Section flow real-time calculation system based on multifunctional navigation mark monitoring data

Abstract

The invention discloses a section flow real-time calculation system based on multifunctional navigation mark monitoring data. The method comprises the following steps: S1, sectioning a multifunctional navigation mark flow monitoring calculation target section; s2, dividing each calculation unit of a flow monitoring calculation target section and arranging a multifunctional navigation mark; s3, calculating the area of each unit where the multifunctional navigation mark is located under different water levels; s4, the representative flow velocity of each unit where the multifunctional navigation mark is located is calculated; and S5, calculating the total flow of the real-time monitoring section of the multifunctional navigation mark. According to the method, the real-time analysis and calculation of the section flow are realized by processing the real-time monitoring data of the multifunctional navigation mark in a mountainous river reach and an area influenced by the adjustment of the under-dam non-constant flow, the processing speed is high, manpower does not need to be input during measurement, and the measurement accuracy is high. The problem that a large amount of manpower and time resource investment is consumed in the current hydrological flow measurement process can be solved, and the work efficiency of section flow measurement and analysis calculation is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrological measurement and calculation in waterway engineering, and particularly to a real-time cross-section flow calculation system based on multi-functional beacon monitoring data. Background Art

[0002] The main method of current hydrological flow measurement is to mount an Acoustic Doppler Current Profiler (ADCP) on a ship. By the ship's navigation, the vertical stratified flow velocities of each sub-region are measured by moving, and the representative flow velocities of each sub-region are obtained. Through the topographic survey of the cross-section for flow measurement, the cross-sectional areas of each sub-region are obtained, and then the flow rates of each sub-region are calculated, and finally the sum is obtained to get the flow rate of the entire cross-section. However, the currently commonly used hydrological flow measurement method requires manual measurement of the flow velocity at each measuring point one by one, with a large workload, consuming a lot of manpower and time. Moreover, the water level and flow velocity at each measuring point are not the measured water level and flow velocity at the same moment, and the measurement errors of the water level and flow velocity will cause calculation errors in the water level flow rate. In addition, the currently used hydrological flow measurement method cannot obtain the information such as the water level and flow velocity of each cross-section calculation unit in real time, and cannot calculate the real-time change process of the cross-section flow rate in real time.

[0003] The multi-functional beacon is a new type of beacon that integrates and mounts devices such as an Acoustic Doppler Current Profiler (ADCP), an automatic water level gauge, and a turbidity meter on the existing waterway beacon. It not only has the function of the traditional beacon indicating the waterway, but also can monitor the data information such as the flow velocity and water level of the water area in real time and transmit it back to the multi-functional beacon data management system. Currently, in river sections lacking hydrological stations and relevant hydrological data, as well as in river sections with large time-average and daily-average amplitude changes of the incoming flow and fast cross-section flow rate changes, the flow rate change process has an important impact on the analysis of riverbed evolution and the change of waterway conditions. However, there is still a problem that the flow rate change process of the above river sections cannot be obtained in real time, and the existing methods cannot solve the above problems well. Deploying multi-functional beacons to obtain real-time monitoring data provides a new idea for solving the above problems, but currently, there is an urgent need to develop a new path to solve the above problems based on multi-functional beacon monitoring data. Summary of the Invention

[0004] In view of the above problems, a real-time cross-section flow calculation system based on multi-functional beacon monitoring data is provided, aiming to solve the problems existing in the prior art.

[0005] The specific technical solutions are as follows:

[0006] A real-time cross-section flow calculation system based on multi-functional beacon monitoring data includes the following steps:

[0007] S1. Extract the target cross-section for multi-functional beacon flow monitoring and calculation: Based on the topographic map of the river section where the multi-functional beacon monitoring and calculation cross-section is located.

[0008] S2. Divide each calculation unit of the target cross-section for flow monitoring and calculation and deploy multi-functional beacons: In mountainous river sections, arrange a cross-section calculation unit every 10 - 20 m of the river width; in plain river sections, arrange a cross-section calculation unit every 20 - 40 m of the river width. According to the arranged cross-section calculation units, deploy multi-functional beacons equipped with the vertical velocity measurement function of an Acoustic Doppler Current Profiler (ADCP) and water level gauges at the midpoint of the water surface of each cross-section calculation unit.

[0009] S3. Calculate the areas of each unit where the multi-functional beacons are located at different water levels: Based on the real-time water level monitoring data monitored by the multi-functional beacons, combined with the shape and elevation parameters of the target cross-section for flow monitoring and calculation obtained in S1, calculate the areas of each cross-section calculation unit arranged in S2 at the monitored water level.

[0010] S4. Calculate the representative velocities of each unit where the multi-functional beacons are located: From the vertical stratified velocities measured by the multi-functional beacons, use the vertical average velocity method to calculate the representative velocities of each arranged cross-section calculation unit.

[0011] S5. Calculate the total flow of the real-time monitoring cross-section of the multi-functional beacon: Based on the areas of each cross-section calculation unit at the monitored water level calculated in S3, combined with the representative velocities of each arranged cross-section calculation unit calculated in S4, use the velocity-area method to calculate the flow of each cross-section unit, and then add up the flows of each cross-section unit to obtain the total flow of the real-time monitoring cross-section of the multi-functional beacon.

[0012] The above real-time cross-section flow calculation system based on multi-functional beacon monitoring data also has the following characteristics. The specific implementation process of step S1 is as follows:

[0013] (1) Determine the target cross-section for multi-functional beacon flow monitoring and calculation;

[0014] (2) Collect the AutoCAD topographic elevation point map of the river section where the target flow monitoring cross-section is located;

[0015] (3) Use AutoCAD Civil 3D software to open the AutoCAD topographic elevation point map collected in (2), and generate a surface S from the topographic elevation points;

[0016] (4) Use AutoCAD Civil 3D to create a route l that includes the target flow monitoring cross-section. Create a sampling line group t with the route l as the object. After creating the sampling line group, set the sampling width d of the target flow monitoring cross-section to be not less than the actual river width d0;

[0017] (5) Use AutoCAD Civil 3D to select the route l and the sampling line group t - click to create a cross-sectional view. In the obtained view, select the target flow monitoring cross-sectional view p, which contains relevant charts and parameters such as cross-sectional shape and elevation.

[0018] The above real-time cross-sectional flow calculation system based on multi-functional beacon monitoring data also has the following characteristics. The specific implementation process of step S2 is as follows:

[0019] In the view p obtained by cutting in step S1, according to the water surface line during AutoCAD mapping of the basic terrain elevation points, from the left bank to the right bank, arrange a cross-sectional calculation unit every 10 - 20 m in the mountainous river section and every 20 - 40 m in the plain river section. A total of n cross-sectional calculation units are arranged, and each cross-sectional calculation unit is drawn on the view p.

[0020] The above real-time cross-sectional flow calculation system based on multi-functional beacon monitoring data also has the following characteristics. The specific implementation process of step S2 is as follows:

[0021] In the view p obtained by cutting in step S1, according to the water surface line during AutoCAD mapping of the basic terrain elevation points, from the left bank to the right bank, arrange a cross-sectional calculation unit every 10 - 20 m in the mountainous river section and every 20 - 40 m in the plain river section. A total of n cross-sectional calculation units are arranged, and each cross-sectional calculation unit is drawn on the view p;

[0022] According to each cross-sectional calculation unit arranged in step S2(1), a multi-functional beacon equipped with an acoustic Doppler current profiler (ADCP) and a water level gauge is correspondingly arranged at the midpoint of the water surface of each cross-sectional calculation unit.

[0023] The above real-time cross-sectional flow calculation system based on multi-functional beacon monitoring data also has the following characteristics. The specific implementation process of step S3 is as follows:

[0024] Mark the real-time water levels w1, w2, w3...wn of each cross-sectional calculation unit measured by the automatic water level gauge carried by each multi-functional beacon in the corresponding cross-sectional calculation unit in the view p, forming the marked cross-sectional calculation units u1, u2, u3...un;

[0025] In the AutoCAD Civil 3D software, form the independent boundaries of each cross-sectional calculation unit, and separately record the areas s1, s2, s3...sn of the marked cross-sectional calculation units u1, u2, u3...un.

[0026] The above real-time cross-sectional flow calculation system based on multi-functional navigation mark monitoring data also has the following characteristics. The specific implementation process of step S4 is as follows:

[0027] Set the acoustic Doppler current profiler (ADCP) carried by each multi-functional navigation mark to measure the vertical velocities at 0.2 times, 0.6 times, and 0.8 times the water depth at its location point. Corresponding to time t in S3, the vertical velocities of each cross-sectional calculation unit at time t are respectively recorded as (v1(0.2h), v1(0.6h), v1(0.8h)), (v2(0.2h), v2(0.6h), v2(0.8h)), (v3(0.2h), v3(0.6h), v3(0.8h))...(vn(0.2h), vn(0.6h), vn(0.8h));

[0028] Average the velocities measured at each water depth of each cross-sectional calculation unit, and record it as:

[0029] ....

[0031]

[0032] And take the calculated vertical average velocity As the representative velocity of each cross-sectional calculation unit.

[0033] The above real-time cross-sectional flow calculation system based on multi-functional navigation mark monitoring data also has the following characteristics. The specific implementation process of step S5 is as follows:

[0034] (1) From the areas s1, s2, s3...sn of each cross-sectional calculation unit at the real-time water level in step S3 and the vertical average velocities of each cross-sectional calculation unit calculated in step S4 Calculate the flow of each cross-sectional calculation unit:

[0035] ....

[0037]

[0038] q1, q2, q3...qn are the flows of each cross-sectional calculation unit;

[0039] (2) Sum the flows of each cross-sectional calculation unit to obtain the total flow of the flow monitoring calculation target cross-section:

[0040]

[0041] Q is the total flow rate of the target cross-section for flow monitoring and calculation.

[0042] In summary, the beneficial effects of this solution are as follows:

[0043] Through the processing of real-time monitoring data of multi-functional navigation aids, the present invention realizes the real-time analysis and calculation of cross-section flow rate. The processing speed is fast, and no human resources are required during measurement, which can solve the problem of consuming a large amount of human and time resources in the current hydrological flow measurement process, and greatly improve the work efficiency of cross-section flow measurement and analysis and calculation.

[0044] The present invention solves the problem that in the existing cross-section flow measurement method, due to the need to measure the vertical velocity of each vertical line one by one, the water level and velocity measured in each measurement sub-region are not the water level and velocity at the same moment, resulting in errors in the total cross-section flow rate obtained by analysis and calculation. By monitoring and analyzing the water level and velocity at the same moment in each sub-region, the measurement accuracy of cross-section flow rate is significantly improved.

[0093] The present invention has a wide range of applications. It is not only applicable to river sections with relatively rich hydrological data, but also applicable to river sections lacking hydrological stations and relevant hydrological data, as well as river sections with large time-average and daily-average variations in incoming flow and rapid changes in cross-section flow rate. The change process of flow rate can be analyzed through monitoring data, providing data support for the analysis of riverbed evolution and changes in waterway conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Figure 1 It is a schematic flow chart of the cross-section flow rate real-time calculation system based on multi-functional navigation aid monitoring data of the present invention;

[0095] Figure 2 It is a specific location map of the target cross-section for flow monitoring and calculation in an embodiment of the present invention;

[0096] Figure 3 It is a cross-sectional view of the target cross-section for flow monitoring and calculation in an embodiment of the present invention;

[0097] Figure 4 It is a layout diagram of multi-functional navigation aids and division of each cross-section calculation unit in an embodiment of the present invention;

[0098] Figure 5 It is a flow rate calculation process diagram of each cross-section calculation unit of the target cross-section for flow monitoring and calculation in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0099] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0100] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0101] The present invention will be further described below in conjunction with specific embodiments, but it is not a limitation of the present invention.

[0102] Figure 1 It is a schematic flow chart of the cross-section flow real-time calculation system based on the multi-functional beacon monitoring data of the present invention. Figure 2 It is a specific location map of the target cross-section for flow monitoring and calculation in the embodiment of the present invention. Figure 3 It is a cross-sectional view of the target cross-section for flow monitoring and calculation in the embodiment of the present invention. Figure 4 It is a layout diagram of multi-functional beacons and a division diagram of each cross-section calculation unit in the embodiment of the present invention. Figure 5 It is a flow chart of the flow calculation of each cross-section calculation unit of the target cross-section for flow monitoring and calculation in the embodiment of the present invention. As Figures 1-5 shown, the cross-section flow real-time calculation system based on the multi-functional beacon monitoring data provided in this embodiment includes the following steps:

[0103] S1. Cut the target cross-section for flow monitoring and calculation of the multi-functional beacon: According to the topographic map of the river section where the cross-section for flow monitoring and calculation of the multi-functional beacon is located, use AutoCAD Civil 3D software to cut and obtain parameters such as the shape and elevation of the target cross-section for flow monitoring and calculation.

[0104] The specific implementation process of step S1 is as follows:

[0105] (1) Determine the target cross-section for flow monitoring and calculation of the multi-functional beacon.

[0106] (2) Collect the AutoCAD topographic map of the basic terrain elevation points of the river section where the target cross-section for flow monitoring is located.

[0107] (3) Open the AutoCAD topographic map of the basic terrain elevation points collected in (2) with AutoCAD Civil 3D software. In the tool space, select "Surface" - "Create Surface" - "Graphic Object" - "Add" - "Object Type" - "Text" - select all terrain elevation points, and generate the terrain elevation points into surface S.

[0108] (4) In the AutoCAD Civil 3D main toolbar, select "Common" - "Route" - "Create Route from Objects" to create a route l that includes the target flow monitoring section. Select "Sampling Line" in the main toolbar and create a sampling line group t with route l as the object. After creating the sampling line group, select the "Sampling Line Tool" to set the sampling width d of the target flow monitoring section to be not less than the actual width d0 of the river.

[0109] (5) In the AutoCAD Civil 3D main toolbar, select "Cross Section" - "Create Multiple Views" - select route l and sampling line group t - click to create a cross-sectional view. In the obtained view, select the target flow monitoring section view p, and view p includes relevant charts and parameters such as section morphology and elevation.

[0110] In the above embodiment, S2: Divide each calculation unit of the flow monitoring calculation target section and deploy multi-functional navigation aids: According to the requirements of the "River Flow Measurement Specification" GB 50179-2015, in mountainous river sections, arrange a section calculation unit every 10 - 20 m of river width, and in plain river sections, arrange a section calculation unit every 20 - 40 m of river width. According to the arranged section calculation units, deploy multi-functional navigation aids equipped with the vertical velocity measurement function of an acoustic Doppler current profiler (ADCP) and a water level gauge at the midpoint of the water surface of each section calculation unit;

[0111] The specific implementation process of step S2 is as follows:

[0112] (1) In the view p obtained in step S1, according to the water surface line during AutoCAD mapping of the basic terrain elevation points, from the left bank to the right bank, arrange a section calculation unit every 10 - 20 m of river width in mountainous river sections, and arrange a section calculation unit every 20 - 40 m of river width in plain river sections. A total of n section calculation units are arranged, and each section calculation unit is drawn on view p.

[0113] (2) According to each section calculation unit arranged in step S2(1), deploy a multi-functional navigation aid equipped with an acoustic Doppler current profiler (ADCP) and a water level gauge at the midpoint of the water surface of each section calculation unit.

[0114] In the above embodiment, S3: Calculate the areas of each unit where the multi-functional navigation aids are located at different water levels: According to the real-time water level monitoring data monitored by the multi-functional navigation aids, combined with the morphology and elevation parameters of the flow monitoring calculation target section obtained in S1, use AutoCAD Civil 3D software to calculate the areas of each section calculation unit arranged in S2 at the monitored water level;

[0115] The specific implementation process of step S3 is as follows:

[0116] (1) The real-time water levels w1, w2, w3...wn of each cross-section calculation unit at a certain moment t measured by the automatic water level gauge carried by each multi-functional navigation buoy are respectively marked in each corresponding cross-section calculation unit in view p, forming the marked cross-section calculation units u1, u2, u3...un.

[0117] (2) In the AutoCAD Civil 3D software, enter the "boundary" command in the command bar, click on the marked cross-section calculation units u1, u2, u3...un respectively to form the independent boundaries of each cross-section calculation unit, and select "Properties" to record the areas s1, s2, s3...sn of the marked cross-section calculation units u1, u2, u3...un respectively.

[0118] In the above embodiment, S4. Calculate the representative flow velocity of each unit where the multi-functional navigation buoy is located: For the vertical stratified flow velocity measured by the multi-functional navigation buoy, the representative flow velocity of each layout cross-section calculation unit is calculated by the vertical average flow velocity method;

[0119] The specific implementation process of step S4 is as follows:

[0120] (1) Set the acoustic Doppler current profiler (ADCP) carried by each multi-functional navigation buoy to measure the vertical flow velocities at 0.2 times, 0.6 times, and 0.8 times the water depth at its location point, corresponding to the moment t in S3. The vertical flow velocities of each cross-section calculation unit at the moment t are respectively recorded as (v1(0.2h), v1(0.6h), v1(0.8h)), (v2(0.2h), v2(0.6h), v2(0.8h)), (v3(0.2h), v3(0.6h), v3(0.8h))...(vn(0.2h), vn(0.6h), vn(0.8h)).

[0121] (2) Average the flow velocities measured at each water depth of each cross-section calculation unit, and record it as:

[0122] ....

[0124]

[0125] And take the calculated vertical average flow velocity as the representative flow velocity of each cross-section calculation unit.

[0126] In the above embodiments, S5. Calculate the total flow of the real-time monitoring section of the multi-functional navigation mark: According to the areas of each cross-section calculation unit obtained in S3 at the monitoring water level, combined with the representative flow velocities of each cross-section calculation unit calculated in S4, use the velocity-area method to calculate the flow of each cross-section unit, and then add up the flows of each cross-section unit to obtain the total flow of the real-time monitoring section of the multi-functional navigation mark;

[0127] The specific implementation process of step S5 is as follows:

[0128] (1) From the areas s1, s2, s3...sn of each cross-section calculation unit at the real-time water level in step S3 and the vertical average flow velocities of each cross-section calculation unit calculated in step S4 Calculate the flow of each cross-section calculation unit:

[0129] ....

[0131]

[0132] q1, q2, q3...qn are the flows of each cross-section calculation unit.

[0133] (2) Sum up the flows of each cross-section calculation unit to obtain the total flow of the flow monitoring calculation target cross-section:

[0134]

[0135] Q is the total flow of the flow monitoring calculation target cross-section.

[0136] It should be noted that taking the real-time calculation of the flow of the monitoring section of Lujiahe Waterway in the middle reaches of the Yangtze River as an example for detailed description:

[0137] S1. Cut the target cross-section for the flow monitoring calculation of the multi-functional navigation mark.

[0138] Lujiahe Waterway is located 72 km downstream of the Three Gorges Reservoir. Affected by the non-steady flow regulation of the Three Gorges Reservoir, the daily and diurnal variations of the flow are relatively obvious. It is in the transitional zone from mountainous rivers to plain rivers, and the variation processes of water level, flow, etc. are relatively complex here. Therefore, the inlet cross-section of Lujiahe Waterway (mileage 555.1 km in the middle reaches of the waterway) is determined as the target cross-section for the flow monitoring calculation of the multi-functional navigation mark.

[0139] Collect the AutoCAD mapping of the basic topographic elevation points of the river section where the inlet cross-section of Lujiahe Waterway is located in March 2024.

[0140] Open the AutoCAD topographic elevation point survey map in February 2024 collected in (2) using AutoCAD Civil 3D software. In the toolspace, select "Surface" - "Create Surface" - "Graphic Object" - "Add" - "Object Type" - "Text" - select all topographic elevation points to generate a surface S.

[0141] In the AutoCAD Civil 3D main toolbar, select "Common" - "Route" - "Create Route from Objects" to create a route l that includes the inlet cross-section of the Lujiahe Waterway as shown in Figure 2 Select "Sampling Line" in the main toolbar to create a sampling line group t with route l as the object. After creating the sampling line group, select "Sampling Line Tool" to set the sampling width d = 950 m (not less than the actual river width d0 = 910 m) of the target flow monitoring cross-section.

[0142] In the AutoCAD Civil 3D main toolbar, select "Cross Section" - "Create Multiple Views" - select route l and sampling line group t - click to create a cross-sectional view. The obtained cross-sectional view is as shown in Figure 3 Select cross-section #3, i.e., the inlet cross-section view p of the Lujiahe Waterway. View p contains relevant charts and parameters such as the shape and elevation of the inlet cross-section of the Lujiahe Waterway.

[0143] S2. Divide each calculation unit of the flow monitoring calculation target cross-section and deploy multifunctional navigation aids.

[0144] (1) In the view p obtained in step S1, according to the water line during the AutoCAD mapping of the basic topographic elevation points, since this river section is in the transitional zone from mountainous rivers to plain rivers, starting from the left bank to the right bank, a cross-section calculation unit is arranged every 40 m in river width, and a total of 23 cross-section calculation units are arranged and plotted on view p as shown in Figure 4 as shown.

[0145] (2) According to each cross-section calculation unit arranged in step S2(1), deploy a multifunctional navigation aid with an acoustic Doppler current profiler and a water level gauge at the midpoint of the water surface of each cross-section calculation unit.

[0146] S3. Calculate the areas of each unit where the multifunctional navigation aids are located at different water levels.

[0147] (1) Mark the real-time water levels of each cross-section calculation unit at the inlet section of the Lujiahe Waterway measured by the automatic water level gauge carried by each multi-functional navigation buoy at 8:05:00 am on March 3, 2024, w1 = 35.28m, w2 = 35.32m, w3 = 35.31m... w23 = 35.33m, respectively, in the corresponding cross-section calculation unit in view p, to form the marked cross-section calculation units u1, u2, u3... u23.

[0148] (2) In the AutoCAD Civil 3D software, enter the "boundary" command in the command bar, click on each cross-section calculation unit u1, u2, u3... u23 at the inlet section of the Lujiahe Waterway after marking respectively, to form the independent boundaries of each cross-section calculation unit at the inlet section of the Lujiahe Waterway, and select "Properties" to record the areas of the marked cross-section calculation units u1, u2, u3... u23 respectively, s1 = 123.86m2, s2 = 326.11m2, s3 = 483.32m2... s23 = 175.63m2.

[0149] S4. Calculate the representative flow velocities of each unit where the multi-functional navigation buoy is located.

[0150] (1) Set the acoustic Doppler current profiler (ADCP) carried by each multi-functional navigation buoy to measure the vertical current velocities at 0.2 times, 0.6 times, and 0.8 times the water depth at its location. The vertical current velocities of each cross-section calculation unit at the inlet section of the Lujiahe Waterway at 8:05:00 am on March 3, 2024, are respectively recorded as (v1(0.2h) = 0.51m / s, v1(0.6h) = 0.42m / s, v1(0.8h) = 0.31m / s), (v2(0.2h) = 0.52m / s, v2(0.6h) = 0.43m / s, v2(0.8h) = 0.29m / s), (v3(0.2h) = 0.53m / s), v3(0.6h) = 0.4m / s, v3(0.8h) = 0.31m / s)... (v23(0.2h) = 0.62m / s, v23(0.6h) = 0.54m / s, v23(0.8h) = 0.44m / s).

[0151] (2) Average the flow velocities measured at each water depth of each cross-section calculation unit at the inlet section of the Lujiahe Waterway to obtain:

[0152] ....

[0154]

[0155] Vertical average flow velocity That is the representative velocity of each cross-section calculation unit at the inlet cross-section of the Lujiahe Waterway.

[0156] S5. Calculate the total flow of the real-time monitoring cross-section of the multi-functional navigation mark.

[0157] (1) From the areas s1, s2, s3... s23 of each cross-section calculation unit at the inlet cross-section of the Lujiahe Waterway at the real-time water level in step S3 and the vertical average velocity of each cross-section calculation unit at the inlet cross-section of the Lujiahe Waterway calculated in step S4 Calculate the flow of each cross-section calculation unit:

[0158] ....

[0160]

[0161] q1, q2, q3... q23 are the flows of each cross-section calculation unit at the inlet cross-section of the Lujiahe Waterway.

[0162] (2) Sum up the flows of each cross-section calculation unit at the inlet cross-section of the Lujiahe Waterway to obtain the total flow of the flow monitoring calculation target cross-section, that is, the inlet cross-section of the Lujiahe Waterway:

[0163]

[0164] Q is the total flow of the inlet cross-section of the Lujiahe Waterway at 8:05:00 am on March 3, 2024. The intermediate calculation process is as Figure 5 shown.

[0165] Working principle: By analyzing and calculating the monitoring data of the multi-functional navigation mark, the cross-section flow can be quickly obtained, which can improve the problem of consuming a large amount of human and time resources in the hydrological flow measurement process of the existing method, greatly improving the work efficiency of cross-section flow measurement and analysis and calculation. At the same time, this method can also improve the problem that in the existing cross-section flow measurement method, due to the need to measure the vertical velocity one by one, the water level and velocity measured in each measurement sub-region are not the water level and velocity at the same moment, resulting in errors in the total cross-section flow obtained by analysis and calculation, significantly improving the accuracy of measurement data and the accuracy of cross-section flow analysis and calculation. In addition, this cross-section flow analysis and calculation method has a wide range of applications, solving the problem that the cross-section flow process cannot be obtained in real time in the river sections lacking hydrological stations and relevant hydrological data, as well as in the river sections with large time-average and daily-average variable amplitudes of the incoming flow and fast cross-section flow changes. The principle of the present invention is clear, the method steps are simple, the analysis and calculation efficiency and accuracy are high, and a complete real-time calculation system of cross-section flow based on the monitoring data of multi-functional navigation marks is formed.

[0166] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the solutions obtained by equivalent substitution and obvious changes made by using the content of the specification of the present invention should be included within the protection scope of the present invention.

Claims

1. A real-time calculation system for cross-sectional flow based on multifunctional navigation mark monitoring data, characterized in that: The following steps are involved: S1. Extract the target section for multifunctional navigation mark flow monitoring and calculation: survey the topography of the river section where the multifunctional navigation mark monitoring and calculation section is located; S2. Divide the target section of flow monitoring calculation into calculation units and arrange multifunctional navigation marks: arrange one section calculation unit for every 10-20m of river width in mountainous river sections, and arrange one section calculation unit for every 20-40m of river width in plain river sections. According to the arranged section calculation units, arrange multifunctional navigation marks equipped with Acoustic Doppler Current Profiler ADCP (Acoustic Doppler Current Profiler) vertical flow velocity measurement function and water level meter at the midpoint of the water surface of each section calculation unit; S3, calculate the area of ​​each unit where the multifunctional navigation mark is located under different water levels: according to the real-time water level monitoring data monitored by the multifunctional navigation mark, combined with the shape and elevation parameters of the target section calculated by the flow monitoring obtained in S1, calculate the area of ​​each section calculation unit arranged in S2 under the monitored water level; S4. Calculate the representative flow velocity of each unit where the multifunctional navigation mark is located: the vertical layered flow velocity measured by the multifunctional navigation mark is used to calculate the representative flow velocity of each layout section calculation unit by using the vertical average flow velocity method; S5. Calculate the total flow of the real-time monitoring section of the multifunctional navigation mark: Based on the area of ​​each cross-sectional calculation unit under the monitoring water level calculated in S3, combined with the representative flow velocity of each arranged cross-sectional calculation unit calculated in S4, the flow rate of each cross-sectional unit is calculated using the velocity-area method, and then the flow rates of each cross-sectional unit are added together to obtain the total flow of the real-time monitoring section of the multifunctional navigation mark.

2. A real-time calculation system for cross-sectional flow based on multifunctional navigation mark monitoring data according to claim 1, characterized in that: The specific implementation process of step S1 is as follows: (1) Determine the target section for multi-functional navigation mark flow monitoring calculation; (2) Collect AutoCAD mapping of basic terrain elevation points of the river section where the target flow monitoring section is located; (3) Using AutoCAD Civil 3D software to open the AutoCAD mapping of the basic terrain elevation points collected in (2), the terrain elevation points are generated into a surface S; (4) Using AutoCAD Civil 3D, create a route l including the target flow monitoring section, create a sampling line group t based on the route l, and after the sampling line group is created, set the sampling width d of the target flow monitoring section to be no less than the actual width d0 of the river; (5) Use AutoCAD Civil 3D to select route l and sampling line group t—click to create a cross-sectional view. In the resulting view, select the target flow monitoring section view p. View p contains relevant charts and parameters such as section shape and elevation.

3. A real-time calculation system for cross-sectional flow based on multifunctional navigation mark monitoring data according to claim 2, characterized in that: The specific implementation process of step S2 is as follows: In the view p obtained in step S1, according to the water surface line when mapping the basic terrain elevation point by AutoCAD, from the left bank to the right bank, a cross-section calculation unit is arranged every 10-20m of the river width in the mountainous river section, and a cross-section calculation unit is arranged every 20-40m of the river width in the plain river section, a total of n cross-section calculation units are arranged, and each cross-section calculation unit is drawn on the view p; According to the cross-sectional calculation units arranged in step S2 (1), a multifunctional navigation mark with an acoustic Doppler current profiler ADCP (Acoustic Doppler Current Profiler) and a water level meter is arranged at the midpoint of the water surface of each cross-sectional calculation unit.

4. A real-time calculation system for cross-sectional flow based on multifunctional navigation mark monitoring data according to claim 3, characterized in that: The specific implementation process of step S3 is as follows: The real-time water levels w1, w2, w3...wn of each cross-sectional calculation unit measured by the automatic water level gauge carried by each multifunctional navigation mark are respectively marked in each corresponding cross-sectional calculation unit in the view p to form marked cross-sectional calculation units u1, u2, u3...un; In AutoCAD Civil 3D software, an independent boundary of each cross-sectional calculation unit is formed, and the areas s1, s2, s3...sn of each marked cross-sectional calculation unit u1, u2, u3...un are recorded respectively.

5. A real-time calculation system for cross-sectional flow based on multifunctional navigation mark monitoring data according to claim 4, characterized in that: The specific implementation process of step S4 is as follows: Set the acoustic Doppler current profiler ADCP (Acoustic Doppler Current Profiler) carried by each multifunctional navigation beacon to measure the vertical velocity at 0.2 times, 0.6 times, and 0.8 times the water depth of its location, corresponding to the time t in S3, the vertical velocity of each cross-section calculation unit at time t is recorded as (v1(0.2h), v1(0.6h), v1(0.8h)), (v2(0.2h), v2(0.6h), v2(0.8h)), (v3(0.2h), v3(0.6h), v3(0.8h))...(vn(0.2h), vn(0.6h), vn(0.8h)); The velocity measured at each water depth in each cross-section calculation unit is averaged and recorded as: The calculated vertical average velocity As the representative flow velocity of each cross-sectional calculation unit.

6. A real-time calculation system for cross-sectional flow based on multifunctional navigation mark monitoring data according to claim 5, characterized in that: The specific implementation process of step S5 is as follows: (1) The vertical average flow velocity of each cross-sectional calculation unit calculated in step S4 is obtained by calculating the area s1, s2, s3...sn of each cross-sectional calculation unit under the real-time water level in step S3 and the vertical average flow velocity of each cross-sectional calculation unit calculated in step S4. Calculate the flow rate of each cross-section calculation unit: q1, q2, q3...qn are the flow rates of the calculation units in each section; (2) Sum the flow rates of the calculation units in each section to obtain the total flow rate of the target section for flow monitoring calculation: Q is the total flow rate of the target section calculated by flow monitoring.

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