CN111623250A - Water body leakage amount measuring method and system and pipeline - Google Patents
Water body leakage amount measuring method and system and pipeline Download PDFInfo
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- CN111623250A CN111623250A CN202010460451.9A CN202010460451A CN111623250A CN 111623250 A CN111623250 A CN 111623250A CN 202010460451 A CN202010460451 A CN 202010460451A CN 111623250 A CN111623250 A CN 111623250A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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- F17D5/00—Protection or supervision of installations
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Abstract
The invention discloses a method, a system and a pipeline for measuring water leakage, wherein a marker is put into flowing water, a pulse signal generated when the marker is captured by a marker detection unit is used for identifying the water, and the volume of the water flowing through an upstream measuring section and the volume of the water flowing through a downstream measuring section are determined; and calculating the difference between the water volume of the upstream measurement section and the water volume of the downstream measurement section to obtain the seepage/leakage of the water flowing through the section between the upstream measurement section and the downstream measurement section. The measuring method provided by the invention makes up the defects of the existing water body leakage quantity measuring method and greatly improves the measuring precision.
Description
Technical Field
The invention relates to a water leakage measuring technology of an underground drainage pipeline, in particular to a water leakage measuring method, a water leakage measuring system and a pipeline.
Background
In the process of high-speed economic development in China, urbanization construction is rapidly developed, urban population is rapidly increased, urban area is rapidly enlarged, construction and maintenance of urban underground drainage pipe networks are seriously lagged, rain and sewage mixed connection, settlement dislocation, old urban pipeline damage, cracks, collapse and other functional defects of drainage pipelines are frequently seen, pollution of surface water and underground water is increasingly aggravated, physical health of urban residents is seriously affected, and sustainable and healthy development of economy in China is restricted.
At present, the method for exploring the defects of urban underground drainage pipelines mainly comprises the following steps: television detection (CCTV detection), sonar detection, pipeline periscope detection (QV detection), pipeline detection robotics, pipeline scanning and evaluation technology (SSET), focusing electrode leakage locator, scanning electron microscope, multiple Sensors (SAM), and the like. In many of the above exploration techniques, the imaging technique is often used to analyze the defects of the pipeline wall images to determine the positions, shapes and sizes of the defects, but the water permeability or the sealing property of the defects such as cracks, damages or misplacement of the pipeline cannot be determined, and the infiltration amount of groundwater or the leakage amount of water in the pipeline cannot be analyzed and calculated. When the wall surface of the pipeline is cracked, damaged or misplaced and has good water permeability, the following consequences are caused: (1) in the early stage of rainfall, the ground rainwater is rapidly gathered into the pipeline, the water level in the pipeline is higher than the underground water level outside, and the domestic sewage and the industrial wastewater of the combined pipeline or the rainwater-sewage mixed pipeline are leaked from the defect of the pipeline and directly enter the soil to cause soil pollution and underground water and surface water pollution; (2) at the rainfall later stage, ground rainwater is catched and is reduced, and pipeline outside soil ground water level risees, and when the inside water level of pipeline was less than outside ground water level, groundwater was inside from the infiltration of pipeline defect department, caused the pipeline water yield to increase, directly leads to sewage treatment plant's influent pollutant concentration to reduce, and the operation water yield load increases, and the operating efficiency reduces, has increaseed sewage treatment plant's operation load and running cost. In order to analyze and judge the defects of the pipeline and the water permeability of the defects and provide a basis for pipeline repair schemes and repair measures, a method for measuring the water leakage of underground drainage pipelines is needed.
The existing method for measuring the water leakage of the pipeline mainly comprises a static water method, a flow method and an indirect measurement method. The static water method is to block the upstream and downstream ports of the pipeline in the adjacent inspection wells, and calculate the leakage amount by observing the change of the water level in the pipeline along with the time. The flow method is to calculate the leakage by measuring the flow difference between two measuring sections at the upstream and the downstream of the pipeline, the basic premise of the method is that the flow of the incoming flow at the upstream of the pipeline is assumed to be constant flow state, however, the daily water consumption of residents is relatively large, the peak water consumption is more than 2 times of the normal water consumption, the pipeline water flow is in a non-constant flow state, the error of the measurement by the flow method is relatively large, and even the opposite situation occurs. The indirect measurement method is to analyze and judge by using the change of the pollutant index. However, when the external water contaminant index is comparable to the internal water contaminant index, the amount of leakage cannot be measured; when the external water pollutant index and the internal water index have larger difference and the infiltration amount is larger, although the external water infiltration can be qualitatively judged, the quantitative measurement cannot be carried out; indirect measurement cannot measure the amount of leakage.
Disclosure of Invention
The invention aims to solve the technical problem that the prior art is insufficient, and provides a method and a system for measuring the water leakage amount of a pipeline and the pipeline, so that the water leakage amount of the pipeline can be accurately measured.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a water body leakage amount measuring method comprises the following steps:
s1, identifying the water body by using pulse signals generated when the marker is captured by the marker detection unit on the upstream measurement section and the downstream measurement section respectively, and determining the volume of the water body flowing through the upstream measurement section and the volume of the water body flowing through the downstream measurement section;
and S2, calculating the difference between the water volume of the upstream measuring section and the water volume of the downstream measuring section to obtain the seepage/leakage of the water flowing through the section between the upstream measuring section and the downstream measuring section.
The method has the advantages that the marker is added into the water body, the marker detection unit generates the pulse signal by utilizing the marker, the water body is identified, the volume of the water body flowing through the upstream measuring section and the volume of the water body flowing through the downstream measuring section are further determined, and the leakage amount of the water body flowing through the upstream and downstream measuring section sections is obtained.
To facilitate the implementation of step S1 and step S2, before step S1, the following operations are also performed: putting markers into a flowing water body with a section measured upstream twice; the time interval between the two shots is t, and the time interval t is less than the time for the water flow to migrate from the upstream port to the downstream port. The marker is put into the water body in two times, two pulse signals can be generated on the upstream measuring section and the downstream measuring section respectively, and the upstream boundary and the downstream boundary of the water body can be conveniently determined.
The specific implementation process of step S1 includes: after the markers are put into the upstream measurement section twice, two first pulse signals generated when the markers pass through and captured by the marker detection unit at the upstream measurement section and two second pulse signals generated when the markers pass through and captured by the marker detection unit at the downstream measurement section are recorded, and the volume of the water body flowing through the upstream measurement section in a time period between the two first pulse signals and the volume of the water body flowing through the downstream measurement section in a time period between the two second pulse signals are calculated. When the marker is an electrolyte solution, the basic principle of measurement is: the electrolyte solution is delivered to a specific flowing water body twice, and the water body at the delivery position becomes a high-conductivity water body, so that the section of flowing water body has upstream and downstream boundaries and identifiability with high conductivity. When the electrolyte solution flows through the conductivity sensor, the conductivity meter generates two high conductivity peak pulses, and the water body between the two pulses is the specific water body. Identifying the upstream and downstream boundaries of the section of water body by using a conductivity meter on the upstream measurement section, synchronously measuring the flow process and the elapsed time, and calculating the volume of the water body; in the same way, the section of water body is identified again on the downstream measuring section, and the flow process and the elapsed time are synchronously measured again to calculate the volume of the water body.
After step S1, the method further includes: and calculating the water permeability by using the water volume of the upstream measuring section and the water volume of the downstream measuring section. When water flows in the pipeline, the division standard of the defect damage degree of the pipeline is determined by utilizing the water permeability, namely the water permeability of the pipeline can be calculated by utilizing the ratio of the absolute value of the difference between the volumes of the two water bodies to the volume of the upstream water body, the water permeability reflects the water permeability of the pipeline, and the larger the water permeability is, the higher the defect damage degree of the pipeline is. According to the water permeability, a division standard of the defect damage degree of the pipeline can be formulated. The division standard set by the invention comprises the following steps: when the water permeability k is less than 5%, the pipeline is impervious; when k is more than or equal to 5% and less than 10%, the pipeline is slightly permeable; when k is more than or equal to 10% and less than 15%, the pipeline is weak and permeable; when k is more than or equal to 15% and less than 20%, the pipeline is permeated with water; when k is more than or equal to 20%, the pipeline is strong and permeable.
In order to facilitate the processes of detecting the marker and measuring the flow, at least one marker detection unit and at least one flow measurement unit are respectively arranged at the upstream measuring section and the downstream measuring section. Preferably, the marker detection unit is a conductivity meter; the flow measurement unit is a cross-correlation flow meter or a Doppler flow meter.
The marker is high-concentration electrolyte solution, and has good conductivity, strong pulse signal and low cost; preferably, the electrolyte solution is a NaCl solution with a concentration of 25% by mass. The higher the concentration, the greater the conductivity, and the stronger the pulse signal, 25% approaching the saturation concentration of the NaCl solution.
When the water surface width is larger than 2m, a plurality of marker releasing points are arranged on the upstream measuring section, the distance between the marker releasing points is not larger than 1.5m, and the distance between the marker releasing points and the side wall is not larger than 1m, so that the markers can be captured by the marker detecting unit when the markers transversely shift.
The invention also provides a water body leakage measuring device, comprising:
the marker detection unit is used for measuring the cross section upstream and the cross section downstream, generating a pulse signal when capturing a marker in the water body and sending the generation time of the pulse signal to the processing unit;
the flow measuring unit is used for measuring the time-varying processes of the flow of the upstream measuring section and the downstream measuring section and sending the flow processes to the processing unit;
and the processing unit is used for obtaining the seepage/leakage of the water body flowing through the section between the upstream measuring section and the downstream measuring section according to the time between the two adjacent pulse signals of the upstream measuring section and the time between the two adjacent pulse signals of the downstream measuring section, the flow process of the upstream measuring section and the flow process of the downstream measuring section and the difference between the water body volume of the upstream measuring section and the water body volume of the downstream measuring section.
Preferably, in order to implement the solution of the present invention, the measuring apparatus further includes a dropping unit for dropping the marker into the flowing water body at the upstream measurement section twice; the time interval between the two shots is t, and the time interval t is less than the time for the water flow to migrate from the upstream port to the downstream port.
The marker detection unit comprises at least one first marker detection unit arranged on the upstream measuring section and at least one second marker detection unit arranged on the downstream measuring section, and two first pulse signals and two second pulse signals are generated when the identification objects are captured.
The flow measurement unit comprises at least one flow measurement unit arranged on an upstream measurement section and at least one flow measurement unit arranged on a downstream measurement section, and the flow measurement unit is used for measuring the change process of flow along with time.
The concrete implementation process of calculating the water volume of the upstream measurement section and the water volume of the downstream measurement section by the processing unit comprises the following steps: after the markers are put into the pipeline twice, two first pulse signals of an upstream measuring section and two second pulse signals of a downstream measuring section are recorded, and the volume of the water body flowing through the upstream measuring section of the pipeline in the time period between the two first pulse signals and the volume of the water body flowing through the downstream measuring section of the pipeline in the time period between the two second pulse signals are calculated.
As an inventive concept, the invention also provides a pipeline, wherein at least one marker detection unit and at least one flow measurement unit are respectively installed at an upstream port and a downstream port of the pipeline; the marker detection unit is used for generating pulses when capturing markers of the water body in the pipeline; the flow measuring unit is used for measuring the flow process in the pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1. the measuring method provided by the invention makes up the defects of the existing water body leakage quantity measuring method, and greatly improves the measuring precision;
2. the invention can accurately measure the water permeability, formulate the division standard of the damage degree of the pipeline defect, and provide reliable basis for analyzing and judging the pipeline defect and the water permeability/tightness of the defect;
3. the method is simple and easy to operate, low in cost, wide in application range and suitable for measuring the water leakage of the channels and the small and medium rivers.
Drawings
FIG. 1 is a schematic diagram of the measurement of the present invention.
FIG. 2 is a schematic view of the installation of a sensor in a pipeline in the practice of the present invention.
FIG. 3 is a time course diagram of the water flow conductivity measured by the upstream and downstream measurement section conductivity meters when the present invention is implemented.
FIG. 4 is a time course plot of the flow measured by the upstream and downstream measurement cross-section flow meter when the present invention is implemented.
Wherein: 1-a marker; w1-volume of upstream body of water, m3(ii) a W2-volume of downstream Water body after upstream Water body W1 has migrated, m3(ii) a Q1(t) -flow process line for upstream bodies of water, m3S; q2(t) -flow process line for downstream bodies of water, m3S; Δ t 1-the time difference, s, of the upstream and downstream boundaries of the water body passing through the upstream measurement section; Δ t 2-time difference, s, of the upstream and downstream boundaries of the water body passing through the downstream measurement section; Δ W-infiltration/leakage in the water body, m3(ii) a k-Water Permeability,%; 2-a marker detection unit; 3-a flow measurement unit; 4-a processing unit; 5-a throwing unit.
Detailed Description
The method comprises the following specific operation steps:
1) selecting a pipeline between adjacent inspection wells to be detected, and determining that no branch pipe is connected;
2) the upstream and downstream ports of the pipeline are respectively provided with a conductivity sensor and a flow sensor;
3) delivering an electrolyte solution to the shallow surface of the flowing water body twice at the upstream close to the upstream conductivity sensor, wherein the interval time between the two times is t, and the interval time t is less than the time for the water flow to migrate from the upstream port to the downstream port;
4) starting an upstream and downstream conductivity meter and a flowmeter while delivering an electrolyte solution, continuously and uninterruptedly collecting water flow conductivity data and flow data until two isolated conductivity pulses (the invention is an isolated pulse peak value with an index value exceeding a conductivity average value by 4-5 times of a root mean square value) appear on a downstream conductivity data curve, and stopping collection;
5) and extracting upstream conductivity data and flow data, drawing time process curves of the conductivity and the flow, and judging the occurrence moments t1 and t2 of two conductivity peak pulses from the conductivity process curves. Then, according to the flow process curve/function, calculating the water volume W1 passing through the upstream measurement section between the time t1 and the time t2, wherein the water volume calculation formula is as follows:
6) repeating the step 5), and calculating the water volume W2 passing through the downstream measurement section;
7) calculating Δ W as W2-W1, wherein when the value of Δ W is positive, the calculation indicates the amount of infiltration of underground and external water, and when the value of Δ W is negative, the calculation indicates the amount of leakage of water in the pipeline. Water permeability of pipe
Furthermore, the water depth of the pipeline is not less than 5cm, and the flow velocity is not more than 2 m/s.
Further, the electrolyte solution is delivered to the shallow surface layer of the flowing water body; and for the water surface with the width larger than 2m, carrying out multi-point delivery on the upstream measurement section, wherein the distance between marker delivery points is not more than 1.5m, and the distance from the side wall is not more than 1 m.
Further, the conductivity sensor is arranged on the shallow surface layer of the flowing water body; for the water surface with the width larger than 2m, a plurality of sets of conductivity meters are arranged on the downstream measuring section, so that the recognized objects can be accurately captured when the recognized objects are transversely deviated.
Furthermore, the flow meter adopts a cross-correlation flow meter or a Doppler flow meter, and the flow sensors are arranged at corresponding positions according to different requirements; and for the water surface with larger width, a plurality of sets of flow meters are respectively arranged on the upstream and downstream measuring sections.
Further, the electrolyte solution is a NaCl solution with a concentration of 25% by mass.
The invention creatively utilizes the high conductivity performance of the electrolyte solution and the complete following performance in the water body, applies the electrolyte solution as a marker to the identification of the flowing water body, and utilizes the conductivity meter as an identification device of the marker to identify the water body. The basic principle of measurement is (as shown in fig. 1): the electrolyte solution is delivered to a specific flowing water body twice, and the water body at the delivery position becomes a high-conductivity water body, so that the section of flowing water body has upstream and downstream boundaries and identifiability with high conductivity. When the electrolyte solution flows through the conductivity sensor, the conductivity meter generates two high conductivity peak pulses, and the water body between the two pulses is the specific water body. Identifying the upstream and downstream boundaries of the section of water body by using a conductivity meter on the upstream measurement section, synchronously measuring the flow process and the elapsed time, and calculating the volume of the water body; identifying the section of water body again on the downstream measuring section by the same method, and synchronously measuring the flow process and the elapsed time again to calculate the volume of the water body; the difference between the volumes of the two water bodies is the infiltration/leakage of the water body between the upstream and downstream measuring section areas. The ratio of the absolute value of the difference between the two water volumes to the upstream water volume is the water permeability of the pipeline, the water permeability reflects the water permeability of the pipeline, and the larger the water permeability is, the higher the damage degree of the pipeline defect is. According to the water permeability, a division standard of the defect damage degree of the pipeline is formulated.
Standard table for dividing damage degree of pipeline defect
Example 1
As shown in fig. 2 to 4:
1) the selected pipelines were: the distance between adjacent inspection wells is 30m, the diameter of the pipeline is 1.5m, no branch pipe is connected, and no obvious water drop or bubble swirl exists;
2) installing conductivity sensor and flow sensor respectively at the position 1.0m apart from pipeline upper and lower downstream port, wherein: the conductivity sensor is arranged on the shallow surface layer of the water flow, and the cross-correlation flow sensor is arranged at the bottom of the pipe;
3) delivering electrolyte solution (NaCl solution with the mass percent concentration of 25%) to the shallow surface layer of the water body twice at an upstream port of the pipeline, wherein the interval time between the two times is 5 s;
4) starting an upstream and downstream conductivity meter and a flowmeter while delivering an electrolyte solution, continuously and uninterruptedly acquiring water flow conductivity data and flow data until two isolated conductivity pulses appear on a downstream conductivity data curve, and stopping acquisition;
5) the upstream conductivity data and flow data were extracted, and the time course curves of conductivity and flow were plotted, from which it was determined that two conductivity peak pulses occurred at seconds 2 and 7, respectively (as shown in fig. 3). From the flow process curve (as shown in FIG. 4), the volume of water W1 passing through the upstream measurement section between seconds 2 and 7 was calculated to be 1.08m3；
6) And 5) repeating the step 5), extracting downstream conductivity data and flow data, drawing a time process curve of the conductivity and the flow, and judging that two conductivity peak pulses respectively appear at the 60 th second and the 64 th second from the conductivity process curve. From the flow process curve, the volume of water W2 passing through the downstream measurement section between the 60 th and 64 th seconds was calculated to be 0.84m3；
7) Calculating Δ W as W2-W1 as 0.24m3The water leakage rate k of the pipeline is 22.2 percent, which belongs to strong water permeability and four-stage damage, and needs emergency repair or renovation.
Example 2
As shown in fig. 2, an embodiment 2 of the present invention is a water body leakage amount measuring apparatus, including:
the marker detection unit 2 is used for measuring the cross section upstream and the cross section downstream, generating a pulse signal when the marker 1 is captured in the water body, and sending the generation time of the pulse signal to the processing unit;
the flow measuring unit 3 is used for measuring the flow processes of the upstream measuring section and the downstream measuring section and sending the flow processes to the processing unit;
and the processing unit 4 is configured to calculate a water volume of the upstream measurement cross section and a water volume of the downstream measurement cross section respectively according to the time between the pulse signals and a flow process (the flow process is a flow time-dependent change process), and obtain an infiltration amount/a leakage amount of the water flowing through a section between the upstream measurement cross section and the downstream measurement cross section according to a difference between the water volume of the upstream measurement cross section and the water volume of the downstream measurement cross section.
The processing unit of this embodiment also calculates the water permeability using the water volume of the upstream measurement section and the water volume of the downstream measurement section.
The marker 1 may be an electrolyte solution, and the marker detecting unit may be a conductivity sensor (conductivity meter).
The flow measurement unit (flow sensor) may be a cross-correlation flow meter or a doppler flow meter.
The processing unit may be a microprocessor. The microprocessor is connected with the conductivity meter and the flowmeter.
The embodiment 2 is also provided with a throwing unit 5 for throwing the marker into the flowing water body at the upstream measurement section twice; the time interval between the two shots is t, and the time interval t is less than the time for the water flow to migrate from the upstream port to the downstream port.
The marker detection unit comprises a first marker detection unit arranged on the upstream measuring section and a second marker detection unit arranged on the downstream measuring section; when the water surface width is large, a plurality of marker detection units can be respectively arranged on the upstream measurement section and the downstream measurement section.
The flow measuring unit comprises at least one flow measuring unit arranged on the upstream measuring section and at least one flow measuring unit arranged on the downstream measuring section; for the water surface with larger width, a plurality of sets of flow meters can be respectively arranged on the upstream and downstream measuring sections.
The specific implementation process of calculating the water volume of the upstream measurement section and the water volume of the downstream measurement section by the processing unit in this embodiment includes: after the markers are put into the pipeline twice, two first pulse signals of an upstream measuring section and two second pulse signals of a downstream measuring section are recorded, and the volume of the water body flowing through the upstream measuring section of the pipeline in the time period between the two first pulse signals and the volume of the water body flowing through the downstream measuring section of the pipeline in the time period between the two second pulse signals are calculated.
The embodiment 3 of the invention provides a pipeline, wherein a marker detection unit and a flow measurement unit are installed at an upstream port of the pipeline, and a marker detection unit and a flow measurement unit are installed at a downstream port of the pipeline; when the water surface is wide, a plurality of marker detection units can be respectively arranged on the upstream and downstream measurement cross sections. The marker detection unit is used for generating pulses when capturing the markers of the water body in the pipeline. The identifier may be an electrolyte solution. The water depth of the pipeline is not less than 5cm, and the flow velocity is not more than 2 m/s. Delivering the electrolyte solution to the shallow surface layer of the flowing water body; for water surfaces with larger widths, multi-point delivery is performed on the upstream measurement section. The marker detection unit can be a conductivity meter, and the conductivity sensor is arranged on the shallow surface layer of the flowing water body; for water surfaces with larger width, a plurality of sets of conductivity meters are arranged on the downstream measuring section. The flow measuring unit may be a flow meter. The flow meter adopts a cross-correlation flow meter or a Doppler flow meter, and the flow sensors are arranged at corresponding positions according to different requirements; and for the water surface with larger width, a plurality of sets of flow meters are respectively arranged on the upstream and downstream measuring sections.
Claims (10)
1. A method for measuring water body leakage quantity is characterized by comprising the following steps:
s1, identifying the water body by using a pulse signal generated when the marker is captured by the marker detection unit, and determining the volume of the water body flowing through the upstream measurement section and the volume of the water body flowing through the downstream measurement section;
and S2, calculating the difference between the water volume of the upstream measuring section and the water volume of the downstream measuring section to obtain the seepage/leakage of the water flowing through the section between the upstream measuring section and the downstream measuring section.
2. The water body leakage amount measuring method according to claim 1, wherein before the step S1, the following steps are further performed: putting the marker into a flowing water body with an upstream measuring section twice; the interval time of the two times of putting is t, and the interval time t is less than the time of the water flow transferring from the upstream measuring section to the downstream measuring section.
3. The method for measuring the leakage amount of the water body according to claim 1 or 2, wherein the step S1 is implemented by the following steps:
after the markers are put into the upstream measurement section twice, two first pulse signals generated when the markers pass through and captured by the marker detection unit at the upstream measurement section and two second pulse signals generated when the markers pass through and captured by the marker detection unit at the downstream measurement section are recorded, and the volume of the water body flowing through the upstream measurement section in the time period between the two first pulse signals and the volume of the water body flowing through the downstream measurement section in the time period between the two second pulse signals are calculated.
4. The water body leakage amount measuring method according to claim 1 or 2, further comprising, after the step S1: calculating the water permeability by using the water volume of the upstream measuring section and the water volume of the downstream measuring section; preferably, when the water body flows in the pipeline, the division standard of the defect damage degree of the pipeline is determined by using the water permeability; preferably, the division criteria include:
when the water permeability k is less than 5%, the pipeline is impervious;
when k is more than or equal to 5% and less than 10%, the pipeline is slightly permeable;
when k is more than or equal to 10% and less than 15%, the pipeline is weak and permeable;
when k is more than or equal to 15% and less than 20%, the pipeline is permeated with water;
when k is more than or equal to 20%, the pipeline is strong and permeable.
5. The water body leakage amount measuring method according to claim 1 or 2, wherein at least one marker detecting unit and at least one flow measuring unit are respectively installed at the upstream measuring section and the downstream measuring section.
6. The method of claim 1 or 2, wherein the identifier is an electrolyte solution; preferably, the electrolyte solution is a NaCl solution with a concentration of 25% by mass.
7. The water body leakage amount measuring method according to claim 2, wherein when the water surface width is larger than 2m, a plurality of marker throwing points are arranged on the upstream measuring section; preferably, the distance between the marker release points is not more than 1.5m, and the distance between the marker release points and the side wall is not more than 1 m.
8. A water leakage measuring device, comprising:
the marker detection unit is used for measuring the cross section upstream and the cross section downstream, generating a pulse signal when the marker captured in the water body passes through, and sending the generation time of the pulse signal to the processing unit;
the flow measuring unit is used for measuring the time-varying processes of the flow of the upstream measuring section and the downstream measuring section and sending the flow processes to the processing unit;
the processing unit is used for respectively calculating the water volume of the upstream measurement section and the water volume of the downstream measurement section according to the time between two adjacent pulse signals of the upstream measurement section and the time between two adjacent pulse signals of the downstream measurement section, as well as the flow process of the upstream measurement section and the flow process of the downstream measurement section, and obtaining the infiltration/leakage when the water flows through a section between the upstream measurement section and the downstream measurement section according to the difference between the water volume of the upstream measurement section and the water volume of the downstream measurement section; preferably, the processing unit calculates the water permeability by using the water volume of the upstream measurement section and the water volume of the downstream measurement section;
preferably, the system further comprises a throwing unit for throwing the marker into the flowing water body at the upstream measuring section twice; the time interval between the two shots is t, and the time interval t is less than the time for the water flow to migrate from the upstream port to the downstream port.
9. The water leakage measuring device according to claim 8, wherein the marker detecting unit comprises at least one first marker detecting unit arranged on an upstream measuring section and at least one second marker detecting unit arranged on a downstream measuring section; preferably, the specific implementation process of the processing unit calculating the water volume of the upstream measurement section and the water volume of the downstream measurement section includes: after the markers are put into the upstream measurement section twice, two first pulse signals generated when the markers pass through and captured by the marker detection unit at the upstream measurement section and two second pulse signals generated when the markers pass through and captured by the marker detection unit at the downstream measurement section are recorded, and the volume of the water body flowing through the upstream measurement section of the pipeline in the time period between the two first pulse signals and the volume of the water body flowing through the downstream measurement section of the pipeline in the time period between the two second pulse signals are calculated.
10. A pipeline is characterized in that at least one marker detection unit and at least one flow measurement unit are respectively arranged at an upstream port and a downstream port of the pipeline; the marker detection unit is used for generating pulses when a marker of the water body in the pipeline is detected, and the flow measurement unit is used for measuring the change process of the flow in the pipeline along with time.
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