River channel cross-section morphology restoration method, device, electronic equipment and storage medium

Abstract

The present application discloses a method, device, electronic device and storage medium for restoring the cross-section morphology of a river channel, and belongs to the field of hydrological data processing technology. The method includes: obtaining N times of hydrological measured data and topographic measured data of the cross-section area of ​​the river channel during the cross-section measurement, inputting the hydrological measured data and topographic measured data corresponding to the 1st to the N-1st times into a sediment model based on hydrodynamics, and obtaining the water level value of the cross-section of the river channel during the cross-section measurement; determining the average elevation value of multiple sub-areas of the cross-section area of ​​the river channel according to the topographic measured data; predicting the elevation change value of the N-1st morphologically unmutated area, the processed flow and sediment content during the N-1st to Nth time through the cross-section morphological relationship, and obtaining the elevation change value of the morphologically mutated area under normal river channel evolution; restoring the cross-section morphology of the cross-section area of ​​the river channel according to the elevation change value of the morphologically mutated area under normal river channel evolution.

Description

Technical Field

[0001] The present application belongs to the technical field of hydrological data processing, and specifically relates to a method, device, electronic equipment and storage medium for restoring the cross-section morphology of a river channel. Background Art

[0002] The morphological evolution of river sections is usually affected by sudden disasters or negative behaviors in human activities, which leads to sudden changes in the morphology of river sections, and then causes sudden changes in water flow patterns, destroying the original natural scouring and siltation trend evolution of the river, which may have adverse effects on flood control, navigation, vegetation coverage, etc. in the long run.

[0003] At present, the evolution trend of the natural river section and the non-uniform evolution characteristics of the section in the lateral direction have not been fully considered. For example, a certain area in the section is affected by sand mining, the riverbed elevation is significantly reduced, and backfilling is required. Usually, the existing technology will directly judge the approximate backfill based on manual experience, or it will be flush with the nearby elevation that is not affected by sand mining. However, the evolution of the cross-sectional morphology of natural rivers has its own laws, and the elevation of the river section is not flat. Empirical treatment may lead to the failure of regulation. For example, the backfill soil will change the original water flow distribution of the section due to the elevation being too high or too low. Under the constant action of the water flow, the geological stability structure of the riverbed section and the nearby river sections will be changed, and the flow state of the upstream and downstream will be changed, thereby breaking the original riverbed evolution law, which has an important impact on flood control management and shipping safety.

[0004] Therefore, the evolution of riverbed and the change of river landform is a complex natural process, which is affected by many factors. Currently, there is an urgent need for a method to effectively restore the cross-sectional morphology of the river. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a method, device, electronic device and storage medium for restoring the cross-sectional morphology of a river channel, which can solve the problem of the current urgent need for a method that can effectively restore the cross-sectional morphology of a river channel.

[0006] In a first aspect, an embodiment of the present application provides a method for restoring a river section morphology, the method comprising:

[0007] Obtain N times of hydrological and topographic measured data of the river section area during the section measurement period, where the Nth time is the measurement when the river section undergoes a sudden change in shape, and the 1st to N-1st times are the measurements when the river section presents the natural river section shape; the hydrological measured data include: water level values, flow and sediment content of upstream and downstream monitoring stations;

[0008] Input the hydrological and topographic measured data corresponding to the 1st to the N-1th times into the sediment model based on hydrodynamics to obtain the water level value of the river section during the section measurement;

[0009] According to the measured terrain data, the average elevation values ​​of multiple sub-areas of the river section area are determined; the multiple sub-areas include: areas with sudden changes in morphology and areas with no sudden changes in morphology;

[0010] According to the average elevation values ​​of multiple sub-areas, the elevation change value corresponding to each sub-area is calculated respectively;

[0011] According to the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the period of time when the river section area was flooded were screened from the hydrological measured data;

[0012] Fit the elevation change values ​​of the area with sudden morphological changes, the elevation change values ​​of the area with no sudden morphological changes, and the flow and sediment content corresponding to the time period when the river section area was flooded to obtain the cross-sectional morphological relationship;

[0013] Through the cross-sectional morphological relationship, the elevation change value of the area without morphological mutation at the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time are predicted, and the elevation change value of the area with morphological mutation under normal river channel evolution is obtained;

[0014] According to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river section area is restored.

[0015] In a second aspect, an embodiment of the present application provides a device for restoring a river section morphology, the device comprising:

[0016] The acquisition module is used to obtain N times of hydrological and topographic measured data of the river section area during the section measurement period, wherein the Nth time is the measurement time when the river section undergoes a sudden change in shape, and the 1st to N-1st times are the measurements when the river section presents the natural river section shape; the hydrological measured data include: water level values, flow and sediment content of upstream and downstream monitoring stations;

[0017] An input module is used to input the hydrological measured data and topographic measured data corresponding to the 1st to the N-1th time into the sediment model based on hydrodynamics to obtain the water level value of the river section during the section measurement;

[0018] A determination module is used to determine the average elevation values ​​of multiple sub-areas of the river section area according to the measured terrain data; the multiple sub-areas include: areas with sudden changes in morphology and areas with no sudden changes in morphology;

[0019] A calculation module is used to calculate the elevation change value corresponding to each sub-area according to the average elevation value of the multiple sub-areas;

[0020] A screening module is used to screen the flow and sediment content corresponding to the flooded time period of the river section area from the hydrological measured data according to the average elevation value of each sub-area and the water level value of the river section;

[0021] The fitting module is used to fit the elevation change value of the area with sudden morphological changes, the elevation change value of the area with no sudden morphological changes, and the flow and sediment content corresponding to the time period when the river section area is flooded, so as to obtain the cross-sectional morphological relationship;

[0022] The prediction module is used to predict the elevation change value of the area with no morphological mutation at the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time through the cross-sectional morphological relationship, and obtain the elevation change value of the area with morphological mutation under normal river channel evolution;

[0023] The restoration module is used to restore the cross-sectional morphology of the river section area according to the elevation change value of the morphological mutation area under normal river channel evolution.

[0024] In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the first aspect are implemented.

[0025] In a fourth aspect, an embodiment of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0026] In a fifth aspect, an embodiment of the present application provides a chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the method described in the first aspect.

[0027] In a sixth aspect, an embodiment of the present application provides a computer program product, which is stored in a storage medium and is executed by at least one processor to implement the method described in the first aspect.

[0028] In an embodiment of the present application, by obtaining N times of hydrological measured data and topographic measured data of the river section area during the section measurement, wherein the Nth time is the measurement time when the river section undergoes a sudden morphological change, and the 1st to N-1th times are the measurements when the river section presents a natural river section morphology; the hydrological measured data include: water level values, flow rates and sediment content of upstream and downstream monitoring stations; the hydrological measured data and topographic measured data corresponding to the 1st to N-1th times are input into a hydrodynamic-based sediment model to obtain the water level value of the river section during the section measurement; based on the topographic measured data, the average elevation values ​​of multiple sub-areas of the river section area are determined, which can accurately describe the topographic features of the entire section and facilitate subsequent river evolution analysis; the multiple sub-areas include: areas with sudden morphological changes and areas with no sudden morphological changes; based on the average elevation values ​​of the multiple sub-areas, the elevation change values ​​corresponding to each sub-area are calculated respectively. , which can clearly characterize the terrain evolution of each area on the entire section; according to the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the time period when the river section area is flooded are selected from the hydrological measured data; the elevation change value of the morphological mutation area, the elevation change value of the morphological non-mutation area, and the flow and sediment content corresponding to the time period when the river section area is flooded are fitted to obtain the cross-sectional morphological relationship, which can reflect the connection between the change of the river section morphology and the hydrological and water-sediment conditions; through the cross-sectional morphological relationship, the elevation change value of the N-1th morphological non-mutation area, the flow and sediment content after treatment from the N-1th to the Nth time are predicted, and the elevation change value of the morphological mutation area under normal river channel evolution is obtained; according to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river section area is restored. Therefore, according to the elevation change of the morphological mutation area under normal river channel evolution, the overall morphological restoration result of the river section area can be inferred, which is convenient for cross-sectional morphological restoration of the river section area. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of a method for restoring the cross-section morphology of a river provided in an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of a morphological mutation region provided in an embodiment of the present application;

[0031] Figure 3 It is a structural diagram of a river cross-section morphology restoration device provided in an embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the hardware structure of the electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings of the embodiments of the present application to clearly describe the technical solutions of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present application belong to the scope of protection of this application.

[0034] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0035] The river cross-section morphology restoration method provided in the embodiment of the present application can be applied to at least the following application scenarios, which are described below.

[0036] At present, the sudden change of river section is usually caused by the following reasons:

[0037] Human activities, such as artificial sand mining and dumping of material waste, lead to irregular mutations in the river section.

[0038] Sudden disasters: Heavy rains cause landslides and mudslides on both sides of the river, resulting in irregular changes in the cross-sectional morphology of the river. In view of the irregular changes in the cross-sectional morphology of the river caused by negative behaviors such as sand mining and dumping in human activities and sudden disasters, it is necessary to restore the cross-sectional morphology.

[0039] In the prior art, for irregular expansion of cross-sections caused by sand mining, similar soil landfill methods are adopted. For irregular encroachment of cross-sections caused by garbage, waste materials, and geological disasters, they are usually excavated or dredged. However, whether it is landfill or excavation measures, there is no scientific technical control over the control of depth. It is usually operated based on experience or simply making the elevation of the riverbed after regulation consistent with that of the adjacent river section.

[0040] In response to the problems arising in the related art, the embodiments of the present application provide a method, device, electronic device and storage medium for restoring the cross-sectional morphology of a river channel, which can solve the problem in the related art that a method that can effectively restore the cross-sectional morphology of a river channel is urgently needed.

[0041] The river cross-section morphology restoration method provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0042] Figure 1 A flow chart of a method for restoring the cross-section morphology of a river channel provided in an embodiment of the present application.

[0043] like Figure 1 As shown, the river channel cross-section morphology restoration method may include steps 110 to 180, and the method is applied to a river channel cross-section morphology restoration device, as shown below:

[0044] Step 110, obtaining N times of hydrological measured data and topographic measured data of the river section area during the section measurement period, wherein the Nth time is the measurement time when the river section undergoes a sudden change in shape, and the 1st to N-1st times are the measurements when the river section presents a natural river section shape; the hydrological measured data include: water level values, flow and sediment content of upstream and downstream monitoring stations;

[0045] Step 120, inputting the hydrological measured data and topographic measured data corresponding to the 1st to the N-1th times into the sediment model based on hydrodynamics to obtain the water level value of the river section during the section measurement;

[0046] Step 130, determining the average elevation values ​​of multiple sub-regions of the river section region according to the measured terrain data; the multiple sub-regions include: regions with sudden changes in morphology and regions with no sudden changes in morphology;

[0047] Step 140, calculating the elevation change value corresponding to each sub-region according to the average elevation value of the multiple sub-regions;

[0048] Step 150, based on the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the time period when the river section area is flooded are selected from the hydrological measured data;

[0049] Step 160, fitting the elevation change value of the area with sudden morphological changes, the elevation change value of the area with no sudden morphological changes, and the flow and sediment content corresponding to the time period when the river section area is flooded to obtain the cross-sectional morphological relationship;

[0050] Step 170, predicting the elevation change value of the area with no sudden change in shape for the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time through the cross-sectional shape relationship, and obtaining the elevation change value of the area with sudden change in shape under normal river channel evolution;

[0051] Step 180, according to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river channel section area is restored.

[0052] In an embodiment of the present application, by obtaining N times of hydrological measured data and topographic measured data of the river section area during the section measurement, wherein the Nth time is the measurement time when the river section undergoes a sudden morphological change, and the 1st to N-1th times are the measurements when the river section presents a natural river section morphology; the hydrological measured data include: water level values, flow rates and sediment content of upstream and downstream monitoring stations; the hydrological measured data and topographic measured data corresponding to the 1st to N-1th times are input into a hydrodynamic-based sediment model to obtain the water level value of the river section during the section measurement; based on the topographic measured data, the average elevation values ​​of multiple sub-areas of the river section area are determined, which can accurately describe the topographic features of the entire section and facilitate subsequent river evolution analysis; the multiple sub-areas include: areas with sudden morphological changes and areas with no sudden morphological changes; based on the average elevation values ​​of the multiple sub-areas, the elevation change values ​​corresponding to each sub-area are calculated respectively. , which can clearly characterize the terrain evolution of each area on the entire section; according to the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the time period when the river section area is flooded are selected from the hydrological measured data; the elevation change value of the morphological mutation area, the elevation change value of the morphological non-mutation area, and the flow and sediment content corresponding to the time period when the river section area is flooded are fitted to obtain the cross-sectional morphological relationship, which can reflect the connection between the change of the river section morphology and the hydrological and water-sediment conditions; through the cross-sectional morphological relationship, the elevation change value of the N-1th morphological non-mutation area, the flow and sediment content after treatment from the N-1th to the Nth time are predicted, and the elevation change value of the morphological mutation area under normal river channel evolution is obtained; according to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river section area is restored. Therefore, according to the elevation change of the morphological mutation area under normal river channel evolution, the overall morphological restoration result of the river section area can be inferred, which is convenient for cross-sectional morphological restoration of the river section area.

[0053] Steps 110 to 180 are described in sequence below:

[0054] Step 110, obtaining N times of measured hydrological data and measured topographic data of the river section area during the section measurement, wherein the Nth time is the measurement time when the river section undergoes a sudden change in morphology, and the 1st to N-1th times are the measurements when the river section presents the morphology of a natural river section; the measured hydrological data include: water level values, flow and sediment content of upstream and downstream monitoring stations.

[0055] Obtain N times of hydrological and topographic data of the river section area during the section measurement period, that is, N times of hydrological and topographic data collection are carried out on a certain river section during the section measurement period. In these N measurements, the Nth time is the time when the river section undergoes a sudden morphological change. Except for the Nth time, the river section presents a natural morphology in the previous 1 to N-1 measurements.

[0056] These measurements not only measure information about the river section itself, but also include hydrological data such as water level, flow and sediment concentration at upstream and downstream monitoring stations.

[0057] For example, 11 measured topographic data of the river section are obtained, of which the 11th measurement is the measurement when the cross section undergoes a sudden change in shape, and the first 10 measurements are the natural river cross section morphology. The measured topographic map of the representative measurement is as follows: Figure 1 As shown in Figure 1, the measured data of water level W, flow Q, and sediment content S of the upstream and downstream monitoring stations during the 1st to 10th cross-section measurements were obtained.

[0058] Therefore, N hydrological and topographic measurements were conducted on a certain river section. The Nth time, the river section underwent a sudden change in cross-sectional morphology, while the first N-1 times the river sections were in a natural state. At the same time, there were relevant hydrological data from upstream and downstream monitoring stations, which can be used to analyze the laws of river evolution.

[0059] Step 120, inputting the hydrological measured data and topographic measured data corresponding to the 1st to the N-1th times into the sediment model based on hydrodynamics to obtain the water level value of the river section during the section measurement;

[0060] A numerical model based on hydrodynamic principles, called the sediment model, was used to calculate the river water level during the entire cross-section measurement period by inputting the hydrological and topographic data of the previous N-1 times. This simulation process is to make up for the possible missing or incompleteness of the measured data.

[0061] The hydrodynamic model uses the physical laws of water flow to simulate and predict the dynamic behavior of water flow through mathematical equations. This model usually includes continuity equations and momentum equations, and can calculate parameters such as water flow velocity and water level. The hydrodynamic model is used to estimate the water level change process during the entire measurement period based on existing hydrological data.

[0062] The sediment model adds the sediment transport process to the hydrodynamic model and can simulate the sediment transport characteristics in the river. This model usually includes a water flow model and a sediment transport equation, and can calculate parameters such as flow rate and sediment content in the river.

[0063] The hydrodynamic-based sediment model was used in order to combine the hydrological and topographic data and to infer the river channel evolution during the entire measurement period.

[0064] For example, a hydrodynamic-based sediment mathematical model is established for the river in the study area. The first cross-section topographic survey data and the water level, flow rate, and sediment content data of the upstream and downstream monitoring stations during the first to tenth cross-section measurements are input into the model, and the changes in the water level, flow rate, and sediment content of the river section over time during the period are simulated and calculated.

[0065] Step 130, determining the average elevation values ​​of multiple sub-regions of the river section region according to the measured terrain data; the multiple sub-regions include: regions with sudden changes in morphology and regions with no sudden changes in morphology;

[0066] According to the measured terrain data, the average elevation values ​​of multiple sub-areas in the river section area are determined. This means dividing the entire river section into multiple small sub-areas and calculating the average ground elevation of each sub-area. These sub-areas include: areas with sudden changes in morphology and areas with no sudden changes in morphology.

[0067] The morphological mutation area refers to the area where the morphological mutation occurred during the Nth measurement. The morphological non-mutation area refers to other areas where the morphological changes did not occur. By determining the average elevation of these sub-areas, the topographic characteristics of the river section can be described more precisely.

[0068] like Figure 2 As shown, the cross section is used as a representative for zoning, and there are 7 areas in total according to the terrain changes, among which Area 3 and Area 4 are areas of morphological mutation.

[0069] Therefore, the water level changes during the entire measurement period were simulated using a hydrodynamic model, and then the sections were subdivided according to the topographic survey data and the average elevation of each area was calculated, providing basic data for subsequent river evolution analysis.

[0070] In a possible embodiment, step 130 includes:

[0071] The river section area is divided into multiple sub-areas according to the measured terrain data;

[0072] According to the measured terrain data, determine the terrain elevation points contained in each sub-area;

[0073] For each sub-region, the elevation values ​​corresponding to the terrain elevation points are averaged to obtain the average elevation value of the sub-region.

[0074] The average elevation value refers to the average value of the ground elevation in a certain area.

[0075] The river section area is divided into multiple sub-areas according to the measured terrain data, which means that the entire river section is divided into multiple smaller sub-areas. The sub-areas can be divided according to the terrain characteristics, such as ups and downs, cross-section changes, etc., so as to describe the terrain conditions of the entire section in more detail.

[0076] In each sub-area, there are multiple topographic measuring points that record the specific elevation values ​​of the ground in the area. The elevation data of these measuring points constitute the actual topographic data of the sub-area.

[0077] For each sub-area, the elevation values ​​of all the measuring points within it are averaged to obtain the representative elevation value of the sub-area, that is, the average elevation value. The average elevation value can better reflect the terrain characteristics of the entire sub-area rather than the local situation of a single measuring point.

[0078] Therefore, by dividing the entire river section into multiple sub-areas and calculating the average elevation value of each sub-area, the terrain characteristics of the entire section can be described more finely, which facilitates subsequent river evolution analysis.

[0079] Step 140, calculating the elevation change value corresponding to each sub-region according to the average elevation value of the multiple sub-regions;

[0080] Compare the average elevation values ​​of the same sub-area in two consecutive measurements to obtain the elevation change of the sub-area between the two measurements. According to the difference between the average elevation values ​​of the same sub-area in two consecutive measurements, the actual elevation change value of the sub-area during this period can be obtained.

[0081] For example, by subtracting the average elevations of each area in the 10 cross-sectional measurement data, 9 elevation change values ​​for each area can be obtained. The elevation change value corresponding to each sub-area includes: the difference between the average elevation of the first measurement and the average elevation of the second measurement, the difference between the average elevation of the second measurement and the average elevation of the third measurement, and so on.

[0082] Thus, the specific elevation change value of each sub-area during the measurement period can be obtained, which is convenient for determining which sub-areas have undergone obvious elevation changes and for understanding the terrain evolution of each area on the entire section.

[0083] In a possible embodiment, step 140 includes:

[0084] For each sub-area, the difference between the average elevation value of the first measurement and the average elevation value of the N-1th measurement is determined as the elevation change value to obtain N-2 elevation change values.

[0085] Assuming there are N measurements, there are N-1 time intervals. For each sub-area, subtract the average elevation value of the first measurement from the average elevation value of the N-1th measurement to obtain the elevation change value of the sub-area in this time interval. N-2 elevation change values ​​can be obtained because the corresponding elevation changes cannot be calculated for the first and Nth measurements.

[0086] Thus, the elevation change values ​​of each sub-area between two adjacent measurements were obtained, with a total of N-2 values. These data can be used to analyze the topographic evolution of the entire river section during the measurement period.

[0087] Step 150, based on the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the time period when the river section area is flooded are selected from the hydrological measured data;

[0088] In a possible embodiment, step 150 includes:

[0089] According to the average elevation value of each sub-area and the water level value of the river section, the time period when the river section area is flooded is selected from the hydrological measured data;

[0090] Based on the measured hydrological data, determine the flow and sediment content corresponding to the time period when the river section area is flooded.

[0091] According to the average elevation value of each sub-area and the water level value of the river section, the time period when the river section area is flooded is screened out from the hydrological measured data. For each sub-area, its average elevation value and the water level value at that time are compared. If the water level is higher than the average elevation value of the sub-area, it means that the sub-area is flooded. The time period when each sub-area is flooded is recorded.

[0092] For the previously screened flooded time periods, find the flow and sediment content data for this time period in the hydrological measured data, and record the flow and sediment content information corresponding to each flooded time period.

[0093] For example, based on the regional average elevation and water level calculation results, the period when the area was flooded during the 1st to 10th section measurements was determined, and the section flow and sediment content during the period when the area was flooded were screened out and averaged and normalized. The water level change of the representative section was 220-230m, so all areas were flooded and there was no need to exclude the flow and sediment content values.

[0094] Thus, the specific time period when each sub-area was flooded, as well as the flow and sediment content data corresponding to each flooded time period, can be obtained.

[0095] Step 160, fitting the elevation change value of the area with sudden morphological changes, the elevation change value of the area with no sudden morphological changes, and the flow and sediment content corresponding to the time period when the river section area is flooded to obtain the cross-sectional morphological relationship;

[0096] A fitting analysis is performed on the elevation change values ​​of the morphological mutation area. According to the elevation change values ​​of the morphological mutation area calculated previously, an attempt is made to fit these elevation change values ​​using a suitable fitting function to obtain a fitting model for the elevation change of the morphological mutation area.

[0097] A fitting analysis is performed on the elevation change values ​​of the area without a sudden change in morphology. Similarly, based on the elevation change values ​​of the area without a sudden change in morphology calculated previously, a suitable fitting function is selected to fit these elevation change values ​​to obtain a fitting model for the elevation change of the area without a sudden change in morphology.

[0098] Using the flow and sediment content data corresponding to the flooded time period screened out previously, the relationship between flow and sediment content is fitted through a suitable fitting function to obtain a flow-sediment content fitting model.

[0099] Combining the above three fitting models, a relationship model between cross-section morphology and water and sediment conditions is established:

[0100] Thus, the cross-sectional morphological relationship can be obtained, which can reflect the connection between the changes in the cross-sectional morphology of the river channel and the hydrological and water-sediment conditions.

[0101] In a possible embodiment, step 160 includes:

[0102] The flow and sediment content corresponding to the time period when the river section area is flooded are normalized to obtain the normalized flow and sediment content;

[0103] For any area with a morphological mutation, the elevation change value of the area with a morphological mutation, the elevation change value of the area with no morphological mutation, the normalized flow rate and sediment content are fitted to obtain the cross-sectional morphological relationship, where the cross-sectional morphological relationship is the relationship between the elevation change value of the area with a morphological mutation and the flow rate, sediment content and elevation change value of the area with no morphological mutation.

[0104] The flow and sediment content corresponding to the time period when the river section area is flooded are normalized, that is, the maximum and minimum values ​​of the flow and sediment content data are found, and the flow and sediment content data are normalized using a linear normalization formula to obtain the normalized flow and sediment content data.

[0105] For any morphological mutation region, perform the following analysis:

[0106] Get the elevation change value of the area with a sudden change in morphology, get the elevation change value of the area with no sudden change in morphology, use the normalized flow and sediment content data obtained above, try to use a suitable fitting function to fit the following three variables: the elevation change value of the area with a sudden change in morphology, the elevation change value of the area with no sudden change in morphology, and the normalized flow and sediment content, and get the cross-sectional morphological relationship.

[0107] The cross-sectional morphological relationship can be:

[0108] The elevation change value of the area with sudden morphological changes = f(normalized flow, normalized sediment content, elevation change value of the area with no sudden morphological changes), where f() is the function relationship obtained by fitting.

[0109] Thus, a comprehensive model describing the relationship between cross-sectional morphology and water and sediment conditions can be obtained. This model can reflect the relationship between the elevation change in the area with a sudden change in morphology and the normalized flow and sediment content as well as the elevation change in the area with no sudden change in morphology.

[0110] Among them, the step of fitting the elevation change value of the morphological mutation area, the elevation change value of the morphological non-mutated area, and the flow and sediment content corresponding to the time period when the river section area is flooded to obtain the cross-sectional morphological relationship may specifically include the following steps:

[0111] Establishing a cross-sectional shape relationship to be solved, the coefficients to be solved in the cross-sectional shape relationship to be solved include: flow weight coefficient, sediment content weight coefficient and elevation weight coefficient;

[0112] Calculate the weighted flow value according to the flow weight coefficient and the normalized flow;

[0113] Calculate the weighted sediment content according to the sediment content weight coefficient and the normalized sediment content;

[0114] Determine the weighted elevation value of each non-mutation area according to the elevation weight coefficient of each non-mutation area and the elevation change value of the non-mutation area;

[0115] According to the weighted flow value, weighted sediment content, weighted elevation value and the elevation change value of the morphological mutation area, the coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient and the coefficient value of the elevation weight coefficient are solved;

[0116] According to the coefficient values ​​of the flow weight coefficient, the coefficient values ​​of the sediment content weight coefficient and the coefficient values ​​of the elevation weight coefficient, the cross-sectional morphological relationship between the elevation change values ​​of the morphological mutation area and the flow, sediment content and elevation change values ​​of the non-mutated area is established.

[0117] Establishing a cross-sectional shape relationship to be solved, the coefficients to be solved in the cross-sectional shape relationship to be solved include: flow weight coefficient, sediment content weight coefficient and elevation weight coefficient;

[0118] Based on the N-2 elevation change values ​​and the normalized flow and sediment content, multivariate fitting is performed to obtain the relationship:

[0119]

[0120] Among them, α and β are weight coefficients. α1 is the weight coefficient of sediment content, α2 is the weight coefficient of flow, and α b , αc , …, α m-2 is the elevation weight coefficient of each non-mutation area, and m is used to identify the non-mutation area.

[0121] △y b ,…,△y m-2 is the elevation change value associated with each non-mutated area.

[0122] For example, N is 11, N-2 is 9, so 9 sets of elevation change values ​​and normalized flow and sediment content are substituted into the relationship to fit various parameters, including:

[0123] Calculate the weighted flow value according to the flow weight coefficient and the normalized flow;

[0124] Calculate the weighted sediment content according to the sediment content weight coefficient and the normalized sediment content;

[0125] Determine the weighted elevation value of each non-mutation area according to the elevation weight coefficient of each non-mutation area and the elevation change value of the non-mutation area;

[0126] According to the weighted flow value, weighted sediment content, weighted elevation value and the elevation change value of the morphological mutation area, the coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient and the coefficient value of the elevation weight coefficient are solved;

[0127] According to the coefficient values ​​of the flow weight coefficient, the coefficient values ​​of the sediment content weight coefficient and the coefficient values ​​of the elevation weight coefficient, the cross-sectional morphological relationship between the elevation change values ​​of the morphological mutation area and the flow, sediment content and elevation change values ​​of the non-mutated area is established.

[0128] By analogy, the elevation change relationship of all morphological mutation areas of the section can be obtained.

[0129] The normalized flow, sediment content, and elevation changes of each region used to fit the relationship are shown in Table 1:

[0130] Table 1

[0131]

[0132] Based on the multivariate fitting of 9 elevation change values ​​and normalized flow and sediment content, the relationship between the morphological mutation area 3 is obtained as follows:

[0133]

[0134] Step 170, predicting the elevation change value of the area with no sudden change in shape for the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time through the cross-sectional shape relationship, and obtaining the elevation change value of the area with sudden change in shape under normal river channel evolution;

[0135] In a possible embodiment, step 170 includes:

[0136] The coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient, the flow after treatment from the N-1th to the Nth time, the sediment content after treatment from the N-1th to the Nth time, the coefficient value of the elevation weight coefficient, and the elevation change value of the N-1th morphologically unchanged area are weightedly calculated to obtain the elevation change value of the morphologically mutant area under normal river channel evolution.

[0137] Specifically, the elevation change values ​​of the area where the morphology did not change suddenly in the 11th time and the flow and sediment content after treatment from the 10th to the 11th time were substituted into the right side of the cross-sectional morphological relationship, and the elevation change values ​​of the area where the morphology changed suddenly under normal river channel evolution were calculated to be ∆y3=0.47 and ∆y4=0.55.

[0138] After conversion according to the normalized formula, the actual changes in elevation of Area 3 and Area 4 are -1.35m and -1.20m respectively. Therefore, the elevation that should be backfilled is the elevation that is reduced by 1.35m and 1.20m based on the terrain measured in the 10th time. In actual operation, backfilling work is carried out based on the current 11th terrain.

[0139] Therefore, backfill and remediation projects can be carried out in areas 3 and 4 in the section, and finally a stable section morphology can be obtained whose morphological changes conform to the laws of natural scouring and silting.

[0140] Step 180, according to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river channel section area is restored.

[0141] Substitute the elevation change values ​​calculated in the above steps and the elevation change values ​​of the area where the morphology has not changed suddenly into the cross-sectional morphological relationship established previously to solve the corresponding normalized flow and normalized sediment content.

[0142] By normalizing the flow and normalized sediment content, the actual flow and sediment content are reversed and restored. Through inverse normalization calculation, the normalized values ​​are converted back to the original flow and sediment content data. The restored flow and sediment content data are comprehensively utilized, combined with the previously established cross-sectional morphology relationship model, to calculate the morphology of the river cross-sectional area. The restored flow and sediment content data are substituted into the model to infer the elevation changes of each sub-area in the river cross-sectional area, thereby completing the morphological restoration of the river cross-sectional area.

[0143] Therefore, the overall morphological restoration result of the river section area can be inferred based on the elevation changes in the morphological mutation area under normal river channel evolution.

[0144] In an embodiment of the present application, by obtaining N times of hydrological measured data and topographic measured data of the river section area during the section measurement, wherein the Nth time is the measurement time when the river section undergoes a sudden morphological change, and the 1st to N-1th times are the measurements when the river section presents a natural river section morphology; the hydrological measured data include: water level values, flow rates and sediment content of upstream and downstream monitoring stations; the hydrological measured data and topographic measured data corresponding to the 1st to N-1th times are input into a hydrodynamic-based sediment model to obtain the water level value of the river section during the section measurement; based on the topographic measured data, the average elevation values ​​of multiple sub-areas of the river section area are determined, which can accurately describe the topographic features of the entire section and facilitate subsequent river evolution analysis; the multiple sub-areas include: areas with sudden morphological changes and areas with no sudden morphological changes; based on the average elevation values ​​of the multiple sub-areas, the elevation change values ​​corresponding to each sub-area are calculated respectively. , which can clearly characterize the terrain evolution of each area on the entire section; according to the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the time period when the river section area is flooded are selected from the hydrological measured data; the elevation change value of the morphological mutation area, the elevation change value of the morphological non-mutation area, and the flow and sediment content corresponding to the time period when the river section area is flooded are fitted to obtain the cross-sectional morphological relationship, which can reflect the connection between the change of the river section morphology and the hydrological and water-sediment conditions; through the cross-sectional morphological relationship, the elevation change value of the N-1th morphological non-mutation area, the flow and sediment content after treatment from the N-1th to the Nth time are predicted, and the elevation change value of the morphological mutation area under normal river channel evolution is obtained; according to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river section area is restored. Therefore, according to the elevation change of the morphological mutation area under normal river channel evolution, the overall morphological restoration result of the river section area can be inferred, which is convenient for cross-sectional morphological restoration of the river section area.

[0145] The river channel cross-section morphology restoration method provided in the embodiment of the present application can be executed by a river channel cross-section morphology restoration device. In the embodiment of the present application, the river channel cross-section morphology restoration method performed by the river channel cross-section morphology restoration device is taken as an example to illustrate the river channel cross-section morphology restoration device provided in the embodiment of the present application.

[0146] Figure 3 300 is a block diagram of a river cross-section morphology restoration device provided in an embodiment of the present application. The device 300 includes:

[0147] The acquisition module 310 is used to obtain N times of hydrological and topographic measured data of the river section area during the section measurement period, wherein the Nth time is the measurement time when the river section undergoes a sudden change in shape, and the 1st to N-1st times are the measurements when the river section presents the natural river section shape; the hydrological measured data include: water level values, flow and sediment content of upstream and downstream monitoring stations;

[0148] An input module 320 is used to input the hydrological measured data and topographic measured data corresponding to the 1st to the N-1th times into a sediment model based on hydrodynamics to obtain the water level value of the river section during the section measurement;

[0149] The determination module 330 is used to determine the average elevation values ​​of multiple sub-regions of the river section area according to the measured terrain data; the multiple sub-regions include: areas with sudden changes in morphology and areas with no sudden changes in morphology;

[0150] A calculation module 340 is used to calculate the elevation change value corresponding to each sub-area according to the average elevation value of the multiple sub-areas;

[0151] A screening module 350 is used to screen the flow and sediment content corresponding to the flooded time period of the river section area from the hydrological measured data according to the average elevation value of each sub-area and the water level value of the river section;

[0152] The fitting module 360 ​​is used to fit the elevation change value of the area with sudden morphological changes, the elevation change value of the area with no sudden morphological changes, and the flow and sediment content corresponding to the time period when the river section area is flooded, so as to obtain the cross-sectional morphological relationship;

[0153] Prediction module 370, used to predict the elevation change value of the area without sudden change in shape for the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time through the cross-sectional shape relationship, and obtain the elevation change value of the area with sudden change in shape under normal river channel evolution;

[0154] The restoration module 380 is used to restore the cross-sectional morphology of the river channel section area according to the elevation change value of the morphological mutation area under normal river channel evolution.

[0155] In a possible embodiment, the determination module 330 is specifically configured to:

[0156] The river section area is divided into multiple sub-areas according to the measured terrain data;

[0157] According to the measured terrain data, determine the terrain elevation points contained in each sub-area;

[0158] For each sub-region, the elevation values ​​corresponding to the terrain elevation points are averaged to obtain the average elevation value of the sub-region.

[0159] In a possible embodiment, the calculation module 340 is specifically configured to:

[0160] For each sub-area, the difference between the average elevation value of the first measurement and the average elevation value of the N-1th measurement is determined as the elevation change value to obtain N-2 elevation change values.

[0161] In a possible embodiment, the screening module 350 is specifically used to:

[0162] According to the average elevation value of each sub-area and the water level value of the river section, the time period when the river section area is flooded is selected from the hydrological measured data;

[0163] Based on the measured hydrological data, determine the flow and sediment content corresponding to the time period when the river section area is flooded.

[0164] In a possible embodiment, the fitting module 360 ​​is specifically configured to:

[0165] The flow and sediment content corresponding to the time period when the river section area is flooded are normalized to obtain the normalized flow and sediment content;

[0166] For any area with a morphological mutation, the elevation change value of the area with a morphological mutation, the elevation change value of the area with no morphological mutation, the normalized flow rate and sediment content are fitted to obtain the cross-sectional morphological relationship, where the cross-sectional morphological relationship is the relationship between the elevation change value of the area with a morphological mutation and the flow rate, sediment content and elevation change value of the area with no morphological mutation.

[0167] In a possible embodiment, the fitting module 360 ​​is specifically configured to:

[0168] Establishing a cross-sectional shape relationship to be solved, the coefficients to be solved in the cross-sectional shape relationship to be solved include: flow weight coefficient, sediment content weight coefficient and elevation weight coefficient;

[0169] Calculate the weighted flow value according to the flow weight coefficient and the normalized flow;

[0170] Calculate the weighted sediment content according to the sediment content weight coefficient and the normalized sediment content;

[0171] Determine the weighted elevation value of each non-mutation area according to the elevation weight coefficient of each non-mutation area and the elevation change value of the non-mutation area;

[0172] According to the weighted flow value, weighted sediment content, weighted elevation value and the elevation change value of the morphological mutation area, the coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient and the coefficient value of the elevation weight coefficient are solved;

[0173] According to the coefficient values ​​of the flow weight coefficient, the coefficient values ​​of the sediment content weight coefficient and the coefficient values ​​of the elevation weight coefficient, the cross-sectional morphological relationship between the elevation change values ​​of the morphological mutation area and the flow, sediment content and elevation change values ​​of the non-mutated area is established.

[0174] In a possible embodiment, the prediction module 370 is specifically configured to:

[0175] The coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient, the flow after treatment from the N-1th to the Nth time, the sediment content after treatment from the N-1th to the Nth time, the coefficient value of the elevation weight coefficient, and the elevation change value of the N-1th morphologically unchanged area are weightedly calculated to obtain the elevation change value of the morphologically mutant area under normal river channel evolution.

[0176] In an embodiment of the present application, by obtaining N times of hydrological measured data and topographic measured data of the river section area during the section measurement, wherein the Nth time is the measurement time when the river section undergoes a sudden morphological change, and the 1st to N-1th times are the measurements when the river section presents a natural river section morphology; the hydrological measured data include: water level values, flow rates and sediment content of upstream and downstream monitoring stations; the hydrological measured data and topographic measured data corresponding to the 1st to N-1th times are input into a hydrodynamic-based sediment model to obtain the water level value of the river section during the section measurement; based on the topographic measured data, the average elevation values ​​of multiple sub-areas of the river section area are determined, which can accurately describe the topographic features of the entire section and facilitate subsequent river evolution analysis; the multiple sub-areas include: areas with sudden morphological changes and areas with no sudden morphological changes; based on the average elevation values ​​of the multiple sub-areas, the elevation change values ​​corresponding to each sub-area are calculated respectively. , which can clearly characterize the terrain evolution of each area on the entire section; according to the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the time period when the river section area is flooded are selected from the hydrological measured data; the elevation change value of the morphological mutation area, the elevation change value of the morphological non-mutation area, and the flow and sediment content corresponding to the time period when the river section area is flooded are fitted to obtain the cross-sectional morphological relationship, which can reflect the connection between the change of the river section morphology and the hydrological and water-sediment conditions; through the cross-sectional morphological relationship, the elevation change value of the N-1th morphological non-mutation area, the flow and sediment content after treatment from the N-1th to the Nth time are predicted, and the elevation change value of the morphological mutation area under normal river channel evolution is obtained; according to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river section area is restored. Therefore, according to the elevation change of the morphological mutation area under normal river channel evolution, the overall morphological restoration result of the river section area can be inferred, which is convenient for cross-sectional morphological restoration of the river section area.

[0177] The river cross-section morphology restoration device provided in the embodiment of the present application can implement each process implemented in the above-mentioned method embodiment. To avoid repetition, it will not be repeated here.

[0178] Optionally, Figure 4 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application is shown.

[0179] The electronic device may include a processor 401 and a memory 402 storing computer program instructions.

[0180] Specifically, the processor 401 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0181] The memory 402 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 402 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory 402 may include a removable or non-removable (or fixed) medium. Where appropriate, the memory 402 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 402 is a non-volatile solid-state memory. In a specific embodiment, the memory 402 includes a read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0182] The processor 401 reads and executes the computer program instructions stored in the memory 402 to implement any one of the river section morphology restoration methods in the embodiments shown in the figure.

[0183] In one example, the electronic device may further include a communication interface 404 and a bus 410. Figure 4 As shown, the processor 401, the memory 402, and the communication interface 404 are connected via a bus 410 and communicate with each other.

[0184] The communication interface 404 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0185] Bus 410 includes hardware, software or both, and couples the components of the electronic device to each other. For example, but not limitation, the bus may include an accelerated graphics port (AGP) or other graphics bus, an enhanced industrial standard architecture (EISA) bus, a front-side bus (FSB), a hypertransport (HT) interconnect, an industrial standard architecture (ISA) bus, an infinite bandwidth interconnect, a low pin count (LPC) bus, a memory bus, a microchannel architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standard association local (VLB) bus or other suitable bus or a combination of two or more of these. Where appropriate, bus 410 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the present application considers any suitable bus or interconnect.

[0186] The electronic device can execute the river section morphology restoration method in the embodiment of the present application, thereby realizing the combination Figure 2 Described is a method for restoring the river section morphology.

[0187] In addition, in combination with the river cross-section morphology restoration method in the above embodiment, the present application embodiment can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor, the Figure 1 A method for restoring river cross-section morphology.

[0188] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0189] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0190] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0191] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A method for restoring the cross-section morphology of a river channel, characterized in that: The method comprises: Obtain N times of hydrological and topographical measured data of the river section area during the section measurement period, wherein the Nth time is the measurement time when the river section undergoes a sudden change in shape, and the 1st to N-1st times are the measurements when the river section presents the shape of a natural river section; the hydrological measured data include: water level values, flow and sediment content of upstream and downstream monitoring stations; the topographical measured data include: measured topographic map of the section; Input the hydrological and topographic measured data corresponding to the 1st to the N-1th times into the sediment model based on hydrodynamics to obtain the water level value of the river section during the section measurement; According to the measured terrain data, the average elevation values ​​of multiple sub-areas of the river section area are determined; the multiple sub-areas include: areas with sudden changes in morphology and areas with no sudden changes in morphology; According to the average elevation values ​​of multiple sub-areas, the elevation change value corresponding to each sub-area is calculated respectively; According to the average elevation value of each sub-area and the water level value of the river section, the flow and sediment content corresponding to the period of time when the river section area was flooded were screened from the hydrological measured data; Fit the elevation change values ​​of the area with sudden morphological changes, the elevation change values ​​of the area with no sudden morphological changes, and the flow and sediment content corresponding to the time period when the river section area was flooded to obtain the cross-sectional morphological relationship; Through the cross-sectional morphological relationship, the elevation change value of the area without morphological mutation at the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time are predicted, and the elevation change value of the area with morphological mutation under normal river channel evolution is obtained; According to the elevation change value of the morphological mutation area under normal river channel evolution, the cross-sectional morphology of the river channel section is restored; The cross-sectional morphological relationship is obtained by fitting the elevation change value of the morphological mutation area, the elevation change value of the morphological non-mutated area, and the flow and sediment content corresponding to the time period when the river section area is flooded, including: The flow and sediment content corresponding to the time period when the river section area is flooded are normalized to obtain the normalized flow and sediment content; For any area with a morphological mutation, the elevation change value of the area with a morphological mutation, the elevation change value of the area with no morphological mutation, the normalized flow rate and sediment content are fitted to obtain the cross-sectional morphological relationship, where the cross-sectional morphological relationship is the relationship between the elevation change value of the area with a morphological mutation and the flow rate, sediment content and elevation change value of the area with no morphological mutation.

2. The method according to claim 1, characterized in that Determining the average elevation values ​​of multiple sub-areas of the river section area according to the measured terrain data includes: The river section area is divided into multiple sub-areas according to the measured terrain data; According to the measured terrain data, determine the terrain elevation points contained in each sub-area; For each sub-region, the elevation values ​​corresponding to the terrain elevation points are averaged to obtain the average elevation value of the sub-region.

3. The method according to claim 1, characterized in that The step of calculating the elevation change value corresponding to each sub-region according to the average elevation value of the multiple sub-regions includes: For each sub-area, the difference between the average elevation value of the first measurement and the average elevation value of the N-1th measurement is determined as the elevation change value to obtain N-2 elevation change values.

4. The method according to claim 1, characterized in that: The method of selecting the flow and sediment content corresponding to the flooded time period of the river section area from the hydrological measured data according to the average elevation value and the river section water level value of each sub-area includes: According to the average elevation value of each sub-area and the water level value of the river section, the time period when the river section area is flooded is selected from the hydrological measured data; Based on the measured hydrological data, determine the flow and sediment content corresponding to the time period when the river section area is flooded.

5. The method according to claim 1, characterized in that The cross-sectional morphological relationship is obtained by fitting the elevation change value of the morphological mutation area, the elevation change value of the morphological non-mutated area, and the flow and sediment content corresponding to the time period when the river section area is flooded, including: Establishing a cross-sectional shape relationship to be solved, the coefficients to be solved in the cross-sectional shape relationship to be solved include: flow weight coefficient, sediment content weight coefficient and elevation weight coefficient; Calculate the weighted flow value according to the flow weight coefficient and the normalized flow; Calculate the weighted sediment content according to the sediment content weight coefficient and the normalized sediment content; Determine the weighted elevation value of each non-mutation area according to the elevation weight coefficient of each non-mutation area and the elevation change value of the non-mutation area; According to the weighted flow value, weighted sediment content, weighted elevation value and the elevation change value of the morphological mutation area, the coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient and the coefficient value of the elevation weight coefficient are solved; According to the coefficient values ​​of the flow weight coefficient, the coefficient values ​​of the sediment content weight coefficient and the coefficient values ​​of the elevation weight coefficient, the cross-sectional morphological relationship between the elevation change values ​​of the morphological mutation area and the flow, sediment content and elevation change values ​​of the non-mutated area is established.

6. The method according to claim 5, characterized in that The elevation change value of the area without morphological mutation for the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time are predicted through the cross-sectional morphological relationship, and the elevation change value of the area with morphological mutation under normal river channel evolution is obtained, including: The coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient, the flow after treatment from the N-1th to the Nth time, the sediment content after treatment from the N-1th to the Nth time, the coefficient value of the elevation weight coefficient, and the elevation change value of the N-1th morphologically unchanged area are weightedly calculated to obtain the elevation change value of the morphologically mutant area under normal river channel evolution.

7. A device for restoring the cross-section of a river, characterized in that: The device comprises: The acquisition module is used to obtain N times of hydrological and topographic measured data of the river section area during the section measurement period, wherein the Nth time is the measurement time when the river section undergoes a sudden change in shape, and the 1st to N-1st times are the measurements when the river section presents the natural river section shape; the hydrological measured data include: water level values, flow and sediment content of upstream and downstream monitoring stations; the topographic measured data include: measured topographic map of the section; An input module is used to input the hydrological measured data and topographic measured data corresponding to the 1st to the N-1th time into the sediment model based on hydrodynamics to obtain the water level value of the river section during the section measurement; The determination module is used to determine the average elevation values ​​of multiple sub-areas of the river section area according to the measured terrain data; the multiple sub-areas include: areas with sudden changes in morphology and areas with no sudden changes in morphology; A calculation module is used to calculate the elevation change value corresponding to each sub-area according to the average elevation value of the multiple sub-areas; A screening module is used to screen the flow and sediment content corresponding to the flooded time period of the river section area from the hydrological measured data according to the average elevation value of each sub-area and the water level value of the river section; The fitting module is used to fit the elevation change value of the area with sudden morphological changes, the elevation change value of the area with no sudden morphological changes, and the flow and sediment content corresponding to the time period when the river section area is flooded, so as to obtain the cross-sectional morphological relationship; The prediction module is used to predict the elevation change value of the area with no morphological mutation at the N-1th time, the flow and sediment content after treatment from the N-1th time to the Nth time through the cross-sectional morphological relationship, and obtain the elevation change value of the area with morphological mutation under normal river channel evolution; The restoration module is used to restore the cross-sectional morphology of the river section area according to the elevation change value of the morphological mutation area under normal river channel evolution; Fitting module, specifically used for: The flow and sediment content corresponding to the time period when the river section area is flooded are normalized to obtain the normalized flow and sediment content; For any area with a morphological mutation, the elevation change value of the area with a morphological mutation, the elevation change value of the area with no morphological mutation, the normalized flow rate and sediment content are fitted to obtain the cross-sectional morphological relationship, where the cross-sectional morphological relationship is the relationship between the elevation change value of the area with a morphological mutation and the flow rate, sediment content and elevation change value of the area with no morphological mutation.

8. The device according to claim 7, characterized in that Identify modules, specifically for: The river section area is divided into multiple sub-areas according to the measured terrain data; According to the measured terrain data, determine the terrain elevation points contained in each sub-area; For each sub-region, the elevation values ​​corresponding to the terrain elevation points are averaged to obtain the average elevation value of the sub-region.

9. The device according to claim 7, characterized in that Computing module, specifically used for: For each sub-area, the difference between the average elevation value of the first measurement and the average elevation value of the N-1th measurement is determined as the elevation change value to obtain N-2 elevation change values.

10. The device according to claim 7, characterized in that Screening module, specifically used for: According to the average elevation value of each sub-area and the water level value of the river section, the time period when the river section area is flooded is selected from the hydrological measured data; Based on the measured hydrological data, determine the flow and sediment content corresponding to the time period when the river section area is flooded.

11. The device according to claim 7, characterized in that Fitting module, specifically used for: Establishing a cross-sectional shape relationship to be solved, the coefficients to be solved in the cross-sectional shape relationship to be solved include: flow weight coefficient, sediment content weight coefficient and elevation weight coefficient; Calculate the weighted flow value according to the flow weight coefficient and the normalized flow; Calculate the weighted sediment content according to the sediment content weight coefficient and the normalized sediment content; Determine the weighted elevation value of each non-mutation area according to the elevation weight coefficient of each non-mutation area and the elevation change value of the non-mutation area; According to the weighted flow value, weighted sediment content, weighted elevation value and the elevation change value of the morphological mutation area, the coefficient value of the flow weight coefficient, the coefficient value of the sediment content weight coefficient and the coefficient value of the elevation weight coefficient are solved; According to the coefficient values ​​of the flow weight coefficient, the coefficient values ​​of the sediment content weight coefficient and the coefficient values ​​of the elevation weight coefficient, the cross-sectional morphological relationship between the elevation change values ​​of the morphological mutation area and the flow, sediment content and elevation change values ​​of the non-mutated area is established.

12. An electronic device, characterized in that: The electronic device comprises: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the method for restoring the river section morphology as claimed in any one of claims 1 to 6 is implemented.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the method for restoring the river section morphology as described in any one of claims 1 to 6 is implemented.

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