A method and system for county-level basin management unit division

Abstract

A kind of method for county-level basin management unit division, comprising: obtaining county-level basin management unit division basic data;According to the division basic data obtained, the catchment relationship is clarified, the natural basin unit and artificial basin unit are divided respectively, the natural basin unit and artificial basin unit are merged and optimized, and the preliminary county-level basin management unit result is obtained;The integrity and rationality of the preliminary county-level basin management unit result are checked, and the county-level basin management unit result that passes the check is output and displayed.The present application solves the problem that it is difficult to divide the basin management unit in the county-level study area to some extent by combining the natural watershed divide and artificial watershed divide;The present application corrects the basin management unit using administrative boundary, forms a set of technical methods for county-level basin management unit division, and enhances the integrity and scientificity of county-level basin management unit.

Description

Technical Field

[0001] This invention relates to the field of integrated watershed management technology, specifically to a method and system for dividing county-level watershed management units. Background Technology

[0002] In hydrology, a watershed refers to a closed topographic unit, which is the catchment area of ​​rivers or lakes enclosed by a watershed. Traditional watershed unit delineation is mainly based on digital elevation models (DEMs) or topographic map data, using hydrological analysis tools, combined with hydrological data and water resource zoning data to determine natural watersheds and generate hydrological units. Secondly, based on hydrological units, control sections, river system maps, and other data are overlaid, and catchment units are identified through runoff analysis. Finally, the generated catchment units are checked, adjusted, and merged to form the final watershed unit.

[0003] Unlike traditional watershed units, watershed management units are spatial governance units delineated based on the identification of catchment units and the administrative authority. They represent a secondary spatial control area at the county level, situated between the county-level and small watershed boundaries, coordinating resource protection and utilization with urban and rural development within the watershed to achieve a balance between high-level protection and high-quality development. According to the Ministry of Water Resources' "Small Watershed Classification and Coding Standards," a small watershed is generally defined as one with an area not exceeding 50 km². 2 The catchment area of ​​a county-level watershed management unit is defined as 100 km², while a county-level watershed management unit consists of at least two smaller watershed units. 2 .

[0004] In terms of watershed management unit delineation methods, existing technologies are mostly based on software that automatically extracts watershed units after hydrological analysis using DEM or topographic map data. These methods mainly focus on the impact of natural watersheds such as natural catchment relationships and topographic slopes on watershed unit delineation. However, there is no unified standard method for delineating watershed management units. Especially in plain areas lacking natural watersheds, the zoning of watershed management units is not effective and cannot effectively achieve the overall planning of development and protection within watershed units. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a method and system for dividing county-level watershed management units to overcome or at least partially solve the above problems.

[0006] To address the aforementioned technical problems, the embodiments of this application disclose the following technical solutions:

[0007] In a first aspect, embodiments of the present invention disclose a method for dividing county-level watershed management units, including:

[0008] S100. Obtain basic data for the division of county-level watershed management units;

[0009] S200. Based on the obtained basic data for division, clarify the water catchment relationships, divide the natural watershed units and artificial watershed units respectively, merge and optimize the natural watershed units and artificial watershed units, and obtain preliminary county-level watershed management unit results;

[0010] S300. Check the completeness and rationality of the preliminary county-level watershed management unit results, and output and display the county-level watershed management unit results that have passed the check.

[0011] Furthermore, in S200, the water catchment relationship is clarified based on the acquired basic data of the division. The specific method includes: obtaining the confluence direction and water flow direction of the water system based on the acquired water system-related data, and obtaining the water catchment relationship based on the confluence direction and water flow direction.

[0012] Furthermore, in S200, the natural watershed units are divided based on the acquired basic data for division. The specific methods include: performing hydrological analysis using topographic data, extracting natural watersheds, and using the natural watersheds to divide the natural watershed units.

[0013] Furthermore, in S200, based on the acquired basic data for division, the artificial watershed units are divided. The specific method includes: based on the acquired vector data of county-level transportation network, dikes, irrigation areas, and flood storage areas, the main transportation arteries with physical roadbeds such as highways, national highways, provincial highways, and railways, as well as dikes, irrigation areas, and flood storage areas, are converted into single-line layers. The various line layers are connected, and the gaps between the line layers are divided and connected according to the actual terrain to divide the artificial watershed units.

[0014] Furthermore, in S200, the natural watershed units and artificial watershed units are merged and optimized to obtain preliminary county-level watershed management unit results. The specific method includes: based on the divided natural watershed units and artificial watershed units in hilly and mountainous terrain areas, natural watershed units in hilly and mountainous terrain areas and artificial watershed units in plain terrain areas are extracted and merged. For units with an area smaller than a preset area, they are merged into watershed units within a preset range according to the water catchment relationship to obtain preliminary county-level watershed management unit results.

[0015] Furthermore, in S300, the completeness and rationality of the preliminary county-level watershed management unit results are checked. Specific methods include: checking the completeness of the watershed management unit results by conducting a topological check to ensure that the preliminary county-level watershed management unit division results cover the entire administrative region; checking the rationality of the watershed management unit results by revising them in conjunction with township boundaries; if a township contains multiple watershed management units, the entire township is assigned to the watershed management unit with the largest area to obtain the final watershed management unit.

[0016] Secondly, embodiments of the present invention disclose a system for dividing county-level watershed management units, comprising: a basic data acquisition unit, a preliminary county-level watershed management unit result acquisition unit, and a county-level watershed management unit result checking unit; wherein:

[0017] The basic data acquisition unit is used to acquire basic data for the division of county-level watershed management units.

[0018] The preliminary county-level watershed management unit result acquisition unit is used to clarify the water catchment relationship based on the acquired basic data of division, divide the natural watershed units and artificial watershed units respectively, merge and optimize the natural watershed units and artificial watershed units, and obtain the preliminary county-level watershed management unit results;

[0019] The county-level watershed management unit result inspection unit is used to check the completeness and rationality of the preliminary county-level watershed management unit results, and output and display the county-level watershed management unit results that have passed the inspection.

[0020] Thirdly, embodiments of the present invention disclose an electronic device, comprising:

[0021] One or more processors;

[0022] Memory, used to store one or more programs;

[0023] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for dividing county-level watershed management units.

[0024] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0025] This invention discloses a method for delineating county-level watershed management units, comprising: acquiring basic data for county-level watershed management unit delineation; clarifying water catchment relationships based on the acquired basic data, delineating natural watershed units and artificial watershed units respectively, merging and optimizing the natural and artificial watershed units to obtain preliminary county-level watershed management unit results; checking the completeness and rationality of the preliminary county-level watershed management unit results, and outputting and displaying the county-level watershed management unit results that pass the check. This invention, by combining the judgment of natural and artificial watersheds, to a certain extent solves the problem of the difficulty in delineating watershed management units in county-level research areas; this invention utilizes administrative boundaries to modify watershed management units, forming a set of technical methods for delineating county-level watershed management units, enhancing the completeness and scientific nature of county-level watershed management units.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a flowchart of a method for dividing county-level watershed management units in Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram illustrating the determination of water flow direction in Embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the extracted natural watershed in Embodiment 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of the artificial watershed extracted in Embodiment 1 of the present invention;

[0032] Figure 5 This is a schematic diagram of the optimization of natural artificial watersheds in Embodiment 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of the division of county-level watershed management units in Embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of an electronic device in Embodiment 3 of the present invention. Detailed Implementation

[0035] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0036] To address the problems existing in the prior art, embodiments of the present invention provide a method and system for dividing county-level watershed management units.

[0037] Example 1

[0038] This invention discloses a method for dividing county-level watershed management units, such as... Figure 1 ,include:

[0039] S100. Obtain basic data for the division of county-level watershed management units; In S100 of this embodiment, the basic data for the division of county-level watershed management units includes at least city, county, and township-level administrative boundary data, water system-related data within the county, topographic and geomorphological data, transportation network data, and vector data of dikes, irrigation areas, and flood storage areas. After obtaining this data, it is necessary to integrate, clean, and verify the data to ensure its accuracy and consistency. Furthermore, depending on the specific needs of watershed management, further processing and analysis of the data may be required.

[0040] Specifically, based on data from the land change survey database, the administrative boundaries of cities, counties, and townships within a certain county are clarified. Data on important topography, water systems, transportation networks, dikes, irrigation areas, flood storage and detention areas, important transportation arteries, and important water conservancy projects within the study area are sorted out, and the division of county-level watershed management units is carried out.

[0041] S200. Based on the obtained basic data for division, clarify the water catchment relationships, divide the natural watershed units and artificial watershed units respectively, merge and optimize the natural watershed units and artificial watershed units, and obtain preliminary county-level watershed management unit results;

[0042] In S200 of this embodiment, the water catchment relationship is determined based on the acquired basic data of the division. The specific method includes: obtaining the confluence direction and water flow direction of the water system based on the acquired water system-related data, and determining the water catchment relationship based on the confluence direction and water flow direction. A schematic diagram of the water system flow direction determination is shown below. Figure 2 As shown.

[0043] Specifically, methods for determining confluence and catchment directions include: processing water system data using the hydrological analysis module of GIS software (such as ArcGIS). This involves operations such as depression filling, flow direction analysis, and flow rate analysis to determine the confluence direction of the water system. Alternatively, an eight-direction (D8) flow direction modeling method can be used. Based on the flow direction from each pixel to its adjacent point on the steepest downslope, a flow direction raster is created. Each pixel in the flow direction raster has a value representing the direction of water flow. Based on the flow direction raster, the catchment direction of each water body (such as rivers and lakes) can be determined.

[0044] After determining the confluence and drainage directions, the watershed is divided using basin analysis tools based on flow direction raster data. Drainage relationships are then established, and based on the watershed division results, the drainage relationships between different water bodies can be determined. The drainage relationships shown refer to the paths and relationships of upstream water bodies flowing to downstream water bodies.

[0045] In S200 of this embodiment, natural watershed units are divided based on the acquired basic data. The specific method includes: performing hydrological analysis using topographic data to extract natural watersheds, and then using the natural watersheds to divide the natural watershed units. A schematic diagram of the natural watershed unit division is shown below. Figure 3 As shown.

[0046] Specifically, hydrological analysis is performed using topographic data to extract natural watersheds, which are then used to divide natural watershed units. First, slope is calculated based on the elevation differences between adjacent pixels in the DEM (Digital Elevation Model), using finite difference or other algorithms. Next, flow direction is analyzed, calculating the flow direction for each pixel using DEM data to determine the water flow path and confluence point. Finally, the watershed line is extracted, using flow direction information to progressively advance upstream and determine the boundary of each watershed. Algorithms are used to identify topographic peaks, which are then used as candidate points for the watershed line, and combined with flow direction information, the watershed is derived.

[0047] After obtaining the watershed line, the natural watershed units are divided. First, the watersheds are divided. Once the natural watershed is extracted, the watershed division process involves delineating the boundaries of each catchment area based on the watershed line. This can be done using a rasterization method. Using raster data, through flow direction analysis and watershed extraction results, a unique identifier is assigned to each watershed unit. Watershed attributes are then calculated. The divided watershed units can have their relevant attributes calculated, such as catchment area, catchment perimeter, average slope, and catchment density. These attributes are crucial for inputting hydrological models and for watershed water resource management. The hydrological model is then applied. Using the divided natural watershed units, precipitation-runoff processes in different regions can be simulated, and water flow in different watersheds can be calculated. By analyzing the water resource situation in different watersheds, the water supply and demand of each watershed can be assessed, aiding in the rational allocation of water resources within the watershed.

[0048] In S200 of this embodiment, artificial watershed units are divided according to the acquired basic data. The specific method includes: based on the acquired vector data of county-level road networks, dikes, irrigation areas, and flood storage areas, converting major transportation arteries with physical roadbeds (highways, national highways, provincial highways, and railways), as well as dikes, irrigation areas, and flood storage areas, into single-line layers; connecting these line layers; and dividing and connecting the gaps between line layers according to the actual terrain to divide the artificial watershed units. A schematic diagram of the artificial watershed unit division is shown below. Figure 4 As shown.

[0049] In S200 of this embodiment, the natural watershed units and artificial watershed units are merged and optimized to obtain preliminary county-level watershed management unit results. The specific method includes: based on the divided natural watershed units, extracting natural watershed units from hilly and mountainous terrain areas and artificial watershed units from plain terrain areas for merging; for units with an area smaller than a preset area, merging them into nearby watershed units within a preset range based on their catchment relationships, thus obtaining preliminary county-level watershed management unit results. In this embodiment, the preset area is preferably 100 km². 2 The natural and artificial watershed units are merged and optimized as follows: Figure 5 As shown.

[0050] S300. Check the completeness and rationality of the preliminary county-level watershed management unit results, and output and display the county-level watershed management unit results that have passed the check.

[0051] In S300 of this embodiment, the completeness and rationality of the preliminary county-level watershed management unit results are checked. Specifically, the method includes: checking the completeness of the watershed management unit results by performing a topological check to ensure that the preliminary county-level watershed management unit division results cover the entire administrative region; and checking the rationality of the watershed management unit results by revising them in conjunction with township boundaries. If a township contains multiple watershed management units, the entire township is assigned to the watershed management unit with the largest area, thus obtaining the final watershed management unit. A schematic diagram of the final watershed management unit is shown below. Figure 6 As shown.

[0052] This embodiment discloses a method for delineating county-level watershed management units, comprising: acquiring basic data for county-level watershed management unit delineation; clarifying water catchment relationships based on the acquired basic data, delineating natural watershed units and artificial watershed units respectively, merging and optimizing the natural and artificial watershed units to obtain preliminary county-level watershed management unit results; checking the completeness and rationality of the preliminary county-level watershed management unit results, and outputting and displaying the county-level watershed management unit results that pass the check. This embodiment, by combining the judgment of natural and artificial watersheds, solves to some extent the problem of the difficulty in delineating watershed management units in county-level research areas; this invention uses administrative boundaries to modify watershed management units, forming a set of technical methods for delineating county-level watershed management units, enhancing the completeness and scientific nature of county-level watershed management units.

[0053] Example 2

[0054] Based on the same inventive concept, this disclosure also provides a system for dividing county-level watershed management units, including: a basic data acquisition unit, a preliminary county-level watershed management unit result acquisition unit, and a county-level watershed management unit result checking unit; wherein:

[0055] The basic data acquisition unit is used to acquire basic data for the division of county-level watershed management units.

[0056] The preliminary county-level watershed management unit result acquisition unit is used to clarify the water catchment relationship based on the acquired basic data of division, divide the natural watershed units and artificial watershed units respectively, merge and optimize the natural watershed units and artificial watershed units, and obtain the preliminary county-level watershed management unit results;

[0057] The county-level watershed management unit result inspection unit is used to check the completeness and rationality of the preliminary county-level watershed management unit results, and output and display the county-level watershed management unit results that have passed the inspection.

[0058] The specific working methods of the basic data acquisition unit, the preliminary county-level watershed management unit result acquisition unit, and the county-level watershed management unit result inspection unit have been described in detail in Example 1, and will not be repeated here.

[0059] Example 3

[0060] Based on the same inventive concept, this disclosure also provides an electronic device. Figure 7 This is a schematic diagram of the structure of an electronic device according to an embodiment of this disclosure. Figure 7 As shown, this disclosure provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement any of the optimization methods described in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0061] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read / write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus).

[0062] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0063] In some embodiments, the one or more processors 101 include a field-programmable gate array.

[0064] According to embodiments of this disclosure, a computer-readable medium is also provided. This computer-readable medium stores a computer program, which, when executed by a processor, implements the steps of any of the optimized methods described in the above embodiments.

[0065] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0066] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0067] Those skilled in the art will also understand that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments herein can be implemented as electronic hardware, computer software, or a combination thereof. To clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in alternative ways for each specific application; however, such implementation decisions should not be construed as departing from the scope of this disclosure.

[0068] The steps of the methods or algorithms described in conjunction with the embodiments herein can be directly embodied in hardware, software modules executed by a processor, or a combination thereof. The software modules can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. The ASIC can reside in a user terminal. Alternatively, the processor and storage medium can exist as discrete components in the user terminal.

[0069] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. This software code can be stored in memory units and executed by a processor. The memory units can be implemented within the processor or outside the processor; in the latter case, they are communicatively coupled to the processor via various means, as is well known in the art.

[0070] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A method for dividing county-level watershed management units, characterized in that, include: S100. Obtain basic data for the division of county-level watershed management units; S200. Based on the acquired basic data for division, clarify the water catchment relationships, divide the natural watershed units and artificial watershed units respectively, and merge and optimize the natural watershed units and artificial watershed units to obtain preliminary county-level watershed management unit results; In S200, the specific method for merging and optimizing the natural watershed units and artificial watershed units to obtain preliminary county-level watershed management unit results includes: based on the divided natural watershed units and artificial watershed units, extract natural watershed units in hilly and mountainous terrain areas and artificial watershed units in plain terrain areas for merging, and for units with an area smaller than a preset area, merge them into watershed units within a preset range according to the water catchment relationships to obtain preliminary county-level watershed management unit results; In S200, the water catchment relationship is clarified based on the acquired basic data of the division. The specific method includes: obtaining the confluence direction and water flow direction of the water system based on the acquired water system related data, and obtaining the water catchment relationship based on the confluence direction and water flow direction. In S200, the natural watershed units are divided according to the acquired basic data for division. The specific methods include: performing hydrological analysis using topographic data, extracting natural watersheds, and using the natural watersheds to divide the natural watershed units. In S200, artificial watershed units are divided based on the acquired basic data. The specific method includes: based on the acquired vector data of county-level transportation network, dikes, irrigation areas, and flood storage areas, the main transportation arteries with physical roadbeds such as highways, national highways, provincial highways, and railways, as well as dikes, irrigation areas, and flood storage areas, are converted into single-line layers. The various line layers are connected, and the gaps between the line layers are divided and connected according to the actual terrain to divide the artificial watershed units. S300. Check the completeness and rationality of the preliminary county-level watershed management unit results, and output and display the county-level watershed management unit results that have passed the check.

2. The method for dividing county-level watershed management units as described in claim 1, characterized in that, In S100, the basic data for dividing the county-level watershed management units includes at least the administrative boundary data of cities, counties, and townships, water system-related data within the county, topographic data, transportation network data, and vector data of dikes, irrigation areas, and flood storage areas.

3. The method for dividing county-level watershed management units as described in claim 1, characterized in that, In S300, the completeness and rationality of the preliminary county-level watershed management unit results are checked. The specific methods include: checking the completeness of the watershed management unit results by conducting a topological check to ensure that the preliminary county-level watershed management unit division results cover the entire administrative region; checking the rationality of the watershed management unit results by revising them in conjunction with township boundaries. If a township contains multiple watershed management units, the entire township is assigned to the watershed management unit with the largest area to obtain the final watershed management unit.

4. A system for dividing county-level watershed management units, employing the unit division method of any one of claims 1-3, characterized in that, include: The system comprises three units: a basic data acquisition unit, a preliminary county-level watershed management unit results acquisition unit, and a county-level watershed management unit results inspection unit; among which: The basic data acquisition unit is used to acquire basic data for the division of county-level watershed management units. The preliminary county-level watershed management unit result acquisition unit is used to clarify the water catchment relationship based on the acquired basic data of division, divide the natural watershed units and artificial watershed units respectively, merge and optimize the natural watershed units and artificial watershed units, and obtain the preliminary county-level watershed management unit results; The county-level watershed management unit result inspection unit is used to check the completeness and rationality of the preliminary county-level watershed management unit results, and output and display the county-level watershed management unit results that have passed the inspection.

5. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method of dividing any unit in claims 1-3.

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