JP7290786B1 - Confluence method, apparatus, equipment and storage medium based on structured mesh - Google Patents

Abstract

A confluence and connection method and apparatus based on a structural mesh that can solve the problem that the connection calculation efficiency of the two-dimensional confluence of the ground slope and the one-dimensional confluence of the river network is low, and the consideration is incomplete and affects the accuracy rate of the connection. , provides equipment and storage media. A step of obtaining ground surface geographic data and river network geographic data in a target area, a step of performing discretization processing on the ground surface geographic data to obtain a ground surface two-dimensional mesh model, and a step of obtaining a ground surface two-dimensional mesh model; Performing discretization processing to obtain a one-dimensional line segment model of the river network, and based on the superposition relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network, joint calculation is performed for the confluence of the ground surface and the river network. and a step of performing. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to the technical field of slope river network confluence coupling simulation, and more specifically to a confluence coupling method, apparatus, equipment and storage medium based on structural mesh.

In actual construction, there is generally a problem of joint calculation of two-dimensional confluence of the river network area ground surface slope in the plain area and one-dimensional confluence of the river network. There is a boundary correspondence join method. In the non-structured mesh boundary support method, a boundary is set at the boundary between the slope and the river channel, and the number of meshes that need to be divided by joining the slope 2D unit and the river channel 1D unit at the boundary is large, In addition, it requires one-to-one correspondence between river mesh nodes and surface mesh nodes, and the mesh topology relationship is complicated, which affects the computation efficiency, and the topology structure and computation method of the fixed node connection method is simple. However, it generally considers only one-way exchange from the slope two-dimensional confluence area to the river network area, and ignores the situation of the collapse of the dam existing in the river channel. Therefore, how to quickly and accurately realize the combination of the two-dimensional confluence of the ground slope and the one-dimensional confluence of the river network is a technical problem that should be solved as soon as possible.

In view of this, the embodiments of the present invention solve the problem that the combination calculation efficiency of the two-dimensional confluence of the ground slope and the one-dimensional confluence of the river network is low, and the consideration is incomplete and affects the accuracy rate of the combination. Thus, a confluence coupling method, apparatus, apparatus and storage medium based on structured mesh are provided.

According to a first aspect, an embodiment of the present invention comprises the steps of obtaining ground surface geographic data and river network geographic data in a target area; performing discretization processing on the ground surface geographic data; performing discretization processing on the river network geographic data to obtain a river network one-dimensional line segment model; and performing connection calculations for surface confluences and river network confluences.

In the confluence and connection method based on the structural mesh according to the embodiment of the present invention, a two-dimensional ground surface mesh model and a one-dimensional river network line segment model are generated by performing discretization processing on the ground surface geographic data and the river network geographic data. Then, based on the overlapping relationship between the two-dimensional mesh model and the one-dimensional line segment model, the overlapping and non-overlapping positions of the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network are determined. Coupling calculations are performed for confluences. The method does not require a specific boundary position between the ground surface and the river network, nor does it require a one-to-one correspondence between the ground surface two-dimensional mesh and the river channel, simplifying the topology structure. to improve the efficiency of the joint calculation, and to discretize the river network geographic data and the surface geographic data sufficiently to avoid the influence on the confluence joint calculation caused by not considering the relevant information of the river channel. can improve the accuracy rate of confluence join calculations.

Referring to the first aspect, in the first embodiment of the first aspect, based on the superimposition relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network, the connection between the ground surface confluence and the river network confluence is performed. The step of calculating includes obtaining a first coordinate position where the ground surface two-dimensional mesh is located and a second coordinate position where the one-dimensional river network line segment is located; determining whether the first coordinate position and the second coordinate position overlap; calculating the amount of water exchanged between the ground surface and the river network when the first coordinate position and the second coordinate position overlap; and calculating a river network confluence based on the water exchange rate and the one-dimensional Krisnan equation.

In the confluence and connection method based on the structural mesh according to the embodiment of the present invention, when calculating the amount of exchanged water at the overlapping position of the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network, the exchange from the ground surface to the river network Both the water volume and the exchange water volume from the river network to the surface were considered. Calculate the river network confluence and surface confluence in overlapping position with two-way exchange water volume between the surface and the river network, so as to ensure the accuracy rate of the confluence coupling calculation.

With reference to the first embodiment of the first aspect, in the second embodiment of the first aspect, the step of calculating the amount of water exchanged between the ground surface and the river network is based on the river water level information for the one-dimensional line of the river network. and a step of acquiring mesh water level information for each of the two-dimensional meshes of the ground surface; a step of determining whether the river channel water level information and the mesh water level information satisfy an exchange condition; and calculating the replacement water volume using a weir formula if the replacement condition is met.

In the confluence and coupling method based on the structural mesh according to the embodiment of the present invention, when calculating the water exchange amount, according to the water level information of each surface two-dimensional mesh, determine whether it is necessary to calculate the water exchange amount at present; If there is no need to calculate, the surface confluence and river network confluence can be calculated directly, reducing the calculation steps. If the exchange condition is satisfied, it indicates that there is water exchange between the ground surface and the river network. Determine the confluence and ensure the accuracy of surface confluence calculations.

Referring to the first embodiment of the first aspect, in the third embodiment of the first aspect, the ground surface confluence and the river network are calculated based on the overlapping relationship between the ground surface two-dimensional mesh model and the river network one-dimensional line segment model. In the step of performing coupling calculation for a confluence, if the first coordinate position and the second coordinate position do not overlap, the surface confluence is calculated by a two-dimensional Krisnan equation, and the river network confluence is calculated by a one-dimensional Krisnan equation. Further including steps.

In the confluence coupling method based on the structural mesh according to the embodiment of the present invention, when there is no overlap between the ground surface and the river channel, the surface confluence is directly calculated by the two-dimensional Krisnan equation, and the river network confluence is calculated by the one-dimensional Krisnan equation. It only needs to be calculated, and the calculation efficiency of the confluence connection is improved.

With reference to the first aspect, in the fourth embodiment of the first aspect, the step of performing discretization processing on the ground surface geographic data to obtain a ground surface two-dimensional mesh model includes: obtaining a plurality of two-dimensional meshes by performing mesh discretization on the ground surface two-dimensional mesh; obtaining information; constructing a first parameter matrix corresponding to each said two-dimensional mesh based on said encoded information; and determining as

In the confluence and coupling method based on the structural mesh according to the embodiment of the present invention, mesh discretization is performed on the area where it is located through the river network geographic data, and the hydrodynamic parameters of each two-dimensional mesh are obtained by encoding it. A two-dimensional mesh is used to ensure that the constructed two-dimensional mesh model of the ground surface can simulate the ground surface data as much as possible, and facilitate the calculation of the ground surface confluence.

Referring to the fourth embodiment of the first aspect, in the fifth embodiment of the first aspect, the step of performing discretization processing on the river network geographic data to obtain a one-dimensional line segment model of the river network includes: obtaining a plurality of one-dimensional river channel segments by separating and dispersing a river channel region corresponding to the river network geographic data; and encoding the one-dimensional river channel segments according to the first preset encoding method. obtaining second encoded information of the one-dimensional river channel segment by performing encoding processing; and determining river segment attribute information corresponding to the river channel based on the second encoded information and the river network geographic data. and determining the river channel one-dimensional line segment on which the river segment attribute information is to be placed as the river network one-dimensional line segment model.

In the confluence and connection method based on the structural mesh according to the embodiment of the present invention, line segmentation is performed on the river channel area in which it is located through the river network geographic data, and it is encoded according to the encoding method of the two-dimensional mesh of the ground surface. It facilitates encoding and superimposing the one-dimensional line segment model of the river network and the two-dimensional mesh model of the ground surface, thereby determining the overlapping position of the river network and the ground surface, and facilitating the subsequent water exchange calculation.

Referring to the fifth embodiment of the first aspect, in the sixth embodiment of the first aspect, the method performs a segmentation process on the river channel based on the river network geographic data, and divides a plurality of channel sub-segments into encoding the channel sub-segments according to a second preset encoding scheme to obtain channel segmentation encoding information including upstream and downstream relationships of the channel; and based on the channel segmentation encoding information, each The method further includes constructing a second parameter matrix corresponding to the river channel sub-segments, and determining a river channel sub-segment on which each of the second parameter matrices is placed as a river network calculation model.

In the confluence-and-bonding method based on the structural mesh according to the embodiment of the present invention, the river channel can be segmented via the river network geographic data, the channel segmentation can be encoded to determine the upstream-downstream relationship of the channel, and then the hydropower A parameter is assigned to each channel segment to ensure that the constructed river network calculation model simulates the river network data to the maximum, and facilitates the calculation of the river network confluence.

According to a second aspect, an embodiment of the present invention provides an acquisition module used to acquire surface geographic data and river network geographic data in a target area, performing a discretization process on the surface geographic data, a first processing module used to obtain a two-dimensional mesh model; a second processing module used to perform discretization processing on the river network geographic data to obtain a river network one-dimensional line segment model; a confluence based on a structural mesh including a connection module used for performing connection calculations for the surface confluence and the river network confluence based on the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network; A coupling device is provided.

According to a third aspect, an embodiment of the invention includes a memory and a processor communicatively coupled to each other, wherein computer instructions are stored in the memory, the processor executing the computer instructions to: Provided is an electronic device for performing the structured mesh-based confluence method according to any of the embodiments of the first aspect or the first aspect.

According to a fourth aspect, an embodiment of the present invention comprises stored computer instructions for causing a computer to perform the structured mesh-based confluence method according to any of the embodiments of the first aspect or the first aspect. A computer readable storage medium is provided.

For the corresponding beneficial effects of the structured mesh-based confluence coupling device, the electronic device and the computer-readable storage medium according to the embodiments of the present invention, please refer to the corresponding content description in the structured mesh-based confluence method, here. We omit the explanation here.

In order to describe the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the drawings that need to be used to describe the specific embodiments or the prior art, Apparently, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without creative efforts.
4 is a flow chart of a confluence and join method based on structured mesh according to an embodiment of the present invention; FIG. 4 is another flow chart of a confluence and join method based on structured mesh according to an embodiment of the present invention; FIG. FIG. 5 is yet another flow chart of a confluence and join method based on a structured mesh according to an embodiment of the present invention; FIG. FIG. 2 is a schematic diagram of a two-dimensional mesh of ground surface and a river channel segment according to an embodiment of the present invention; 1 is a structural block diagram of a confluence coupling device based on structural mesh according to an embodiment of the present invention; FIG. 1 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present invention; FIG.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, hereinafter refer to the drawings in the embodiments of the present invention to clearly and completely understand the technical solutions in the embodiments of the present invention. To be clear, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art on the premise that they do not make creative efforts shall fall within the protection scope of the present invention.

According to an embodiment of the present invention, an embodiment of a confluence and join method based on structural mesh is provided, wherein the steps illustrated in the flow chart of the drawings can be executed in a computer system in a set of computer-executable instructions. It is possible, and although the flow charts show a logical order, in some cases the steps shown or described can be performed in a different order.

This embodiment provides a confluence and coupling method based on structural mesh, which can be applied to electronic devices such as computers, tablet computers, servers, etc. FIG. 1 is a flow chart of a method, as shown in FIG. 1, the flow includes steps S11 to S14 as follows.

In S11, ground surface geographic data and river network geographic data in the target area are acquired.

The target area is the combined target area of the land slope confluence and the river network confluence, the land geographic data is used to characterize the geographic attributes of the land slope, and the river network geographic data is used to characterize the geographic attributes of the river network. used for The surface geographic data and river network geographic data can be obtained in real time or in a timed manner by geographic collection equipment installed in the current area, and the geographic collection equipment collects the collected surface geographic data and river network geographic data. It can be transmitted to an electronic device, which can store and retrieve the surface geographic data and river network geographic data. Of course, the electronic device can also obtain the surface geographic data and the river network geographic data in the target area by querying the database in the Geographic Information System (GIS) therein. Here, the acquisition method of the surface geographic data and the river network geographic data is not specifically limited, and can be determined by those skilled in the art according to actual needs.

In S12, the ground surface geographic data is subjected to discretization processing to obtain a ground surface two-dimensional mesh model.

The electronic device performs discretization processing on the obtained geographic data, divides the slope area into regular mesh units, and assigns values to attribute parameters such as moisture and hydraulic power corresponding to each mesh unit. Each mesh unit has an element value that can express its geographical feature, and each mesh unit carrying the element value of the geographical feature is a two-dimensional mesh model of the ground surface constructed by an electronic device. is.

In S13, the river network geographic data is subjected to discretization processing to obtain a river network one-dimensional line segment model.

The electronic device performs discretization processing on the acquired geographic data on the river network, abstracts the river network area into line segment units, and assigns values to attribute parameters such as water content and hydraulic power corresponding to each line segment unit. By doing so, each line segment unit has an element value that can express its geographical feature, and each line segment unit on which the element value of the geographical feature is placed is a river network one-dimensional line segment model constructed by an electronic device. be.

In S14, a connection calculation is performed for the confluence of the ground surface and the confluence of the river network based on the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network.

The electronic device locates the mesh units and the line units in the two-dimensional mesh model of the ground according to the same coordinate system or the same encoding method, and compares the positions where the mesh units are located and the positions where the line units are located. By doing so, it is possible to determine the overlapping position of the two-dimensional mesh and the one-dimensional line segment, thereby determining the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network. Based on the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network, the boundary area between the slope and the river channel is merged, and the non-boundary area is directly connected to the ground surface and river network. can be calculated.

In the confluence and connection method based on the structure mesh according to the present embodiment, a two-dimensional surface mesh model and a one-dimensional river network line segment model are generated by performing discretization processing on the geographic data on the ground surface and the geographic data on the river network, After that, based on the overlapping relationship between the two-dimensional mesh model and the one-dimensional line segment model, the overlapping and non-overlapping positions of the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network are determined. perform join calculations on The method does not need to clarify the specific boundary position between the ground surface and the river network, nor does it require that the ground surface two-dimensional mesh corresponds to the river channel in a one-to-one manner, simplifying the topology structure. to improve the efficiency of the joint calculation, and to discretize the river network geographic data and the surface geographic data sufficiently to avoid the influence on the confluence joint calculation caused by not considering the relevant information of the river channel. can improve the accuracy rate of confluence join calculations.

This embodiment provides a confluence and coupling method based on structural mesh, which can be used in electronic devices such as computers, tablet computers, servers, etc. FIG. FIG. 2 is a flow chart of the method, as shown in FIG. 2, the flow includes steps S21 to S24 as follows.

In S21, ground surface geographic data and river network geographic data in the target area are acquired. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

In S22, the ground surface geographic data is subjected to discretization processing to obtain a ground surface two-dimensional mesh model. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

In S23, the river network geographic data is subjected to discretization processing to obtain a river network one-dimensional line segment model. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

In S24, based on the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network, a connection calculation is performed for the confluence of the ground surface and the river network confluence.

Optionally, step S24 above may include the following S241-S245.

In S241, the first coordinate position where the ground surface two-dimensional mesh is located and the second coordinate position where the river network one-dimensional line segment is located are acquired.

The electronic device determines the coordinates of the corner points of each two-dimensional mesh unit through the same coordinate system, for example, the lower left corner is the origin (0, 0), the right of the origin is (1, 0), Assuming that (0, 1) is just above the origin, the coordinate position of each mesh unit, that is, the first coordinate position, can be determined by analogy.

Similarly, the electronic device can determine the relative position between the one-dimensional line segment and the two-dimensional mesh based on the geographical position relationship between the river network geographic data and the ground geographic data, and the same coordinates Through the system, the coordinate position at which each point on the one-dimensional line segment is located, ie the second coordinate position, can be determined.

In S242, it is determined whether or not the first coordinate position and the second coordinate position overlap.

The electronic device compares the first coordinate position and the second coordinate position, and determines whether the first coordinate position and the second coordinate position overlap. If the first coordinate position and the second coordinate position overlap, step S243 is executed; if the first coordinate position and the second coordinate position do not overlap, step S245 is executed.

At S243, the amount of water exchanged between the ground surface and the river network is calculated.

Water exchange is the exchange of water flow between the land surface and the river network, which includes water flow from the slope to the channel and from the channel to the slope. If the first coordinate position and the second coordinate position overlap, it indicates that there is an exchange of water flow between the ground slope and the channel, i.e. the two-dimensional mesh is a boundary mesh that joins the channel, where: The electronic device can calculate the exchange of water flow between them according to the hydrodynamic characteristics of the ground slope and the hydrodynamic characteristics of the river channel, ie the amount of water flow exchange between the ground surface and the river network.

Specifically, the above step S243 may include the following steps.

(1) Acquire the river water level information of the one-dimensional line segment of the river network and the mesh water level information of each surface two-dimensional mesh.

The mesh water level information is the water level value of the two-dimensional mesh unit, and the river channel water level information is the water level value of the river channel at the position corresponding to the mesh unit.

Specifically, the electronic device acquires the moisture characteristics of the river channel and the moisture characteristics of the ground slope by collating the database in the GIS, and then analyzes the moisture characteristics to obtain the river channel water level information and mesh water level information. decide.

Specifically, the water level information may further transmit the water level information collected by the water level measuring device to the electronic device, and the electronic device may obtain the river channel water level information and the mesh water level information of each surface two-dimensional mesh. good.

Specifically, the water level information may be uploaded by the technician, and correspondingly, the electronic device responds to the upload operation to obtain the channel water level information and the mesh water level information uploaded by the technician. good too. Naturally, the river channel water level information and the mesh water level information may be obtained by other methods, and are not particularly limited here.

(2) Determine whether the river water level information and the mesh water level information satisfy the exchange conditions.

The exchange condition is to preset the water level value of the river channel and the water level value of the mesh unit that need to calculate the amount of water exchanged. Let _Ze be the elevation of the weir, this value is the elevation of the river embankment, and if the river water level information is _Zr and the mesh water level information is _Zc , both _Zr and _Zc are smaller than _Ze , The water exchange amount is not calculated, ie the water exchange amount _Ql is zero. Therefore, after acquiring the river water level information and the mesh water level information, the electronic device must compare the values of the river water level information and the mesh water level information with the elevation of the weir, and determine whether they satisfy the exchange conditions. If the water level information satisfies the replacement condition, execute step (3); otherwise, do not calculate the replacement water amount.

(3) If the river water level information and the mesh water level information satisfy the exchange conditions, the weir formula is used to calculate the amount of exchanged water.

である場合、水流が二次元メッシュユニットから河道線分ユニットに流れ、すなわち河道と地表法面との間に水流の交換が存在することを示し、Ｚ_ｒ＜Ｚ_ｃ且つ

である場合、水流が河道線分ユニットから二次元メッシュユニットに流れ、すなわち河道と地表法面との間に水流の交換が存在することを示し、この場合、２次元メッシュユニットの水流の流速、方向から、水流が２次元メッシュユニットから流出するか、又は水流が２次元メッシュユニットに流入するかを判定し、交換水量の計算を行うことができる。 _Ze is the elevation of the weir, Z _r is the river water level information, Z _c is the mesh water level information, and Z _r >Z _c and

indicates that the water flow flows from the two-dimensional mesh unit to the channel segment unit, i.e. there is an exchange of water flow between the channel and the ground slope, Z _r <Z _c and

, indicates that the water flow flows from the channel segment unit to the two-dimensional mesh unit, i.e., there is an exchange of water flow between the channel and the ground slope, in which case the velocity of the water flow in the two-dimensional mesh unit, From the direction, it is possible to determine whether the water flow is flowing out of the two-dimensional mesh unit or whether the water flow is flowing into the two-dimensional mesh unit, and calculation of the replacement water amount can be performed.

Specifically, the weir formula for calculating the exchanged water amount _Ql is as follows.

Here, h _max and h _min are calculated respectively as follows.

Here, _Zr and _Zc are the upstream and downstream water levels of the weir, taking the water level value of the river line segment unit and the water level value of the two-dimensional mesh unit, respectively, and _Zc is the altitude of the weir, and the altitude of the river embankment where b _e is the width of the weir, and the length of the side connecting the two-dimensional mesh unit and the river line segment unit is taken.

Note that _Zc is the water level value of the two-dimensional mesh unit connected to the river channel segment unit, _Zr is the water level value of the river channel unit at the position corresponding to the two-dimensional mesh unit, and the water level value is the upstream and downstream cross section of the river channel. is obtained by performing interpolation calculation on the water level value of , and the method of calculating _Zr by interpolation is known to those skilled in the art, so the description is omitted here.

When calculating the exchange water quantity, according to the water level information of each surface two-dimensional mesh, it is determined whether it is necessary to calculate the exchange water quantity at present. , reducing the number of computation steps. If the exchange condition is satisfied, it indicates that there is water exchange between the ground surface and the river network. Determine confluence and ensure accuracy of surface confluence calculations.

In S244, the surface confluence is calculated based on the amount of exchanged water and the two-dimensional Krisnan equation, and the river network confluence is calculated based on the amount of exchanged water and the one-dimensional Krisnan equation.

After obtaining the amount of exchanged water, it can be combined with the two-dimensional Krisnan equation to obtain the surface confluence value, and the specific calculation formula is shown as follows.

であり、Ｉは浸透率であり、

である。 where S is the source item used to characterize the surface confluence, Q _l is the exchange water volume, g is the gravitational acceleration, h is the water depth, and u _x and u _y are the x and u y directions, respectively. represents the flow velocity in the y direction, S _0,x and S _0,y represent the source items in the x and y directions caused by changes in the bottom slope, and S _f,x and S _f,y represent the Representing the source items in the generated x and y directions, R is the rainfall,

and I is the permeability,

is.

In addition, the river network confluence is calculated by combining the amount of exchanged water and the one-dimensional Krisnan equation, and the specific calculation formula is shown as follows.

Here, Q _l is the amount of exchanged water, Q is the flow rate, A is the area of the permeate cross section, x is the distance, t is the time, and q _L is the unit width flow rate ( (including two-dimensional mesh unit inflow and tributary inflow), v _x is the amount along the water flow direction that inflowed from the lateral direction, usually v _x = 0, H is the hydraulic head of the node, g is the gravitational acceleration, S _f Assuming is the frictional drag specific drop, the river network confluence may be calculated using the Manning formula.

In S245, the land surface confluence is calculated by the two-dimensional Krisnan equation, and the river network confluence is calculated by the one-dimensional Krisnan equation.

If the first coordinate position and the second coordinate position overlap, it indicates that there is an exchange of water flow between the slope and the channel, i.e. the two-dimensional mesh is not a boundary mesh that joins the channel, in this case: The surface confluence can be directly calculated using the two-dimensional Krisnan equation, and the specific calculation formula is shown as follows.

であり、Ｉは浸透率であり、

である。 where g is the gravitational acceleration, h is the water depth, u _x and u _y represent the flow velocities in the x and y directions, respectively, and S _0,x and S _0,y are caused by changes in the bottom slope. S _f,x and S _f,y represent source items in the x and y directions caused by friction, R is rainfall,

and I is the permeability,

is.

In addition, the river network confluence is calculated by the one-dimensional Krisnan equation, and the specific calculation formula is shown as follows.

where Q is the flow rate, A is the area of the permeate cross section, x is the distance, t is the time, and q _L is the unit width flow rate inflowed from the lateral direction (two-dimensional mesh unit inflow and tributary (including inflow), and v _x is the amount along the water flow direction that has flowed in from the lateral direction, usually v _x = 0, H is the water head at the node, g is the gravitational acceleration, and S _f is the frictional drag specific drop. , the river network confluence may be calculated using the Manning formula.

In the confluence and connection method based on the structural mesh according to the present embodiment, when calculating the exchanged water amount at the overlapping position of the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network, the amount of exchanged water from the ground surface to the river network and Both the amount of exchanged water from the river network to the surface was considered. By calculating the river network confluence and the surface confluence in overlapping positions with the two-way exchange water volume between the surface and the river network, the accuracy rate of the confluence coupling calculation is ensured. If there is no overlap between the land surface and the river channel, the land surface confluence can be directly calculated by the two-dimensional Krisnan equation, and the river network confluence can be calculated by the one-dimensional Krisnan equation, which improves the calculation efficiency of the confluence coupling.

This embodiment provides a confluence method based on structural mesh, which can be used in electronic devices such as computers, tablet computers, servers, etc. FIG. 3, which is a flow chart of the method, the flow includes the following steps S31 to S34.

In S31, ground surface geographic data and river network geographic data in the target area are acquired. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

In S32, the ground surface geographic data is subjected to discretization processing to obtain a ground surface two-dimensional mesh model.

Specifically, step S32 may include the following steps S321 to S324.

In S321, mesh discretization is performed on the ground surface region corresponding to the ground surface geographic data to obtain a plurality of two-dimensional meshes.

All geographic data on the ground correspond to a digital elevation model (DEM), and the DEM may be stored in the storage space of an electronic device or downloaded via a cloud or network. Correspondingly, based on the DEM of the surface area corresponding to the surface geographic data, the electronic device divides the surface area into regular two-dimensional mesh units, transforms the coordinates of the mesh units into projected coordinates, and performs the hole-filling process. so as to obtain a plurality of flat two-dimensional meshes (meshes as shown in FIG. 4).

In S322, the plurality of two-dimensional meshes are encoded according to the first preset encoding method to obtain the first encoded information of the two-dimensional ground surface mesh.

The first preset encoding scheme is a preset mesh encoding scheme, and the first encoding information is used to characterize the position where the mesh is located. Specifically, the electronic device encodes a plurality of two-dimensional meshes obtained by dividing according to the first preset encoding method, and determines the position where the meshes are located based on the first encoding information of the meshes. do. The origin is the lower left corner of the ground area, and integers are used to encode a plurality of two-dimensional meshes, i.e., the origin is the (0,0)th mesh, and directly to the right of the origin is the (1,0)th mesh, Right above the origin is the (0, 1)th, and by analogy in sequence, the first encoded information corresponding to each two-dimensional mesh can be obtained.

At S323, a first parameter matrix corresponding to each two-dimensional mesh is constructed based on the encoding information.

The first parameter matrix is used to characterize parameter matrices such as moisture properties and hydraulic properties corresponding to the current surface area, which are determined by analyzing the surface geographic data to obtain rainfall, roughness coefficients, and Parameters such as percolation coefficients can be obtained and corresponded to each two-dimensional mesh unit to obtain parameter matrices such as rainfall matrix, roughness coefficient matrix and saturated percolation coefficient matrix.

In S324, a two-dimensional mesh on which the first parameter matrix is placed is determined as a two-dimensional mesh model of the ground surface.

After obtaining the first parameter matrix and the ground two-dimensional mesh, the electronic device puts the first parameter matrix on the ground two-dimensional mesh to complete the construction of the ground two-dimensional mesh model.

In S33, the river network geographic data is subjected to discretization processing to obtain a river network one-dimensional line segment model.

Specifically, step S33 may include the following steps S331 to S338.

In S331, the river channel region corresponding to the river network geographic data is subjected to line separation and discretization to obtain a plurality of one-dimensional river channel segments.

The electronic device determines the geographical position points of the river channels by analyzing the river network geographic data, and generates a plurality of one-dimensional river channel segments according to the position points where each river channel is located.

In S332, encoding processing is performed on the one-dimensional river channel segment according to the first preset encoding method to obtain second encoded information on the one-dimensional river channel segment.

The second encoded information is used to characterize the position traversed by the line segment. Specifically, the electronic device superimposes a two-dimensional mesh on the ground surface and a one-dimensional river channel line segment from the ground surface geographic data and river network geographic data, and converts each river channel one-dimensional line segment using the encoding method of the two-dimensional mesh unit. Encoding processing is performed on this, and the position through which the river channel passes is determined through the second encoded information, and the line segment as shown in FIG. 4 is the river channel segment.

For example, the electronic device uses a geographic information tool such as arcgis to superimpose the one-dimensional line segment of the river channel and the two-dimensional mesh of the ground surface, encode the position through which the one-dimensional line segment passes using the first preset encoding method, Obtain the second encoded information of the one-dimensional river channel segment.

In S333, river segment attribute information corresponding to the river channel is determined based on the second encoded information and the river network geographic data.

River segment attribute information is used to characterize attribute information such as azimuth, slope, and river length of river segments. Attribute information such as corresponding azimuth, slope, river length, etc. may be determined.

In S334, the river channel one-dimensional line segment on which the river segment attribute information is to be placed is determined as the river network one-dimensional line segment model.

After obtaining the river segment attribute information and the river channel one-dimensional line segment, the electronic device puts the river segment attribute information on the river channel one-dimensional line segment to complete the construction of the river network one-dimensional line segment model.

Since the one-dimensional line segment in the river network one-dimensional line segment model is generated according to the position point where each river channel is located, its segmented length is irregular, and the river network one-dimensional line segment model is the river network one-dimensional line segment model can be used to calculate only the water volume exchange between and the ground slope. However, if there is no water volume exchange between the river channel and the ground slope, it is necessary to further calculate the river network confluence using a river network calculation model. Correspondingly, the above step S33 may further include the following steps S335 to S338.

In S335, the river channel is segmented based on the river network geographic data to obtain a plurality of river channel sub-segments.

The electronic device analyzes the river network geographic data, obtains characteristic attributes such as branch points, morphology and boundaries of the river channel from it, and then calculates the river channel based on the characteristic attributes such as branch points, morphology and boundaries of the river channel. A uniform segmentation process is performed on the sub-segments to obtain multiple river sub-segments.

At S336, encode the channel sub-segment according to a second preset encoding scheme to obtain channel segmentation encoding information, which includes upstream and downstream relationships of the channel.

The second preset encoding scheme is a preset channel segment encoding scheme for positioning a certain channel sub-segment through the channel segmentation encoding information. Specifically, the electronic device performs encoding processing on a plurality of river channel sub-segments obtained by dividing according to the second preset encoding method, and performs river channel segmentation encoding when performing river channel segmentation encoding. should contain fields to characterize upstream and downstream relationships of For example, represent channel segmentation locations and upstream/downstream relationships through a three-dimensional array (X, Y, Z), where X and Y represent channel coordinate locations and Z represents upstream/downstream relationships. Here, the encoding method for river channel segmentation is not particularly limited, and any encoding method that can characterize the position of the river channel and upstream/downstream relationship may be used.

At S337, a second parameter matrix corresponding to each channel sub-segment is constructed based on the channel segmentation encoding information.

The second parameter matrix is used to characterize parameter matrices such as moisture characteristics and hydraulic characteristics corresponding to the current river network region, which are obtained by analyzing the river network geographic data to determine the rainfall, coarseness, etc. corresponding to the current river network region. Parameters such as the degree coefficient and the permeability coefficient can be obtained, which correspond to each channel sub-segment to obtain parameter matrices such as the rainfall matrix, the roughness coefficient matrix and the saturated permeability coefficient matrix.

In S338, a river channel sub-segment on which each second parameter matrix is placed is determined as a river network calculation model.

After obtaining the second parameter matrix and the river sub-segment, the electronic device puts the second parameter matrix on each river sub-segment, completes the construction of the river network calculation model, the river network one-dimensional line model and the river network A computational model is determined as a river network one-dimensional line segment model.

In S34, a connection calculation is performed for the confluence of the ground surface and the confluence of the river network based on the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

In the confluence and coupling method based on the structural mesh according to the embodiment of the present invention, mesh discretization is performed on the area where it is located through the river network geographic data, and the hydrodynamic parameters of each two-dimensional mesh are obtained by encoding it. A two-dimensional mesh is used to ensure that the constructed two-dimensional mesh model of the ground surface can simulate the ground surface data as much as possible, and facilitate the calculation of the ground surface confluence. Through the river network geographic data, line segmentation is performed for the river channel area where it is located, it is encoded according to the encoding method of the two-dimensional mesh of the ground surface, and a one-dimensional line segment model of the river network and a two-dimensional mesh model of the ground surface , which determines the overlapping position of the river network and the land surface, facilitating subsequent water exchange calculations. Through the river network geographic data, the river channel can be segmented, the channel segmentation can be encoded to determine the upstream and downstream relationship of the channel, and then the hydraulic parameters can be associated with each channel segment, thus constructing the river network Ensure that the computational model simulates the river network data to the greatest extent possible, facilitating the computation of river network confluences.

This embodiment further provides a confluence and coupling device based on structural mesh, which is used to implement the above embodiments and preferred embodiments, and the description above is omitted. As used below, the term "module" can implement a combination of software and/or hardware capable of implementing a given function. Although the devices described in the examples below are preferably implemented in software, implementations in hardware or a combination of software and hardware are possible and conceivable.

This embodiment provides a confluence and combination device based on structural mesh, which includes an acquisition module 41, a first processing module 42, a second processing module 43 and a combination module 44, as shown in FIG.

Acquisition module 41 is used to acquire surface geographic data and river network geographic data in the target area. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

The first processing module 42 is used to perform discretization processing on the geographic data on the ground surface to obtain a two-dimensional mesh model of the ground surface. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

The second processing module 43 is used to perform discretization processing on the river network geographic data to obtain a river network one-dimensional line segment model. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

The connection module 44 is used to perform connection calculations for the surface confluence and the river network confluence based on the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network. For detailed description, please refer to the related description corresponding to the above embodiments, and the description is omitted here.

The confluence coupling device based on the structural mesh according to the present embodiment generates a two-dimensional surface mesh model and a one-dimensional river network line segment model by performing discretization processing on the geographic data on the ground surface and the geographic data on the river network, After that, based on the overlapping relationship between the two-dimensional mesh model and the one-dimensional line segment model, the overlapping and non-overlapping positions of the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network are determined. perform a join calculation on The apparatus does not need to define a specific boundary position between the ground surface and the river network, nor does it require a one-to-one correspondence of the two-dimensional mesh of the ground surface to the river channel, simplifying the topology structure. to improve the efficiency of the joint calculation, and to discretize the river network geographic data and the surface geographic data sufficiently to avoid the influence on the confluence joint calculation caused by not considering the relevant information of the river channel. can improve the accuracy rate of confluence join calculations.

The structural mesh-based confluence coupling device in this embodiment is represented in the form of functional units, where the units are ASIC circuits, processors and memories executing one or more software or fixed programs, and/or other Refers to equipment that can provide functionality.

Further functional descriptions of each of the above modules are similar to those of the corresponding embodiments above, and are omitted here.

An embodiment of the present invention further provides an electronic device, comprising a confluence coupling device based on the structural mesh shown in FIG. 5 above.

Please refer to FIG. 6, which is a structural schematic diagram of a terminal according to an optional embodiment of the present invention, as shown in FIG. 6, the terminal includes a central processing unit (CPU), etc. may include at least one processor 501 , at least one communication interface 503 , memory 504 and at least one communication bus 502 . Among these, the communication bus 502 is for realizing connection communication between these components. Among these, the communication interface 503 may include a display and a keyboard, and the communication interface 503 may optionally include a standard wired interface and a wireless interface. Memory 504 may be high speed volatile random access memory (RAM) or non-volatile memory, such as at least one magnetic disk memory. Memory 504 may optionally be at least one storage device remote from said processor 501 . Processor 501 may be combined with the system of FIG. 5, with application programs stored in memory 504, processor 501 calling program code stored in memory 504 to perform the steps of any of the above methods. used for

Here, the communication bus 502 may be a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, or the like. Communication bus 502 may be divided into an address bus, a data bus, a control bus, and the like. In FIG. 6, only one thick line is used for convenience of explanation, but it does not mean that there is only one bus or one type of bus.

Here, the memory 604 may include volatile memory, such as random-access memory (RAM), non-volatile memory, such as flash memory, hard disk. (HDD: hard disk drive) or solid-state hard disk (SSD: Solid-State drive), and may include a combination of the above types of memory.

Here, the processor 501 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP.

Here, the processor 501 may further include hardware chips. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), field-programmable gate array (FPGA), generic array logic (GAL), or any combination thereof. good.

Memory 6504 is also used to store program instructions. Processor 601 may invoke program instructions to implement a structured mesh-based confluence and join method as illustrated in the examples of FIGS. 1-3 herein.

An embodiment of the present invention further provides a non-transitory computer storage medium, in which computer-executable instructions are stored, the computer-executable instructions being the structural mesh in any of the above method embodiments. A processing method for a confluence join method based on can be implemented. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk (HDD), or a solid state It may be a hard disk (SSD: Solid-State Drive) or the like, and said storage medium may further comprise a combination of the above types of memory.

Although embodiments of the present invention have been described with reference to the drawings, various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention, and all such changes and modifications are included in the accompanying drawings. within the scope of the following claims.

Claims (7)

A confluence coupling method based on a structural mesh, comprising:
obtaining surface geographic data and river network geographic data in the target area;
a step of performing a discretization process on the ground surface geographic data to obtain a ground surface two-dimensional mesh model;
a step of performing discretization processing on the river network geographic data to obtain a river network one-dimensional line segment model;
performing a connection calculation for the ground surface confluence and the river network confluence based on the overlapping relationship between the ground surface two-dimensional mesh model and the river network one-dimensional line segment model;
The step of performing discretization processing on the ground surface geographic data to obtain a two-dimensional mesh model of the ground surface includes performing mesh discretization on the ground surface region corresponding to the ground surface geographic data to obtain a plurality of two-dimensional meshes. , performing an encoding process on the plurality of two-dimensional meshes according to a first preset encoding method to obtain first encoded information of a two-dimensional mesh of the ground surface; and based on the first encoded information , each of the constructing a first parameter matrix corresponding to a two-dimensional mesh; and determining a two-dimensional mesh on which each of the first parameter matrices is placed as the two-dimensional mesh model of the ground surface;
The step of performing discretization processing on the river network geographic data to obtain a river network one-dimensional line segment model includes:
obtaining a plurality of one-dimensional river channel segments by separating and dispersing the river channel region corresponding to the river network geographic data; performing an encoding process to obtain second encoded information of the one-dimensional river channel segment; and determining river segment attribute information corresponding to the river channel based on the second encoded information and the river network geographic data. determining, as the river network one-dimensional line segment model, the river network one-dimensional line segment on which the river segment attribute information is to be placed; performing segmentation processing on the river channel based on the river network geographic data to obtain a plurality of obtaining river channel sub-segments; encoding said river channel sub-segments according to a second preset encoding scheme to obtain channel segmentation encoding information including upstream-downstream relationships of river channels; and determining the river channel sub-segment on which each of the second parameter matrices is placed as a river network calculation model. A confluence and join method based on structural meshes characterized. The step of performing a connection calculation for a surface confluence and a river network confluence based on an overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network,
a step of obtaining a first coordinate position where the ground surface two-dimensional mesh is located and a second coordinate position where the river network one-dimensional line segment is located;
determining whether the first coordinate position and the second coordinate position overlap;
calculating the amount of exchanged water between the ground surface and the river network when the first coordinate position and the second coordinate position overlap;
2. The method of claim 1, comprising calculating surface confluence based on said water exchange rate and a two-dimensional Krisnan equation, and calculating river network confluence based on said water exchange rate and a one-dimensional Krisnan equation. Method. The step of calculating the amount of water exchanged between the surface and the river network comprises:
a step of acquiring the river channel water level information of the one-dimensional line segment of the river network and the mesh water level information of each of the two-dimensional meshes of the ground surface;
determining whether the river water level information and the mesh water level information satisfy an exchange condition;
3. The method of claim 2, further comprising: calculating the exchange water volume using a weir formula if the river water level information and the mesh water level information satisfy the exchange condition. The step of performing a connection calculation for a surface confluence and a river network confluence based on an overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network,
3. If the first coordinate position and the second coordinate position do not overlap, the steps of calculating land surface confluence by a two-dimensional Krisnan equation and calculating river network confluence by a one-dimensional Krisnan equation are further included. The method described in . A confluence coupling device based on a structural mesh, comprising:
an acquisition module used to acquire surface geographic data and river network geographic data in the target area;
obtaining a plurality of two-dimensional meshes by performing mesh discretization on the ground surface region corresponding to the ground surface geographic data; performing an encoding process on the plurality of two-dimensional meshes according to a first preset encoding scheme; Obtaining first encoding information of a two-dimensional mesh of the ground surface; constructing a first parameter matrix corresponding to each said two-dimensional mesh based on said first encoding information; and converting each said first parameter matrix into determining a two-dimensional mesh to be loaded as a two-dimensional mesh model of the ground surface; and
obtaining a plurality of one-dimensional river channel segments by separating and dispersing the river channel region corresponding to the river network geographic data; performing an encoding process to obtain second encoded information of the one-dimensional river channel segment; and determining river segment attribute information corresponding to the river channel based on the second encoded information and the river network geographic data. determining the river channel one-dimensional line segment on which the river segment attribute information is to be placed as a river network one-dimensional line segment model ; performing segmentation processing on the river channel based on the river network geographic data to form a plurality of river channels; obtaining sub-segments; encoding said channel sub-segments according to a second preset encoding scheme to obtain channel segmentation encoding information including upstream-downstream relationship of a channel; constructing a second parameter matrix corresponding to each of said river channel sub-segments based on said river network; and determining a river channel sub-segment on which said each said second parameter matrix is placed as a river network calculation model. a second processing module used to perform discretization processing on geographic data and obtain a river network one-dimensional line segment model;
a coupling module used to perform coupling calculations for the confluence of the ground surface and the confluence of the river network based on the overlapping relationship between the two-dimensional mesh model of the ground surface and the one-dimensional line segment model of the river network. A confluence coupling device based on a structural mesh that A structure according to any one of claims 1 to 4, comprising a memory and a processor communicatively coupled to each other, wherein computer instructions are stored in the memory, the processor executing the computer instructions to perform the computer instructions. An electronic device, characterized in that it implements a mesh-based confluence method. A computer-readable storage medium storing computer instructions for causing a computer to perform the structured mesh-based merging and joining method according to any one of claims 1 to 4.

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