Calculation Method for Siltation Thickness of Sewage Pipeline and On-line Monitoring Device

Abstract

The present application discloses a method for calculating the siltation thickness of a sewage pipeline and an on-line monitoring device. The method may include: obtaining the dimension data of the sewage pipeline; calculating the hydraulic radius and constructing a flow velocity-water level relationship equation under the siltation state, which is the pipeline siltation model; measuring the water level height and the average flow velocity of the sewage pipeline in real time; and performing fitting through the water level height, the average flow velocity and the pipeline siltation model to calculate the siltation thickness. By establishing a flow velocity-water level relationship model for the pipeline siltation state, the present invention monitors parameters such as the water level height and the flow velocity in the pipeline in real time, draws a scatter plot of the flow velocity-water level and fits it with the curve of the flow velocity-water level relationship model, and realizes the discrimination of the siltation condition of the sewage pipeline and the calculation of the siltation thickness according to the fitting result.

Description

Technical Field

[0001] The present invention relates to the field of municipal drainage, and more specifically, to a method for calculating the siltation thickness of sewage pipes and an on-line monitoring device. Background Art

[0002] The sewage pipe network system is an important part of the urban drainage system and one of the important infrastructure of the city, undertaking the main tasks of sewage collection and transportation. The solid particles carried in the sewage gradually settle and accumulate with the change of the hydraulic state in the pipe, and siltation will gradually form at the bottom of the pipe. As the siltation thickness increases, the water passing capacity of the pipe will decrease or even block the pipe, affecting the safe and stable operation of the drainage system. To prevent and solve the pipe blockage and siltation and ensure the smooth operation of the drainage pipe network, it is necessary to regularly investigate the siltation situation in the drainage pipes, more accurately and comprehensively master the pipe siltation situation, and thus carry out dredging operations on the silted pipes targeted.

[0003] Currently, the form of regular on-site manual investigation is generally adopted, and tools such as mud insertion rods or mud measuring hoppers are used to measure the siltation thickness, so as to master the siltation state in the drainage pipe network. However, this manual measurement method has problems such as large errors, high safety risks and high labor costs.

[0004] Therefore, it is necessary to develop a method for calculating the siltation thickness of sewage pipes and an on-line monitoring device.

[0005] The information disclosed in the background art part of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] The present invention provides a method for calculating the siltation thickness of sewage pipes and an on-line monitoring device, which can establish a flow velocity - liquid level relationship model of the pipe siltation state, and by real-time monitoring of parameters such as the liquid level height and flow velocity in the pipe, draw a scatter plot of flow velocity - liquid level and fit the curve of the flow velocity - liquid level relationship model, and realize the discrimination of the siltation situation of the sewage pipe and the calculation of the siltation thickness according to the fitting result.

[0007] In a first aspect, an embodiment of the present disclosure provides a method for calculating the siltation thickness of sewage pipes, including:

[0008] Obtaining the size data of the sewage pipe;

[0009] Calculating the hydraulic radius and constructing a flow velocity - liquid level relationship equation in the siltation state, that is, a pipe siltation model;

[0010] Real-time measuring the liquid level height and average flow velocity of the sewage pipe;

[0011] Fitting is performed through the liquid level height, the average flow velocity, and the pipeline siltation model to calculate the siltation thickness.

[0012] Preferably, the dimensional data includes the pipeline radius, the hydraulic gradient, and the pipeline roughness coefficient.

[0013] Preferably, when the pipeline fullness ≤ 50%, calculating the hydraulic radius includes:

[0014] Calculating the wetted perimeter in the siltation state is:

[0015]

[0016] Calculating the cross-sectional area of flow in the siltation state is:

[0017]

[0018] According to the wetted perimeter and the cross-sectional area of flow, calculate the hydraulic radius;

[0019] Wherein, r is the pipeline radius, h is the liquid level height, and t is the siltation thickness.

[0020] Preferably, the hydraulic radius is calculated by formula (1):

[0021]

[0022] Preferably, when the pipeline fullness ≤ 50%, the pipeline siltation model is:

[0023]

[0024] Wherein, ν is the flow velocity, n is the pipeline roughness coefficient, and I is the hydraulic gradient.

[0025] Preferably, when the pipeline fullness > 50%, calculating the hydraulic radius includes:

[0026] Calculating the wetted perimeter in the siltation state is:

[0027]

[0028] Calculating the cross-sectional area of flow in the siltation state is:

[0029]

[0030] According to the wetted perimeter and the cross-sectional area of flow, calculate the hydraulic radius;

[0031] Wherein, r is the pipeline radius, h is the liquid level height, and t is the siltation thickness.

[0032] Preferably, the hydraulic radius is calculated by formula (3):

[0033]

[0034] Preferably, when the pipe fullness > 50%, the pipe siltation model is:

[0035]

[0036] Wherein, ν is the flow velocity, n is the pipe roughness coefficient, and I is the hydraulic gradient.

[0037] Preferably, by fitting the pipe liquid level, the cross-section average flow velocity and the pipe siltation model, calculating the siltation thickness includes:

[0038] Drawing a flow velocity-liquid level scatter diagram through the pipe liquid level and the cross-section average flow velocity;

[0039] Drawing a flow velocity-liquid level curve according to the pipe siltation model;

[0040] Adjusting the value of the siltation thickness in the pipe siltation model to make the flow velocity-liquid level curve coincide with the flow velocity-liquid level scatter diagram, and the corresponding siltation thickness is the siltation thickness in the pipe.

[0041] In a second aspect, the embodiments of the present disclosure also provide an on-line monitoring device for the siltation thickness of a sewage pipe, including:

[0042] A liquid level monitoring module for real-time obtaining the liquid level height of the sewage in the pipe;

[0043] A flow velocity monitoring module for real-time obtaining the average flow velocity of the sewage in the pipe;

[0044] A monitoring data transmission module for transmitting the real-time data of the liquid level height and the average flow velocity to a siltation discrimination calculation module;

[0045] A monitoring device power supply module for supplying power to the liquid level monitoring module, the flow velocity monitoring module and the monitoring data transmission module;

[0046] A siltation discrimination calculation module for performing the following steps:

[0047] Obtaining the dimension data of the sewage pipe;

[0048] Obtaining the liquid level height and the average flow velocity of the sewage pipe;

[0049] Calculating the hydraulic radius, constructing a flow velocity-liquid level relationship equation in the siltation state, which is the pipe siltation model;

[0050] Calculating the siltation thickness by fitting the liquid level height, the average flow velocity and the pipe siltation model.

[0051] Preferably, the dimensional data includes the pipe radius, hydraulic gradient, and pipe roughness coefficient.

[0052] Preferably, when the pipe fullness degree ≤ 50%, calculating the hydraulic radius includes:

[0053] Calculating the wetted perimeter in the siltation state as:

[0054]

[0055] Calculating the cross-sectional area of flow in the siltation state as:

[0056]

[0057] Calculating the hydraulic radius according to the wetted perimeter and the cross-sectional area of flow;

[0058] wherein, r is the pipe radius, h is the liquid level height, and t is the siltation thickness.

[0059] Preferably, calculating the hydraulic radius through formula (1):

[0060]

[0061] Preferably, when the pipe fullness degree ≤ 50%, the pipe siltation model is:

[0062]

[0063] wherein, ν is the flow velocity, n is the pipe roughness coefficient, and I is the hydraulic gradient.

[0064] Preferably, when the pipe fullness degree > 50%, calculating the hydraulic radius includes:

[0065] Calculating the wetted perimeter in the siltation state as:

[0066]

[0067] Calculating the cross-sectional area of flow in the siltation state as:

[0068]

[0069] Calculating the hydraulic radius according to the wetted perimeter and the cross-sectional area of flow;

[0070] wherein, r is the pipe radius, h is the liquid level height, and t is the siltation thickness.

[0071] Preferably, calculating the hydraulic radius through formula (3):

[0072]

[0073] Preferably, when the pipe fullness > 50%, the pipe siltation model is:

[0074]

[0075] where ν is the flow velocity, n is the pipe roughness coefficient, and I is the hydraulic gradient.

[0076] Preferably, by fitting the pipe liquid level, the cross-sectional average flow velocity, and the pipe siltation model, calculating the siltation thickness includes:

[0077] Drawing a flow velocity - liquid level scatter plot through the pipe liquid level and the cross-sectional average flow velocity;

[0078] Drawing a flow velocity - liquid level curve according to the pipe siltation model;

[0079] Adjusting the value of the siltation thickness in the pipe siltation model to make the flow velocity - liquid level curve coincide with the flow velocity - liquid level scatter plot, and the corresponding siltation thickness is the siltation thickness in the pipe.

[0080] Its beneficial effects are as follows: For the conveying link of sewage in the drainage pipe, a pipe siltation condition discrimination and calculation model is established. By monitoring hydraulic parameters such as flow velocity and liquid level, it is judged whether there is a siltation condition in the sewage pipe, and the pipe siltation thickness is calculated, realizing the online monitoring of the sewage pipe, which can be used for the online monitoring and evaluation of the siltation state of the urban sewage pipe network.

[0081] The methods and devices of the present invention have other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent detailed implementation manners, or will be detailedly described in the accompanying drawings incorporated herein and the subsequent detailed implementation manners. These accompanying drawings and detailed implementation manners together are used to explain the specific principles of the present invention. Description of the Drawings

[0082] By describing the exemplary embodiments of the present invention in more detail in conjunction with the accompanying drawings, the above and other objects, features, and advantages of the present invention will become more obvious. Among them, in the exemplary embodiments of the present invention, the same reference numerals generally represent the same components.

[0083] Figure 1 Shows a flowchart of the steps of a method for calculating the siltation thickness of a sewage pipe according to an embodiment of the present invention.

[0084] Figure 2a and Figure 2b Respectively show the hydraulic calculation schematic diagrams of circular pipes with a pipe fullness ≤ 50% and > 50% according to an embodiment of the present invention.

[0085] Figure 3Shows a schematic diagram of the pipeline siltation discrimination curve according to an embodiment of the present invention. Detailed implementation manners

[0086] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0087] To facilitate understanding of the solutions and effects of the embodiments of the present invention, the following gives two specific application examples. Those skilled in the art should understand that this example is only for facilitating the understanding of the present invention, and any specific details are not intended to limit the present invention in any way.

[0088] Example 1

[0089] Figure 1 Shows a flowchart of the steps of a method for calculating the siltation thickness of a sewage pipeline according to an embodiment of the present invention.

[0090] As Figure 1 shown, the method for calculating the siltation thickness of the sewage pipeline includes: Step 101, obtaining the dimension data of the sewage pipeline; Step 102, calculating the hydraulic radius and constructing a flow velocity - liquid level relationship equation in the siltation state, which is the pipeline siltation model; Step 103, measuring the liquid level height and average flow velocity of the sewage pipeline in real time; Step 104, fitting through the liquid level height, average flow velocity and the pipeline siltation model to calculate the siltation thickness.

[0091] In one example, the dimension data includes the pipeline radius, hydraulic gradient and pipeline roughness coefficient. In one example, when the pipeline fullness ≤ 50%, calculating the hydraulic radius includes: calculating the wetted perimeter in the siltation state as:

[0092]

[0093] Calculating the cross - sectional area of the flowing water in the siltation state as:

[0094]

[0095] Calculating the hydraulic radius according to the wetted perimeter and the cross - sectional area of the flowing water;

[0096] wherein, r is the pipeline radius, h is the liquid level height, and t is the siltation thickness.

[0097] In one example, the hydraulic radius is calculated by formula (1):

[0098]

[0099] In one example, when the pipeline fullness ≤ 50%, the pipeline siltation model is:

[0100]

[0101] Among them, ν is the flow velocity, n is the pipe roughness coefficient, and I is the hydraulic gradient.

[0102] In one example, when the pipe fullness > 50%, calculating the hydraulic radius includes: calculating the wetted perimeter in the silted state as:

[0103]

[0104] Calculating the cross-sectional area of flow in the silted state as:

[0105]

[0106] Calculating the hydraulic radius according to the wetted perimeter and the cross-sectional area of flow;

[0107] Among them, r is the pipe radius, h is the liquid level height, and t is the siltation thickness.

[0108] In one example, calculating the hydraulic radius by formula (3):

[0109]

[0110] In one example, when the pipe fullness > 50%, the pipe siltation model is:

[0111]

[0112] Among them, ν is the flow velocity, n is the pipe roughness coefficient, and I is the hydraulic gradient.

[0113] In one example, fitting through the pipe liquid level, the average cross-sectional velocity, and the pipe siltation model, calculating the siltation thickness includes:

[0114] Drawing a scatter plot of velocity - liquid level through the pipe liquid level and the average cross-sectional velocity;

[0115] Drawing a curve of velocity - liquid level according to the pipe siltation model;

[0116] Adjusting the value of the siltation thickness in the pipe siltation model to make the velocity - liquid level curve coincide with the velocity - liquid level scatter plot, and the corresponding siltation thickness is the siltation thickness in the pipe.

[0117] Specifically, obtaining the size data of the sewage pipe, including the pipe radius, the hydraulic gradient, and the pipe roughness coefficient, etc., measuring the liquid level height of the sewage pipe in real time, that is, the vertical distance from the sewage liquid surface in the pipe to the inner wall of the pipe bottom, and the average velocity, that is, the average value of the sewage velocity in the pipe cross-section, calculating the hydraulic radius, and further constructing the velocity - liquid level relationship equation in the silted state, which is the pipe siltation model.

[0118] According to the Manning formula, the formula for calculating the average flow velocity of uniform flow inside a circular pipe is:

[0119]

[0120] Since for a fixed pipe, the roughness coefficient n and the slope I are generally fixed values, the variable is generally only the hydraulic radius R. The calculation method of the hydraulic radius R is:

[0121]

[0122] Among them, A is the cross-sectional area of the flowing water, and X is the wetted perimeter, that is, the boundary length wetted by the water flow on the cross-section of the flowing water.

[0123] Figure 2a and Figure 2b respectively show the schematic diagrams of the hydraulic calculation of circular pipes with a pipe fullness ≤ 50% and > 50% according to an embodiment of the present invention.

[0124] As Figure 2a shown, when the pipe fullness ≤ 50%, the wetted perimeter in the siltation state is calculated as:

[0125] X = 2θr - 2βr + 2rsinβ

[0126] Since Therefore,

[0127] Then there is

[0128] The cross-sectional area of the flowing water in the siltation state is calculated as the circular arc area = the sector area - the triangle area, that is:

[0129] A = (θ - cosθ·sinθ)·r 2 -(β - cosβ·sinβ)·r 2

[0130] Since Then there is

[0131] Then there is

[0132] According to the wetted perimeter and the cross-sectional area of the flowing water, the hydraulic radius is calculated through formula (1). Then when the pipe fullness ≤ 50%, the pipe siltation model is formula (2).

[0133] As Figure 2b shown, when the pipe fullness > 50%, the wetted perimeter in the siltation state is calculated as:

[0134] X = 2πr - 2θr - 2βr + 2rsinβ

[0135] Since Therefore

[0136] Then there is

[0137] Calculate the cross - sectional area of the water passage under the silted state. The area of the circular arc = the area of the sector - the area of the triangle, that is:

[0138] A = πr 2 -(θ - cosθ·sinθ)·r 2 -(β - cosβ·sinγβ)·r 2

[0139] Since

[0140] Then there is

[0141] According to the wetted perimeter and the cross - sectional area of the water passage, calculate the hydraulic radius through formula (3). When the pipe fullness > 50%, the pipe siltation model is formula (4).

[0142] Through the pipe liquid level and the average cross - sectional velocity, draw a scatter plot of velocity - liquid level; when the siltation thickness t = 0, substitute parameters such as the pipe radius r, roughness coefficient n, and slope I of the monitoring point into the pipe siltation model, and draw a velocity - liquid level relationship curve 302 in the non - silted state; compare the scatter plot of velocity - liquid level with the velocity - liquid level relationship curve 302 in the non - silted state. If the fitting degree is good, it can be judged that there is no siltation in the monitored pipe section, otherwise, there is siltation; when it is judged that there is siltation, by adjusting the siltation thickness parameter t, obtain the velocity - liquid level relationship curve 303 when the siltation thickness is t. When this curve fits the lower edge of the scatter plot of velocity - liquid level, the siltation thickness value t of this pipe section can be obtained.

[0143] Example 2

[0144] An on - line monitoring device for the siltation thickness of a sewage pipe of the present invention includes:

[0145] A liquid level monitoring module that obtains the liquid level height of the sewage in the pipe in real time;

[0146] A flow velocity monitoring module that obtains the average flow velocity of the sewage in the pipe in real time;

[0147] A monitoring data transmission module that transmits the real - time data of the liquid level height and the average flow velocity to the siltation discrimination calculation module;

[0148] The monitoring device power supply module provides power for the liquid level monitoring module, the flow rate monitoring module, and the monitoring data transmission module;

[0149] The siltation discrimination calculation module is used to perform the following steps:

[0150] Obtain the dimension data of the sewage pipe;

[0151] Obtain the liquid level height and average flow rate of the sewage pipe;

[0152] Calculate the hydraulic radius, construct the flow velocity - liquid level relationship equation under the siltation state, which is the pipe siltation model;

[0153] Fit through the liquid level height, average flow rate and the pipe siltation model to calculate the siltation thickness.

[0154] In one example, the dimension data includes the pipe radius, hydraulic gradient and pipe roughness coefficient.

[0155] In one example, when the pipe fullness ≤ 50%, calculating the hydraulic radius includes:

[0156] Calculate the wetted perimeter under the siltation state as:

[0157]

[0158] Calculate the cross - sectional area of flow under the siltation state as:

[0159]

[0160] Calculate the hydraulic radius according to the wetted perimeter and the cross - sectional area of flow;

[0161] Where, r is the pipe radius, h is the liquid level height, and t is the siltation thickness.

[0162] In one example, calculate the hydraulic radius through formula (1):

[0163]

[0164] In one example, when the pipe fullness ≤ 50%, the pipe siltation model is:

[0165]

[0166] Where, ν is the flow velocity, n is the pipe roughness coefficient, and I is the hydraulic gradient.

[0167] In one example, when the pipe fullness > 50%, calculating the hydraulic radius includes: Calculate the wetted perimeter under the siltation state as:

[0168]

[0169] The cross-sectional area of the water passage under the siltation state is calculated as follows:

[0170]

[0171] Calculate the hydraulic radius based on the wetted perimeter and the cross-sectional area of the water passage;

[0172] Among them, r is the pipe radius, h is the liquid level height, and t is the siltation thickness.

[0173] In one example, the hydraulic radius is calculated by formula (3):

[0174]

[0175] In one example, when the pipe fullness > 50%, the pipe siltation model is:

[0176]

[0177] Among them, ν is the flow velocity, n is the pipe roughness coefficient, and I is the hydraulic gradient.

[0178] In one example, by fitting the pipe liquid level, the cross-sectional average flow velocity, and the pipe siltation model, the calculation of the siltation thickness includes:

[0179] Draw a scatter plot of flow velocity - liquid level through the pipe liquid level and the cross-sectional average flow velocity;

[0180] Draw a curve of flow velocity - liquid level according to the pipe siltation model;

[0181] Adjust the value of the siltation thickness in the pipe siltation model to make the flow velocity - liquid level curve coincide with the flow velocity - liquid level scatter plot, and the corresponding siltation thickness is the siltation thickness in the pipe.

[0182] Specifically, the on-line monitoring device for the siltation thickness of the sewage pipe includes a flow meter installed at the outlet of the upstream pipe of the inspection well to measure the real-time average flow velocity of the sewage in the pipe; a liquid level meter installed in the inspection well to measure the liquid level height value of the sewage in the pipe; a fixed bracket to fix the probes of monitoring devices such as the flow meter and the liquid level meter, so that the probes maintain a fixed angle for continuous and stable monitoring of flow velocity and liquid level data; a battery pack to provide power for modules such as the liquid level meter, the flow meter, and the data storage and transmission device; a data storage and transmission device to receive and store the data information monitored and collected by the flow meter and the liquid level meter, and regularly upload the stored data information to the background data storage device such as a remote server.

[0183] It further includes a siltation discrimination calculation module for performing the following steps: obtaining the size data of the sewage pipeline; obtaining the liquid level height and average flow velocity of the sewage pipeline; calculating the hydraulic radius, constructing a flow velocity-liquid level relationship equation under the siltation state, which is the pipeline siltation model; and performing fitting through the liquid level height, average flow velocity and the pipeline siltation model to calculate the siltation thickness.

[0184] Those skilled in the art should understand that the purpose of the above description of the embodiments of the present invention is only to exemplarily illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any of the examples given.

[0185] The various embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for calculating the siltation thickness of a sewage pipeline, characterized in that, Including: Obtain the size data of the sewage pipeline; Calculate the hydraulic radius, and construct the flow velocity - liquid level relationship equation under the siltation state, which is the pipeline siltation model; Measure the liquid level height and average flow velocity of the sewage pipeline in real time; Fit through the liquid level height, the average flow velocity and the pipeline siltation model to calculate the siltation thickness; Wherein, when the pipeline fullness ≤ 50%, the pipeline siltation model is: Wherein, when the pipeline fullness > 50%, the pipeline siltation model is: Wherein, r is the pipeline radius, h is the liquid level height, t is the siltation thickness, ν is the flow velocity, n is the pipeline roughness coefficient, and I is the hydraulic gradient; Wherein, fitting through the pipeline liquid level, the average flow velocity and the pipeline siltation model to calculate the siltation thickness includes: Draw a flow velocity - liquid level scatter plot through the pipeline liquid level and the average flow velocity; Draw a flow velocity - liquid level curve according to the pipeline siltation model; Adjust the value of the siltation thickness in the pipeline siltation model to make the flow velocity - liquid level curve coincide with the flow velocity - liquid level scatter plot, and the corresponding siltation thickness is the siltation thickness in the pipeline.

2. The method for calculating the siltation thickness of a sewage pipeline according to claim 1, wherein, The size data includes the pipeline radius, hydraulic gradient and pipeline roughness coefficient.

3. The method for calculating the siltation thickness of a sewage pipeline according to claim 1, wherein, When the pipeline fullness ≤ 50%, calculating the hydraulic radius includes: Calculate the wetted perimeter under the siltation state as: Calculate the cross - sectional area of flow under the siltation state as: Calculate the hydraulic radius according to the wetted perimeter and the cross - sectional area of flow.

4. The method for calculating the siltation thickness of a sewage pipeline according to claim 3, wherein, Calculate the hydraulic radius by the following formula:

5. The method for calculating the siltation thickness of a sewage pipeline according to claim 1, wherein, When the pipeline fullness > 50%, calculating the hydraulic radius includes: Calculate the wetted perimeter under the siltation state as: Calculate the cross - sectional area of flow under the siltation state as: Calculate the hydraulic radius according to the wetted perimeter and the cross - sectional area of flow.

6. The method for calculating the siltation thickness of a sewage pipeline according to claim 5, wherein, Calculate the hydraulic radius by the following formula:

7. An on-line monitoring device for the siltation thickness of a sewage pipeline, characterized in that, Including: A liquid level monitoring module to obtain the liquid level height of the sewage in the pipeline in real time; A flow velocity monitoring module to obtain the average flow velocity of the sewage in the pipeline in real time; A monitoring data transmission module to transmit the real - time data of the liquid level height and the average flow velocity to the siltation discrimination calculation module; A monitoring equipment power supply module to provide power for the liquid level monitoring module, the flow velocity monitoring module and the monitoring data transmission module; A siltation discrimination calculation module for performing the following steps: Obtain the size data of the sewage pipeline; Obtain the liquid level height and average flow velocity of the sewage pipeline; Calculate the hydraulic radius, and construct the flow velocity - liquid level relationship equation under the siltation state, which is the pipeline siltation model; Fit through the liquid level height, the average flow velocity and the pipeline siltation model to calculate the siltation thickness; Wherein, when the pipeline fullness ≤ 50%, the pipeline siltation model is: Wherein, when the pipeline fullness > 50%, the pipeline siltation model is: Wherein, r is the pipeline radius, h is the liquid level height, t is the siltation thickness, ν is the flow velocity, n is the pipeline roughness coefficient, and I is the hydraulic gradient; Wherein, fitting through the pipeline liquid level, the average flow velocity and the pipeline siltation model to calculate the siltation thickness includes: Draw a flow velocity - liquid level scatter plot through the pipeline liquid level and the average flow velocity; Draw a flow velocity - liquid level curve according to the pipeline siltation model; Adjust the value of the siltation thickness in the pipeline siltation model to make the flow velocity - liquid level curve coincide with the flow velocity - liquid level scatter plot, and the corresponding siltation thickness is the siltation thickness in the pipeline.

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