A monitoring and early warning method for an urban underground pipe network system

Abstract

The present invention relates to the field of urban infrastructure monitoring, and discloses a monitoring and early warning method for an urban underground pipe network system. By dividing the monitoring area into several monitoring regions and assigning a leak detection unit to each monitoring region, the underground pipes in each region are monitored and managed separately. By analyzing the water level data between two adjacent leak detection units collected, obvious leak situations are initially detected. By using the tracer gas method to inject a tracer gas with a known concentration into each leak detection unit where no obvious leakage situation is detected, the leakage rate is analyzed and calculated to further detect whether there are minor leaks. By combining the analysis of the aging degree of some parts where no minor leaks are detected, key monitoring is carried out on them. Finally, early warning is given for the leak detection results, which is beneficial to accurately analyze the leak situation, more precisely locate the position of the leak and the leakage situation.

Description

Technical Field

[0001] The present invention relates to the technical field of urban infrastructure monitoring, and more particularly to a monitoring and early warning method for an urban underground pipe network system. Background Art

[0002] With the advancement of urban construction, the underground pipe network system has become increasingly complex and large-scale, including water supply pipe networks, sewage pipe networks, and rainwater pipe networks. These pipe systems play a crucial role in ensuring the normal operation of the city. However, over time and due to external factors such as geological changes, engineering construction, and pipe material aging, water leakage may occur in the underground pipe system. Especially for sewage and rainwater pipes, once leakage occurs, it will not only lead to waste of resources but also may cause a series of serious problems.

[0003] Currently, the management and maintenance of urban underground pipe networks face many challenges. Due to the concealed layout of underground pipelines and the complex spatial environment, traditional detection methods often require remedial measures after obvious water leakage or collapse is discovered. The traditional detection methods mainly include the following:

[0004] (1) Using endoscopic equipment for internal inspection of pipes, but this method requires specialized equipment and manual operation, with low detection efficiency and it is difficult to achieve real-time monitoring and early warning for large-scale pipe networks;

[0005] (2) Using means such as sound waves and ground penetrating radar to detect underground cavities and water leakage points, this method has high requirements for equipment and technology and is easily affected by the environment, and the accuracy and sensitivity of the detection results are limited;

[0006] (3) Inferring possible problems in the underground pipe network by monitoring surface anomalies such as ground settlement and cracks. Such methods are slow to take effect and often discover problems only after obvious ground collapse or damage occurs, making it difficult to achieve early prevention. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention provides a monitoring and early warning method for an urban underground pipe network system to solve the problems existing in the above-mentioned background art.

[0008] The present invention provides the following technical solution: A monitoring and early warning method for an urban underground pipe network system, comprising:

[0009] S1: Divide the monitoring area into several monitoring areas according to the positions of water wells, and assign a leak detection unit to each monitoring area, and conduct separate monitoring and management of the underground pipes in each area;

[0010] S2: Install a liquid level sensor in the water well to monitor the water surface height in real time, collect the water level data in each leak point detection unit, and transmit the liquid surface height data monitored in real time to the monitoring center through the wireless communication network via the liquid level sensor;

[0011] S3: Analyze the water level data between two adjacent leak point detection units collected, calculate the water level difference, leakage flow rate and the specific location of the leakage point between adjacent inspection wells. Based on the water level difference between adjacent inspection wells, preliminarily screen the leak point detection units where underground pipeline leak points occur. If leakage is detected, transmit the leak point detection result to S6, and locate the leak point according to the leakage flow rate. If no leakage is detected, continue to conduct further leakage detection and analysis on the inside of the underground pipe network;

[0012] S4: Based on further leakage analysis of the inside of the underground pipe network, inject a tracer gas with a known concentration into each leak point detection unit where no obvious leakage is detected by using the tracer gas method, analyze and calculate the leakage rate, so as to further detect whether there are minor leak points, and transmit the detection result of the minor leak points to S6;

[0013] S5: Through the combined analysis of the aging degree of some parts where no minor leak points are detected, conduct key monitoring on them, and transmit the monitoring result to S6 for real-time feedback;

[0014] S6: Used to provide real-time feedback on the monitoring results of the underground pipe network and give early warnings for the leak point detection results.

[0015] Preferably, in S1, with each water well as the center point, the entire monitoring area is divided into multiple monitoring sub-areas, each monitoring sub-area is set as a leak point detection unit, and each leak point detection unit is numbered sequentially as 1, 2, 3... n. The underground pipeline water level data in each divided monitoring sub-area is monitored and managed through the leak point detection unit.

[0016] Preferably, in S2, the liquid level sensor monitors the water level change in the water well in real time, converts the liquid surface height data monitored by the liquid level sensor into an electrical signal, and the built-in data processing unit of the sensor converts the electrical signal into a digital signal for preliminary processing, and then sends the processed data to the monitoring center through the wireless communication network, so as to collect the water level data, including the water level height and the change rate.

[0017] Preferably, when there is a leak in the pipeline in S3, the water level of the leak detection unit at the location of the leak point will drop rapidly. Due to the drop in the leak point water level, a water level difference will be formed between adjacent inspection wells. Whether there is a leak inside the underground pipe network is detected based on the water level difference, so as to detect whether there is an obvious leak point in the pipeline. When the system detects that the water level difference between an inspection well and the inspection wells around it increases abnormally, a potential leak point can be identified. By monitoring the water level change data and analyzing the water level difference, the specific location of the leak point and the water leakage flow can be further calculated;

[0018] The specific calculation formula for the water level difference between adjacent inspection wells is , where represents the water level of the detection well i, represents the water level of the detection well i-1, and the wells i and i-1 represent two adjacent wells; by setting a water level difference threshold , the water level difference between adjacent inspection wells is compared with the water level difference threshold to detect whether there is an obvious leakage situation. If , it indicates that no obvious leakage has been detected in the underground pipeline between adjacent inspection wells. Then, the leak detection unit where no obvious leakage has been detected is further analyzed for leakage detection; if , it indicates that an obvious leakage has been detected in the underground pipeline between adjacent inspection wells. Then, all the leak detection units where obvious leakage has been detected at this time are screened out, and the specific location and water leakage flow of the leak points in the screened leak detection units are further analyzed and located;

[0019] The specific calculation formula for the water leakage flow is , where A represents the water leakage cross-sectional area at the leak point, g represents the acceleration due to gravity, represents the horizontal distance between two wells;

[0020] When an abnormal water level difference is detected, it can be assumed that the leak point is located between two inspection wells. The analysis method for the specific location of the leak point is as follows:

[0021] The distance from the leak point to the inspection well i is ,

[0022] The distance from the leak point to the inspection well i-1 is , where represents the average value of the water levels of the two inspection wells, represents the water level difference between adjacent inspection wells;

[0023] By analyzing and calculating the leakage flow rate and the specific location of the leakage point, the leakage point location and leakage situation can be accurately located, and the analysis results are transmitted to S6.

[0024] Preferably, S4 collects air samples near potential leakage points of the pipeline using detectors or sampling devices, detects the concentration of tracer gas in the samples using a gas analyzer, and further analyzes the underground pipeline of the leakage point detection unit where no obvious leakage situation is detected based on the tracer gas concentration, so as to detect whether there are subtle leakage points with unobvious leakage;

[0025] The leakage rate is calculated according to the detected tracer gas concentration and known injection conditions, and its specific calculation formula is , where represents the leakage rate of the i-th leakage point detection unit where no obvious leakage situation is detected, represents the concentration of tracer gas detected near the leakage point in the i-th leakage point detection unit where no obvious leakage situation is detected, represents the flow rate of the tracer gas injected into the pipeline in the i-th leakage point detection unit where no obvious leakage situation is detected, represents the initial concentration of the injected tracer gas in the pipeline, D represents the diffusion coefficient, represents a constant, k represents the Boltzmann constant, represents the time from injecting the tracer gas to detecting the leakage in the i-th leakage point detection unit where no obvious leakage situation is detected;

[0026] By using quantitative analysis method to analyze the leakage rate, determine the leakage point, and then judge the location of the leakage point according to the detected tracer concentration gradient, so as to detect the leakage point detection unit with subtle leakage points, mark the leakage point location, and transmit the detection results to S6. At the same time, continue to monitor and analyze the leakage point detection units where no subtle leakage points are still detected.

[0027] Preferably, S5 analyzes and calculates the aging degree of the underground pipeline in the leakage point detection unit where no subtle leakage points are detected, and focuses on monitoring the changes in the pipeline based on the aging degree of the underground pipeline in each leakage point detection unit where no subtle leakage points are detected.

[0028] Preferably, S6 gives an alarm prompt for the leakage detection situation of the leakage point and records the location of the abnormality. At the same time, it warns the management terminal of the potential risk of road surface collapse and sends a risk prompt message.

[0029] The technical effects and advantages of the present invention:

[0030] The present invention divides the monitoring area into several monitoring areas according to the positions of the water wells, and assigns a leak detection unit to each monitoring area. Based on the separate monitoring and management of the underground pipelines in each area, a liquid level sensor is installed in the water well to monitor the water surface height in real time and collect the water level data in each leak detection unit. By analyzing the water level data between two adjacent leak detection units collected, the water level difference, leakage flow rate, and the specific location of the leakage point between adjacent inspection wells are calculated. By using the tracer gas method, a tracer gas with a known concentration is injected into each leak detection unit where no obvious leakage is detected, and the leakage rate is analyzed and calculated to further detect whether there are minor leak points. By combining the analysis of the aging degree of some areas where no minor leak points are detected, key monitoring is carried out on them. Finally, through the real-time feedback of the monitoring results of the underground pipeline network and the early warning of the leak detection results, it is beneficial to gradually check and detect the entire underground pipeline, divide the areas for monitoring, accurately analyze the leak situation, more conveniently, quickly, and accurately locate the position and leakage situation of the leak point, understand the size of the leak point and the leakage state, and process it immediately, which can greatly save the waste of manpower and material resources, solve the problem of time-consuming and laborious search and positioning of leak points, and can effectively process according to the leak situation, effectively saving the time for pipeline network monitoring and maintenance. At the same time, it can also timely find and eliminate the risk of pipeline leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flowchart of the method steps of the present invention.

[0032] Figure 2 It is a block diagram of the system structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. In addition, the forms of each structure described in the following embodiments are merely examples, and a monitoring and early warning method for an urban underground pipeline network system involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] As Figure 1 shown, this embodiment provides a monitoring and early warning method for an urban underground pipeline network system, including:

[0035] S1: Divide the monitoring area into several monitoring areas according to the positions of the water wells, and assign a leak detection unit to each monitoring area, and perform separate monitoring and management on the underground pipelines in each area.

[0036] In this embodiment, in S1, with each water well as the center point, the entire monitoring area is divided into multiple monitoring sub-areas, and each monitoring sub-area is set as a leak point detection unit. Then, each leak point detection unit is numbered sequentially as 1, 2, 3... n. The underground pipeline water level data in each divided monitoring sub-area is monitored and managed through the leak point detection unit.

[0037] Specifically, assume a city area with 100 water wells. The area covered by each water well with a radius of 500 meters is a monitoring sub-area. Thus, the entire monitoring area is divided into 100 monitoring sub-areas, and each monitoring sub-area is set as a leak point detection unit, that is, each monitoring sub-area has a water well as the center and a radius of 500 meters. If the pipelines in a certain area are severely aged and historical leakage data shows frequent leakage in this area, then this area can be further divided into smaller monitoring areas. For example, the coverage radius of each water well is reduced to 300 meters.

[0038] S2: Install a liquid level sensor in the water well to monitor the water surface height in real time and collect the water level data in each leak point detection unit. The liquid level sensor transmits the real-time monitored liquid surface height data to the monitoring center through a wireless communication network.

[0039] In this embodiment, in S2, the liquid level sensor monitors the water level change in the water well in real time, converts the real-time monitored liquid surface height data into an electrical signal, and the built-in data processing unit of the sensor converts the electrical signal into a digital signal for preliminary processing. Then, the processed data is sent to the monitoring center through a wireless communication network, thereby collecting water level data, including the water level height and the change rate.

[0040] Specifically, according to the depth of the water well, the water quality situation, and environmental factors such as temperature, a suitable liquid level sensor is selected, including ultrasonic liquid level sensors, pressure liquid level sensors, and float liquid level sensors. For the installation position of the liquid level sensor, it is necessary to consider whether it can reflect the position of the water level change and avoid installing it in a position prone to interference to prevent affecting the accuracy of water level measurement. For the monitoring center, corresponding receiving devices should be equipped, including servers and data receiving terminals, to receive data from the liquid level sensor and store the received data in a database for historical data analysis and future trend prediction.

[0041] S3: Analyze the water level data between two adjacent leak detection units collected, calculate the water level difference between adjacent inspection wells, the leakage flow rate, and the specific location of the leakage point. Based on the water level difference between adjacent inspection wells, preliminarily screen the leak detection units for whether there is a leak in the underground pipeline. If a leakage situation is detected, transmit the leak detection result to S6, and locate the leak point according to the leakage flow rate. If no leakage situation is detected, continue to conduct further leakage detection and analysis on the interior of the underground pipe network.

[0042] In this embodiment, when the pipeline leaks, the water level of the leak detection unit at the leak location will drop rapidly. Due to the drop in the leak water level, a water level difference will form between adjacent inspection wells. According to the water level difference, detect whether there is a leak inside the underground pipe network, so as to detect whether there is an obvious leak point in the pipeline. When the system detects that the water level difference between a certain inspection well and its surrounding inspection wells increases abnormally, a potential leak point can be identified. By monitoring the water level change data and analyzing the water level difference, the specific location of the leak point and the leakage flow rate can be further calculated.

[0043] The specific calculation formula for the water level difference between adjacent inspection wells is , where represents the water level of the inspection well i, represents the water level of the inspection well i - 1, and the inspection well i and the inspection well i - 1 represent two adjacent inspection wells; by setting a water level difference threshold , compare the water level difference between adjacent inspection wells with the water level difference threshold to detect whether there is an obvious leakage situation. If , it indicates that no obvious leakage situation is detected in the underground pipeline between adjacent inspection wells, then conduct further leakage detection and analysis on the leak detection units where no obvious leakage situation is detected; if , it indicates that an obvious leakage situation is detected in the underground pipeline between adjacent inspection wells, then screen out all the leak detection units where an obvious leakage situation is detected at this time, and continue to further analyze and locate the specific location of the leak point and the leakage flow rate in the selected leak detection units;

[0044] The specific calculation formula for the leakage flow rate is , where A represents the leakage cross-sectional area at the leak point, g represents the acceleration due to gravity, represents the horizontal distance between two inspection wells;

[0045] When an abnormal water level difference is detected, it can be assumed that the leak point is located between two inspection wells. Then the analysis method for the specific location of the leak point is:

[0046] The distance from the leak point to the inspection well i is ,

[0047] The distance from the leakage point to inspection well i - 1 is , where represents the average water level of two inspection wells, represents the water level difference between adjacent inspection wells;

[0048] By analyzing and calculating the leakage flow rate and the specific location of the leakage point, the leakage point location and leakage situation can be accurately located, and the analysis results are transmitted to S6.

[0049] Specifically, the principle of detecting the leakage point through the water level difference between adjacent inspection wells includes: when the pipeline leaks, the water level at the leakage point will drop rapidly. Since the water flows outwards from the leakage point, the pressure around the leakage point decreases, showing a lower water level; due to the drop in the water level at the leakage point, a water level difference will form between adjacent inspection wells. According to the principle of communicating vessels, if a section of the pipeline system leaks, the water levels of the inspection wells connected by the communicating pipes will show inconsistency; in order to balance the water loss, the water will flow from the inspection well with a higher surrounding water level to the leakage point with a lower water level; at this time, the water flow near the leakage point will increase significantly, forming a funnel - like water flow pattern; the water level changes of each inspection well are monitored in real - time, especially the water level difference between two adjacent inspection wells; when the system detects that the water level difference between an inspection well and its surrounding inspection wells increases abnormally, a potential leakage point can be identified; the analysis and determination of the specific location of the leakage point are determined according to the distances from the leakage point to two inspection wells respectively.

[0050] S4: Based on further leakage analysis of the underground pipe network, by using the tracer gas method to inject a tracer gas with a known concentration into each leak - point detection unit that has not detected obvious leakage, analyze and calculate the leakage rate, so as to further detect whether there are minor leakage points, and transmit the detection results of the minor leakage points to S6.

[0051] In this embodiment, S4 collects air samples near the potential leakage points of the pipeline by using detectors or sampling devices, uses a gas analyzer to detect the concentration of the tracer gas in the samples, and further analyzes the underground pipeline of the leak - point detection unit that has not detected obvious leakage based on the concentration of the tracer gas, so as to detect whether there are minor leakage points with unobvious leakage;

[0052] The leakage rate is calculated according to the detected tracer gas concentration and known injection conditions, and its specific calculation formula is , where represents the leakage rate of the i - th leak - point detection unit that has not detected obvious leakage, Denote the concentration of the tracer gas detected near the leakage point in the $i$-th leak detection unit where no obvious leakage is detected. Denote the flow rate of the tracer gas in the injection pipeline in the $i$-th leak detection unit where no obvious leakage is detected. Denote the initial concentration of the injected tracer gas in the pipeline, and $D$ denotes the diffusion coefficient. Denote a constant, and $k$ denotes the Boltzmann constant. Denote the time from injecting the tracer gas to detecting the leakage in the $i$-th leak detection unit where no obvious leakage is detected.

[0053] By using the quantitative analysis method to analyze the leakage rate, determine the leakage point, and then judge the position of the leakage point according to the detected tracer concentration gradient, so as to detect the leak detection unit with fine leakage points, mark the position of the leakage point, and then transmit the detection result to S6. At the same time, continue to monitor and analyze the leak detection units that still have not detected fine leakage points.

[0054] It should be specifically noted that the method of detecting leakage points by analyzing the water level drop rate is only applicable to the situation where the leakage of the leakage point is very obvious. If the leakage point is not very large or very small, it is impossible to detect it immediately by directly analyzing the water flow rate. It is necessary to consider both the size of the leakage point and the special position where the leakage point is located. Although there is a leakage point in the underground pipe network, there is no sign of water leakage. At this time, the state of detecting and warning the leakage point can effectively capture tiny leakage points through the tracer gas method; the tracers selected are sulfur hexafluoride (SF6) and helium. The specific operation steps for detecting leakage points by the quantitative analysis method include:

[0055] Close other inlets of the system to be detected to ensure the stability of the system pressure.

[0056] Inject the tracer into the system and record the injection volume and injection time.

[0057] Install a concentration detection instrument at the system outlet to monitor the tracer concentration in real time.

[0058] Calculate the leakage rate according to the change of the tracer concentration over time.

[0059] According to the leakage rate, compare the leakage rates of each leak detection unit, find the unit with a higher leakage rate, preliminarily determine the leakage point, and install a concentration detection probe near the leak detection unit with a higher leakage rate.

[0060] Monitor the tracer concentration gradient in real time. The position with a larger concentration gradient is the leakage point, and mark the position of the leakage point for subsequent repair.

[0061] S5: By comprehensively analyzing the aging degree of some undetected minor leakage points, key monitoring is carried out on them, and the monitoring results are transmitted to S6 for real-time feedback.

[0062] In this embodiment, S5 analyzes and calculates the aging degree of the underground pipelines in the leakage point detection units where no minor leakage points are detected, and focuses on monitoring the changes in the pipelines based on the aging degree of the underground pipelines in each leakage point detection unit where no minor leakage points are detected.

[0063] Specifically, the specific calculation formula for the aging degree is , where K represents the aging degree of the underground pipeline in the i-th leakage point detection unit where no minor leakage points are detected, S represents the pipeline material and structural characteristics, T represents the pipeline usage time, represents the corrosion rate of the pipeline, represents the environmental impact factor.

[0064] S6: Used to provide real-time feedback on the monitoring results of the underground network management and give early warnings on the leakage point detection results.

[0065] In this embodiment, S6 gives an alarm prompt for the leakage detection situation of the leakage point and records the location of the abnormality. At the same time, it warns the management terminal of the potential road surface collapse risk and sends a risk prompt message.

[0066] As Figure 2 shown, this embodiment provides an implementation system corresponding to the monitoring and early warning method for an urban underground pipeline network system, including a regional division module, a data acquisition module, a preliminary leakage point screening module, a leakage point detection and analysis module, a pipeline monitoring module, and an early warning and feedback module. The regional division module is connected to the data acquisition module, the data acquisition module is connected to the preliminary leakage point screening module, the preliminary leakage point screening module is connected to the leakage point detection module, the preliminary leakage point screening module is connected to the early warning and feedback module, the leakage point detection and analysis module is connected to the pipeline monitoring module, the pipeline monitoring module is connected to the early warning and feedback module, and the pipeline monitoring module is connected to the early warning and feedback module.

[0067] The regional division module divides the monitoring area into several monitoring areas according to the positions of the water wells, assigns a leakage point detection unit to each monitoring area, and separately monitors and manages the underground pipelines in each area;

[0068] The data acquisition module installs a liquid level sensor in the water well to monitor the water surface height in real time, collects the water level data in each leakage point detection unit, and transmits the real-time monitored liquid level height data to the monitoring center through a wireless communication network;

[0069] The initial leakage point screening module analyzes based on the water level data between two adjacent leakage point detection units collected, calculates the water level difference between adjacent inspection wells, the leakage flow rate, and the specific location of the leakage point, and preliminarily screens the leakage point detection units where underground pipeline leakage points occur according to the water level difference between adjacent inspection wells;

[0070] The leakage point detection and analysis module conducts further leakage analysis on the interior of the underground pipe network. By using the tracer gas method, a tracer gas with a known concentration is injected into each leakage point detection unit that has not detected obvious leakage conditions, and the leakage rate is analyzed and calculated to further detect whether there are minor leakage points;

[0071] The pipeline monitoring module focuses on monitoring a part of the pipelines by comprehensively analyzing the aging degree of those without minor leakage points detected;

[0072] The early warning feedback module is used to provide real-time feedback on the monitoring results of the underground pipe network and give early warnings on the leakage point detection results.

[0073] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0074] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claimed rights.

Claims

1. A monitoring and early warning method for an urban underground pipe network system, characterized in that: include: S1: The monitoring area is divided into several monitoring areas according to the location of the water wells, and a leakage detection unit is assigned to each monitoring area, so that the underground pipelines in each area are monitored and managed separately; S2: Install a liquid level sensor in the water well to monitor the water level in real time and collect water level data in each leak detection unit. The liquid level sensor transmits the real-time monitored liquid level data to the monitoring center through a wireless communication network. S3: Analyze the collected water level data between two adjacent leakage detection units, calculate the water level difference between adjacent inspection wells, the leakage flow rate and the specific location of the leakage point, and preliminarily screen the leakage detection units for underground pipeline leakage according to the water level difference between adjacent inspection wells. If leakage is detected, transmit the leakage detection result to S6, and locate the leakage point according to the leakage flow rate. If no leakage is detected, continue to conduct further leakage detection and analysis inside the underground pipe network; By monitoring water level change data and analyzing water level difference, the specific location of the leakage point and leakage flow can be further calculated; The specific calculation formula for the water level difference between adjacent inspection wells is: ,in, Indicates the water level of the detection well i, Indicates the water level of the detection well i-1, and well i and well i-1 represent two adjacent wells; by setting a water level difference threshold , the water level difference between adjacent inspection wells Water level difference threshold Compare to see if there is any obvious leakage. When , it indicates that no obvious leakage is detected in the underground pipeline between the adjacent inspection wells, then the leakage point detection unit that has not detected obvious leakage will be further leaked. , indicating that the underground pipeline between the adjacent inspection water wells has obvious leakage, then all the leakage point detection units that have detected obvious leakage at this time are screened out, and the specific location and leakage flow of the leakage point in the screened leakage point detection units are further analyzed and located; The specific calculation formula for the leakage flow is: , where A represents the leaking cross-sectional area at the leaking point, g represents the acceleration of gravity, Indicates The well of the leakage detection unit Horizontal distance between the water wells of each leakage detection unit; When an abnormal water level difference is detected, it can be assumed that the leak point is between the two inspection wells. The specific location of the leak point can be analyzed as follows: The distance between the leakage point and the inspection well i is , The distance between the leakage point and the inspection well i-1 is ,in, represents the average water level of the two inspection wells, Indicates the water level difference between adjacent inspection wells; By analyzing and calculating the leakage flow and the specific location of the leakage point, the leakage point and leakage situation can be accurately located, and the analysis results are transmitted to S6; S4: Based on further leakage analysis inside the underground pipe network, by using the tracer gas method to inject a known concentration of tracer gas into each leak detection unit where no obvious leakage is detected, the leakage rate is analyzed and calculated, so as to further detect whether there are subtle leaks, and transmit the detection results of the subtle leaks to S6; S5: By analyzing the aging degree of a part of the equipment that has no minor leaks, the equipment is monitored in detail and the monitoring results are transmitted to S6 for real-time feedback; S6: It is used to provide real-time feedback on the monitoring results of underground network management and to issue early warnings on leakage detection results.

2. A monitoring and early warning method for an urban underground pipe network system according to claim 1, characterized in that: The S1 divides the entire monitoring area into multiple monitoring sub-areas with each water well as the center point, and sets each monitoring sub-area as a leakage detection unit. Each leakage detection unit is numbered 1, 2, 3...n in sequence, and the underground pipeline water level data in each divided monitoring sub-area is monitored and managed through the leakage detection unit.

3. The monitoring and early warning method for an urban underground pipe network system according to claim 1 is characterized in that: The S2 collects water level data, including water level height and change rate, by using a liquid level sensor to monitor the water level changes in the well in real time, converting the water surface height data monitored by the liquid level sensor in real time into an electrical signal, and the built-in data processing unit of the sensor converts the electrical signal into a digital signal for preliminary processing, and then sends the processed data to the monitoring center through a wireless communication network.

4. A monitoring and early warning method for an urban underground pipe network system according to claim 1, characterized in that: When a leak occurs in the pipeline, the water level of the leak detection unit at the leak point will drop rapidly. As the water level at the leak point drops, a water level difference will be formed between adjacent inspection wells. The water level difference is used to detect whether there is a leak inside the underground pipeline network, thereby detecting whether there is an obvious leak in the pipeline. When the system detects that the water level difference between an inspection well and its surrounding inspection wells is increasing, the potential leak point can be identified.

5. The monitoring and early warning method for an urban underground pipe network system according to claim 1 is characterized in that: The S4 collects air samples near the potential leakage point of the pipeline using a detector or sampling equipment, detects the tracer gas concentration in the sample using a gas analyzer, and further analyzes the underground pipeline of the leakage detection unit where no obvious leakage is detected based on the tracer gas concentration, thereby detecting whether there is a subtle leakage point with inconspicuous leakage; The leakage rate is calculated based on the detected tracer gas concentration and known injection conditions. The specific calculation formula is: ,in, represents the leakage rate of the i-th leakage detection unit that did not detect obvious leakage, represents the tracer gas concentration detected near the leak point in the i-th leak detection unit where no obvious leak is detected. represents the flow rate of tracer gas injected into the pipeline in the i-th leak detection unit where no obvious leakage is detected, represents the initial concentration of the injected tracer gas in the pipeline, D represents the diffusion coefficient, represents a constant, k represents the Boltzmann constant, It represents the time from the injection of tracer gas to the detection of leakage in the i-th leakage detection unit where no obvious leakage is detected; The leakage rate is analyzed by using a quantitative analysis method to determine the leakage point, and the position of the leakage point is determined based on the detected tracer concentration gradient, so that the leakage detection unit with a slight leakage point is detected, and the leakage point position is marked, and the detection result is transmitted to S6. At the same time, the leakage detection unit that has not detected a slight leakage point continues to be monitored and analyzed.

6. A monitoring and early warning method for an urban underground pipe network system according to claim 1, characterized in that: The S5 analyzes and calculates the aging degree of the underground pipelines in the leakage detection units where no minute leaks are detected, and focuses on monitoring the changes in the pipelines based on the aging degree of the underground pipelines in each leakage detection unit where no minute leaks are detected.

7. A monitoring and early warning method for an urban underground pipe network system according to claim 1, characterized in that: The S6 issues an alarm for the leakage detection situation of the leak point and records the location of the abnormality. At the same time, it warns the management terminal of the potential risk of road collapse and sends risk warning information.

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