An automatic determination method and system for a full-bank anti-seepage pumped storage power station dam site

Abstract

The present invention belongs to the technical field of reservoir-dam line design and provides a method and system for automatically determining the dam site of a full-reservoir anti-seepage pumped storage reservoir. The method comprises the following steps: S1, extracting the contour lines of the terrain surface corresponding to the elevation of the hydropower station; S2, selecting the contour line with the largest enclosed area; S3, generating a convex hull for the selected contour line; S4, connecting the extreme points of the convex hull into multiple straight line segments. i , the extreme points cut the contour lines into multiple curve segments pl i , multiple straight line segments l i and multiple curve segments pl i Enclose i closed areas; S5, select a closed area with a volume greater than a preset value V; S6, traverse the curve segment pl i Point j on the line segment l i Vertical line n j , calculate the perpendicular line n j Length h j , get the length h of the longest perpendicular line in each closed area ij max , calculate h ij max With the straight line segment l i S7: Set a threshold a and select a closed area where k > a as the selected reservoir dam location. This invention can accurately select a site, reduce human interference, and is applicable to various terrain environments.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of reservoir dam design, and particularly relates to an automatic determination method and system for a full-reservoir seepage-prevention pumped storage reservoir dam site. BACKGROUND

[0002] Dam site selection is one of the key works in the construction of hydropower stations, and directly affects the safety, economy and environmental impact of the project. The traditional pumped storage reservoir dam site selection mainly relies on manual survey and experience judgment, which has problems such as low efficiency, high cost and strong subjectivity. With the rapid development of remote sensing technology, geographic information system (GIS) and artificial intelligence technology, it is possible to automatically and quickly select a dam site that meets the engineering and environmental requirements from a topographic map using an algorithm, which will greatly improve the efficiency and scientificity of engineering construction. When selecting a reservoir dam site based on GIS, related geographic spatial data can be processed and analyzed, such as terrain analysis, hydrological analysis, geological analysis, etc. However, GIS analysis mainly relies on manually set rules and thresholds, which is difficult to handle complex nonlinear relationships and lacks learning ability, and cannot automatically extract knowledge from historical data. When the dam site selection problem is converted into a multi-objective decision problem, methods such as analytic hierarchy process (AHP) and fuzzy comprehensive evaluation can be used to comprehensively evaluate and sort the candidate dam sites. However, this method has the defects of strong subjectivity and difficulty in determining weights, and is difficult to handle high-dimensional and nonlinear complex data.

[0003] Therefore, if an algorithm can automatically and quickly select a geographic location that meets the engineering and environmental requirements from a topographic map and be used for the site selection and construction of a full-reservoir seepage-prevention pumped storage reservoir dam, the efficiency of engineering construction can be effectively improved. SUMMARY

[0004] The present application aims to solve the technical problems in the prior art, and provides an automatic determination method and system for a full-reservoir seepage-prevention pumped storage reservoir dam site, which can automatically, accurately and efficiently select a dam site for a pumped storage power station, greatly reducing human judgment interference and being suitable for dam site determination in various terrain environments.

[0005] To achieve the above technical purposes, the present application adopts the following technical solutions:

[0006] An automatic determination method for a full-reservoir seepage-prevention pumped storage reservoir dam site, comprising the following steps:

[0007] S1, obtaining elevation information of a pumped storage power station and extracting contour lines of a topographic surface corresponding to the elevation of the hydropower station;

[0008] S2, selecting a contour line with the largest area range from the contour lines of the topographic surface extracted in step S1, which is surrounded by a closed contour line;

[0009] S3, generating a convex hull according to the contour lines selected in step S2;

[0010] S4. Connect the extreme points of the convex hull into multiple straight line segments l i , the extreme points cut the contour lines into multiple curve segments pl i , multiple straight line segments l i and multiple curve segments pl i Enclose i closed areas;

[0011] S5, selecting a closed area whose volume is greater than a preset value V;

[0012] S6. Get the closed area selected in step S5 and traverse the curve segment pl i Point j on the line segment l i Vertical line n j , calculate the perpendicular line n j Length h j , get the length h of the longest perpendicular line in each closed area ij max , calculate h ij max With the straight line segment l i The ratio k;

[0013] S7. Set a threshold a and select a closed area where k>a as the selected reservoir dam address.

[0014] Optionally, in step S2, the extracted contour lines include closed contour lines and unclosed contour lines, and the beginning and end points of the unclosed contour lines are connected to form closed contour lines, thereby obtaining a plurality of closed contour lines.

[0015] Optionally, step S3 is specifically as follows: obtaining a selected contour line, traversing each vertex on the contour line, and using the Jarvis March algorithm to continuously search for the farthest point in the counterclockwise direction of the current vertex to construct a convex hull until returning to the starting point to obtain a complete convex hull.

[0016] Optionally, in step S5, the area S of each closed area is calculated i , and calculate the volume V of each closed area based on the elevation information i , selected volume V i A closed area larger than a preset value V.

[0017] Optionally, in step S6, the Jarvis March algorithm is used to traverse the curve segment pl i Point j on .

[0018] Optionally, in step S7, the value of the threshold a is 0.75.

[0019] Optionally, the determination of the dam axis is further included, in particular:

[0020] P1, the closed area selected in the step S7 is acquired, and a curve segment pl 坝 and a straight line segment l 坝 of the closed area are determined.

[0021] P2, a point φ on the curve segment pl 坝 is traversed from one end point of the curve segment pl 坝 , the point φ and a next point φ+1 are connected to form a line segment u φ , a ray is made from the point φ in a direction parallel to the straight line segment l 坝 , an intersection point of the ray and the curve segment pl 坝 is φ 交 , the point φ and the intersection point φ 交 are connected to form a line segment v φ , when an included angle between the line segment u φ and the line segment v φ is greater than a preset angle β, the traversal is stopped, and the line segment v φ ' formed by the point and the intersection point when the included angle is greater than the preset angle β is reserved.

[0022] P3, simultaneously with the step P2, a point φ on the curve segment pl 坝 is traversed from another end point of the curve segment pl 坝 . The point and a next point are connected to form a line segment , a ray is made from the point in a direction parallel to the straight line segment l 坝 , an intersection point of the ray and the curve segment pl 坝 is , the point and the intersection point are connected to form a line segment , when an included angle between the line segment and the line segment is greater than a preset angle β, the traversal is stopped, and the line segment formed by the point and the intersection point when the included angle is greater than the preset angle β is reserved.

[0023] P4, the line segment v φ ' and the line segment are compared to a vertical distance of the straight line segment l 坝 , and the line segment with a shorter vertical distance is reserved as the dam axis.

[0024] Optionally, the preset angle β is 60°.

[0025] The present invention also provides a system for automatically determining the dam site of a full-reservoir anti-seepage pumped storage reservoir. The system uses the above-mentioned method for automatically determining the dam site of a full-reservoir anti-seepage pumped storage reservoir, including a contour line automatic generation module, a contour line automatic determination module, a convex hull algorithm module, a region division module, a region intelligent evaluation module, and a reservoir and dam address selection module.

[0026] The automatic contour generation module is used to obtain the elevation information of the pumped storage power station and extract the contour lines of the terrain surface corresponding to the elevation of the hydropower station;

[0027] The contour line automatic determination module is used to obtain the contour lines extracted by the contour line automatic generation module and select the contour line with the largest area range;

[0028] The convex hull algorithm module is used to generate the convex hull for the contour lines selected by the contour line automatic determination module;

[0029] The region partitioning module is used to connect the extreme points of the convex hull into multiple straight line segments l i , the extreme points cut the contour lines into multiple curve segments pl i , multiple straight line segments l i and multiple curve segments pl i Enclose i closed areas;

[0030] The regional intelligent evaluation module is used to select a closed area with a volume greater than a preset value V and traverse the curve segment pl for the selected closed area. i Point j on the line segment l i Vertical line n j , calculate the perpendicular line n j Length h j , get the length h of the longest perpendicular line in each closed area ij max , calculate h ij max With the straight line segment l i The ratio k;

[0031] The reservoir and dam address selection module is used to design the threshold a and select the closed area where k>a as the selected reservoir and dam address.

[0032] Optionally, a dam axis determination module is further included, which is used to obtain the closed area selected by the reservoir dam address selection module and traverse the points on the curve segment to obtain the dam axis.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The present invention achieves automated, accurate, and efficient site selection for pumped-storage power station reservoirs and dams by combining a convex hull algorithm with parametric calculation. This screening process greatly reduces the interference of human judgment and is applicable to dam site determination in various terrain environments.

[0035] (2) The present application uses Jarvis March algorithm, can traverse the point data on the contour line, construct complete convex hull, and determine the dam address by calculating the ratio of the longest vertical line of the closed area to the straight line segment, so that the selected dam address is more accurate and objective, and the subjectivity of traditional manual site selection is overcome;

[0036] (3) Based on the selected dam address, the present application selects two line segments with an included angle greater than a preset angle from the curve segment pl 坝 starting from two endpoints traversing the points on the curve segment pl 坝 at the same time, compares the perpendicular distances of the two line segments to the straight line segment l 坝 , and retains the line segment with a farther perpendicular distance as the dam axis, so that the dam axis obtained through accurate calculation is more accurate, avoids the error caused by manual calculation, reduces the workload, realizes the automatic, accurate and efficient determination of the pumped storage power station dam site and dam axis, greatly reduces the interference of human judgment, and is suitable for dam site determination in various terrain environments. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is the flow chart of the automatic determination method of the full-dam anti-seepage pumped storage dam site of the embodiment of the present application;

[0038] Figure 2 is the three-dimensional schematic diagram of the extracted contour line of the embodiment of the present application;

[0039] Figure 3 is the three-dimensional schematic diagram of the closed contour line of the embodiment of the present application;

[0040] Figure 4 is the convex hull schematic diagram of the embodiment of the present application;

[0041] Figure 5 is the closed area schematic diagram of the embodiment of the present application;

[0042] Figure 6 is the longest vertical line schematic diagram of the closed area of the embodiment of the present application;

[0043] Figure 7 is the dam axis determination schematic diagram of the embodiment of the present application. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0045] Example 1

[0046] Combine Figure 1 As shown, an embodiment of the present invention provides a method for automatically determining the dam site of a full-reservoir anti-seepage pumped storage reservoir, comprising the following steps:

[0047] S1. Obtain elevation information of the pumped storage power station and extract contour lines of the terrain surface corresponding to the elevation of the power station;

[0048] S2. Selecting the contour line with the largest area enclosed by closed contour lines from the contour lines of the terrain surface extracted in step S1;

[0049] S3, generating a convex hull according to the contour lines selected in step S2;

[0050] S4. Connect the extreme points of the convex hull into multiple straight line segments l i , the extreme points cut the contour lines into multiple curve segments pl i , multiple straight line segments l i and multiple curve segments pl i Enclose i closed areas;

[0051] S5, selecting a closed area whose volume is greater than a preset value V;

[0052] S6. Get the closed area selected in step S5 and traverse the curve segment pl i Point j on the line segment l i Vertical line n j , calculate the perpendicular line n j Length h j , get the length h of the longest perpendicular line in each closed area ij max , calculate h ij max With the straight line segment l i The ratio k;

[0053] S7. Set a threshold a and select a closed area where k>a as the selected reservoir dam address.

[0054] Example 2

[0055] An embodiment of the present invention provides a method for automatically determining the dam site of a full-reservoir anti-seepage pumped storage reservoir, comprising the following steps:

[0056] S1. Obtain elevation information of the pumped storage power station and extract contour lines of the terrain surface corresponding to the elevation of the power station;

[0057] S2. Selecting the contour line with the largest area enclosed by closed contour lines from the contour lines of the terrain surface extracted in step S1;

[0058] S3, generating a convex hull according to the contour selected in step S2;

[0059] S4, connecting the pole points of the convex hull into a plurality of straight line segments l i , the pole points truncating the contour into a plurality of curve segments pl i , the plurality of straight line segments l i and the plurality of curve segments pl i enclosing i closed regions;

[0060] S5, selecting a closed region with a volume greater than a preset value V;

[0061] S6, obtaining the closed region selected in step S5, traversing points j on the curve segment pl i , drawing a perpendicular line n i from the point j to the straight line segment l j , calculating the length h j of the perpendicular line n j , obtaining the length h ij of the longest perpendicular line of each closed region; max ij max and the ratio k of h i to the straight line segment l

[0062] Specifically, as shown in Figure 6 , the longest perpendicular lines of the closed regions ①, ② and ③ with a volume greater than the preset value V are taken as examples.

[0063] S7, setting a threshold value a, and selecting a closed region with k > a as a selected dam address;

[0064] On this basis, in the present embodiment, in step S2, the extracted contours include closed contours and unclosed contours, the unclosed contours are connected at the head and tail points to form a closed contour, and a plurality of closed contours are obtained;

[0065] Specifically, as shown in Figure 2 and Figure 3 , assuming that the extracted contours include a closed contour F and an unclosed contour G, the unclosed contour is connected at the head and tail points (i.e., the head and tail points of the contour are connected along the dashed line H), and two closed contours F and G' are obtained.

[0066] As a preferred manner, in step S3, the specific method of generating the convex hull is: obtaining the selected contour, traversing each vertex on the contour, and using the Jarvis March algorithm to constantly find the farthest point in the counterclockwise direction of the current vertex to construct the convex hull until returning to the starting point, and obtaining the complete convex hull;

[0067] Further, in step S5, the area S i, and calculate the volume V of each closed area based on the elevation information i , selected volume V i The enclosed area is larger than the preset value V; the specific enclosed area area calculation process and volume calculation process are prior art and will not be described in detail here; in this embodiment, Figure 6 As shown, the volume V i The closed areas larger than the preset value V are ①②③ closed areas.

[0068] Specifically, if Figure 4 As shown, assuming that the selected contour line is G', traverse each vertex on the contour line until returning to the starting point to obtain the complete convex hull;

[0069] like Figure 5 As shown, the extreme points of the convex hull are connected into multiple straight line segments l i , the extreme points cut the contour lines into multiple curve segments pl i , multiple straight line segments l i and multiple curve segments pl i i closed areas are enclosed. In this embodiment, 7 closed areas are enclosed.

[0070] As a preferred method, in step S5, the Jarvis March algorithm is used to traverse the curve segment pl i Point j on .

[0071] As a preferred embodiment, the value of the threshold a may be 0.75.

[0072] Example 3

[0073] An embodiment of the present invention provides a method for automatically determining the dam site of a full-reservoir anti-seepage pumped storage reservoir, comprising the following steps:

[0074] S1. Obtain elevation information of the pumped storage power station and extract contour lines of the terrain surface corresponding to the elevation of the power station;

[0075] S2. Selecting the contour line with the largest area enclosed by closed contour lines from the contour lines of the terrain surface extracted in step S1;

[0076] S3, generating a convex hull according to the contour lines selected in step S2;

[0077] S4. Connect the extreme points of the convex hull into multiple straight line segments l i , the extreme points cut the contour lines into multiple curve segments pl i , multiple straight line segments l i and multiple curve segments pl i Enclose i closed areas;

[0078] S5, selecting a closed area whose volume is greater than a preset value V;

[0079] S6. Get the closed area selected in step S5 and traverse the curve segment pl i Point j on the line segment l i Plumb line n j , calculate the perpendicular line n j Length h j , get the length h of the longest perpendicular line in each closed area ij max , calculate h ij max With the straight line segment l i The ratio k;

[0080] S7, setting a threshold a, and selecting a closed area where k>a as the selected reservoir dam address;

[0081] On this basis, in this embodiment, the method for automatically determining the dam site of the full-reservoir anti-seepage pumped storage reservoir also includes determining the dam axis, specifically:

[0082] P1, obtain the closed area selected in step S7, the curve segment pl of the closed area 坝 , the straight line segment is l 坝 ;

[0083] P2, from the curve segment pl 坝 One endpoint traverses the curve segment pl 坝 Point φ on the line is connected to the next point φ+1 by a line segment u. φ , from point φ to a line parallel to the line segment l 坝 Make a ray in the direction of the curve segment pl 坝 The intersection point is φ 交 , point φ and intersection point φ 交 Connect into line segment v φ , when line segment u φ With line segment v φ When the angle between the two points is greater than the preset angle β, stop traversing and keep the line segment v formed by the point where the angle is greater than the preset angle β and the intersection point. φ ';

[0084] P3, and step P2 at the same time, from the curve segment pl 坝 The other endpoint traverses the curve segment pl 坝 Point on point With the next point Connect into line segments From point Parallel to the straight line segment l 坝 Make a ray in the direction of the curve segment pl 坝 The intersection point is point With intersection point Connect into line segment When line segment The angle between line segment Greater than the preset angle β, stop traversal, keep the line segment connected by the point and intersection point when the angle is greater than the preset angle β

[0085] P4, compare line segment Line segment To the vertical distance of straight line segment l 坝 , keep the line segment with shorter vertical distance as the dam axis;

[0086] Specifically, as shown in Figure 7 The angle between line segment And line segment Is α, at this time α>β, keep line segment The angle between line segment And line segment Is α', at this time α'>β, keep line segment Compare line segment Line segment To the vertical distance of straight line segment l 坝 , keep the line segment with shorter vertical distance as the dam axis.

[0087] Wherein, the value of the preset angle β can be 60°.

[0088] Embodiment 4

[0089] The embodiment of the application also provides an automatic determination system for a full-bank anti-seepage pumped storage power station dam site, which is suitable for the automatic determination method for the full-bank anti-seepage pumped storage power station dam site as described above, and comprises a contour line automatic generation module, a contour line automatic determination module, a convex hull algorithm module, a region division module, a region intelligent evaluation module and a power station dam site selection module.

[0090] The contour line automatic generation module is used to obtain the elevation information of the pumped storage power station, and extract the contour line of the topographic surface corresponding to the elevation of the hydropower station;

[0091] The contour line automatic determination module is used to obtain the contour line extracted by the contour line automatic generation module, and select the contour line with the largest area range;

[0092] The convex hull algorithm module is used to generate a convex hull for the contour line selected by the contour line automatic determination module;

[0093] The region division module is used to connect the extreme points of the convex hull into a plurality of straight line segments l i , the extreme points truncate the contour line into a plurality of curve segments pl i , and the plurality of straight line segments l i And the plurality of curve segments pli enclose i closed regions;

[0094] The region intelligence evaluation module is used to select the closed regions with the volume greater than the preset value V, and traverse the points j on the curve segment pl of the selected closed regions i from the point j to the straight line segment l i , draw the perpendicular line n j , calculate the length h of the perpendicular line n j , obtain the length h of the longest perpendicular line of each closed region j ij max , calculate the ratio k of h ij max to the straight line segment l i ;

[0095] The dam address selection module is used to design a threshold value a, and select the closed regions with k>a as the selected dam addresses;

[0096] Further, the dam axis determination module is further included, which is used to obtain the closed regions selected by the dam address selection module, and traverse the points on the curve segment to obtain the dam axis.

[0097] The above merely describes the embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement and improvement within the scope of the present application should be included in the protection scope of the present application.​

Claims

1. A method for automatically determining a full-bank anti-seepage pumped storage dam site, characterized in that, The method comprises the following steps: S1, obtaining the elevation information of the pumped storage power station, and extracting the contour lines of the topographic surface corresponding to the elevation of the hydropower station; S2, selecting the contour line with the largest area range from the contour lines of the topographic surface extracted in step S1; S3, generating a convex hull according to the contour line selected in step S2; S4, connecting the pole points of the convex hull into a piecewise straight line segment l i , the pole points truncate the contour into a piecewise curved segment pl i , the piecewise straight line segment l i and the piecewise curved segment pl i enclose i closed regions; S5, selecting a closed area with a volume greater than a preset value V; S6. Get the closed area selected in step S5 and traverse the curve segment pl i Point j on the line segment l i Plumb line n j , calculate the perpendicular line n j Length h j , get the length h of the longest perpendicular line in each closed area ij max , calculate h ij max With the straight line segment l i The ratio k; S7, setting a threshold value a, and selecting a closed area with k>a as the selected reservoir dam address.

2. The method for automatic determination of a dam site for a full-bank anti-seepage pumped storage bank, according to claim 1, characterized in that, In step S2, the extracted contour lines include closed contour lines and unclosed contour lines. The unclosed contour lines are connected from the head point to the tail point to form closed contour lines, and a plurality of closed contour lines are obtained.

3. The method for automatic determination of a dam site for a full-bank anti-seepage pumped storage bank, according to claim 1, characterized in that, Step S3 is specifically: obtaining the selected contour line, traversing each vertex on the contour line, and using the Jarvis March algorithm to constantly find the farthest point in the counterclockwise direction of the current vertex to construct the convex hull, until returning to the starting point, and obtaining the complete convex hull.

4. The method for automatic determination of a dam site for a full-bank anti-seepage pumped storage bank, according to claim 1, characterized in that, In step S5, the area S of each closed region is calculated i and the volume V of each closed region is calculated from the elevation information i The closed regions for which the volume V i is greater than a preset value V are selected.

5. The method for automatic determination of a dam site for a full-bank anti-seepage pumped storage bank, according to claim 1, characterized in that, In step S6, the Jarvis March algorithm is used to traverse the curve segment pl i to find the point j.

6. The method for automatic determination of a dam site for a full-bank anti-seepage pumped storage bank, according to claim 1, characterized in that, In step S7, the threshold value a is 0.

75.

7. The method for automatic determination of a dam site for a full-bank anti-seepage pumped storage bank, according to claim 1, characterized in that, Further comprising determination of the dam axis, specifically: P1, the curve segment pl of the closed area selected in the step S7 坝 , the straight line segment is l 坝 ; P2, traverse the curve segment pl from an end point of the curve segment pl 坝 坝 φ 坝 坝 交 交 φ φ φ φ when the included angle of the line segment u and the line segment v is greater than the preset angle β, stop the traversal, and retain the line segment v connected by the point and the intersection point when the included angle is greater than the preset angle β​​​​​​​​​​ P3, simultaneously with step P2, traversing the curve segment pl 坝 from the other end point of the curve segment pl 坝 to the point on the curve segment pl connecting the point with the next point into a line segment making a ray from the point in a direction parallel to the straight line segment l 坝 the intersection point of the ray with the curve segment pl 坝 is the point connecting the point with the intersection point into a line segment stopping the traversal when the angle between the line segment and the line segment P4, comparison line segment line segment to the perpendicular distance to the straight line segment l 坝 the shorter one as the dam axis.

8. The method for automatic determination of a dam site for a full-bank anti-seepage pumped storage bank, according to claim 7, characterized in that, The preset angle β is 60°.

9. An automatic determination system of a full-bank anti-seepage pumped storage power station dam site, characterized in that, The method is suitable for automatically determining the full-reservoir impervious pumped storage reservoir dam site according to any one of claims 7-8, comprising a contour line automatic generation module, a contour line automatic determination module, a convex hull algorithm module, a region division module, a region intelligent evaluation module, and a reservoir dam address selection module; The contour line automatic generation module is used to obtain the elevation information of the pumped storage power station, and extract the contour lines of the topographic surface corresponding to the elevation of the hydropower station; The contour line automatic determination module is used to obtain the contour lines extracted by the contour line automatic generation module, and select the contour line with the largest area range; The convex hull algorithm module is used to generate a convex hull for the contour line selected by the contour line automatic determination module; The region division module is configured to connect the pole points of the convex hull into a plurality of straight line segments l i , the pole points truncate the contour line into a plurality of curve segments pl i , the plurality of straight line segments l i and the plurality of curve segments pl i surround i closed regions; The regional intelligent evaluation module is used to select a closed area with a volume greater than a preset value V and traverse the curve segment pl for the selected closed area. i Point j on the line segment l i Plumb line n j , calculate the perpendicular line n j Length h j , get the length h of the longest perpendicular line in each closed area ij max , calculate h ij max With the straight line segment l i The ratio k; The reservoir dam address selection module is used to set a threshold value a, and select a closed area with k>a as the selected reservoir dam address.

10. The automatic determination system of the dam site of the full library anti-seepage pumped storage library according to claim 9, characterized in that, Further comprising a dam axis determination module, which is used to obtain the closed area selected by the reservoir dam address selection module, traverse the points on the curve segment to obtain the dam axis.

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