River channel underwater terrain reconstruction method, device, equipment and medium
By combining remote sensing image data and hydrological station actual measurement data, the underwater terrain of the river channel is constructed, and the triangular generalization analysis of the river channel flow section is carried out to determine the water depth calculation model, which solves the problems that factors such as the offset of the river center line in the existing technology have not been fully considered, and improves the accuracy and reliability of underwater terrain reconstruction during the dry flood transition period.
Patent Information
- Application Number
- CN202510307526.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-07-01
AI Technical Summary
When processing data from the transition phase of the dry season to the flood season, existing underwater terrain reconstruction technology fails to fully consider factors such as the offset of the river center line, resulting in a large deviation from the actual situation.
By combining remote sensing image data and hydrological station actual measurement data, the underwater terrain of the river channel is constructed, and the triangular generalization analysis of the river channel flow section is carried out to determine the water depth calculation model, and the underwater terrain of the river channel is reconstructed.
It improves the accuracy and reliability of underwater terrain reconstruction during the transition period of dry flood season, and can more accurately reflect the dynamic changes of the river channel.
Smart Images
Figure CN120232397A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of hydrogeomorphology, and particularly to a method, device, equipment and medium for reconstructing underwater terrain of a river channel. Background Art
[0002] Traditional underwater terrain measurement techniques mainly rely on on-site surveys. Although this method can provide relatively accurate data, its operation process is complex, time-consuming, costly, and there are significant safety risks in on-site surveys in some inaccessible or harsh environments. With the development of science and technology, how to improve the efficiency and accuracy of underwater terrain measurement has become the focus of research.
[0003] Under natural conditions, rivers in the Northern Hemisphere are affected by the Coriolis effect generated by the Earth's rotation, and the river water tends to flow towards the right bank. Under the constraint of the river bank, this flow will cause the water level on the right side to be higher than that on the left side, and further result in a greater water flow impact force on the right bank. Over time, the right bank will be steeper than the left bank. In addition, the shape of the river is also jointly affected by hydrological processes and geological effects, such as seasonal water volume changes, sediment transport, etc. These factors act together to make the shape of the river channel highly dynamic and complex. Especially during the transition stage from the dry season to the flood season, due to the sharp increase in water volume, the hydrodynamic conditions of the river change significantly, resulting in the offset of the position of the river channel center line. However, when existing underwater terrain reconstruction techniques process data during this period, they often deviate significantly from the actual situation because they fail to fully consider factors such as the offset of the river channel center line.
[0004] In recent years, remote sensing images can provide high-resolution water surface information, and remote sensing technology has played an extremely important role in establishing the water surface terrain. For example, technologies such as unmanned aerial vehicle stereo mapping, aerial triangulation measurement of remote sensing images, radar monitoring, and laser monitoring can be directly used to obtain the terrain above the water line. Therefore, in order to solve the problems existing in the prior art and improve the accuracy and reliability of underwater terrain reconstruction in the dry season, there is an urgent need to provide an underwater terrain reconstruction technology that can effectively combine remote sensing technology and traditional measurement methods. Summary of the Invention
[0005] To solve the above problems, a method, device, equipment and medium for reconstructing underwater terrain of a river channel provided by the present invention can improve the accuracy and reliability of underwater terrain reconstruction during the dry-flood transition period.
[0006] To achieve the above object, the present invention adopts the following technical solutions:
[0007] In a first aspect, the present invention provides a method for reconstructing underwater terrain of a river channel, including:
[0008] Based on the remote sensing image data and the measured data of the hydrological station in the study area, construct the underwater topography of the river channel;
[0009] Based on the measured data of the hydrological station, the offset of the river channel center line from the dry season to the flood season, and the corresponding change in the eccentricity angle, conduct a triangular generalization analysis of the cross-sectional flow area of the river channel in the study area to determine the water depth calculation model of the underwater topography of the river channel;
[0010] Based on the water surface width of the cross-sectional flow area of the river channel corresponding to the water surface vector obtained from the remote sensing image data, use the water depth calculation model to reconstruct the underwater topography of the river channel.
[0011] Furthermore, based on the remote sensing image data and the measured data of the hydrological station in the study area, construct the underwater topography of the river channel, including:
[0012] Obtain the remote sensing image data and the measured data of the hydrological station during the transition period from the dry season to the flood season in the study area;
[0013] Preprocess the remote sensing image data during the transition period from the dry season to the flood season in the study area;
[0014] According to the water surface vector extracted from the remote sensing image data, the cross-sectional data and water level data in the measured data of the hydrological station, construct the initial underwater topography of the river channel.
[0015] Furthermore, after constructing the initial underwater topography of the river channel according to the water surface vector extracted from the remote sensing image data, the cross-sectional data and water level data in the measured data of the hydrological station, it also includes:
[0016] Generate the river channel center line based on the water surface vector extracted from the remote sensing image data, and set multiple cross-sectional flow areas perpendicular to the water flow direction on the river channel center line. The cross-sectional flow areas select the cross-sectional data in the measured data of the hydrological station.
[0017] Furthermore, based on the measured data of the hydrological station, the offset of the river channel center line from the dry season to the flood season, and the corresponding change in the eccentricity angle, conduct a triangular generalization analysis of the cross-sectional flow area of the river channel in the study area to determine the water depth calculation model of the underwater topography of the river channel, including:
[0018] Generalize the cross-sectional flow area of the river channel in the study area into triangular cross-sections. The cross-sectional flow areas select the cross-sectional data in the hydrological measured data;
[0019] Based on the water level data corresponding to the cross-sectional flow area in the measured data of the hydrological station, analyze the offset of the center line of the triangular cross-section to determine the relationship between the water depth, water surface width, and eccentricity angle of the river channel at different water levels during the transition period from the dry season to the flood season;
[0020] Determine the relationship between the water depth, water surface width, and eccentricity angle of the river channel at different water levels during the transition period from the dry season to the flood season as the water depth calculation model of the underwater topography of the river channel.
[0021] In a second aspect, the present invention further provides a device for reconstructing the underwater topography of a river channel, comprising:
[0022] a construction module for constructing the underwater topography of the river channel based on the remote sensing image data and the measured data of the hydrological station in the study area of the river channel;
[0023] a determination module for performing triangular generalization analysis on the cross-sectional flow area of the river channel in the study area based on the measured data of the hydrological station, the offset of the river channel center line from the dry season to the flood season, and the corresponding change in the eccentric angle, and determining the water depth calculation model of the underwater topography of the river channel;
[0024] a reconstruction module for reconstructing the underwater topography of the river channel by using the water depth calculation model based on the water surface width corresponding to the water surface vector obtained from the remote sensing image data and the cross-sectional flow area of the river channel.
[0025] Furthermore, the construction module is further configured to:
[0026] obtain the remote sensing image data and the measured data of the hydrological station during the transition period from the dry season to the flood season in the study area of the river channel;
[0027] preprocess the remote sensing image data during the transition period from the dry season to the flood season in the study area of the river channel;
[0028] construct the initial underwater topography of the river channel according to the water surface vector extracted from the remote sensing image data, the cross-sectional data, and the water level data in the measured data of the hydrological station.
[0029] Furthermore, after constructing the initial underwater topography of the river channel according to the water surface vector extracted from the remote sensing image data, the cross-sectional data, and the water level data in the measured data of the hydrological station, it further includes:
[0030] generate the river channel center line based on the water surface vector extracted from the remote sensing image data, and set a plurality of cross-sectional flow areas perpendicular to the water flow direction on the river channel center line, and the cross-sectional flow areas select the cross-sectional data in the measured data of the hydrological station.
[0031] Furthermore, the determination module is further configured to:
[0032] generalize the cross-sectional flow area of the river channel in the study area into a triangular cross-section, and the cross-sectional flow areas select the cross-sectional data in the hydrological measured data;
[0033] analyze the offset of the center line of the triangular cross-section based on the water level data corresponding to the cross-sectional flow area in the measured data of the hydrological station, and determine the relationship between the water depth of the river channel, the water surface width, and the eccentric angle at different water levels during the transition period from the dry season to the flood season of the cross-sectional flow area;
[0034] The relationship between the water depth, water surface width, and eccentric angle of the cross-sectional area of flow at different water levels during the transition from the dry season to the flood season in the river is determined as the water depth calculation model for the underwater topography of the river channel.
[0035] In a third aspect, the present invention also provides an electronic device, including: a processor and a memory;
[0036] The processor is coupled to the memory;
[0037] Wherein, the processor is configured to read and execute the program or instruction stored in the memory, so that the device executes the method as described in the first aspect.
[0038] In a fourth aspect, the present invention also provides a computer-readable storage medium storing a computer program, and when the program is executed by a processor, the method as described in the first aspect is implemented.
[0039] The technical solution provided by the present invention has at least the following technical effects or advantages:
[0040] The technical solution of the present invention constructs the underwater topography of the river channel and reconstructs the underwater topography by collecting remote sensing image data and measured data from hydrological stations in the study area of the river channel. The remote sensing image data can provide high-resolution water surface information, and the measured data from hydrological stations provide basic data support for reconstructing the underwater topography and provide accurate hydrological parameters. When reconstructing the underwater topography, the cross-sectional area of flow of the river channel is generalized as a triangular cross-section, and the offset of the center line of the cross-sectional area of flow corresponding to the water surface of the river channel at different water levels during the transition from the dry season to the flood season in the river channel is analyzed to determine the relationship between the water depth of the water surface of the river channel, the water surface width, and the eccentric angle, and further determine the water depth calculation model for the underwater topography of the river channel. Based on the water surface width of the river channel extracted from the remote sensing image data and the water depth calculation model, the reconstruction of the underwater topography of the river channel is completed.
[0041] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0043] Figure 1 It is a schematic flow chart of a method for reconstructing the underwater topography of a river channel in an embodiment of the present invention;
[0044] Figure 2 In the embodiment of the present invention, the schematic diagram of the water depth calculation model is determined by analyzing the generalized triangular cross-section.
[0045] Figure 3 The structural schematic diagram of a river underwater terrain reconstruction device in the embodiment of the present invention.
[0046] Figure 4 The structural schematic diagram of an electronic device provided in the embodiment of the present invention. Specific embodiments
[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. 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 protection scope of the present invention.
[0048] Figure 1 The flowchart of a river underwater terrain reconstruction method in the embodiment of the present invention is shown as follows. The method includes:
[0049] S101. Based on the remote sensing image data and the measured data of the hydrological station of the river in the study area, construct the underwater terrain of the river.
[0050] 1. Obtain the remote sensing image data and the measured data of the hydrological station during the transition period from the dry season to the flood season of the river in the study area.
[0051] 1) Collect the measured data of the hydrological station during the transition period from the dry season to the flood season of the river in the study area, including large cross-section data, daily water level data, and runoff sequence data. These data can provide accurate hydrological parameters, help verify and calibrate the accuracy of remote sensing data, and provide basic data support for underwater terrain reconstruction.
[0052] 2) Through the hydrological runoff sequence data, draw the runoff hydrograph, determine the dry-season runoff period, limit the remote sensing image acquisition period, and then collect the high-resolution optical remote sensing images during the limited period from the dry season to the flood season of the river in the study area, including but not limited to satellite remote sensing images such as Landsat series, Sentinel series, Keyhole series, and High-Resolution series. These remote sensing image data can provide high-resolution water surface information for extracting the water surface vector and calculating the water surface width.
[0053] 3) Collect on-site measured data during the transition period from the dry season to the flood season in the study area's river channels, including: UAV aerial survey images and underwater terrain data collected by an unmanned boat equipped with an Acoustic Doppler Current Profiler (ADCP). The UAV aerial survey images can provide high-resolution ground and water surface information, while the ADCP data can accurately measure underwater flow velocities and terrain features. Use the on-site measured data to verify the collected remote sensing data and the river channel centerline to ensure the reliability and accuracy of the data.
[0054] 2. Preprocess the remote sensing image data during the transition period from the dry season to the flood season in the study area's river channels;
[0055] Radiometric calibration: Use remote sensing image processing tools to perform radiometric calibration on the remote sensing images, and correct the pixel values of the images to actual reflectance or brightness to eliminate the influence of sensor response differences.
[0056] Atmospheric correction: Perform atmospheric correction to eliminate the influence of atmospheric scattering and absorption on the images, and ensure that the spectral information of the images can accurately reflect the true conditions of the earth's surface.
[0057] Water surface vector extraction: Extract water surface vectors, and the extraction methods include but are not limited to water body index method, threshold segmentation method, and deep learning method. These extraction methods can effectively identify and extract the water body boundary, providing accurate water surface information for subsequent analysis.
[0058] 3. Construct the initial underwater terrain of the river channel based on the water surface vectors extracted from the remote sensing image data and the cross-section data and water level data from the hydrological station's measured data;
[0059] Based on the water surface vectors extracted from the remote sensing image data and the cross-section data and water level data from the hydrological station's measured data, use geographic information system tools to construct the initial underwater terrain.
[0060] River channel centerline generation: In the initial underwater terrain, generate the river channel centerline based on the extracted water surface vectors. The river channel centerline should accurately reflect the actual flow direction of the river as much as possible.
[0061] Cross-section setting: Set multiple cross-sections perpendicular to the water flow direction on the river channel centerline (the measured large cross-section data of the hydrological station), and extract the water surface width of each cross-section. These cross-sections are preferably selected in the river reaches near the hydrological station to facilitate verifying the extraction accuracy and subsequent analysis.
[0062] Verification of on-site measured data: Use UAV aerial survey images and ADCP data to verify the extracted water surface vectors and the river channel centerline to ensure the reliability and accuracy of the data.
[0063] S102. Based on the measured data of hydrological stations, the offset of the river channel centerline from the dry season to the flood season, and the corresponding change in the eccentric angle, conduct a triangular generalization analysis on the cross-section of the river channel in the study area to determine the water depth calculation model of the underwater terrain of the river channel;
[0064] Generalization of the river channel cross-section:
[0065] The cross-section of the river channel has various forms, but in the reconstruction of the underwater terrain, generalizing the geometric shape of the cross-section can simplify the calculation and improve the efficiency. For mountainous rivers, there is basically only one main river channel. According to the large cross-section data of hydrological stations collected, the cross-section of the river channel below the dry season water level is basically an obtuse triangle with the deep trough biased to one side. It can approximately reflect the morphological changes of the river channel at different water levels. Especially in the case where the river width and water depth change with the water volume, it can quickly and effectively estimate the cross-sectional area and water depth. Although other forms may be more accurate in some cases, the triangular form can provide sufficient accuracy under complex natural conditions.
[0066] To simplify the calculation and analysis, the cross-section of the river channel in the study area during the transition from the dry season to the flood season is generalized into a triangular cross-section. The generalized triangular cross-section can better reflect the changes in the underwater terrain. Especially in the river reaches with drastic changes in water volume, it can better show the changing trends of water depth and flow velocity. During the flood season, the scouring of the river channel by the water flow will cause the morphological changes of the river channel to intensify. The upper part (the part close to the water surface) of the river channel cross-section is usually wider, and as the water depth increases, the cross-section gradually narrows, forming a triangular structure.
[0067] The triangular cross-section in the dry season and the triangular cross-section in the flood season are similar triangles after generalization, with the same geometric shape but different scales.
[0068] Determination of variable relationships:
[0069] By analyzing the generalized triangular cross-section, it can be seen that during the transition from the dry season to the flood season of the river channel in the study area, as the water surface width increases, the offset of the river channel centerline increases, the water depth also increases, and the eccentric angle corresponding to the river channel centerline also increases accordingly. Thus, it can be determined that the offset of the river channel centerline, the eccentric angle corresponding to the offset of the river channel centerline, the water depth are in a proportional relationship with the water surface width.
[0070] Figure 2 This is the schematic diagram for analyzing the generalized triangular cross-section in the embodiment of the present invention to determine the water depth calculation model.
[0071] Determine the water depth calculation model of the underwater terrain of the river channel:
[0072] Select the annual cross-section data and daily water level data measured at hydrological stations during the transition period from the dry season to the flood season in the study area, calculate the unique cross-sectional area of flow corresponding to different water levels and the corresponding water surface width, and calculate the water depth at different water levels under the generalized triangular cross-section morphology. During the flood season, there is a unique maximum water level and maximum water surface width, corresponding to the maximum offset of the river centerline. That is, the maximum water surface width during the flood season has the maximum offset of the river centerline relative to any water surface width during the transition period from the dry season to the flood season. The offset of the river centerline is closely related to the morphology and hydrodynamics of the river. The eccentric angle can reflect the offset of the river centerline.
[0073] Based on the flood season cross-sectional area, maximum water surface width during the flood season, dry season cross-sectional area, and dry season water surface width at different water levels during the transition period from the dry season to the flood season of the cross-section of the river in the study area, analyze the offset of the triangular cross-section centerline, and determine the relationship between the water depth, water surface width, and eccentric angle of the river at different water levels during the transition period from the dry season to the flood season. This relationship expression is the water depth calculation model.
[0074] Based on the flood season cross-sectional area, maximum water surface width during the flood season, dry season cross-sectional area, and dry season water surface width at a specified water level during the transition period from the dry season to the flood season of the cross-section of the river in the study area, determine the offset angles corresponding to multiple river centerlines at the maximum water level during the flood season and at different water levels during the transition period from the dry season to the flood season;
[0075] For the selected cross-section data, according to the flood season cross-sectional area A xun and the maximum water surface width w xun during the flood season, determine the corresponding flood season water depth h xun ; according to the flood season cross-sectional area A i and the water surface width w i at a specified water level during the transition period from the dry season to the flood season, determine the corresponding dry season water depth h i ;
[0076] Since the cross-section of flow is a generalized triangular cross-section, calculate the flood season cross-sectional area and maximum water surface width corresponding to the maximum water level during the flood season of this cross-section, as well as the dry season cross-sectional area and dry season water surface width corresponding to a specified water level during the transition period from the dry season to the flood season, and calculate the flood season water depth h xun and the dry season water depth h i according to the following formula:
[0077]
[0078] In the formula, A xun is the flood season cross-sectional area at the maximum water level, A i is the flood season cross-sectional area at the specified water level, w xun is the maximum water surface width during the flood season, w iThe water surface width under the specified water level.
[0079] Based on the maximum water surface width during the flood season and the specified water surface width during the transition period from the dry season to the flood season, calculate the offset a of the river channel centerline:
[0080]
[0081] Based on the maximum offset of the river channel center during the flood season and the similarity of the triangular cross-section, determine the eccentric angle tanθ corresponding to the centerline of the cross-section at different water levels:
[0082]
[0083] In the formula, tanθ is the eccentric angle of the river channel cross-section at different water levels.
[0084] Since the river channel cross-section may have different eccentric angles at different water levels, calculating the average value of the eccentric angles at different water levels helps to give an overall reflection across the entire river reach, and can avoid overly detailed errors when there are large local variations. Calculating the average value can ensure the stability and operability of the model. Take the average value of the offset angles corresponding to multiple river channel centerlines, and determine the average offset angle as the fixed offset angle.
[0085]
[0086] In the formula, is the fixed offset angle, and n is the amount of data of the offset angles used when calculating the fixed offset.
[0087] Determine the relationship between the water depth, water surface width, and fixed offset angle of the river channel at different water levels during the transition period from the dry season to the flood season as the water depth calculation model.
[0088]
[0089] In the formula, h θ-i is the water depth corresponding to different water levels for the fixed eccentric angle.
[0090] S103. Based on the water surface width of the river channel cross-section corresponding to the water surface vector obtained from the remote sensing image data, use the water depth calculation model to reconstruct the underwater topography of the river channel.
[0091] Based on the water surface vector of the river channel in the study area extracted from the remote sensing image data during the transition period from the dry season to the flood season, obtain the maximum water surface width corresponding to the maximum water level and the dry season water surface width corresponding to different water levels, and use the water depth calculation model to determine the dry season water depth corresponding to different water levels for the fixed eccentric angle;
[0092] Based on the determined dry season water depths corresponding to different water levels, reconstruct the water depth of the underwater topography of the river channel, and then complete the reconstruction of the underwater topography of the river channel.
[0093] The technical solution in the embodiment of the present invention has at least the following technical effects or advantages:
[0094] The technical solution of the present invention constructs the underwater topography of the river channel by collecting remote sensing image data and hydrological station measured data of the river channel in the study area, and reconstructs the underwater topography. The remote sensing image data can provide high-resolution water surface information, and the hydrological station measured data provides basic data support for the reconstruction of the underwater topography and provides accurate hydrological parameters. When reconstructing the underwater topography, the cross-section of the river channel is generalized into a triangular cross-section, and the offset of the center line of the cross-section corresponding to the water surface of the river channel at different water levels during the transition from the dry season to the flood season of the river channel is analyzed to determine the relationship between the water depth of the water surface river channel, the water surface width, and the eccentric angle, and then the water depth calculation model of the underwater topography of the river channel is determined. Based on the river channel water surface width extracted from the remote sensing image data and the water depth calculation model, the reconstruction of the underwater topography of the river channel is completed. The solution of the present invention can improve the accuracy and reliability of the reconstruction of the underwater topography during the dry-flood transition period.
[0095] Figure 3 The present invention provides a device for reconstructing the underwater topography of a river channel. As shown in the figure, the device includes:
[0096] A construction module for constructing the underwater topography of the river channel based on the remote sensing image data of the river channel in the study area and the measured data of the hydrological station;
[0097] A determination module for performing triangular generalization analysis on the cross-section of the river channel in the study area based on the measured data of the hydrological station, the offset of the river channel center line from the dry season to the flood season, and the corresponding change in the eccentric angle, and determining the water depth calculation model of the underwater topography of the river channel;
[0098] A reconstruction module for reconstructing the underwater topography of the river channel by using the water depth calculation model based on the water surface width of the water surface vector corresponding to the river channel cross-section obtained from the remote sensing image data.
[0099] It should be noted that, for the sake of convenience of description, Figure 3 Exemplarily, only the main modules of the structure of the device for reconstructing the underwater topography of the river channel are shown. In practical applications, the system may also include modules or components not shown in the figure; the system is not limited to the above module structure and may also be other module structures for implementing the above method embodiments.
[0100] Figure 4 The present invention provides a schematic structural diagram of an electronic device. As shown in the figure, the electronic device includes: a processor and a memory;
[0101] Among them, the processor is used to read and execute the programs and instructions stored in the memory, so that the electronic device executes the above method embodiments.
[0102] It should be noted that for the sake of convenience of description, Figure 4 Exemplarily, only the main components of the electronic device are shown. In actual applications, the electronic device may also include components or assemblies not shown in the figure.
[0103] The present invention also provides a computer-readable storage medium storing a program or instructions. When the computer reads and executes the program or instructions, the computer is caused to execute the above method embodiments.
[0104] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for reconstructing underwater terrain of a river, characterized in that: include: Based on the remote sensing image data of the river in the study area and the measured data of the hydrological station, the underwater topography of the river is constructed; Based on the measured data of the hydrological station and the deviation of the centerline of the river from the dry season to the flood season and the corresponding change of the eccentric angle, a triangle generalization analysis was conducted on the flow section of the river in the study area to determine the water depth calculation model of the underwater terrain of the river. Based on the water surface width of the river flow section corresponding to the water surface vector obtained from the remote sensing image data, the water depth calculation model is used to reconstruct the underwater topography of the river.
2. The method for reconstructing underwater terrain of a river channel according to claim 1, characterized in that: The construction of the underwater topography of the river channel based on the remote sensing image data of the river channel in the study area and the measured data of the hydrological station includes: Obtain remote sensing image data and measured data from hydrological stations during the transition period from dry season to flood season in the study area; Preprocess the remote sensing image data during the transition period from dry season to flood season of the river in the study area; The initial river underwater topography is constructed based on the water surface vectors extracted from the remote sensing image data and the cross-section data and water level data from the measured data of the hydrological station.
3. The method for reconstructing underwater river terrain according to claim 2, characterized in that: After constructing the initial river underwater topography based on the water surface vector extracted from the remote sensing image data and the cross-section data and water level data from the measured data of the hydrological station, the method further includes: The center line of the river channel is generated based on the water surface vector extracted from the remote sensing image data, and a plurality of flow sections perpendicular to the water flow direction are set on the center line of the river channel. The flow sections are selected from the section data in the measured data of the hydrological station.
4. The method for reconstructing underwater river terrain according to any one of claims 1 to 3, characterized in that: Based on the measured data of the hydrological station and the offset of the centerline of the river from the dry season to the flood season and the corresponding change in the eccentricity angle, a triangular generalization analysis is performed on the flow section of the river in the study area to determine the water depth calculation model of the underwater terrain of the river, including: The flow section of the river in the study area is generalized into a triangular section, and the flow section is selected from the section data in the hydrological measured data; Based on the water level data corresponding to the flow section in the measured data of the hydrological station, the center line offset of the triangular section is analyzed to determine the relationship between the river channel water depth, water surface width and eccentric angle at different water levels of the flow section during the transition from dry season to flood season; The relationship between the water depth of the river channel and the width of the water surface and the eccentricity angle at different water levels of the flow section during the transition period from the dry season to the flood season is determined as a water depth calculation model for the underwater terrain of the river channel.
5. A river underwater terrain reconstruction device, characterized in that: include: The construction module is used to construct the underwater topography of the river channel based on the remote sensing image data of the river channel in the study area and the measured data of the hydrological station; The determination module is used to perform a triangular generalization analysis on the flow section of the river in the study area based on the measured data of the hydrological station and the offset of the river centerline from the dry season to the flood season and the corresponding change in the eccentricity angle, and determine the water depth calculation model of the underwater terrain of the river; The reconstruction module is used to reconstruct the underwater topography of the river channel based on the water surface width of the river flow section corresponding to the water surface vector obtained from the remote sensing image data and using the water depth calculation model.
6. The device for reconstructing underwater river terrain according to claim 5, characterized in that: The building blocks are also used to: Obtain remote sensing image data and measured data from hydrological stations during the transition period from dry season to flood season in the study area; Preprocess the remote sensing image data during the transition period from dry season to flood season of the river in the study area; The initial river underwater topography is constructed based on the water surface vectors extracted from the remote sensing image data and the cross-section data and water level data from the measured data of the hydrological station.
7. The device for reconstructing underwater river terrain according to claim 6, characterized in that: After constructing the initial river underwater topography based on the water surface vector extracted from the remote sensing image data and the cross-section data and water level data from the measured data of the hydrological station, the method further includes: The center line of the river channel is generated based on the water surface vector extracted from the remote sensing image data, and a plurality of flow sections perpendicular to the water flow direction are set on the center line of the river channel. The flow sections are selected from the section data in the measured data of the hydrological station.
8. The device for reconstructing underwater river terrain according to any one of claims 5 to 7, characterized in that: The determining module is further used for: The flow section of the river in the study area is generalized into a triangular section, and the flow section is selected from the section data in the hydrological measured data; Based on the water level data corresponding to the flow section in the measured data of the hydrological station, the center line offset of the triangular section is analyzed to determine the relationship between the river channel water depth, water surface width and eccentric angle at different water levels of the flow section during the transition from dry season to flood season; The relationship between the water depth of the river channel and the width of the water surface and the eccentricity angle at different water levels of the flow section during the transition period from the dry season to the flood season is determined as a water depth calculation model for the underwater terrain of the river channel.
9. An electronic device, characterized in that: include: Processor and memory; The processor is coupled to a memory; The processor is used to read and execute the program or instruction stored in the memory, so that the device executes the method according to any one of claims 1 to 4.
10. A computer-readable storage medium, characterized in that: A computer program is stored, and when the program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.