A measuring device for a shallow water environment
By combining laser rangefinders and ultrasonic rangefinders in shallow water environments, the problem of water depth measurement in shallow water environments has been solved, achieving efficient and accurate water depth measurement without damaging the riverbed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DADU RIVER HYDROPOWER DEV
- Filing Date
- 2025-05-19
- Publication Date
- 2026-05-29
AI Technical Summary
In shallow water environments, ultrasonic rangefinders are insufficient to meet measurement requirements, and steel ruler measurements can damage the riverbed and have low accuracy.
A laser rangefinder is used to measure water depth data, and the water depth data is calibrated by using the speed of light in water. Combined with an ultrasonic rangefinder to measure the water surface height, water depth measurement can be achieved without contacting the riverbed.
It improves the accuracy and efficiency of hydrological measurements in shallow water environments, avoids damage to the riverbed, and reduces the workload of measurements.
Smart Images
Figure CN224303038U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydrological measurement technology, and in particular to a measuring device for shallow water environments. Background Technology
[0002] To measure hydrological data about a riverbed, the water depth is often measured. In deep-water environments, an ultrasonic rangefinder is typically extended underwater to obtain the riverbed depth data.
[0003] However, in some shallow water environments, the water depth is too shallow to submerge the ultrasonic probe below the surface. Alternatively, the distance between the underwater ultrasonic probe and the riverbed surface may be too small, failing to meet the measurement requirements of an ultrasonic rangefinder (generally requiring a distance greater than 5-10 cm).
[0004] Currently, water depth measurements in shallow water environments still largely rely on steel tape measurements. These measurements require direct contact with the riverbed, which can easily damage the terrain, result in low accuracy, and involve a large workload. Utility Model Content
[0005] This invention provides a hydrological measurement method and device for shallow water environments, which solves the problem of difficulty in measuring water depth in shallow water environments and improves the efficiency of hydrological measurement in shallow water environments.
[0006] In a first aspect, this utility model provides a hydrological measurement method for shallow water environments, comprising:
[0007] The propagation speed ratio of light in the shallow water environment to be tested is obtained, wherein the propagation speed ratio is the ratio of the speed of light in the water to the speed of light in the air.
[0008] The first water depth data of the area to be measured is obtained by the laser rangefinder of the water depth measurement component, wherein the laser rangefinder is located above the water surface;
[0009] The second water depth data is obtained by calibrating the first water depth data using the propagation speed ratio.
[0010] In one embodiment, obtaining the propagation speed ratio of light in the shallow water environment to be tested includes the following steps:
[0011] The laser-measured water depth Y in the calibration area at multiple calibration points is measured using a water depth measurement component, wherein the water quality environment of the calibration area is the same as that of the shallow water environment to be measured.
[0012] Obtain the actual water depth X at multiple corresponding calibration points;
[0013] Based on the laser-measured water depth Y at multiple calibration points and the corresponding actual water depth X, a linear regression function Y = a*X + b is obtained, where the slope a in the linear regression function is the propagation speed ratio.
[0014] In one embodiment, obtaining the actual water depth X of multiple corresponding calibration points includes the following steps:
[0015] The water in the calibration area is drained, and the actual depth of the corresponding calibration point is measured using a water depth measuring device.
[0016] The actual water depth X of the calibration point before drainage is obtained based on the actual depth of the calibration point after drainage and the water surface height before drainage.
[0017] In one implementation, the second water depth data is obtained by calibration using the following formula:
[0018] H2 = H1 / a, where H1 is the first water depth data, a is the propagation speed ratio, and H2 is the second water depth data.
[0019] In one embodiment, the water depth measurement assembly further includes an ultrasonic rangefinder located above the river surface;
[0020] The process of obtaining the first water depth data of the area to be measured based on the laser rangefinder of the water depth measurement component includes the following steps:
[0021] The first elevation was measured by using a laser rangefinder above the water surface to emit a laser beam into the riverbed of the area to be measured.
[0022] The second elevation was measured by using an ultrasonic rangefinder above the water surface to emit ultrasonic waves into the river surface of the area to be measured.
[0023] The elevation difference between the laser rangefinder and the ultrasonic rangefinder is obtained, and the first water depth data is obtained based on the elevation difference, the first elevation, and the second elevation.
[0024] In one implementation, the following steps are also included:
[0025] The water depth measuring component is moved along the riverbed cross-section to obtain second water depth data at multiple measuring points on the riverbed cross-section;
[0026] The topographic model of the riverbed cross section is obtained by combining the horizontal positions of multiple measurement points and the second water depth data of each measurement point.
[0027] Secondly, this application also provides a measuring device, which includes:
[0028] A measurement platform is set above the riverbed, and the measurement platform is located above the water surface;
[0029] The main body is positioned above the measuring platform;
[0030] A water depth measurement assembly, installed on the main body, includes a laser rangefinder and an ultrasonic rangefinder. Both the laser rangefinder and the ultrasonic rangefinder measure vertically and are located above the water surface. The laser rangefinder emits a measuring laser towards the riverbed to obtain a first elevation, and the ultrasonic rangefinder emits ultrasonic waves towards the river surface to obtain a second elevation.
[0031] A controller, which is connected to the water depth measurement component.
[0032] In one embodiment, a reflective vertical plate is also included;
[0033] The main body is also equipped with a horizontal rangefinder connected to the controller. The horizontal rangefinder is used to emit a measurement signal toward the reflective vertical plate to measure the horizontal distance between the main body and the reflective vertical plate.
[0034] In one embodiment, the measuring platform extends along the riverbed cross-section, and the reflective vertical plate is disposed on one side of the measuring platform along the direction of extension of the riverbed cross-section;
[0035] The main body is also equipped with rollers, and the controller is connected to the rollers so that the main body can move along the extension direction of the riverbed cross section.
[0036] In one embodiment, the measurement directions of the laser rangefinder and the ultrasonic rangefinder are both vertical, and the measurement direction of the horizontal rangefinder is horizontal.
[0037] In one embodiment, the main body is provided with a vertically extending slide rail, and the ultrasonic rangefinder is slidably mounted on the slide rail.
[0038] In one embodiment, a marking ruler is mounted on the slide rail, the scale lines of the marking ruler are arranged along the extension direction of the slide rail, and the zero mark of the marking ruler is at the same height as the probe of the laser rangefinder.
[0039] In one embodiment, the marking ruler is slidably mounted on the slide rail, and an indicator plate that slides horizontally is mounted at the zero mark of the marking ruler. The indicator plate can slide to below the laser rangefinder.
[0040] In one embodiment, the slide rail has a groove for mounting the ultrasonic rangefinder, and the slide rail is provided with a threaded hole communicating with the groove. A locking screw is threaded into the threaded hole. The locking screw is used to abut against the mounting base of the ultrasonic rangefinder and to press the mounting base into the groove, thereby locking the ultrasonic rangefinder.
[0041] In one embodiment, the ultrasonic rangefinder is detachably slidably mounted on the slide rail.
[0042] Compared with the prior art, the advantages of this utility model are that it uses a water depth measurement component with a laser rangefinder to measure the position of the riverbed, and can measure the water surface height using an ultrasonic rangefinder. By using the riverbed depth and water surface height, the water depth can be measured without inserting the ultrasonic rangefinder underwater, and it does not need to directly contact the riverbed. The measurement process does not change the environment of the shallow riverbed, and the measurement is relatively easy. Attached Figure Description
[0043] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.
[0044] Figure 1 This is a flowchart of the hydrological measurement method in an embodiment of this utility model;
[0045] Figure 2 This is a schematic diagram of the measuring device in use in an embodiment of this utility model;
[0046] Figure 3 This is a three-dimensional structural schematic diagram of the measuring device in an embodiment of this utility model;
[0047] Figure 4 This is a schematic diagram of the main structure of the measuring device in an embodiment of this utility model;
[0048] Figure 5 This is a front view schematic diagram of the measuring device in an embodiment of the present invention when adjusting the position of the marker ruler;
[0049] Figure 6 It is a scatter plot drawn from measurement data at multiple calibration points;
[0050] Figure 7 It is a model diagram of the riverbed cross section drawn using the hydrological measurement method of this application.
[0051] Figure label:
[0052] 1. Main body; 11. Slide rail; 12. Marker; 13. Roller; 14. Locking screw; 15. Indicator plate;
[0053] 2. Laser rangefinder;
[0054] 3. Ultrasonic rangefinder;
[0055] 4. Controller;
[0056] 5. Reflector vertical plate;
[0057] 6. Measurement platform;
[0058] 7. Horizontal distance measuring instrument. Detailed Implementation
[0059] The present invention will be further described below with reference to the accompanying drawings.
[0060] In river engineering model tests, it is often necessary to measure the impact of different fluid environments on the river channel of the model, thereby simulating the flow structure, riverbed evolution process, and engineering effects of natural rivers under specific conditions. By measuring the riverbed information of the river engineering model under different conditions, the actual evolution of the river channel under natural conditions can be reflected.
[0061] However, river engineering models are scaled-down replicas of natural rivers, and the channels are relatively shallow. This makes it difficult to insert ultrasonic probes below the water surface. Consequently, each depth measurement requires a steel ruler to be used against the bottom of the river engineering model. This process inevitably alters the riverbed surface, causing damage and interfering with subsequent experiments.
[0062] In other words, traditional topographic surveying methods are ill-suited for hydrological surveys in shallow water environments, such as river engineering models.
[0063] See Figures 1 to 3 As shown, in order to address the difficulties of hydrological measurement in shallow water environments, this application provides a hydrological measurement method for shallow water topography, which includes the following steps:
[0064] S100: Obtain the propagation speed ratio of light in the shallow water environment to be tested. The propagation speed ratio is the ratio of the speed of light in the water to the speed of light in the air.
[0065] S200: The first water depth data of the area to be measured is obtained by the laser rangefinder 2 of the water depth measurement component, with the laser rangefinder 2 located above the water surface;
[0066] S300: The second water depth data is obtained by calibrating the first water depth data using the propagation velocity ratio.
[0067] In this application, a laser rangefinder 2 positioned above the water surface is used to measure the water depth of the area to be measured, thereby obtaining the first water depth data. Compared to an ultrasonic measuring instrument, the laser rangefinder 2 can emit a laser beam above the water surface toward the riverbed, and the distance between the laser rangefinder 2 and the riverbed surface, i.e., the first water depth data, is obtained based on the laser signal reflected from the riverbed.
[0068] Because this application also calibrates the first water depth data to obtain the second water depth data by using the light propagation speed ratio in the shallow water environment under test, it avoids large deviations in measurement conclusions caused by differences in the speed of light propagation in different media. It also eliminates measurement errors caused by differences in the speed of light under different turbidity water conditions, thus improving the measurement accuracy of the laser rangefinder 2 in water depth measurement.
[0069] A laser rangefinder is an instrument that measures the distance to a target by modulating a laser beam with a specific parameter. The measurement range of a laser rangefinder is 3.5 to 5000 meters.
[0070] According to the ranging method, rangefinders are divided into phase-based rangefinders and pulse-based rangefinders. Pulse-based laser rangefinders emit a single or a series of short pulsed laser beams toward the target during operation. The laser beam reflected by the target is received by photoelectric elements, and a timer measures the time from emission to reception of the laser beam to calculate the distance from the observer to the target.
[0071] Understandably, the ratio of the propagation speed of light in the shallow water environment to be tested can be obtained by first measuring the propagation speed of light in the air and the propagation speed of light in the water environment to be tested, and then calculating the ratio of the propagation speed of light in the two propagation media.
[0072] In some implementations, step S100, obtaining the propagation speed ratio of light in the shallow water environment to be tested, may also include the following steps:
[0073] S101: The water depth Y in the calibration area is measured by laser measurement at multiple calibration points using a water depth measurement component. The water quality environment of the calibration area is the same as that of the shallow water environment to be measured.
[0074] S102: Obtain the actual water depth X at multiple corresponding calibration points;
[0075] S103: Based on the laser-measured water depth Y at multiple calibration points and the corresponding actual water depth X, a linear regression function Y = a*X + b is obtained, where the slope a in the linear regression function is the propagation speed ratio.
[0076] In step S101, the water depth measuring component is moved to the calibration point. A ranging laser is emitted from the laser rangefinder 2 towards the riverbed at the calibration point. The height difference L1 between the laser rangefinder 2 and the riverbed bottom is obtained based on the time it takes for the laser laser to be reflected back to the laser rangefinder 2. Combined with the height difference L2 between the laser rangefinder and the water surface, the laser-measured water depth Y can be obtained, where Y = L1 - L2.
[0077] In some implementations, when obtaining the actual water depth X of multiple corresponding calibration points in step S102, the following steps are also included:
[0078] The water in the calibration area is drained, and the actual depth of the corresponding calibration point is measured using a water depth measuring device.
[0079] The actual water depth X of the calibration point before drainage is obtained based on the actual depth of the calibration point after drainage and the water surface height before drainage.
[0080] In other words, in this application, after draining the water from the calibration area, there is no water in the calibration area. During the laser measurement process, the propagation speed is constant and equal to the propagation speed in the air. The height difference L3 between the calibration point and the laser rangefinder 2 can be measured using the laser rangefinder 2. Combined with the height difference L2 between the laser rangefinder 2 and the water surface measured in step S102, we can obtain X = L3 - L2.
[0081] Since the laser-measured water depth Y at multiple calibration points and the actual water depth X at the corresponding calibration points can be plotted, the following can be obtained: Figure 6 The scatter plot shown can be used to obtain the linear regression function Y = a*X + b, for example. Figure 6 The multiple sets of measurement data shown in the figure yield a linear regression function of Y = *X, that is, the propagation speed ratio a is 0.7341 and b is 0.
[0082] Compared to measuring the speed of light in water and combining it with the speed of light in air to obtain the propagation speed ratio, this method eliminates the step of measuring the speed of light propagation, making the measurement process much simpler.
[0083] Understandably, the calibration area here can be a river engineering model filled with the same water quality, or it can be measured in a basin or bucket filled with the same water quality.
[0084] Understandably, in some cases, if the water depth in the calibration area is relatively deep, underwater ultrasonic measuring instruments can be used to measure the actual water depth X at the calibration point directly. If the riverbed in the calibration area is made of hard material (such as plastic, metal, etc.), then contact-type depth measurement methods such as the steel tape method can be used to measure the actual water depth X.
[0085] In some implementations, the second water depth data is obtained by calibration using the following formula:
[0086] H2 = H1 / a, where H1 is the first water depth data, a is the propagation speed ratio, and H2 is the second water depth data.
[0087] The second water depth data obtained by calibrating the propagation speed ratio is more consistent with the actual water depth.
[0088] In some implementations, the water depth measurement component also includes an ultrasonic rangefinder 3 located above the river surface;
[0089] In step S200, obtaining the first water depth data of the area to be measured based on the laser rangefinder 2 of the water depth measurement component includes the following steps:
[0090] The first elevation (i.e., the height difference between the laser rangefinder 2 and the riverbed) is measured by emitting a laser from the laser rangefinder 2 above the water surface to the riverbed to be driven.
[0091] The ultrasonic rangefinder 3 above the water surface emits ultrasonic waves to the river surface in the area to be measured to obtain the second elevation, D2 (i.e., the height difference between the ultrasonic rangefinder 3 and the river surface); the elevation difference D3 between the laser rangefinder 2 and the ultrasonic rangefinder 3 is obtained, and the first water depth data H1 is obtained based on the elevation difference D3, the first elevation D1 and the second elevation D2.
[0092] If the laser rangefinder 2 is located above the ultrasonic rangefinder 3, then H1 = D1 - D2 - D3; if the laser rangefinder 2 is located below the ultrasonic rangefinder 3, then H1 = D1 + D3 - D2.
[0093] In some implementations, the hydrological measurement method further includes the following steps: moving the water depth measurement component along the riverbed cross section to obtain second water depth data at multiple measurement points on the riverbed cross section;
[0094] A topographic model of the riverbed cross section is obtained by combining the horizontal positions of multiple measurement points and the second water depth data of each measurement point.
[0095] In other words, this application enables the creation of a topographic model of a riverbed cross-section by measuring water depth data from multiple measurement points (such as...). Figure 7 The "corrected" topographic curve (as described in the text) is almost equivalent to the topographic curve measured in a "waterless" environment. Here, the "waterless" topographic curve corresponds to the topographic curve obtained after draining the water outlet in the shallow water area to be measured. Compared to the "water-bearing" topographic curve obtained directly using laser measurement, it can more accurately show the actual shape of the riverbed and does not require draining the water.
[0096] Secondly, this application also provides a measuring device, which includes a main body 1, a water depth measuring component mounted on the main body 1, the water depth measuring component including a laser rangefinder 2 and an ultrasonic rangefinder 3, both of which are located above the water surface. The laser rangefinder 2 is used to emit a measuring sensor towards the riverbed to measure a first elevation, the ultrasonic rangefinder 3 is used to emit ultrasonic waves towards the river surface to measure a second elevation, and a controller 4 is connected to the water depth measuring component to obtain first water depth data based on the first elevation and the second elevation.
[0097] It can measure the water depth of the riverbed without contacting the riverbed surface and does not require the probe to be inserted underwater, making it very suitable for water depth measurement in shallow water environments.
[0098] In some cases, the controller 4 may store the above-mentioned hydrological measurement method. The controller 4 is used to calibrate the first water depth data according to the propagation speed ratio of the shallow water environment to be measured to obtain the second water depth data.
[0099] The propagation speed ratio can be pre-stored in the controller 4, or it can be measured using the above-mentioned hydrological measurement method.
[0100] When using the measuring device provided in this application to measure water depth, a laser rangefinder 2 can be used to emit a laser to the riverbed to obtain a first elevation, and the first elevation D1 can be sent to the controller 4 installed on the main body 1.
[0101] Then, the ultrasonic rangefinder 3 emits ultrasonic waves towards the water surface to obtain the second elevation D2, and transmits the second elevation D2 to the controller 4. The controller 4 obtains the first water depth data H1 based on D1, D2, and the height difference D3 between the laser rangefinder 2 and the ultrasonic rangefinder 3.
[0102] Then, controller 4 uses the stored propagation speed ratio 'a' to calibrate the first water depth data H1 to obtain the second water depth data H2. This enables water depth measurement in shallow water environments, avoiding the damage to the riverbed environment caused by using a steel ruler to measure water depth.
[0103] In some implementations, the measuring device also includes a reflective vertical plate 5, and a horizontal rangefinder connected to the controller 4 is installed on the main body 1. The horizontal rangefinder is used to transmit a measuring signal toward the reflective vertical plate 5 to measure the horizontal distance between the main body 1 and the reflective vertical plate 5.
[0104] Based on the horizontal distance measured by the horizontal distance measuring instrument, the current horizontal position of the measuring device can be determined, and thus the coordinates of a point on the riverbed can be obtained by combining the second water depth data measured at the current horizontal position.
[0105] Understandably, a horizontal rangefinder can be a device that uses lasers or ultrasound to measure distances.
[0106] See Figures 2 to 5As shown, in some implementations, the measuring device further includes a measuring platform 6 extending along the riverbed cross-section. A reflector is disposed on one side of the measuring platform 6 along the extension direction of the riverbed cross-section. Rollers 13 are also installed on the main body 1, enabling the main body 1 to move along the extension direction of the riverbed cross-section. A controller is connected to the rollers 13 and can drive the rollers to roll on the measuring platform, thereby realizing the movement of the main measuring platform 6. Specifically, a drive motor connected to the rollers is provided on the main body, and the controller is connected to the drive motor. By controlling the drive motor, the controller controls the rotation of the rollers, thereby realizing the movement of the main body on the measuring platform.
[0107] During hydrological measurements using the measuring device provided in this application, the second water depth data of a measuring point can be obtained each time the main body 1 moves along the riverbed cross-section using the water depth measuring component and the controller 4. Combined with the horizontal distance between the main body 1 and the reflective vertical plate 5 measured by the horizontal distance measuring instrument on the main body 1 at this time, the horizontal position of the measuring point on the riverbed cross-section can be obtained.
[0108] Then, by moving the main body 1 at a specific step size, and combining the measurement data from multiple measurement points, a model of the riverbed cross-section can be obtained.
[0109] As shown in the figure, in some implementations, the measurement platform 6 is a bridge spanning the riverbed. Understandably, in other implementations, the measurement platform 6 can also be a boat floating on the water, or a pier or support structure assumed to be in the river.
[0110] See Figure 4 as well as Figure 5 As shown, in some implementations, the measurement directions of both the laser rangefinder 2 and the ultrasonic rangefinder 3 are vertical, while the measurement direction of the horizontal rangefinder is horizontal.
[0111] In some implementations, the main body 1 is provided with a vertically extending slide rail 11, and the ultrasonic rangefinder 3 is slidably mounted on the slide rail 11. During use, the height between the ultrasonic rangefinder 3 and the water surface can be adjusted by sliding the ultrasonic rangefinder 3 vertically. This avoids excessive ultrasonic measurement errors caused by the ultrasonic rangefinder 3 being too close to the water surface.
[0112] See Figures 3 to 5 As shown, in some implementations, a marking ruler 12 is mounted on the slide rail 11, the scale lines of the marking ruler 12 are arranged along the extension direction of the slide rail 11, and the zero mark of the marking ruler 12 is at the same height as the probe of the laser rangefinder 2.
[0113] During the measurement, the height difference D3 between the ultrasonic rangefinder 3 and the laser rangefinder 2 can be measured by the marking ruler 12, so that the first water depth data H1 can be obtained based on the first elevation D1 measured by the laser rangefinder 2 and the second elevation D2 measured by the ultrasonic rangefinder 3.
[0114] In some implementations, the marking ruler 12 is slidably mounted on the slide rail 11, and an indicator plate that slides horizontally is mounted at the zero mark of the marking ruler 12. The indicator plate can slide horizontally to below the laser rangefinder.
[0115] In other words, the height of the marker ruler 12 can be vertically adjusted along the slide rail 11. During the vertical adjustment of the marker ruler 12, the indicator plate 15 of the marker ruler 12 can be extended horizontally, positioning it below the laser rangefinder. When the indicator plate 15 is aligned with the probe of the laser rangefinder, the height of the marker ruler 12 is accurate. The marker ruler 12 is then fixed, and the indicator plate 15 is slid back, blocking the laser beam from the laser rangefinder. It is understood that the marker ruler 12 can be locked or unlocked by inserting screws into the guide rail, preventing it from shifting vertically after locking.
[0116] In some implementations, the controller 4 also includes an input device, through which the elevation difference D3 measured according to the marker ruler 12 can be input into the controller 4. This allows the controller 4 to perform relevant calculations to obtain the first water depth data H1.
[0117] It is understandable that in some implementations, a ranging probe facing the laser rangefinder 2 can be installed on the ultrasonic rangefinder 3. The height difference D3 between the ultrasonic rangefinder 3 and the laser rangefinder 2 can be directly measured through the ranging probe. The ranging probe can be electrically connected to the controller 4 to transmit the measured height difference D3 to the controller 4.
[0118] In some implementations, the slide rail 11 has a groove for mounting the ultrasonic rangefinder 3, and the slide rail 11 is provided with a threaded hole that communicates with the groove. A locking screw 14 is threadedly connected to the threaded hole. The locking screw 14 is used to abut against the mounting base of the ultrasonic rangefinder 3 and to press the mounting base into the groove, thereby locking the ultrasonic rangefinder 3.
[0119] See Figures 3 to 5 As shown, in some implementations, the ultrasonic rangefinder 3 is detachably slidably mounted on the slide rail 11. Specifically, the ultrasonic rangefinder 3 can be removed from the slide rail 11 by unscrewing the locking screw 14 from the threaded hole and then sliding the ultrasonic rangefinder 3 out of the slide groove. When the ultrasonic rangefinder 3 is damaged, it can be slid out of the slide rail 11 first, and then a new ultrasonic rangefinder 3 can be inserted into the slide groove to replace the ultrasonic rangefinder 3.
[0120] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A measuring device for shallow water environments, characterized in that, It includes: A measurement platform is set above the riverbed, and the measurement platform is located above the water surface; The main body is positioned above the measuring platform; A water depth measurement assembly, installed on the main body, includes a laser rangefinder and an ultrasonic rangefinder. Both the laser rangefinder and the ultrasonic rangefinder measure in a vertical direction and are located above the water surface. The laser rangefinder emits a measuring laser towards the riverbed to obtain a first elevation, and the ultrasonic rangefinder emits ultrasonic waves towards the river surface to obtain a second elevation. A controller, which is connected to the water depth measurement component.
2. The measuring device according to claim 1, characterized in that, It also includes, Reflector vertical plate; The main body is also equipped with a horizontal rangefinder connected to the controller. The horizontal rangefinder is used to emit a measurement signal toward the reflective vertical plate to measure the horizontal distance between the main body and the reflective vertical plate.
3. The measuring device according to claim 2, characterized in that, It also includes, The measuring platform extends along the riverbed cross-section, and the reflective vertical plate is located on one side of the measuring platform along the direction of its extension along the riverbed cross-section. The main body is also equipped with rollers, and the controller is connected to the rollers so that the main body can move along the extension direction of the riverbed cross section.
4. The measuring device according to claim 3, characterized in that, The main body is equipped with a drive motor connected to the roller, and the controller is connected to the drive motor to control the rotation of the roller.
5. The measuring device according to claim 2, characterized in that, The horizontal rangefinder measures in the horizontal direction.
6. The measuring device according to any one of claims 1-4, characterized in that, It also includes, The main body is provided with a vertically extending slide rail, and the ultrasonic rangefinder is slidably mounted on the slide rail.
7. The measuring device according to claim 6, characterized in that, It also includes, A marking ruler is installed on the slide rail, and the scale lines of the marking ruler are arranged along the extension direction of the slide rail, with the zero mark of the marking ruler at the same height as the probe of the laser rangefinder.
8. The measuring device according to claim 7, characterized in that, The marking ruler is slidably mounted on the slide rail, and an indicator plate that slides horizontally is installed at the zero mark of the marking ruler. The indicator plate can slide to below the laser rangefinder.
9. The measuring device according to claim 7, characterized in that, It also includes, The slide rail has a groove for mounting the ultrasonic rangefinder, and the slide rail is provided with a threaded hole that communicates with the groove. A locking screw is threaded into the threaded hole. The locking screw is used to abut against the mounting base of the ultrasonic rangefinder and to press the mounting base into the groove, thereby locking the ultrasonic rangefinder.
10. The measuring device according to claim 6, characterized in that, It also includes, The ultrasonic rangefinder is detachably and slidably mounted on the slide rail.