63 results about "Discharge measurements" patented technology

The invention provides a channel flow inversion method, and relates to the technical field of hydrology, water resources and hydraulic engineering, and the method comprises the steps: debugging a calculation case through computational fluid mechanics software OpenFOAM; using scripts to copy and modify the calculated case river channel parameters in batches; calling computational fluid mechanics software OpenFOAM in a script mode to solve all calculation cases in batches, and calculating a simulation structure to construct a data set; constructing a deep learning model based on the data set; training the deep learning model; and reading section time-average flow velocity distribution from the flow velocity distribution cloud picture, and performing channel flow inversion by using the trained deep learning model. The open channel flow measuring method solves the problems that an existing open channel flow measuring method is low in precision, high in cost, limited in application range and the like, and rapid and accurate measurement of the open channel flow is achieved.

The invention discloses a gas-liquid two-phase flow measurement method based on a bent pipe and an acoustic emission technology, and belongs to the field of gas-liquid two-phase flow measurement. The method comprises the steps that the average liquid holdup HL of two-phase flow in a pipeline is measured, and the instantaneous speed Vc of a gas phase and a liquid phase passing through the 45-degree section of the bent pipe is calculated; identifying a gas-liquid two-phase flow pattern in the pipeline; taking the Vc, the HL, the apparent liquid velocity VSL and the apparent gas velocity VSG as variables, and adopting a dimensional analysis method to propose a correlation between the Vc and the VSL and between the HL and the VSL and between the VSL and the VSG according to different flow patterns; calculating an effective voltage value RMS of the acoustic emission signal, and establishing a correlation between the RMS and the VSL and VSG; fitting parameters in the correlation formula; newly collected Vc, HL and RMS are input into the fitted correlation formula, VSL and VSG are output, and therefore measurement of the gas-liquid two-phase flow is completed. Compared with a single-phase metering method after separation commonly used in the oil and gas industry, the device has the advantages of being simple in structure, low in measurement cost, capable of achieving real-time measurement, non-invasive and the like.

The invention discloses a pipeline flow measurement method and device for a non-full-flow pipeline, and relates to the technical field of pipeline flow measurement, measurement is carried out through a pipeline flow measurement system, and the pipeline flow measurement system comprises a sonar probe which is arranged in the pipeline and floats on the water surface of the pipeline and a Doppler flow meter which is arranged in a water passing area in the pipeline. The method comprises the steps that a target echo signal, detected by a sonar probe, of a water passing area in a pipeline is acquired, and section contour data and section area of the water passing area are determined according to the target echo signal; performing grid division on the water passing area according to the section contour data to obtain a preset number of grid units, and calculating flow velocity distribution of each grid unit through frequency shift detected by a Doppler flow velocity meter; on each grid unit, the corresponding flow velocity value is multiplied by the area of the grid unit according to the flow velocity distribution, and then summation is carried out to obtain the pipeline flow. The problem that in the prior art, the accuracy is low when the pipeline flow of the non-full-flow pipeline is measured is solved.

The embodiment of the invention provides a flow measuring device, method and equipment for a drainage pipeline and a medium, and relates to the technical field of drainage pipelines. The device comprises a first fixing unit, a flow detection unit and a lifting unit, the first fixing unit is fixedly arranged in an inspection well of the drainage pipeline, the flow detection unit and the second fixing unit are both fixedly connected with the first fixing unit, and the bottoms of the flow detection unit and the first fixing unit are located on the same plane; the flow detection unit is used for determining the water flow velocity and the water flow of water in the drainage pipeline. The method comprises the following steps: determining a water body flow velocity and an offset parameter detected by a flow detection unit and a rotation parameter corresponding to a lifting unit; and performing offset compensation processing on the water body flow velocity based on the offset parameter to determine the water body flow of the water body in the drainage pipeline. The precision and stability of flow measurement of the drainage pipeline are improved.

An object of the present invention is to provide a flow velocity measuring system in which a sensor is not in contact with water and which can measure a flow velocity of water with a simple configuration. Another object of the present invention is to provide a novel flow rate measurement system capable of measuring a flow rate of water based on the flow velocity.SOLUTION: The flow velocity measuring system includes a drainage pipe, a distance sensor, and a measuring unit, the drainage pipe being capable of discharging water from a water discharge port in a horizontal direction, the distance sensor being disposed at an arbitrary position facing the water discharge port at a horizontal distance D and a vertical distance Y from the water discharge port and being capable of detecting a horizontal distance Xo from the water discharge port to water, the measurement means is capable of measuring the flow velocity Vo of the water discharged from the water discharge port from Xo, D, Y, and the gravitational acceleration g.SELECTED DRAWING: Figure 1

The invention provides a self-adaptive dual-mode flow metering device and method for a riverway ecological water replenishing recharge well, and relates to the technical field of hydrological monitoring. The device monitors the water level in the well in real time by arranging a second water level sensor, and a control unit intelligently judges whether the current recharge working condition is a water falling working condition or a full pipe flow working condition according to the water level information; further, a volume method or a flow velocity method is autonomously selected for flow measurement, and continuous, accurate and automatic monitoring of the flow under the full-working-condition operation condition of the recharge well is achieved; under the water drop working condition, the electric on-off valve is closed to accumulate water flow in the cylindrical measuring cylinder, and the average flow is calculated based on the water level in the cylinder measured by the first water level sensor; under the full pipe flow working condition, the valve is kept open, and the instantaneous flow is calculated based on the section average flow velocity measured by the Doppler flow meter; and due to automatic switching of the two modes, the reliability and adaptability of flow monitoring of the recharge well in a complex dynamic environment are remarkably improved.

This water meter comprises: a flow rate measurement unit for measuring the flow rate of water; a pattern information acquisition unit for acquiring use pattern information that is information indicating a usage flow rate of water for each time band on the basis of a measurement result obtained by the flow rate measurement unit; a zero time band information acquisition unit for acquiring, as zero time band information, information pertaining to a time band in which the flow rate becomes zero on each day constituting a prescribed period on the basis of the use pattern information; a zero continuation period information acquisition unit for acquiring, as zero continuation period information, information pertaining to a time band in which the flow rate becomes zero over all days in the prescribed period from the acquired zero time band information; a determination unit that determines a water leakage assessment time band on a day on the basis of the zero continuation period information; and a discernment unit that identifies whether the flow rate measured by the flow rate measurement unit in the water leakage assessment time band is zero, and discerns that there is water leakage in cases where the flow rate is not zero.

The present application relates to sewage treatment technical field, specifically to a kind of weir gate water flow measurement method.The method measures the liquid level before weir gate, flow rate, the opening height of weir gate and the flow rate after water flow through weir gate, by measuring these more accurate data, avoid the flow rate of directly measuring weir gate water flow in traditional measurement, due to the existence of liquid level collapse and flow rate fluctuation, inaccurate condition, and these accurate data are calculated, more accurate measurement results can be obtained.The method of the present application overcomes the limitation that the traditional flow measurement must be straight inlet channel, can be applied to the application scene that water flow inlet channel has no straight pipe section and water flow changes greatly, has wide application range, compared with traditional measurement method, measurement error is reduced from about 20% to about 5%, greatly improves the precision of measurement, has important guiding significance for subsequent process control and reagent dosage in sewage treatment process.

The present invention discloses a flow measurement method and system under complex water flow conditions, the method comprising the following steps: according to the flow measurement section position, determine the three-dimensional hydrodynamic model modeling area and the model inlet and outlet positions and verification positions, and establish a three-dimensional hydrodynamic model; use image recognition technology to obtain the water level, surface velocity and boundary section flow data of the boundary section and the verification position; perform parameter calibration and verification on the established three-dimensional hydrodynamic model; use the three-dimensional hydrodynamic model for simulation to obtain the flow of the measurement section; use the measurement section flow as output to construct an LSTM artificial intelligence model and a model training set and a test set, train the LSTM model algorithm, use the trained LSTM model for rapid calculation, and obtain real-time flow measurement data. The present invention solves the problems of no stable corresponding relationship between water level and flow under complex water flow conditions, inaccurate estimation of cross-sectional area using a single water level value for non-planar water surfaces, and provides a rapid calculation method for flow.

An irregular river channel cross-section flow measurement device and method, comprising a computer, a signal receiver, a left support and a right support. The left support and the right support are respectively arranged on the left and right sides of the river channel. A cable is provided between the left support and the right support, and the cable is perpendicular to the river water flow direction. A rotary connection seat for fixedly installing a sonic depth finder is fixedly arranged on the cable, or a movable pulley assembly for fixedly connecting a sonic depth finder and a radar speedometer is slidably arranged on the cable. The sonic depth finder and the radar speedometer transmit signals to the signal receiver through wireless communication, and the signal receiver is communicatively connected to the computer. The principle of the present invention is scientific and the operation is convenient. By using the rotary connection seat in cooperation with the sonic depth finder, the small-scale concave and convex conditions of the river channel cross-section can be better understood, and the river channel cross-section can be correctly simulated according to the angle and distance, and the test data is more accurate.

This invention discloses a device and method for measuring river flow in a run-of-river hydropower station. The invention employs an active measurement method using pumping backflush to reduce the influence of sediment and other media on flow velocity measurement. Simultaneously, it incorporates river slope into the flow velocity measurement process to obtain the true river velocity, and based on this, derives the river's average velocity. Then, by constructing a river cross-sectional function, the average cross-sectional area of ​​the river from the reservoir's starting point to the measurement point is obtained, thus reducing the impact of river irregularities on flow measurement. Finally, based on the average velocity and average cross-sectional area, the true river flow can be calculated. Therefore, this invention solves the problems of uneven instantaneous flow velocity, river slope, and river irregularities on flow measurement, thereby improving the accuracy of natural flow velocity and flow measurement in run-of-river hydropower stations. Therefore, it is highly suitable for large-scale application and promotion.

This application relates to an adaptive correction method and system for flow measurement parameters in approximate standard open channels. The method constructs a basic flow model based on the target channel design parameters, and calculates the theoretical basic flow based on water depth and water level difference. Under different operating conditions, water depth, water level difference, and corresponding high-precision reference flow are collected to obtain the theoretical basic flow. The channel is then divided into several water depth intervals according to the water depth range, and a dynamic correction function for each interval is fitted based on the calibration data of each interval. During operation, real-time water depth and water level difference are collected, and the real-time theoretical basic flow is obtained using the basic flow model. Then, the target interval is selected according to the current water depth, and the corresponding dynamic correction function is called for correction to obtain the actual flow, which is then output. This application effectively reduces the system deviation between the theoretical model and actual operating conditions without increasing the complexity of hardware, achieving high-precision flow measurement under different water depths and water level differences, and improving the accuracy and applicability of flow measurement.

The invention discloses an automatic flow measurement method and system for a straight opening section of a trunk canal, and belongs to the field of big data analysis and mining, and the method comprises the following steps: constructing a uniformity index, and selecting a flow velocity calculation method according to an index value; monitoring the sand content dynamic correction roughness in real time, and iteratively calculating the correction flow velocity; the method comprises the following steps of: calculating initial flow rate according to a corrected flow rate and a real-time section area by combining and analyzing a spiral flow risk, checking and verifying, correcting an influence value by superposing a spiral flow correction coefficient, and outputting final corrected flow rate. High precision and intelligentization of main canal flow velocity and flow measurement are achieved, spiral flow parameters are associated with a first factor of uniformity, spiral flow risks are judged through double standards, possible deviation caused by single parameter judgment is reduced, meanwhile, manual intervention is reduced, flow measurement efficiency and stability are improved, and a solid foundation is laid for subsequent analysis and system optimization.

This application relates to the field of flow measurement technology, specifically to a bridge-type flow measurement method, device, and system based on real-time water level triggering. The method includes: acquiring the water level at a flow monitoring point in real time and determining whether a measurement command is triggered; when triggered, acquiring echo signals from multiple measurements; based on the significance of local peaks, signal strength, irregularity, bandwidth in the frequency domain, and high-frequency energy attenuation of the echo signals from each measurement, and combined with the difference between the frequency of the echo signals and the frequency of the transmitted signals, constructing usable coefficients for each measurement; thereby filtering usable signals from all echo signals after the current measurement command is triggered, and calculating the river flow at the flow monitoring point at the time the measurement command is triggered. This application improves the accuracy of river flow measurement by filtering echo signals containing more river flow information from all measurement echo signals.

The application provides a sensor-based water level and flow data processing method and system, relates to the technical field of hydrological monitoring data processing, integrates water level data, flow velocity profile data, acoustic echo feature data and water turbidity data, determines that the water body is in a high turbidity state when the water turbidity is continuously higher than a preset threshold and the water level and flow velocity change amplitude is low, deeply analyzes the acoustic echo feature data, and generates a reliability score of the flow velocity data of each depth layer in the flow velocity profile. The reliability score is used for weighted processing of the flow velocity data, low reliability data is corrected or replaced, and finally the cross-section average flow velocity is calculated based on the weighted processed flow velocity data, and the instantaneous flow is obtained by combining the cross-section area. The application overcomes the defects of data processing logic modularization and lack of cross-sensor data cross-validation in the prior art, and significantly improves the flow measurement accuracy and reliability of the hydrological monitoring system under complex water quality conditions.

The invention discloses a water conservancy project flow intelligent measuring method, and belongs to the technical field of water conservancy projects. A hydraulic engineering flow intelligent measuring method comprises the following steps that S1, flow measuring equipment abuts against the end of a pipeline, and the flow measuring equipment and the central axis of the pipeline are located on the same axis; s2, the flow measuring equipment is assembled at the end of the pipeline, and the joint of the flow measuring equipment and the pipeline is sealed; s3, measuring the amount of water flowing at the end part of the pipeline by using an intelligent flow meter in the flow measurement equipment; the flow measuring device can be stably installed at the end of the pipeline, it is guaranteed that the joint of the pipeline port and the flow measuring device is sealed, and the accuracy of the flow measuring result is improved.

The invention discloses a water conservancy flood control pipeline flow measurement method based on image recognition and multi-source perception. According to the method, an intelligent data fusion algorithm is adopted, the problems of overflowing area errors and uneven flow velocity distribution caused by sedimentation are dynamically corrected, and the precision, reliability and environmental adaptability of flow measurement of the drainage pipeline under the complex working condition are remarkably improved. In the whole measurement process, no personnel need to enter the pipeline, and effective technical equipment is provided for urban flood control and intelligent management of a drainage pipe network.

The invention discloses a river flow measurement method based on satellite-borne SAR along-track interference, and relates to the technical field of river flow measurement. Comprising the following steps: S1, selecting a straight and along-track vertical river reach of a to-be-measured river as a flow measurement area, and obtaining a satellite-borne SAR along-track interference image of the flow measurement area, the cross section terrain of the flow measurement area and the water level; s2, calculating an interference phase of a river measurement area according to the satellite-borne SAR along-track interference image in the S1, and performing inversion calculation by using the interference phase of the river measurement area to obtain a river surface flow velocity of a flow measurement area; and S3, determining flow velocities of different areas on the cross section of the flow measurement area according to a cross section vertical flow velocity distribution rule on the basis of the cross section terrain and water level of the flow measurement area obtained in S1 and the surface flow velocity of the flow measurement area obtained in S2, and calculating the cross section flow of the flow measurement area so as to obtain the flow of the to-be-measured river. According to the invention, large-range, long-period and all-weather river flow measurement can be realized.

The method, device and storage medium for correcting the influence of sediment concentration on open channel flow measurement accuracy provided by the present disclosure comprise: synchronously measuring the flow of a reference flow measurement device and an open channel flow measurement device to be detected under different flow measurement conditions, wherein the parameters of the flow measurement conditions at least include the sediment concentration; taking the flow measurement value of the reference flow measurement device as the true value, dividing the flow measurement value of the open channel flow measurement device to calculate the flow correction coefficient of the open channel flow measurement device under different flow measurement conditions; taking the parameters of the flow measurement conditions as the independent variable to obtain a function expression of the flow correction coefficient; substituting the parameters of the flow measurement conditions of the water body to be detected into the function expression to obtain the flow correction coefficient under the actual flow measurement conditions, and multiplying the flow measurement value of the open channel flow measurement device by the flow correction coefficient to obtain the flow correction value of the open channel flow measurement device. The present disclosure weakens the trend influence of the sediment concentration on the flow measurement accuracy of the device, and improves the adaptability of the device in the flow measurement of the sediment-laden water flow.

The invention relates to the technical field of riverway water level monitoring, in particular to a riverway flow direction and flow monitoring device and a monitoring method thereof.The monitoring device comprises a connecting part, a flow direction monitoring mechanism and a flow measuring mechanism, one end of the connecting part is installed on a dam of a riverway, and the flow direction monitoring mechanism and the flow measuring mechanism are both installed at the other end of the connecting part; the flow measuring mechanism is located under the flow direction monitoring mechanism, the flow direction monitoring mechanism is in sliding connection with the connecting part, the flow measuring mechanism is connected with the connecting part, the flow direction monitoring mechanism comprises a guiding part, a supporting part and two suspension balls, the guiding part is in sliding connection with the other end of the connecting part, the supporting part is installed on the guiding part, and the two suspension balls are arranged on the supporting part. The two suspension balls are located on the two sides of the supporting part correspondingly, and the suspension balls are slidably connected with the guiding part. The flow direction of the river channel is monitored through the flow direction monitoring mechanism, the flow of the flow measurement section of the river channel is monitored through the flow measurement mechanism, and the monitoring efficiency of the flow direction and the flow of the river channel can be improved.

The invention relates to the technical field of flow measurement, in particular to a natural water area water flow measurement device which comprises an underwater measurement part, a water surface measurement part, a data transfer part, a water surface platform and a wind speed detection part. The underwater measuring part is used for collecting underwater undercurrent flow; the water surface measuring part is used for collecting water flow on the water surface; and the data transfer part is arranged between the underwater measurement part and the water surface measurement part and is used for receiving measurement data of the underwater measurement part and the water surface measurement part. When in use, the underwater measuring part and the water surface measuring part are respectively arranged to measure the underwater water flow and the water surface water flow, and the data transfer part transmits the measured data to the water surface platform, so that statistical personnel can evaluate the pollutant load state by combining the water surface data and the underwater undercurrent data; the effect of improving the accuracy of water flow measurement data is achieved.

The invention relates to the technical field of flow measurement, and discloses a flow measuring device and method suitable for small ditches, comprising a device body, the top of the device body is connected with a water pumping device, the lower part of the water pumping device is connected with a speed measuring tube, the side of the device body is connected with a laser range finder, and one side of the front of the device body is provided with scales. The speed measuring tube is clamped beside the scale of the device body, and the tail end of the speed measuring tube is bent towards the scale direction. Compared with a propeller / rotating cup type flow meter which is widely used at present, the device is a flow measurement tool developed according to the hydraulic Bernoulli principle, the structure is simple, no complex mechanical and electronic structure exists, the manufacturing and later maintenance cost is reduced, the flow velocity and the water channel section can be measured at the same time through the device, the field flow measurement efficiency is improved, and the device is suitable for popularization and application. The flow measurement duration is shortened, and the flow measurement timeliness is ensured.

The present disclosure provides a method (400) and a system (210) for correcting flowrate measurements of a flowmeter (130). The method comprises receiving at least one of flow' distorting parameters, flowmeter physical and operational parameters, a current flowrate value measured by the flowmeter, and fluid physical properties. Hie method may further comprise determining a flow' regime based on the current flowrate value; and selecting at least one flow equation based on the determined flow regime. The method may further comprise computing an output signal based on the selected flow equation and at least one of electromagnetic equations and / or physics-based equations, the flow distorting parameters, the flowmeter physical and operational parameters, and the fluid physical properties. The method may further comprise determining a corrected calibration factor using the computed output signal and the current flowrate value and transmitting the corrected calibration factor for correcting flowrate measurement of the flowmeter.

The invention relates to the technical field of energy dissipation noses, in particular to a flip bucket applied to the tail end of a spillway. The spillway structure comprises a spillway, and an energy dissipation nose piece is arranged at the tail end of the spillway. According to the energy dissipation nose ridge piece, the structural design of the energy dissipation nose ridge piece is optimized, particularly, the reverse arc guide structure and the corner structure are reasonably arranged, so that the morphological characteristics, speed distribution and the emergent angle of discharged water flow can be more effectively regulated and controlled, and the accurate water flow control mode enables high-speed water flow to form a more uniform flow state when leaving the nose ridge; and the water is cast to a downstream energy dissipation area at a set angle (25-35 degrees), so that the energy dissipation efficiency is improved, the scouring strength to a downstream riverbed and a bank slope is reduced, the depth of a scouring pit is remarkably reduced, and the engineering operation safety is guaranteed. Meanwhile, the measurement assemblies are arranged on a plurality of water depth and flow velocity measurement sections, and the high-precision flow measurement function of the measuring weir constructs a complete hydraulic element monitoring matrix.

A water meter is provided with: a measurement flow path (10) through which water, which is a fluid to be measured, flows; a flow rate measurement unit (21) that measures the instantaneous flow rate of water flowing through the measurement flow path (10); a flow rate pattern storage unit (24) that stores a first flow rate pattern indicating the change over time of the measurement value when the flow rate is zero; a water leakage determination unit (25) that determines the presence or absence of water leakage on the basis of a second flow rate pattern indicating the change over time of the measurement value obtained by the flow rate measurement unit (21) and the first flow rate pattern stored in the flow rate pattern storage unit (24); a display unit (26) that displays predetermined information when the water leakage determination unit (25) determines that there is a water leakage; and a meter communication unit (27) for notifying a center device (80) that manages the water leakage of the occurrence of the water leakage.

The application relates to the technical field of intelligent water monitoring, and discloses a flow measurement data verification method based on abnormal water use analysis, which comprises the following steps: deploying an intelligent sensor network comprising a flow meter, a pressure gauge and a thermometer, collecting multi-source data of abnormal water flow state and performing phase-amplitude decoupling processing to generate a feature matrix containing flow state correlation information; establishing a multi-layer probability field model, converting error components into measurement error probability clouds, constructing an error back propagation path and designing cascade compensation parameters; correcting the probability clouds by using a gradient optimization algorithm, combining deep learning technology to enhance the probability convergence field and determining a standard flow value; tracking and analyzing the error propagation link and the attenuation coefficient spectrum to establish an error convergence boundary and output a flow correction result; and finally combining environmental state detection to construct an abnormal verification feature spectrum, completing comprehensive verification of the flow measurement data, effectively improving the detection accuracy of the abnormal water flow state, and improving the accuracy and reliability of flow measurement.

The present invention provides a device for measuring river runoff, comprising: a frame body; a telescopic rod assembly, the first end of the telescopic rod assembly is rotatably connected to the frame body, and the telescopic rod assembly includes a first rod body and a second rod body; a guiding part, arranged on the telescopic rod assembly; a wire body, the first end of the wire body is connected to the telescopic rod assembly; a driving assembly, the second end of the wire body is arranged on the driving assembly; a measuring piece, arranged on the driving assembly, and the measuring piece is used for measuring the length of the wire body extending out of the driving assembly; a rangefinder, arranged on the frame body; and a flowmeter, arranged on the telescopic rod assembly. When the second end of the telescopic rod assembly abuts against the river bottom, the elongation length of the wire body is measured by the measuring piece, so that the length of the side of the river bed can be obtained. The width of the river bank is measured by the rangefinder. After obtaining the lengths of the sides of the inverted trapezoid, the cross-sectional area of the river bed can be calculated. Then, the flow velocity of the river is measured by the flowmeter, and the river runoff is obtained by multiplying the cross-sectional area of the river bed by the flow velocity of the river.

The present invention discloses a control method and system for a track-type cross-section flow measuring device, which defines the points to be measured in each flow measuring area according to each flow measuring area and the location of the track-type cross-section flow measuring device, thereby ensuring the accuracy of the points to be measured in each flow measuring area. Furthermore, the movement of the non-contact radar water level meter is triggered according to the measurement path, and when the non-contact radar water level meter reaches the point to be measured, the flow velocity of each point to be measured is collected based on the non-contact radar water level meter; multiple flow velocity combinations are constructed based on multiple flow velocities, non-contact radar water level meters, and water flow paths, and corresponding abnormal flow velocities are defined based on the synchronous detection of multiple flow velocity combinations, and corresponding optimization logic is triggered based on the abnormal flow velocity, the corresponding point to be measured, and the non-contact radar water level meter to achieve online optimization of the abnormal flow velocity, thereby ensuring the accuracy of multiple flow velocities, and further ensuring the measurement accuracy of the flow velocity by the track-type cross-section flow measuring device.