 9. a pressure type water gauge; 11. an embedded single-chip microcomputer system; 12. a storage battery; 13. a photovoltaic control system.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
in the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1, an open channel flow measurement system based on underwater particle velocity measurement according to an embodiment of the present invention includes an underwater PIV measurement system, a water level measurement system, a data processing system, and a power supply system.
The underwater PIV measuring system comprises a camera 3, a waterproof box 4, a laser 7, a bubble generator 5, a support 6 and a linear motor 8 and is used for water flow shooting and flow velocity calculation in different areas.
The water level measuring system is a pressure type water level gauge 9.
The data processing system is an embedded single-chip microcomputer system 11, completes video processing and image processing, and completes flow calculation by combining water level information.
The power supply system comprises a photovoltaic solar panel 1, a storage battery 12 and a photovoltaic control device 13 and is used for supplying power to the whole system.
The measuring system of the invention should be installed at a position in the open channel where the shape is stable, the straight pipe section can be kept long and the underwater topography is smooth. Wherein, camera 3, waterproof box 4, laser instrument 7, bubble generator 5 equipartition are located under water among the PIV measurement system, and camera 3 places in waterproof box 4 and lean on the bank to arrange, eliminate the interference of camera 3 to the flow field under water, and waterproof box 4 is the transparent glass material, and the camera of being convenient for clearly shoots video under water. The photovoltaic solar panel 1, the storage battery 12, the photovoltaic control device 13 and the embedded single-chip microcomputer system 11 are arranged on a supporting rod on the bank side.
As shown in fig. 2, the present system utilizes a bubble generator 5 to generate a large number of bubbles, which are used as underwater tracer particles. A sheet-like light source is emitted to illuminate a plane under water, using a laser 7 as the light source. The laser 7 is mounted on the support and maintained in the same plane as the bubble generator 5, the bubble generator 5 being located upstream of the laser 7, and the bubbles being generated so as to pass through the plane illuminated by the laser. Linear motor 8 installs at the bottom, and support 6 installs on linear motor 8's slider, and linear motor 8 can drive support 6 along river width direction horizontal migration. The bubble generator 5 and the laser 7 move synchronously along the guide rail of the linear motor 8 under the driving of the linear motor 8, so that the camera can shoot any section (longitudinal section along the water flow direction) under water, and the shot section under water is as shown in fig. 3.
After the camera 3 finishes video image acquisition, the embedded single chip microcomputer 11 is used for image processing, identification of underwater colored pollutants can be carried out through writing in an image processing algorithm, meanwhile, the condition of an underwater shooting area can be observed manually in real time through a video window, and abnormal behaviors such as sewage stealing and discharging can be found in time. The cross-correlation function operation is realized by adopting a cross-correlation improved algorithm based on fast Fourier change, and the cross-correlation processing is carried out on continuous multi-frame images by utilizing a window continuous iteration reduction mode and an improved multi-frame continuous cross-correlation algorithm, so that the water flow velocity of the shot section is obtained as shown in figure 4. And calculating the flow by combining the water level information acquired by the pressure type water level meter, and transmitting the flow, the water level and the flow speed data to the remote monitoring equipment.
As shown in fig. 5, the specific flow of the system measurement is as follows:
s1: determining a functional relation v ═ f (h, v1 and v2) of a water level h, a rising speed v1 of bubbles and a forward speed v2 and a water speed v under a laboratory environment;
s2: reading the coordinates of the light source and determining the position of the measuring section;
s3: calibrating a camera and carrying out distortion correction;
s4: starting a bubble generator, and producing and scattering tracer particles;
s5: shooting a video by a camera and performing framing processing;
s6: after image preprocessing is finished, multi-frame continuous cross-correlation processing is adopted to obtain bubble motion information;
s7: the pressure type water level meter synchronously collects water level information;
s8: judging the water speed condition of the shooting area by combining v ═ f (h, v1, v 2);
s9: synchronously changing the positions of the laser light source and the bubble generator through the motor, and repeating the steps S2-S8 to obtain the flow velocity distribution conditions of water flow with different sections;
s10: the flow of the open channel is obtained by the integration of the area-flow velocity method.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention. While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (6)
1. The utility model provides an open channel flow measurement system based on particle is tested the speed under water which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the underwater PIV measuring system comprises a bubble generator arranged underwater, wherein a laser facing to the area above the bubble generator is arranged at the downstream of the bubble generator, and a camera facing to the area above the bubble generator is also arranged at one side of a river bed;
the water level measuring system comprises a water level meter and a water level measuring device, wherein the water level meter is used for measuring the water level;
the data processing system comprises an embedded single chip microcomputer and is used for finishing video processing and image processing and finishing flow calculation by combining water level information;
the power supply system is used for supplying power to the whole system, and the bubble generator, the laser camera, the water level meter and the data processing system are all connected with the power supply system;
and the remote monitoring equipment is used for receiving the processing data of the data processing system.
2. The open channel flow measurement system based on underwater particle velocity measurement according to claim 1, characterized in that: bubble generator and laser instrument install jointly on a support, sliding connection has the guide rail that the perpendicular rivers direction set up under the support, the motor can drive the support and slide on the guide rail, the motor is connected with power supply system.
3. The open channel flow measurement system based on underwater particle velocity measurement according to claim 1, characterized in that: a transparent waterproof box is embedded in the riverbed, and the camera is arranged in the waterproof box.
4. The open channel flow measurement system based on underwater particle velocity measurement according to claim 1, characterized in that: the water level meter adopts a pressure type water level meter.
5. The open channel flow measurement system based on underwater particle velocity measurement according to claim 1, characterized in that: the power supply system comprises a photovoltaic solar panel, a storage battery and a photovoltaic control device.
6. A method of measurement using the open channel flow measurement system of claims 1-5, characterized by: the method comprises the following steps:
s1: determining a functional relation v ═ f (h, v1 and v2) of a water level h, a rising speed v1 of bubbles and a forward speed v2 and a water speed v under a laboratory environment;
s2: reading the coordinates of the light source and determining the position of the measuring section;
s3: calibrating a camera and carrying out distortion correction;
s4: starting a bubble generator, and producing and scattering tracer particles;
s5: shooting a video by a camera and performing framing processing;
s6: after image preprocessing is finished, multi-frame continuous cross-correlation processing is adopted to obtain bubble motion information;
s7: the pressure type water level meter synchronously collects water level information;
s8: judging the water speed condition of the shooting area by combining v ═ f (h, v1, v 2);
s9: synchronously changing the positions of the laser light source and the bubble generator through the motor, and repeating the steps S2-S8 to obtain the flow velocity distribution conditions of water flow with different sections;
s10: the flow of the open channel is obtained by the integration of the area-flow velocity method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111136861.9A CN113720401A (en) | 2021-09-27 | 2021-09-27 | Open channel flow measurement system and method based on underwater particle velocity measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111136861.9A CN113720401A (en) | 2021-09-27 | 2021-09-27 | Open channel flow measurement system and method based on underwater particle velocity measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113720401A true CN113720401A (en) | 2021-11-30 |
Family
ID=78685133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111136861.9A Pending CN113720401A (en) | 2021-09-27 | 2021-09-27 | Open channel flow measurement system and method based on underwater particle velocity measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113720401A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414835A (en) * | 2022-01-26 | 2022-04-29 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Fixed ADCP flow measurement anti-interference data processing method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0429065A (en) * | 1990-05-24 | 1992-01-31 | Taisei Kiso Sekkei Kk | Running water speed measuring method |
| JPH0674797A (en) * | 1991-09-09 | 1994-03-18 | Kyowa Gijutsu Kk | Flow measuring method for river |
| WO1994024522A1 (en) * | 1993-04-22 | 1994-10-27 | Wolfgang Frey | Process, arrangement and device for determining the flow of an open-surfaced liquid |
| JPH08211087A (en) * | 1993-08-20 | 1996-08-20 | Hirobumi Onari | Device for analyzing visualized picture of flow |
| EP2034278A2 (en) * | 2007-09-04 | 2009-03-11 | Kölling, Christian | Method and device for determining the flow rate of flowing water |
| CN207456733U (en) * | 2017-12-01 | 2018-06-05 | 三峡大学 | Suitable for the flow field survey device in rectangle river |
| CN112362900A (en) * | 2020-10-30 | 2021-02-12 | 天地伟业技术有限公司 | Unattended water level flow velocity monitoring camera and monitoring method |
-
2021
- 2021-09-27 CN CN202111136861.9A patent/CN113720401A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0429065A (en) * | 1990-05-24 | 1992-01-31 | Taisei Kiso Sekkei Kk | Running water speed measuring method |
| JPH0674797A (en) * | 1991-09-09 | 1994-03-18 | Kyowa Gijutsu Kk | Flow measuring method for river |
| WO1994024522A1 (en) * | 1993-04-22 | 1994-10-27 | Wolfgang Frey | Process, arrangement and device for determining the flow of an open-surfaced liquid |
| JPH08211087A (en) * | 1993-08-20 | 1996-08-20 | Hirobumi Onari | Device for analyzing visualized picture of flow |
| EP2034278A2 (en) * | 2007-09-04 | 2009-03-11 | Kölling, Christian | Method and device for determining the flow rate of flowing water |
| CN207456733U (en) * | 2017-12-01 | 2018-06-05 | 三峡大学 | Suitable for the flow field survey device in rectangle river |
| CN112362900A (en) * | 2020-10-30 | 2021-02-12 | 天地伟业技术有限公司 | Unattended water level flow velocity monitoring camera and monitoring method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414835A (en) * | 2022-01-26 | 2022-04-29 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Fixed ADCP flow measurement anti-interference data processing method |
| CN114414835B (en) * | 2022-01-26 | 2023-08-22 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Fixed ADCP (automatic dependent control protocol) current measurement anti-interference data processing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103439230B (en) | Bubble parameter measurement method and device | |
| CN107632168B (en) | River channel two-dimensional flow velocity and flow measurement system and method | |
| CN207610835U (en) | Flow resistance force measuring device in a kind of wind tunnel test | |
| CN113124941B (en) | Non-contact type river channel flow measuring and accurate calculating method | |
| Elias et al. | Hydrodynamic validation of Delft3D with field measurements at Egmond | |
| CN108254032A (en) | River ultrasonic wave time difference method method of calculating flux | |
| CN108225717A (en) | Flow resistance force measuring method in a kind of wind tunnel test | |
| WO2020215458A1 (en) | Intelligent flow-field calculation method and system employing acoustic doppler current profiler | |
| US20050018882A1 (en) | Controlled surface wave image velocimetry | |
| CN104652347B (en) | Mountain area non-static water body water level affects population assessed in relation method with flooding | |
| CN103996171A (en) | Fluid motion vector estimation method based on space-time image | |
| CN109253765A (en) | River discharge monitors measuring system and method for calculating flux on-line | |
| CN108801584A (en) | Wave current flow velocity measuring system, water hole formula swimming machine system based on Laser Doppler speed and velocity correction method | |
| CN113155107A (en) | Irregular river channel section flow measuring device and method | |
| CN113720401A (en) | Open channel flow measurement system and method based on underwater particle velocity measurement | |
| Armenio et al. | Semi enclosed basin monitoring and analysis of meteo, wave, tide and current data: Sea monitoring | |
| CN104729445A (en) | Estuary dam geometrical morphology measuring method | |
| CN111060427B (en) | Self-stabilizing high-precision sediment bed load measuring system and method | |
| CN102288646A (en) | Automatic in-situ monitoring method and system for vertical distribution of concentration of sediment in seawater | |
| CN114112549B (en) | Method for online analyzing and predicting groundwater water quality change | |
| CN204514954U (en) | The device of river course two dimension fluid-velocity survey and acquisition river cross-section | |
| CN109165478A (en) | A kind of river silt clearing amount calculation method | |
| CN108037051B (en) | Intelligent cleaning type sand measuring device and method | |
| CN210802846U (en) | Wave flow velocity measurement system based on laser Doppler velocity measurement and water tunnel type swimming machine system | |
| CN215066606U (en) | Open-air hydrodynamic force-topography-synchronous measurement integrated device of quality of water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |