50 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.

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.

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 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 application discloses a parameter fusion flow measuring method and device of a multi-channel ultrasonic time difference method flowmeter, relates to the river flow monitoring field, and comprises the following steps: acquiring the receiving time, water temperature, sand content index, near-shore propeller flow velocity and actual water level collected by an ultrasonic transducer; acquiring irregular flow cross-section data and area-water level relationship calculation; adjusting the working frequency of the ultrasonic transducer in real time according to the sand content index, so as to ensure that the sound path is in a normal working state; establishing different water level flow velocity calculation models, calculating the average flow velocity of each sound path representative layer at different water levels, and improving the average flow velocity accuracy; combining the area-water level equation, calculating the flow area of each sound path representative layer, finally calculating the flow of all sound path representative layers, and accumulating the river channel average flow. The application greatly improves the flow velocity, flow measurement precision and reliability in irregular, large cross-section and deep river water areas through real-time detection of the parameters and multi-parameter fusion calculation.

The invention discloses a silt grading and concentration real-time online monitoring device, and belongs to the technical field of water quality monitoring. Aiming at the problems of long time consumption, insufficient precision and poor representativeness of the existing sediment measurement method, a multi-point water level diversion sampling device is adopted to collect water samples from different depths and positions, and the sampling representativeness is ensured in cooperation with a flow velocity sensor; setting a sapphire glass detection window to maintain optical clarity; dynamically adjusting laser power through a laser scattering particle size analysis system and calculating particle size distribution based on a Mie scattering theory; monitoring the flow in real time by using a flow measurement module, and synchronously calculating the concentration in combination with scattering data; an automatic cleaning function module is configured to remove attachments, and an environment adaptation protection module provides anti-abrasion and anti-pollution protection. The real-time online monitoring of sediment grading and concentration is realized, and the method is suitable for water quality monitoring, equipment efficiency evaluation and environmental protection in the fields of hydroelectric generation, water supply systems, sewage treatment plants and environmental monitoring.

The application discloses a pipeline flow measurement method and system and a storage medium. The pipeline flow measurement method comprises the following steps: obtaining the water level height of the liquid surface in a sewer pipeline; judging whether the water level height is greater than a preset value; when the water level height is less than the preset value, using a non-contact measurement method to measure the actual water level height and the water flow velocity, and when the water level height is greater than the preset value, using a contact measurement method; and calculating the pipeline flow of the sewer pipeline according to the actual water level height and the water flow velocity. In the foregoing manner, the water level height of the liquid surface in the sewer pipeline is first obtained, and a non-contact measurement method is used, so that the influence of the water quality, silt and garbage in the sewer pipeline can be effectively avoided, the water level height of the liquid surface is judged, and different measurement methods are adopted for the full-pipeline state when the water level height is greater than the preset value and the non-full-pipeline state when the water level height is less than the preset value, so that the accuracy of the measurement of the water level height of the liquid surface in the sewer pipeline and the water flow velocity is improved.

The application discloses a kind of based on Doppler flow velocity profiler multilayer sediment sound signal attenuation correction's bed load sediment transport rate measurement method, comprising: in the floodplain area of the river reach to be measured, the bed surface of sediment is sampled, and the bed material gradation is measured, and the median size of bed sand is obtained;Obtain flow data, and extract ship speed data from flow data;According to ship speed data, calculate riverbed movement speed;Filter riverbed movement speed data, and calculate the eigenvalue of filtered riverbed movement speed data;According to the eigenvalue of filtered riverbed movement speed data, respectively calculate bed load vertical projection area ratio;According to bed sand median size, calculate dimensionless sediment particle size;According to dimensionless sediment particle size, calculate bed load layer thickness;According to bed load vertical projection area ratio and bed load layer thickness, calculate bed load volume concentration;According to bed load volume concentration, calculate multilayer sediment sound signal attenuation correction coefficient;According to multilayer sediment sound signal attenuation correction coefficient, calculate bed load sediment transport rate.The application accurately and effectively measures bed load sediment transport rate.

This invention discloses a verification method and apparatus for a flow measurement system. The verification method includes the following steps: a flow-transfer system delivers water to the flow measurement system according to a preset water delivery value; real-time measurement values ​​of the flow meters in the flow measurement system are obtained; the preset water delivery value is compared with the real-time measurement values ​​to obtain a comparison verification result. The technical solution of this invention allows the flow-transfer system to directly deliver water to the flow measurement system, enabling the rapid establishment of a stable water delivery flow rate to verify the flow measurement system during the verification process, thus shortening the verification cycle.

The invention relates to the technical field of intelligent water affair monitoring, and discloses a flow measurement data verification method based on abnormal water consumption analysis, and the method comprises the steps: collecting the multi-source data of an abnormal water flow state through deploying an intelligent sensor network comprising a flowmeter, a pressure gauge and a thermometer, and carrying out the phase-amplitude decoupling processing; generating a feature matrix containing flow state association information; establishing a multilayer probability field model, converting an error component into a measurement error probability cloud, constructing an error back propagation path and designing a cascade compensation parameter; correcting the probability cloud by adopting a gradient optimization algorithm, enhancing a probability convergence field in combination with a deep learning technology, and determining a standard traffic value; establishing an error convergence boundary and outputting a flow correction result through error propagation link tracking and attenuation coefficient spectrum analysis; and finally, an abnormal verification characteristic spectrum is constructed in combination with environment state detection, comprehensive verification of flow measurement data is completed, the detection precision of the abnormal water flow state is effectively improved, and the accuracy and reliability of flow measurement are improved.

The application belongs to the technical field of water flow velocity measurement, and provides a water surface flow velocity measurement method under severe weather conditions, which comprises a first radio frequency chip and a second radio frequency chip, the first radio frequency chip emits a first electromagnetic wave to the water surface and receives a return signal of the first electromagnetic wave reflected by the water surface, the second radio frequency chip emits a second electromagnetic wave to the unobstructed sky and receives a return signal of the second electromagnetic wave, a master control chip uses the return signal of the second electromagnetic wave as a local oscillator signal of the first electromagnetic wave, performs frequency mixing, and obtains a Doppler frequency shift signal of the first electromagnetic wave with respect to the water surface after low-pass filtering, so as to obtain flow velocity information of the water surface. The method can improve the accuracy and reliability of the millimeter wave radar flow meter in wind and rainy weather conditions, reduce the influence of wind and rain on the millimeter wave radar flow velocity and flow measurement, and according to the method, a device is designed, which can measure real water flow velocity data.