Water taking metering method and system for self-flowing type water taking pipeline

Abstract

The invention discloses a self-flowing type water taking pipeline water taking metering method and system. A water taking head water taking pipeline related design scheme is obtained through investigation, parameters such as pipeline materials, pipeline diameter, elevation and pipeline arrangement are sorted, a simulation range is determined, a normal model is designed according to a gravity similarity criterion, and physical model design and manufacturing are carried out in a laboratory; a scaling scale is determined, a model test is carried out through the model, a flow-tracing ball conveying speed relation curve is drawn, and a flow-tracing ball conveying speed relation expression is deduced; the front-section water taking amount test and the tail-end water taking amount test of the water taking pipeline are carried out, and the leakage water amount and the leakage rate of the self-flowing type water taking pipeline are obtained through calculation; and the water taking amount of the self-flowing type water taking pipeline is calculated through parameters such as a water taking pipeline tail end metering facility and a water taking pipeline leakage rate. The water taking amount of the self-flowing type water taking pipeline can be efficiently and accurately calculated, and the metering problem under the condition of lacking of a water taking metering device is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water intake measurement and analysis, and more particularly to a self-flowing water intake pipeline water intake measurement method and system. BACKGROUND

[0002] Water intake measurement refers to accurately measuring and recording water intake through scientific means, which is an important means of sustainable utilization of water resources. The measurement facility of an enterprise is the "eyes" and "ruler" for the enterprise to carry out water saving work. Through quantifying water consumption data and identifying abnormal consumption, the process flow is optimized, water saving technical transformation is supported, and ultimately the goal of "measuring, calculating, managing and saving" is achieved, helping the enterprise to green and low-carbon transformation.

[0003] According to the "Water Intake Measurement Technical Guidelines (GB / T 28714-2023)", "water intake units or individuals shall be classified and graded according to water source, water use, water scale, etc. and equipped with corresponding water intake measurement facilities (devices)", "the front straight pipe section of the pipeline flow meter installation position should be greater than 10 times the pipe diameter, and the rear straight pipe section should be greater than 5 times the pipe diameter". The water intake head is the first water use unit of an industrial enterprise, including the process of pumping water by the water intake pump station and transporting water by the raw water pipe to the industrial enterprise. However, due to the early construction of some enterprises, the existing measurement facilities are not installed at the water intake head, and there is no position reserved for adding water intake measurement, resulting in deviation in water intake statistics, which cannot meet the requirements of water use regulation, water intake plan management, water resources fee (tax) collection, water saving management, water use statistical investigation, etc. Therefore, for industrial enterprises that use self-flowing water intake pipelines for water intake and cannot install measurement equipment, how to effectively and reasonably calculate the water intake of the water intake head still needs in-depth and detailed research. SUMMARY

[0004] The present application overcomes the defects of the prior art, and provides a self-flowing water intake pipeline water intake metering method and system. Through investigation, relevant design schemes of the water intake head pipeline are obtained, and pipeline materials, pipe diameter, elevation, pipeline layout and other parameters are sorted out; the simulation range is determined, and a normal model is designed according to the gravity similarity criterion; physical model design and production are carried out in the laboratory; the physical model is calibrated and verified, and the scaling scale of each parameter is calculated according to the similarity criterion; model test is carried out through the model, the flow-tracer ball body transport velocity relationship curve is drawn, and the flow-tracer ball body transport velocity relationship formula is derived; the water intake of the front section of the water intake pipeline is tested, the tracer ball body is tested on site, and the water intake flow of the water intake head during the test period is calculated and analyzed combined with the flow-tracer ball body transport velocity relationship formula; the water intake of the end of the water intake pipeline is tested, and the water intake of the end of the water intake pipeline during the test period is measured through the metering facility; the leakage water quantity and leakage rate of the self-flowing water intake pipeline are analyzed and calculated; and the water intake quantity of the self-flowing water intake pipeline is calculated through the metering facility at the end of the water intake pipeline, the leakage rate of the water intake pipeline and other parameters. The present application can efficiently and accurately calculate the water intake quantity of the self-flowing water intake pipeline, and solve the metering problem under the condition of lacking water intake metering devices.

[0005] The present application provides a self-flowing water intake pipeline water intake metering method in the first aspect, comprising: S1: collate the water intake head pipeline situation, determine the water source, obtain the water surface elevation of the water source, the top elevation of the water intake, the bottom elevation of the water intake, the submerged water depth of the water intake, the length of the water intake pipeline, the inner diameter of the water intake pipeline, the slope of the water intake pipeline, the bottom elevation of the outlet, the installation position of the existing metering facility of the pipeline, the installation quantity, the calibration situation, and the water intake pipeline design drawing; S2: determine whether the water intake pipeline has the condition of installing the metering facility, if the installation condition is met, install the metering facility on the pipeline meeting the condition and record the water intake quantity of the water intake head; S3: construct a physical model of the water intake pipeline through the gravity similarity criterion and the Froude number similarity condition, and the physical model ensures to meet the preset flow state similarity requirement; S4: set the minimum requirement of the water flow Reynolds number and the Weber number, and calculate the water flow Reynolds number and the Weber number; S5: in the physical model, considering the site condition, the convenience of component production and the water supply capacity factors, set a preset geometric scale, and calculate the flow velocity scale, the flow scale and the roughness scale based on the similarity criterion; use the tracer ball to carry out the physical model test of the water intake pipeline, test the relationship between the ball velocity and the actual flow velocity and the actual flow, and through the fitting of the test data, obtain the empirical formula of the ball velocity and the tunnel water flow; S6: placing tracer spheres at the head of the water intake pipeline to carry out field test of the water intake pipeline, observing the running time of the metering tracer spheres at the end of the water intake pipeline, and calculating the flow rate of the tracer spheres, fitting the flow rate-sphere transport speed relationship curve through multiple tests, calculating the flow rate at the water intake head of the water intake pipeline, and converting to obtain the daily water intake volume; S7: investigating the end water users of the water intake pipeline, counting the metering facilities of the water using units, and testing the daily water intake volume of the end water users; S8: calculating the leakage water volume and leakage rate of the water intake pipeline according to the test results of the water intake head and the end water users of the water intake pipeline; S9: calculating the calculation formula of the water intake volume at the water intake head of the self-flowing water intake pipeline through the end water intake volume and the leakage water volume of the water intake pipeline.

[0006] In the scheme, the S3 is specifically: The physical model of the water intake pipeline is constructed according to the purpose, content and requirements of the test research of the water intake head, the physical model is designed into a normal model according to the gravity similarity criterion, and the Froude number similarity condition is adopted; The preset flow state similarity requirements include: D1, the minimum water depth of the physical model meets the test requirements, and the maximum flow rate of the model must be less than the maximum water supply flow rate of the laboratory pump house; D2, the water flow of the physical model must be turbulent, and the Reynolds number of the water flow must be greater than the critical Reynolds number, that is ; D3, the water depth of the physical model is not less than 3cm, so as to ensure that the gravity effect on the water flow in the model is not significantly affected by the surface tension; D3, the size of the scale is considered to facilitate the model manufacturing, the safety of the test and the convenience of the work.

[0007] In the scheme, the S4 is specifically: Based on the preset test procedure, the minimum requirements of the Reynolds number and the Weber number at the inlet of the model under each test condition are set to be greater than 5 and 120 respectively, and the calculation formula is as follows: ; ; In the formula, V is the average flow rate of the inlet section, in m / s; h is the inlet height, in m; v is the kinematic viscosity coefficient of water, which is taken as , the temperature is 10 ; is the surface tension coefficient of the water / air interface, which is taken as ; is the liquid density, which is taken as .

[0008] In the scheme, the S5 is specifically: Under the condition of meeting the preset flow state similarity requirement of the physical model, considering the site condition, component manufacturing convenience and water supply capacity factors, a geometric scale of 1:60 is selected, and the scale of each parameter is calculated according to the similarity criterion as follows: Flow velocity scale: ; Flow scale: ; Roughness scale: ; The tracer ball is used to carry out the physical model test of the water intake pipeline to test the relationship between the ball flow velocity and the actual flow velocity and the actual flow. The driving force of the tracer ball transport is the water flow drag force, so the ball velocity is not greater than the water flow velocity . The greater the water flow velocity in the tunnel, the greater the resistance received by the ball due to water flow turbulence, and the greater the flow velocity difference between the ball and the water flow. The tunnel water intake flow has a linear relationship with the water flow velocity and a positive correlation with the ball velocity with a decreasing slope. The Q- relationship can be obtained through the model test. The test uses high-precision water level, flow velocity and flow measurement facilities, wherein the water level measurement accuracy is not less than 0.1mm, the flow velocity measurement accuracy is not less than 0.01m / s, and the flow measurement accuracy is not less than 0.1L / s. The test data should include the minimum and maximum water intake flow of the project and at least 4 different intermediate flows. Through the fitting of the test data, the empirical formula for calculating the tunnel water intake flow Q using the average transport speed U of the tracer ball is as follows: ; In the formula, a, b, c is the coefficient obtained by fitting the test data.

[0009] In the scheme, the S6 is specifically: The tracer ball is used to carry out the field test of the water intake pipeline. The tracer ball is placed at the head of the water intake pipeline, and the running time of the tracer ball is observed and measured at the end of the water intake pipeline. The field test time is not less than 7 days, and each day test not less than 4 groups of data. The flow velocity of the tracer ball is calculated through the length of the water intake pipeline and the running time of the tracer ball. The flow at the water intake head of the water intake pipeline is calculated through the flow- ball transport speed relationship curve obtained by the physical model test, and the daily water intake volume is converted to obtain the daily water intake volume. The calculation is as follows: ; In the formula, W is the daily water intake volume at the water intake head, unit: 104 i is the time of field test, is the water flow corresponding to the test time, k is the number of groups tested per day.

[0010] In the scheme, the S7 is specifically: The end water user of the water taking pipeline is investigated, the number of water using units, the water volume of which should be equipped with measuring instruments, the number of measuring devices which have been equipped, the measuring facilities which are not installed by the end water user are installed, the end water user is tested, the test time is consistent with the field test of the water taking pipeline, and the test time is not less than 7 days, and the daily water taking volume of the end water user is tested .

[0011] In the scheme, in the S8, the leakage rate of the water taking pipeline is calculated as follows: ; Wherein, is the leakage rate of the water taking pipeline, is the daily water taking volume of the end water user, and W is the daily water taking volume of the water taking head.

[0012] In the scheme, the water taking volume measurement formula of the water taking head in the S9 is as follows: ; Wherein, is the water taking volume of the water taking head, is the daily water taking volume of the end water user, is the leakage rate of the water taking pipeline.

[0013] The second aspect of the application also provides a self-flowing water taking pipeline water taking measurement system, which comprises a memory, a processor, and a data interface, the memory comprises a self-flowing water taking pipeline water taking measurement program and measurement water treatment data, the data interface is used for connecting a user terminal, a display terminal and a water treatment terminal, and the self-flowing water taking pipeline water taking measurement program is executed by the processor to realize the following steps: S1: combing the water taking head water taking pipeline situation, determining the water taking source, obtaining the water taking source water surface elevation, the water taking port top elevation, the water taking port bottom elevation, the water taking port submergence depth, the water taking pipeline length, the water taking pipeline inner diameter, the water taking pipeline slope, the outlet bottom elevation, the existing measurement facility installation position, the installation number, the calibration situation, and the water taking pipeline design drawing; S2: judging whether the water taking pipeline has the condition of installing the measurement facility, if the installation condition is met, the measurement facility is installed on the pipeline meeting the condition and the water taking volume of the water taking head is recorded; S3: constructing a water taking pipeline physical model through the gravity similarity criterion and the Froude number similarity condition, and the physical model ensures to meet the preset flow state similarity requirement; S4: set minimum requirements of water flow Reynolds number and Weber number, and calculate water flow Reynolds number and Weber number; S5: in the physical model, considering site conditions, component manufacturing convenience and water supply capacity factors, set a preset geometric scale, and calculate flow velocity scale, flow scale and roughness scale based on similarity criteria; a tracer ball is used to carry out a water intake pipeline physical model test, the relationship between ball flow velocity and actual flow velocity and actual flow is tested, and an empirical formula of ball velocity and tunnel water flow is obtained through fitting of test data; S6: a tracer ball is placed at the head of the water intake pipeline to carry out a water intake pipeline field test, the running time of the metering tracer ball is observed at the end of the water intake pipeline, and the flow velocity of the tracer ball is calculated, a flow-ball transport velocity relationship curve is fitted through multiple tests, the flow at the water intake head of the water intake pipeline is calculated, and daily water intake is obtained by conversion; S7: the end water users of the water intake pipeline are investigated, the metering facilities of the water using units are counted, and daily water intake of the end water users is tested; S8: according to the test results of the water intake head of the water intake pipeline and the end water users, the leakage water quantity and leakage rate of the water intake pipeline are calculated; S9: through the end water quantity and the leakage water quantity of the water intake pipeline, a calculation formula of the water intake quantity at the water intake head of the self-flowing water intake pipeline is obtained.

[0014] The third aspect of the application also provides a computer readable storage medium, the computer readable storage medium comprises a self-flowing water intake pipeline water metering program, and the self-flowing water intake pipeline water metering program is executed by a processor to realize the steps of the self-flowing water intake pipeline water metering method according to any one of the above.

[0015] Through the scheme of the application, based on real-time monitoring of the water intake quantity of the end water users, the water intake quantity of the self-flowing water intake pipeline can be reasonably calculated and determined, and the problem that the water intake metering at the water intake head of the self-flowing water intake pipeline cannot be realized due to insufficient metering conditions is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A simplified flowchart of a self-flowing water intake pipeline water metering method is shown; Figure 2 A schematic diagram of a water supply network and metering facilities is shown; Figure 3 A schematic diagram of a physical model simulation range is shown; Figure 4 A flow-ball transport velocity relationship curve is shown; Figure 5 A block diagram of a self-flowing water intake pipeline water metering system is shown. DETAILED DESCRIPTION

[0017] In order to enable a more complete understanding of the above-mentioned objects, features and advantages of the present application, the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0018] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and therefore the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0019] Figure 1 A simplified flowchart of a self-flowing water intake pipeline water intake metering method of the present application is shown.

[0020] As shown in Figure 1 The first aspect of the present application provides a self-flowing water intake pipeline water intake metering method, comprising: S1: combing the water intake pipeline situation at the water intake head, determining the water source, obtaining the water surface elevation of the water source, the top elevation of the water intake outlet, the bottom elevation of the water intake outlet, the submerged water depth of the water intake outlet, the length of the water intake pipeline, the inner diameter of the water intake pipeline, the slope of the water intake pipeline, the bottom elevation of the outlet, the installation position, the installation quantity, the calibration situation of the existing metering facilities of the pipeline, and the design drawing of the water intake pipeline; S2: judging whether the water intake pipeline has the condition of installing metering facilities, if the installation condition is met, installing metering facilities on the pipeline meeting the condition and recording the water intake at the water intake head; S3: constructing a physical model of the water intake pipeline through the gravity similarity criterion and the Froude number similarity condition, and the physical model ensures to meet the preset flow state similarity requirement; S4: setting the minimum requirement of the water flow Reynolds number and the Weber number, and calculating the water flow Reynolds number and the Weber number; S5: in the physical model, considering the site condition, the convenience of component manufacturing and the water supply capacity factors, setting a preset geometric scale, and calculating the flow velocity scale, the flow scale and the roughness scale based on the similarity criterion; using a tracer ball to carry out a water intake pipeline physical model test, testing the relationship between the ball velocity and the actual flow velocity and the actual flow, and through the fitting of the test data, obtaining an empirical formula of the ball velocity and the tunnel water flow; S6: placing a tracer ball at the head of the water intake pipeline to carry out a water intake pipeline field test, observing the running time of the metering tracer ball at the end of the water intake pipeline, and calculating the flow velocity of the tracer ball, fitting the flow-velocity relationship curve through multiple tests, calculating the flow at the water intake head of the water intake pipeline, and converting to obtain the daily water intake; S7: Investigate the end water user of the water intake pipeline, count the metering facilities of the water consumption unit, and test the daily water intake of the end water user; S8: According to the test results of the water intake head and the end water user of the water intake pipeline, the water leakage quantity and the leakage rate of the water intake pipeline are calculated; S9: The calculation formula of the water intake quantity of the water intake head of the self-flowing water intake pipeline is calculated through the end water intake quantity and the water leakage quantity of the water intake pipeline.

[0021] It can be understood that in S2, if the installation condition is not met, the method of the application can be used, and for the pipeline with installation condition, the water intake device installation and metering can obtain more metering information of the target water intake pipeline, and the overall test and simulation analysis metering process can be effectively improved. Here, the water intake pipeline or head is generally a self-flowing water intake pipeline or head, and for the application, in the case that it can be actually applied and the error meets the expectation, other types of water intake pipelines or water intake equipment can be applied to each other.

[0022] Figure 2 A schematic diagram of a water supply pipe network of an embodiment of the application is shown; In a preferred embodiment, as shown in the following statistical tables 1 and 2, the water intake pipeline of the water source project in the urban area of Heyuan City takes water from the Xinfengjiang Reservoir, the pipeline parameter of the water source project in the urban area of Heyuan City is shown in Table 1, the metering facility parameter is shown in Table 2, and the schematic diagram of the water supply pipe network is shown in Figure 2 .

[0023] Table 1: Statistical table of pipeline parameters of water source project in urban area of Heyuan City

[0024] Table 2: Parameters of existing metering facilities of water source project in urban area of Heyuan City

[0025] According to the embodiment of the application, S3 is specifically: The physical model of the water intake pipeline is constructed according to the purpose, content and requirements of the test research of the water intake head pipeline, the physical model is designed into a normal model according to the gravity similarity criterion, and the Froude number similarity condition is used for design; The preset flow state similarity requirements include: D1, the minimum water depth of the physical model meets the requirements of the test, and the maximum flow of the model must be less than the maximum water supply flow of the laboratory pump house; D2, the water flow of the physical model must be turbulent, and the Reynolds number of the water flow must be greater than the critical Reynolds number, that is, ; D3, the water depth of the physical model is not less than 3 cm, so as to ensure that the gravity effect on the water flow in the model is not significantly affected by the surface tension; D3, the size of the scale considers the convenience of model making, the safety of test and the convenience of work.

[0026] It should be noted that the critical Reynolds number is generally 2500-500. In condition D2, the water flow is suitable in the square region of turbulent resistance, so as to ignore the influence of viscous force.

[0027] Meanwhile, in the model test, due to the influence of the model scale, and the value of We is less than the prototype, the viscous force and the surface tension have relatively large influences on the circulation and vortex, so in the model design, the Reynolds number and the Weber number We exceed a certain critical value, so that the influences of viscous force and surface tension can be ignored, so as to avoid the influence of the scale on the surface vortex.

[0028] According to the embodiment of the present application, the S4 is specifically: Based on the preset test procedure, the minimum requirements of the Reynolds number and the Weber number at the model water inlet under each test condition are respectively greater than 5*10^4 and 120, and the calculation formula is as follows: ; ; In the formula, V is the average flow velocity of the water inlet section, in m / s; h is the inlet height, in m; v is the kinematic viscosity coefficient of water, which is taken as 1.0*10^-6 m^2 / s, T is the temperature, which is taken as 10 ; ; is the surface tension coefficient of the water / air interface, which is taken as 0.073 N / m; ; is the liquid density, which is taken as 1000 kg / m^3. .

[0029] It should be noted that the preset test procedure is specifically 'Hydraulic Model Test Procedure for Water Inlet Channel of Circulating Water System in Power Plant' (DLT 286-2012).

[0030] Figure 3 The physical model simulation range of the embodiment of the present application is shown in the schematic diagram. In a preferred embodiment, such as the water intake pipeline of the water source project in the urban area of Heyuan, according to the test needs, the upper boundary of the model is cut to 81 m upstream of the water inlet channel, the lower boundary is cut to the last section of the water gate, including the water inlet channel, the water intake project, the whole section of the water conveying tunnel and the water gate project, the side boundary of the upstream reservoir area is cut to the bank slope above 116.0 m on the left and right banks, and the model range is shown in the schematic diagram as Figure 3 .

[0031] ​It can be understood that the model mainly studies the water flow of the tunnel, the water depth in front of the dam is large, and the terrain of the reservoir section of the model is shaped according to the bottom elevation of the inlet channel of 86.20 m. The pool side wall of the model is built with red bricks by cement mortar, and the inside is smoothed by cement plaster. In addition, in order to facilitate the observation of the water delivery tunnel and to ensure that the roughness of the model is similar to that of the original body, the inlet and outlet gates are made of fir and polished with wax, and the water delivery tunnel is made of organic glass tube. The model is divided into water measuring weir, inlet forebay, reservoir transition section, inlet channel section, inlet section, water delivery tunnel section, outlet gate section and tailrace channel section from upstream to downstream. The length is about 70 m, the height is about 1.0 m, and the area is about 80 .

[0032] According to the embodiment of the present application, the S5 is specifically: Under the condition of meeting the preset flow pattern similarity requirements of the physical model, considering the site conditions, component manufacturing convenience and water supply capacity factors, the geometric scale is selected as 1:60, and the scale of each parameter is calculated according to the similarity criterion as follows: Flow velocity scale: ; Flow rate scale: ; Roughness scale: ; The tracer ball is used to carry out the physical model test of the water taking pipeline to test the relationship between the ball flow velocity and the actual flow velocity and the actual flow rate. The driving force of the tracer ball transport is the water flow drag force, so the ball velocity is not greater than the water flow velocity . The greater the water flow velocity in the tunnel, the greater the resistance received by the ball due to water flow turbulence, and the greater the flow velocity difference between the ball and the water flow. The tunnel water flow rate is linearly related to the water flow velocity and has a positive correlation with the ball velocity with a decreasing slope. The Q- relationship is obtained through the model test, and A is the cross-sectional area of the tunnel. The test uses high-precision water level, flow velocity and flow rate measuring facilities, wherein the water level measurement accuracy is not less than 0.1 mm, the flow velocity measurement accuracy is not less than 0.01 m / s, and the flow rate measurement accuracy is not less than 0.1 L / s. The test data needs to include the minimum and maximum water flow rates of the project and at least 4 different intermediate flow rates. Through the fitting of the test data, the empirical formula for calculating the tunnel water flow rate Q using the average transport speed U of the tracer ball is as follows: ; In the formula, a, b, c is a coefficient obtained by fitting the test data.

[0033] It can be understood that the water flow of the tunnel can be calculated after the tracing ball speed is tested on site through the above formula.

[0034] Here, according to the purpose, content and requirement of the test research, and the similarity theory of the model test, the physical model is designed as a normal model according to the gravity similarity criterion, that is, the Froude number similarity condition is used.

[0035] Figure 4 A flow-ball speed relationship curve of an embodiment of the present application is shown; In a preferred embodiment, in the physical model test of the water intake pipeline of the water source project in the urban area of Heyuan, a high-precision water level measuring needle is used for water level measurement, and the precision can reach 0.1 mm; an LS-8C type 8-point photoelectric current meter is used for flow velocity measurement, and the minimum flow velocity measured by the flow meter is about 0.01 m / s, and the minimum water depth measured is about 0.02 m; an electromagnetic flow meter is used for flow measurement, and the precision is 0.11 L / s, and the range is 13.89-138.89 L / s. The flow-ball speed relationship curve obtained by the test is shown in Figure 4 .

[0036] According to the embodiment of the present application, the S6 is specifically: The tracing ball is used to carry out the field test of the water intake pipeline, the tracing ball is placed at the head of the water intake pipeline, and the running time of the tracing ball is observed and measured at the end of the water intake pipeline. The field test time is not less than 7 days, and each day test not less than 4 groups of data; the flow velocity of the tracing ball is calculated through the length of the water intake pipeline and the running time of the tracing ball; the water flow at the water intake head of the water intake pipeline is calculated through the flow-ball speed relationship curve obtained by the physical model test, and the daily water intake is converted to obtain the daily water intake, and the calculation is as follows: . In the formula, W is the daily water intake at the water intake head, unit is 104 m3 / d, is the field test time, is the water flow corresponding to the test time, k is the number of groups of data tested each day.

[0037] Here, each of the not less than 4 groups of data tested each day can be 8 o'clock, 12 o'clock, 16 o'clock and 20 o'clock.

[0038] In a preferred embodiment, for the water intake pipeline of the water source project in the urban area of Heyuan, the water intake at the water intake head of the water intake pipeline is tested for 7 days, and the test results are shown in Table 3.

[0039] Table 3: Field test results of water intake at the water intake head of the water intake pipeline of the water source project in the urban area of Heyuan

[0040] According to the embodiment of the present application, the S7 is specifically: The end water user of the water intake pipeline is investigated, the number of water consumption units, the water volume of which should be equipped with measuring instruments, the number of which has been equipped with measuring instruments, the measuring facilities not installed by the end water user are installed, the end water user is tested, the test time is consistent with the field test of the water intake pipeline, and is not less than 7 days, and the daily water intake volume of the end water user is tested .

[0041] In a preferred embodiment, such as the end water user of the water intake pipeline of the water source project in the urban area of Heyuan, 8 end water users are investigated and counted, 8 measuring instruments should be equipped, 8 measuring instruments have been equipped, and the equipment rate is 100%. The daily water intake volume of each end enterprise is 27.75 million , as shown in Table 4.

[0042] Table 4 Test results of end water users of water intake pipeline of water source project in urban area of Heyuan

[0043] According to the embodiment of the present application, in the S8, the leakage rate of the water intake pipeline is calculated as follows: ; Wherein, is the leakage rate of the water intake pipeline, is the daily water intake volume of the end water user, and W is the daily water intake volume of the water intake head.

[0044] In an embodiment, the water intake pipeline of the water source project in the urban area of Heyuan, according to the field test results of the water intake head and the test results of the end water, the leakage rate is calculated to be 2.46%. In the process of leakage rate calculation, one day or more daily water intake volume can be introduced for leakage rate calculation, for example, 7 days of daily water intake volume is introduced for calculation, then W is replaced by the daily water intake volume for calculation.

[0045] According to the embodiment of the present application, the water intake volume measurement formula of the water intake head in the S9 is as follows: ; Wherein, is the water intake volume of the water intake head, is the daily water intake volume of the end water user, is the leakage rate of the water intake pipeline.

[0046] In the present application, by monitoring the water intake volume of the end water user in real time, the water intake volume of the self-flowing water intake pipeline can be reasonably calculated and determined, and the problem that the water intake measurement of the water intake head of the self-flowing water intake pipeline cannot be realized due to insufficient measurement conditions is effectively solved.

[0047] According to the embodiment of the present application, it also includes: Based on N test cycles, the end-of-pipe water user test results and the head-of-pipe water field test results are linearly combined respectively to obtain N end-of-pipe water fitting coefficients and N head-of-pipe water fitting coefficients; The Pearson correlation coefficient is introduced to calculate the correlation of the N end-of-pipe water fitting coefficients and the N head-of-pipe water fitting coefficients, and the correlation coefficient is obtained. According to the absolute value of the correlation coefficient, a preset interval range of the leakage rate is set. Whether the leakage rate is in the preset interval range is determined, and a metering early warning analysis is performed.

[0048] Here, it can be understood that the correlation degree of the end-of-pipe water user test results and the head-of-pipe water field test results is closely related to the leakage rate. In the present application, the correlation degree is determined by introducing the Pearson correlation coefficient. The water quantity fitting analysis is performed on the test results of multiple cycles, and the end-of-pipe and head-of-pipe water linear change fitting coefficients under multiple cycles are calculated. The reasonable range interval of the leakage rate is set through the correlation of multiple fitting coefficients. If the final leakage rate exceeds the interval, further early warning analysis of the water taking facility is performed to determine whether the test conditions meet the expected state.

[0049] In N test cycles, each test cycle corresponds to a complete test time, for example, 7 days, and the end-of-pipe / head-of-pipe test results in 7 days are fitted to obtain an end-of-pipe / head-of-pipe fitting coefficient.

[0050] If the absolute value of the correlation coefficient is 0.95, the leakage rate range should be within 5% (1-0.95), that is, the preset interval range is [0, 5%].

[0051] In the linear combination, the fitting equation is: Y=P1×T+P2; wherein P1, P2 are fitting coefficients, Y is the water taking test result value, and T is the time (days). The N fitting coefficients obtained here are generally used to study the P1 value.

[0052] Figure 5 A block diagram of a self-flowing water taking pipe water metering system is shown.

[0053] The second aspect of the present application also provides a self-flowing water taking pipe water metering system, which comprises a memory 11, a processor 12, and a data interface 13. The memory comprises a self-flowing water taking pipe water metering program and metering water treatment data. The data interface is used to connect a user terminal, a display terminal, and a water treatment terminal. When the self-flowing water taking pipe water metering program is executed by the processor, the following steps are implemented: S1: combing the water taking pipeline situation of the water taking head, determining the water taking source, obtaining the water surface elevation of the water taking source, the top elevation of the water taking outlet, the bottom elevation of the water taking outlet, the submerged water depth of the water taking outlet, the length of the water taking pipeline, the inner diameter of the water taking pipeline, the slope of the water taking pipeline, the bottom elevation of the water outlet, the installation position, the installation quantity and the calibration situation of the existing metering facilities of the pipeline, and the pipeline design drawing; S2: judging whether the water taking pipeline has the installation condition of the metering facilities, if the installation condition is met, installing the metering facilities on the pipeline meeting the condition and recording the water taking quantity of the water taking head; S3: constructing a physical model of the water taking pipeline through the gravity similarity criterion and the Froude number similarity condition, and the physical model guarantees to meet the preset flow state similarity requirement; S4: setting the minimum requirement of the water flow Reynolds number and the Weber number, and calculating the water flow Reynolds number and the Weber number; S5: in the physical model, considering the site condition, the component manufacturing convenience and the water supply capacity factors, setting a preset geometric scale, and calculating the flow velocity scale, the flow scale and the roughness scale based on the similarity criterion; the tracer ball is used to carry out the physical model test of the water taking pipeline, the relationship between the ball flow velocity and the actual flow velocity and the actual flow is tested, the empirical formula of the ball velocity and the tunnel water flow is obtained through the fitting of the test data; S6: the tracer ball is placed at the head of the water taking pipeline to carry out the field test of the water taking pipeline, the running time of the metering tracer ball is observed at the end of the water taking pipeline, the flow velocity of the tracer ball is calculated, the flow-velocity relationship curve is fitted through a plurality of test results, the flow at the head of the water taking pipeline is calculated, and the daily water taking quantity is obtained through conversion; S7: investigating the end water taking user of the water taking pipeline, counting the metering facilities of the water using unit, and testing the daily water taking quantity of the end water taking user; S8: according to the test results of the head of the water taking pipeline and the end water taking user, the leakage water quantity and the leakage rate of the water taking pipeline are calculated; S9: through the end water taking quantity and the leakage water quantity of the water taking pipeline, the calculation formula of the water taking quantity at the head of the water taking pipeline of the self-flowing water taking pipeline is calculated.

[0054] The metering water treatment data includes various water parameters, metering values and formula coefficients obtained through S1-S9. The self-flowing water taking pipeline water taking metering system realizes the steps of the self-flowing water taking pipeline water taking metering method in any one of the above.

[0055] The third aspect of the application further provides a computer readable storage medium, the computer readable storage medium includes a self-flowing water taking pipeline water taking metering program, when the self-flowing water taking pipeline water taking metering program is executed by a processor, the steps of the self-flowing water taking pipeline water taking metering method in any one of the above are realized.

[0056] The application discloses a self-flowing water intake pipeline water intake metering method and system, and relates to the technical field of water intake pipeline water intake metering.

[0057] In the above embodiments, all or part of the embodiments can be realized by software, hardware, firmware or any combination thereof. When realized by software, all or part of the embodiments can be realized in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the application can be generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through a wired (for example: coaxial cable, optical fiber, data user line) or wireless (for example: infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available medium can be a magnetic medium (for example: floppy disk, hard disk, magnetic tape), an optical medium (for example: digital versatile disc, or a semiconductor medium (for example: solid state disk) etc. In various embodiments of the application, if there is no special description and logical conflict, the terms and / or descriptions of different embodiments are consistent and can be referred to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0058] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or two more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone, wherein A and B can be singular or plural. In the textual description of the embodiments of the present application, the character " / " generally represents that the front and rear associated objects are in an "or" relationship. In the present application, "first", "second", and various number designations are only for the convenience of description and do not limit the scope of the embodiments of the present application. For example, to distinguish different messages, etc., and are not used to describe a specific order or sequence.

[0059] It can be understood that the various number designations involved in the embodiments of the present application are only for the convenience of description and do not limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined by its function and inherent logic.

[0060] Finally, it should be noted that the above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A self-flowing water intake pipe water intake metering method, characterized by, The method comprises the following steps: S1: combing the water intake pipeline of the water intake head, determining the water source, obtaining the water surface elevation of the water source, the top elevation of the water intake outlet, the bottom elevation of the water intake outlet, the submerged water depth of the water intake outlet, the length of the water intake pipeline, the inner diameter of the water intake pipeline, the slope of the water intake pipeline, the bottom elevation of the water outlet, the installation position, the installation quantity, the calibration condition of the existing metering facilities of the pipeline, and the design drawing of the water intake pipeline; S2: judging whether the water intake pipeline has the condition of installing metering facilities, if the installation condition is met, installing metering facilities on the pipeline meeting the condition and recording the water intake quantity of the water intake head; S3: constructing a physical model of the water intake pipeline through the gravity similarity criterion and the Froude number similarity condition, and the physical model ensures to meet the preset flow state similarity requirement; S4: setting the minimum requirement of the water flow Reynolds number and the Weber number, and calculating the water flow Reynolds number and the Weber number; S5: in the physical model, considering the site condition, the component manufacturing convenience and the water supply capacity factors, setting a preset geometric scale, and calculating the flow velocity scale, the flow scale and the roughness scale based on the similarity criterion; the physical model test of the water intake pipeline is carried out by using the tracer ball, the relationship between the ball flow velocity and the actual flow velocity and the actual flow is tested, the empirical formula of the ball velocity and the tunnel water flow is obtained through the fitting of the test data; S6: placing the tracer ball at the head of the water intake pipeline to carry out the field test of the water intake pipeline, observing the running time of the metering tracer ball at the end of the water intake pipeline, calculating the flow velocity of the tracer ball, fitting the flow-velocity relationship curve of the tracer ball through multiple tests, calculating the flow at the head of the water intake pipeline, and converting the daily water intake quantity; S7: investigating the end water users of the water intake pipeline, counting the metering facilities of the water users, and testing the daily water intake quantity of the end water users; S8: calculating the leakage water quantity and the leakage rate of the water intake pipeline according to the test results of the head of the water intake pipeline and the end water users; S9: calculating the calculation formula of the water intake quantity at the head of the self-flowing water intake pipeline through the end water intake quantity and the leakage water quantity of the water intake pipeline.

2. A self-flowing water intake pipe water intake metering method according to claim 1, characterized in that, The S3 specifically comprises: constructing a physical model of the water intake pipeline according to the purpose, content and requirement of the test research of the water intake head, designing the physical model into a normal model according to the gravity similarity criterion, and designing based on the Froude number similarity condition; the preset flow state similarity requirement comprises: D1, the minimum water depth of the physical model meets the test requirement, and the maximum flow of the model must be less than the maximum water supply flow of the pump room of the test room; D2. The water flow of the physical model must be turbulent, the water flow Reynolds number must be greater than the critical Reynolds number, i.e. Re h ≥ 5000; D3, the water depth of the physical model is not less than 3 cm, so as to ensure that the gravity effect of the water flow in the model is not significantly affected by the surface tension; D3, the size of the scale is considered to be convenient for model manufacturing, safe for test, and convenient for work.

3. A self-flowing water intake pipe water intake metering method according to claim 2, characterized in that, The S4 specifically comprises: Based on the pre-set test procedure, the minimum requirements of Reynolds number and Weber number at the water inlet of the model under each test condition are set to be greater than 5×10 4 and 120, respectively, and the calculation formula is as follows: Re h = Vh / v; We = pV 2 h / σ; In the formula, V is the average flow velocity of the water inlet section, in m / s; h is the inlet height, in m; v is the kinematic viscosity of water, taken as v = 1.31 x 10 -6 m 2 / s, temperature 10°C; σ is the surface tension coefficient of the water / air interface, taken as σ = 0.074 N / m; and ρ is the liquid density, taken as ρ = 1000 kg / m 3 .

4. A self-flowing water intake pipe water intake metering method according to claim 1, characterized in that, The S5 specifically comprises: under the condition of meeting the preset flow state similarity requirement of the physical model, considering the site condition, the component manufacturing convenience and the water supply capacity factors, selecting the geometric scale = 1:60, and calculating the scale of each parameter according to the similarity criterion as follows: Flow rate scale: Flow scale: Roughness scale: The tracer ball is used in the physical model test of water intake pipeline to test the relationship between the ball velocity and the actual flow velocity and the actual flow rate. The driving force of the tracer ball is the water flow drag force, so the ball velocity U 球 is less than the water flow velocity U 水 . The greater the water flow velocity in the tunnel, the greater the resistance received by the ball due to water flow turbulence, and the greater the velocity difference between the ball and the water flow. The tunnel water flow rate Q = U 水 A 洞 is linearly related to the water flow velocity U 水 , and is positively related to the ball velocity U 球 with a decreasing slope. The Q-U 球 relationship can be obtained through the model test, and A 洞 is the cross-sectional area of the tunnel. The test adopts high-precision water level, flow velocity and flow rate measuring facilities, wherein the water level measuring precision is not less than 0.1mm, the flow velocity measuring precision is not less than 0.01m / s, and the flow rate measuring precision is not less than 0.1L / s; the test data needs to include the minimum and maximum water delivery flow rates of the project and at least 4 groups of different intermediate flow rates; through fitting of the test data, the empirical formula for calculating the tunnel water delivery flow rate Q by using the average migration speed U of the tracer ball is as follows: Q = aU 球 2 + bU 球 + c; In the formula, a, b and c are coefficients obtained by fitting of the test data.

5. A self-flowing water intake pipe water intake metering method according to claim 1, characterized in that, The S6 is specifically: The tracer ball is used to carry out the field test of the water taking pipeline, the tracer ball is placed at the head of the water taking pipeline, the running time of the tracer ball is observed and measured at the end of the water taking pipeline, the field test time is not less than 7 days, and not less than 4 groups of data are tested per day; the flow velocity of the tracer ball is calculated through the length of the water taking pipeline and the running time of the tracer ball; the flow rate of the water taking head of the water taking pipeline is calculated through the flow rate-ball migration speed relationship curve obtained by the physical model test, and the daily water taking volume is converted to obtain the daily water taking volume, and the calculation is as follows: In the formula, W is the daily water intake of the water intake head, unit: 10,000 m 3 , i is the time of field test, Q i is the water flow corresponding to the test time, k is the number of groups tested per day.

6. A self-flowing water intake pipe water intake metering method according to claim 1, characterized in that, The S7 is specifically: Investigate the end user of the water intake pipeline, count the number of water-using units, the water volume that should be equipped with measuring instruments, the number of measuring devices that have been equipped, install the measuring facilities that have not been installed for the end user, test the end user, the test time should be consistent with the field test of the water intake pipeline, not less than 7 days, and test the daily water intake volume Q of the end user a .

7. A self-flowing water intake pipe water intake metering method according to claim 1, characterized in that, In the S8, the leakage rate of the water taking pipeline is calculated as follows: wherein R a is the leakage rate of the water intake pipeline, Q a is the daily water intake volume of the terminal water intake user, and W is the daily water intake volume of the water intake head.

8. A self-flowing water intake pipe water intake metering method according to claim 1, characterized in that, In the S9, the water taking volume measurement formula of the water taking head is as follows: Q S = Q a (1 - R a ); where Q S is the water intake volume, Q a is the daily water intake volume of the end water intake user, R a is the leakage rate of the water intake pipeline.

9. A gravity flow water intake metering system, characterized by, The system comprises a memory, a processor, and a data interface; the memory comprises a self-flowing water taking pipeline water taking measurement program and measurement water treatment data; the data interface is used to connect a user terminal, a display terminal and a water treatment terminal; and the self-flowing water taking pipeline water taking measurement program, when executed by the processor, implements the following steps: S1: collate the water taking pipeline situation of the water taking head, determine the water taking source, obtain the water taking source water surface elevation, the water taking outlet top elevation, the water taking outlet bottom elevation, the water taking outlet submerged water depth, the water taking pipeline length, the water taking pipeline inner diameter, the water taking pipeline slope, the outlet bottom elevation, the installation position, the installation quantity and the calibration situation of the existing measurement facilities of the pipeline, and the water taking pipeline design drawing; S2: determine whether the water taking pipeline meets the installation condition of the measurement facilities, if the installation condition is met, install the measurement facilities on the pipeline meeting the condition and record the water taking volume of the water taking head; S3: construct a water taking pipeline physical model through the gravity similarity criterion and the Froude number similarity condition, and the physical model ensures to meet the preset flow state similarity requirement; S4: set the minimum requirement of the water flow Reynolds number and the Weber number, and calculate the water flow Reynolds number and the Weber number; S5: in the physical model, consider the site condition, the component manufacturing convenience and the water supply capacity factors, set a preset geometric scale, and calculate the flow velocity scale, the flow rate scale and the roughness scale based on the similarity criterion; use a tracer ball to carry out a water taking pipeline physical model test, test the relationship among the ball flow velocity, the actual flow velocity and the actual flow rate, and obtain an empirical formula of the ball speed and the tunnel water delivery flow rate through fitting of the test data; S6: place a tracer ball at the head of the water taking pipeline to carry out a water taking pipeline field test, observe and measure the running time of the tracer ball at the end of the water taking pipeline, and calculate the flow velocity of the tracer ball; through fitting of multiple groups of test data, a flow rate-ball migration speed relationship curve is obtained, the water taking head flow rate of the water taking pipeline is calculated, and the daily water taking volume is converted to obtain the daily water taking volume; S7: Investigate the end water user of the water intake pipeline, count the metering facilities of the water-using unit, and test the daily water intake of the end water user; S8: According to the test results of the water intake head and the end water user of the water intake pipeline, the water leakage quantity and the leakage rate of the water intake pipeline are calculated; S9: Through the end water quantity and the water leakage quantity of the water intake pipeline, the calculation formula of the water intake quantity of the water intake head of the self-flowing water intake pipeline is calculated.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a self-flowing water intake pipeline water intake metering program, and when the self-flowing water intake pipeline water intake metering program is executed by the processor, the steps of the self-flowing water intake pipeline water intake metering method in any one of claims 1 to 8 are realized.

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