CN107871041A - The grid processing method of basin complicated landform - Google Patents
The grid processing method of basin complicated landform Download PDFInfo
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- CN107871041A CN107871041A CN201711080796.6A CN201711080796A CN107871041A CN 107871041 A CN107871041 A CN 107871041A CN 201711080796 A CN201711080796 A CN 201711080796A CN 107871041 A CN107871041 A CN 107871041A
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Abstract
The present invention provides a kind of grid processing method of basin complicated landform, can realize grid specification, rationalization and the simplification processing of complicated landform, it is characterised in that including：(1) grid processing method that the Heavenly Stems and Earthly Branches are flowed at remittance mouth：River course relation in research range is identified, trunk branch fluid stream channel is marked off and segment processing is carried out to river course；Draw the two-dimensional grid in mainstream and tributary in basin perimeter respectively by section, obtain the two-dimensional grid data of each section；Further according to landform tendency and its enter neighbouring relations at remittance, judge that stitching position simultaneously realizes that the Heavenly Stems and Earthly Branches flow into and converges the smooth splicing of mouth grid；(2) grid processing method of river course drastically contraction place；(3) grid processing method at Pear-Shaped river course；(4) the ears of an ox or cow lake in right angle enters the grid processing method at remittance with branch：To the grid drawing in research range locally T-shaped grid mutually to splice.
Description
Technical field
The invention belongs to hydrodynamics and environmental simulation field, and in particular to a kind of grid processing side of basin complicated landform
Method.
Technical background
Grid is that progress finite element numerical, which becomes more meticulous, simulates the premise of calculating by integral unit discretization.With the modern times two
The continuous development of three-dimensional hydrodynamic force water quality model, can usually run into that zoning landform boundary shape is complicated, zoning is larger
And different area grid resolution requirements not parity problem.In order to carry out the flow circulation under MODEL OVER COMPLEX TOPOGRAPHY, neither
The minutia and can for losing landform reduces the data volume of computing, can be adaptive with water flow advance dynamic change structured grid
Algorithm, and according to the local cypher of mesh adaption criterion and thinization grid, ensure that model takes between computational efficiency and solving precision
It must balance, be an important technological difficulties in current fluid Mechanics Calculation, while be also current environment management and sunykatuib analysis
The major issue that research institute faces.
The demand that basin-wide water environment calculates, constantly extended from single river channel to Complex River.Usual landform is more homogeneous
Section grid processing method be using existing grid drawing instrument generation be adapted to discrete values calculating rule mesh
Lattice, and two dimensional surface rectangular coordinate system is used, painted using due east direction by X-axis (i directions), by Y-axis (j directions) of direct north
The grid of system.But for exist main stem it is narrow but enter to converge wide mouth, quarter bend and U-shaped curved, the ears of an ox or cow lake, river course drastically shrink, the ears of an ox or cow
Lake exist enter converge the river with complicated landform such as branch grid processing still have many difficulties.According to the irregular spy of topography variation
Put and be actually needed, for the huge section of topography variation, its section grid processing is most important, if grid must not handle
When main grid direction is mismatched with river topography, then Flow Numerical Simulation under MODEL OVER COMPLEX TOPOGRAPHY can not be overcome to face calculating not
The problems such as stable and form concordance difference.
The content of the invention
The present invention is, and it is an object of the present invention to provide at a kind of grid of basin complicated landform in order to solving the above problems and carry out
Reason method, this method can be based on existing two-dimensional regular grid method for drafting, and watershed extreme terrain fine grid blockses are divided
Section is drawn, deletes benefit, splicing, adjustment, refine, grid specification, rationalization and the simplification processing of complicated landform is realized, for processing
The numerical simulation calculation of the watershed units that complicate provides reference and technical support more.
The present invention to achieve these goals, employs following scheme：
The present invention provides a kind of grid processing method of basin complicated landform, it is characterised in that including：
(1) grid processing method that the Heavenly Stems and Earthly Branches are flowed at remittance mouth
River course relation in research range is identified, trunk branch fluid stream channel is marked off and river course is carried out at segmentation
Reason；Using grid drawing instrument, the two-dimensional grid in mainstream and tributary in basin perimeter is drawn respectively by section, obtain each section
Two-dimensional grid data；Further according to landform tendency and its enter neighbouring relations at remittance, judge that stitching position simultaneously realizes that the Heavenly Stems and Earthly Branches flow into
The smooth of mouth grid that converge splices；
(2) grid processing method of river course drastically contraction place
The river course relation in research range is identified according to river topography, realizes that grid is painted using grid drawing instrument
System, splicing and refine processing；
(3) grid processing method at Pear-Shaped river course
The grid in research range is drawn according to river topography, local thinization or encryption, refine are handled；
(4) the ears of an ox or cow lake in right angle enters the grid processing method at remittance with branch
According to river course actual landform, to the grid drawing in research range, locally T-shaped grid is mutually to splice, so as to real
Existing network lattice homogenization on the whole and standardization.
The grid processing method of basin complicated landform provided by the invention, there can also be following characteristics：
(1) grid processing method that the Heavenly Stems and Earthly Branches are flowed at remittance mouth comprises the following steps：
Step 1-1. Heavenly Stems and Earthly Branches streams generate grid respectively：
Draw the two-dimentional regular rectangular lattice of Heavenly Stems and Earthly Branches stream section respectively using grid drawing instrument, grid entirety is represented with L
Density, m and n represent the grid number in i and j directions respectively, then the n in mainstream and tributary should be identical, and the net of Heavenly Stems and Earthly Branches stream intersection
Lattice must be completely overlapped；
Step 1-2. examines grid orthogonality：
After finishing grid, clicking on fitting border makes grid be coincide with border, then clicks on grid property → orthogonalization grid
To examine grid orthogonality, orthogonality is weighed with cosine value, is corresponding with the cosine for boundary 1-2 row's grids that branch is flowed at remittance
For value no more than 0.05, the cosine value of remaining grid should be less than 0.02；If grid orthogonality is undesirable, click editor →
Orthogonalization grid improves grid orthogonality, if still not up to requiring, return to step 1-1 by trimming-wire regenerates net
Lattice, untill grid meets to require；
Step 1-3. Heavenly Stems and Earthly Branches stream trellis is spliced：
Checked by compareing actual landform to differentiate that branch is connected on mainstream or on tributary, to determine to augment grid
Direction,, will be dry using the old grid of grid → stickup is augmented to new grid until the grid of drafting all covers in actual river course
Branch stream trellis is connected together, and examines whether Heavenly Stems and Earthly Branches drift net ruling is completely superposed, and the grid to not overlapping adjusts accordingly.
The grid processing method of basin complicated landform provided by the invention, there can also be following characteristics：
(2) drastically contraction place grid processing method comprises the following steps in river course：
Step 2-1. is according to terrain generation grid：
Line is drawn along Heavenly Stems and Earthly Branches stream direction according to actual landform, generated according to line orthogonal in length and breadth using mess generation instrument
Grid, and cosine value of the examination and adjustment orthogonality until grid intersecting lens of being modified to grid is literary less than 0.02, then by grid
Part encloses topographic(al) data generation terrain result file, and the terrain result file of generation, contrast are opened using tecplot softwares
The terrain result file opened in tecplot, the grid in Delft3d is carried out to delete benefit, until border is all covered by grid
Cover and grid is no more than 2 rows outside river course；
Grid thinization at step 2-2. local contractions：
The grid of contraction place should as far as possible it is sparse its substantially into square, clicking operation → thinization grid is by grid office
Portion's thinization, it should be particularly noted that the grid at river course turning can not be overstocked, must not gross distortion growth rectangle, length-width ratio should not surpass
1.5 are crossed, to prevent tying down sequential operation speed；
The branch grid splicing of step 2-3. tributaries：
By river course drastically broadening place be considered as tributary branch enter to converge mouth, choose into the similar net of density degree at remittance mouth
Lattice, line is drawn along the boundary line of the well-graded grid in this, regenerates grid, the grid number of generation will be with the grid number of selection
It is identical, realized and spliced by paste tool after adjusting the grid of generation and being completely superposed with the grid chosen.
The grid processing method of basin complicated landform provided by the invention, there can also be following characteristics：
(3) Pear-Shaped river course grid processing method comprises the following steps：
Step 3-1. is according to terrain generation grid：
, it is necessary to draw the place that single line most shrinks in river course when line regeneration grid is originally drawn, the 2 of both sides
The orthogonal line of block is distributed in fan-shaped, then generates grid, adjusts the position of line to adjust grid so that be by paracentral grid
Length is than the wide rectangle for being no more than 1.5 and attention and the transition and linkage of upper and lower grid；
Thinization of step 3-2. contraction places grid：
The center section in Pear-Shaped river course and the grid at river course turning can not be overstocked, need to carry out local thinization processing,
Clicking operation → thinization grid is by local thinization of grid so that length-width ratio is no more than 1.5 after grid partial enlargement；
Step 3-3. is segmented the splicing of grid：
On the basis of a coincidence line of two segment mesh, choose into the roughly equal grid of sizing grid at remittance mouth, along
Line regeneration grid is drawn in the boundary line of the well-graded grid in this, and the grid number of generation is identical with the grid number of selection, adjusts
The grid of whole generation is realized after being completely superposed with the grid chosen by paste tool to be spliced.
The grid processing method of basin complicated landform provided by the invention, there can also be following characteristics：In step 3-2
In, the center section in Pear-Shaped river course and the single grid area at river course turning should not be less than the 25% of major trunk roads.
The grid processing method of basin complicated landform provided by the invention, there can also be following characteristics：
(4) band branch in right angle the ears of an ox or cow lake enters grid processing method at remittance and comprised the following steps：
Step 4-1. tributaries generate grid respectively with branch：
Grid is generated using T-shaped phase connection respectively, i.e., draws two groups along main stem direction and the ears of an ox or cow lake right angle Ru Hui directions
Line, make its mutually orthogonal, actual landform situation is generalized as a T-shaped, then unified generation grid；
Thinization of step 4-2. Local grids：
Grid can not be excessively intensive at momentum model, and clicking operation → thinization grid is by local thinization of grid so that grid
Length-width ratio is no more than 1.5 after partial enlargement；
Step 4-3. is segmented the splicing of grid：
On the basis of a coincidence line of two segment mesh, choose into the similar grid of density degree at remittance mouth, along this portion
Line is drawn in the boundary line of well-graded grid, regenerates grid, and the grid number of generation is identical with the grid number of selection, adjustment life
Into grid with choose grid be completely superposed after by paste tool realize splice.
The effect of invention and effect
Compared with prior art, the beneficial effects of the present invention are：
(1) existing grid drawing software is based on, on the basis of the drafting of its grid that can be completed amount, by being answered with basin
Miscellaneous landform compares, and realizes that grid match with rationalizations of river course actual landform and the Heavenly Stems and Earthly Branches flow into the smoothness of remittance mouth grid and spelled
Connect.
(2) drastically shunk for river course, at " Pear-Shaped " river course and right angle the ears of an ox or cow lake with branch enter the deformation of grid at remittance,
The problems such as local density degree differs, mismatched with actual landform, realize become more meticulous grid and basin actual landform reasonable
Match somebody with somebody, improve the accuracy and reasonability of simulation.
(3) grid can use for a long time after disposably drawing, and can be that the numerical simulation calculation of the processing watershed units that complicate carries more
For important reference value and technical support.
Brief description of the drawings
Fig. 1 is the flow chart of grid processing method in the embodiment of the present invention；
Fig. 2 is the topographic map that the complicated section Heavenly Stems and Earthly Branches flow into remittance mouth in the embodiment of the present invention；
Fig. 3 is that the Heavenly Stems and Earthly Branches after being handled in the embodiment of the present invention flow into remittance mouth grid chart；
Fig. 4 is the topographic map of river course drastically contraction place in the embodiment of the present invention, wherein, (a) is Daning River mainstream contraction place
Topographic map, (b) be Daning River tributary contraction place topographic map；
Fig. 5 is the river course drastically contraction place grid chart after being handled in the embodiment of the present invention；
Fig. 6 is the topographic map in Pear-Shaped river course in the embodiment of the present invention；
Fig. 7 is " Pear-Shaped " river course grid chart after being handled in the embodiment of the present invention；
Fig. 8 is topographic map of the right angle the ears of an ox or cow lake with branch in the embodiment of the present invention；
Fig. 9 is the right angle the ears of an ox or cow lake band branch grid chart after being handled in the embodiment of the present invention.
Embodiment
The grid processing method of basin complicated landform of the present invention is described in detail below in conjunction with accompanying drawing.
<Embodiment>
As shown in figure 1, the grid processing method for the basin complicated landform that the present embodiment is provided includes herein below：
(1) Heavenly Stems and Earthly Branches flow into remittance mouth grid processing method
The Heavenly Stems and Earthly Branches flow into remittance mouth grid processing method, refer to the complex tributary of watershed unit and the drafting of grid at mainstream
Grid processing method with splicing and meeting actual landform situation, this method specifically include following steps：
1. Heavenly Stems and Earthly Branches stream generates grid respectively：As shown in Fig. 2 entering to converge landform at mouth according to Heavenly Stems and Earthly Branches stream section, net is utilized
Lattice drawing tool (Delft 3D) draws the two-dimentional regular rectangular lattice of Heavenly Stems and Earthly Branches stream section respectively, using draw 30 × 30 grid as
Example, can first generate 6 × 6 grid, spines (line) regeneration grids are adjusted according to generated grid, click on view (depending on
Figure)-grid properties (grid property)-orthogonality (orthogonalization) inspection grid orthogonalities, it is in general remaining
String value is less than 0.02, and very close to 1~2 row's grid on border, cosine value is considered as acceptable higher than this standard.Click on again
Operations (operation)-Refine grid (refined net), are integrally encrypted in a manner of 5 × 5, can obtain 30 × 30
Grid.
2. examine grid orthogonality：After finishing grid, edit (editor)-line to land boundary (fittings are clicked on
Border) cause grid to try one's best with border.Concrete operations are that left mouse button is chosen on boundary mesh a bit, on right button grid
It is another, it is allowed to coincide with border.After the completion of above step, view (view)-grid properties (grid category is clicked on
Property)-orthogonality (orthogonalization grid) to be to examine grid orthogonality.Orthogonality is weighed by the cosine value of grid intersecting lens,
In general the cosine value of body region grid is less than 0.02, is corresponding with boundary 1-2 row's grids (border that branch is flowed at remittance
Area grid) cosine value no more than 0.05.If grid orthogonality is undesirable, operations (behaviour can be clicked on
Making)-orthogonalise grid (orthogonalization grid) improve grid orthogonality.If wanting for orthogonality is not up to after clicking on
Ask, then need to return to step 1, grid is regenerated by finely tuning splines (line), untill grid meets to require.
3. Heavenly Stems and Earthly Branches stream trellis is spliced：Want clear and definite branch to be connected on mainstream or on direct current, be easy to determine supplement net
The direction of lattice, this, which needs to compare actual landform, checks, can load landform scatterplot or by Google Earth (Google
Figure) check, such as when drawing the grid of the Changjiang river Daning River, because Daning River enters to converge mouth in Wushan County, branch, which belongs to the Changjiang river, to be done
Stream, so augmenting this block grid needs along mainstream direction, until the grid of drafting all covers in actual river course.Utilize
AddSubDe (supplement grid) → Paste passive grid to grid (pasting old grid to new grid), by Heavenly Stems and Earthly Branches drift net
Lattice are connected together, and examine coincidence situation and make corresponding adjustment, and final effect is as shown in Figure 3.
(2) river course drastically contraction place grid processing method
River course drastically contraction place grid processing method, be river course somewhere close to shrinking at double, almost without crossing
Grid processing method, this method specifically includes following steps：
1. according to terrain generation grid：As shown in figure 4, according to river course Ji Ju contraction places terrain rendering splines (line), root
According to splines (line) orthogonal in length and breadth grid and examination and adjustment orthogonality of being modified to grid are generated using mess generation instrument
Until the cosine value of grid intersecting lens is less than 0.02, grid file is enclosed topographic(al) data generation landform by recycling computer program
Destination file, the terrain result file of generation is opened using tecplot, contrast the terrain result file opened in tecplot, it is right
Grid in Delft3d carries out deleting benefit, until border is all covered and grid is no more than 2 rows outside river course by grid.
2. grid thinization at local contraction：The distortion of the mesh of river course contraction place is more serious, it is likely that long rectangle occurs
Grid, and the grid of contraction place should as far as possible it is sparse its substantially into square, can click on Operations (operation) →
Local thinization of grid, concrete operations are click on Options (option) → Change by Derefine grid (thinization grid)
In same grid after click Derefine grid (thinization grid) after parameters (arrange parameter) setting density parameters
Click on line at 2 points, can be by local thinization of this segment mesh.
It should be particularly noted that turn mouth place grid can not be overstocked, to prevent tie down program calculate, and must not deform seriously into
Long rectangle.
3. tributary branch grid splices：By river course drastically broadening place be considered as tributary branch enter to converge mouth, choose into remittance
Density degree identical grid drawing splines (line) regenerations grid at mouthful, the grid number of generation will be with the grid number of selection
It is identical, splicing, final effect are realized by paste (stickups) instrument after adjusting the grid of generation and being completely superposed with the grid chosen
As shown in Figure 5.
(3) " Pear-Shaped " river course grid processing method
" Pear-Shaped " river course grid processing method, refer to that river topography presentation both sides are more uniform, middle somewhere is received suddenly
Grid processing method in the case of contracting (being in " Pear-Shaped "), this method specifically include following steps：
1. according to terrain generation grid：As shown in fig. 6, the place that a spline (line) is most shunk in river course is drawn, two
Side is distributed in fan-shaped, and grid is generated using existing instrument (Delft3D), is that rectangle is (but general long than wide by submedial grid
No more than 1.5) and paying attention to being connected with the excessive of upper and lower grid.
2. thinization of contraction place grid：Segment mesh can not mistake with turning mouth for center section and river course for Pear-Shaped river course
Close (the 25% of major trunk roads should not be less than by requiring the single grid area at intensive place), local thinization processing, Ke Yidian need to be carried out
Operations (operation) → Derefine grid (thinization grid) are hit to be click on local thinization of grid, concrete operations
After Options → Change parameters setting density parameters after click Derefine grid on same grid lines
Click at 2 points, can be by local thinization of this segment mesh so that partial enlargement can not be in obvious long rectangle, and general length-width ratio can not
More than 1.5.
3. it is segmented the splicing of grid：On the basis of a coincidence line of two segment mesh, two segment mesh respectively take it is a bit of connect,
As final overlapping grid, the splicing of segmentation grid is realized, as shown in Figure 7.
(4) right angle the ears of an ox or cow lake band branch grid processing method
It is to be rectangular in shape for tributary branch into remittance that right angle the ears of an ox or cow lake band branch, which enters grid processing method at remittance, and main stem
Landform is narrower, and the overstocked grid processing method of river course central gridding, this method specifically include following steps caused by：
1. tributary generates grid respectively with branch：Two continuous the ears of an ox or cow lakes, and the two the ears of an ox or cows be present in Daning River upstream
Lake is all right-angled bend, as shown in figure 8, because main stem is narrower, there will necessarily be many grids at lake center, causes this section
Amount of calculation is larger, and easily occurs in corner deforming more serious grid.Grid is generated using T-shaped phase connection respectively,
Splines (line) twice is drawn along main stem direction and the ears of an ox or cow lake right angle Ru Hui directions, makes its mutually orthogonal, by actual landform feelings
Condition is generalized as a T-shaped, then unified generation grid.
2. thinization of Local grid：Grid can not be excessively intensive at momentum model, and local thinization is carried out using existing instrument
Processing, Operations (operation) → Derefine grid (thinization grid) can be clicked on by local thinization of grid, concrete operations
It is click on clicking on Derefine after Options (option) → Change parameters (arrange parameter) set density parameter
Click on same grid lines at 2 points after grid (thinization grid), can be by local thinization of this segment mesh so that grid is local
It is not obvious long rectangle after amplification, general length-width ratio is no more than 1.5.
3. it is segmented the splicing of grid：On the basis of a coincidence line of two segment mesh, choose into density degree phase at remittance mouth
As grid, draw splines (line) regeneration grids along the boundary line of the well-graded grid in this, the grid number of generation will
It is identical with the grid number of selection, as shown in Figure 9.
Above example is only the illustration done to technical solution of the present invention.Basin involved in the present invention is complicated
The grid processing method of landform is not merely defined in content described in the embodiment above, but is limited with claim
Fixed scope is defined.Any modification that those skilled in the art of the invention are made on the basis of the embodiment or supplement wait
Effect is replaced, all in the claimed scope of the claim of the present invention.
Claims (6)
- A kind of 1. grid processing method of basin complicated landform, it is characterised in that including：(1) grid processing method that the Heavenly Stems and Earthly Branches are flowed at remittance mouthRiver course relation in research range is identified, trunk branch fluid stream channel is marked off and segment processing is carried out to river course；Profit With grid drawing instrument, the two-dimensional grid in mainstream and tributary in basin perimeter is drawn respectively by section, obtain the two of each section Tie up grid data；Further according to landform tendency and its enter neighbouring relations at remittance, judge that stitching position simultaneously realizes that the Heavenly Stems and Earthly Branches flow into and converges mouth The smooth splicing of grid；(2) grid processing method of river course drastically contraction placeThe river course relation in research range is identified according to river topography, using grid drawing instrument realize grid drawing, Splicing and refine processing；(3) grid processing method at Pear-Shaped river courseThe grid in research range is drawn according to river topography, local thinization or encryption, refine are handled；(4) the ears of an ox or cow lake in right angle enters the grid processing method at remittance with branchAccording to river course actual landform, to the grid drawing in research range, locally T-shaped grid is mutually to splice, so as to realize net Lattice homogenization on the whole and standardization.
- 2. the grid processing method of basin complicated landform according to claim 1, it is characterised in that：Wherein, the grid processing method that (1) Heavenly Stems and Earthly Branches are flowed at remittance mouth comprises the following steps：Step 1-1. Heavenly Stems and Earthly Branches streams generate grid respectively：Draw the two-dimentional regular rectangular lattice of Heavenly Stems and Earthly Branches stream section respectively using grid drawing instrument, grid global density represented with L, M and n represents the grid number in i and j directions respectively, then the n in mainstream and tributary should be identical, and the grid of Heavenly Stems and Earthly Branches stream intersection is necessary It is completely overlapped；Step 1-2. examines grid orthogonality：After finishing grid, clicking on fitting border makes grid be coincide with border, then clicks on grid property → orthogonalization grid to examine Grid orthogonality is tested, orthogonality is weighed with cosine value, is corresponding with the cosine value for boundary 1-2 row's grids that branch is flowed at remittance not Preferably more than 0.05, the cosine value of remaining grid should be less than 0.02；If grid orthogonality is undesirable, click editor → orthogonal Change grid to improve grid orthogonality, if still not up to requiring, return to step 1-1 regenerates grid by trimming-wire, directly Untill grid meets to require；Step 1-3. Heavenly Stems and Earthly Branches stream trellis is spliced：Checked by compareing actual landform to differentiate that branch is connected on mainstream or on tributary, to determine to augment the side of grid To, until drafting grid by actual river course all cover, using the old grid of grid → stickup is augmented to new grid, by Heavenly Stems and Earthly Branches stream Grid is connected together, and examines whether Heavenly Stems and Earthly Branches drift net ruling is completely superposed, and the grid to not overlapping adjusts accordingly.
- 3. the grid processing method of basin complicated landform according to claim 1, it is characterised in that：Wherein, drastically contraction place grid processing method comprises the following steps in (2) river course：Step 2-1. is according to terrain generation grid：Line is drawn along Heavenly Stems and Earthly Branches stream direction according to actual landform, mess generation instrument generation net is utilized according to line orthogonal in length and breadth Lattice, and examination and adjustment orthogonality of being modified to grid is until the cosine value of grid intersecting lens is less than 0.02, then by grid file Topographic(al) data generation terrain result file is enclosed, the terrain result file of generation, contrast are opened using tecplot softwares The terrain result file opened in tecplot, the grid in Delft3d is carried out to delete benefit, until border is all covered by grid Cover and grid is no more than 2 rows outside river course；Grid thinization at step 2-2. local contractions：The grid of contraction place substantially should locally dredge grid into square, clicking operation → thinization grid sparse its as far as possible Change, it should be particularly noted that the grid at river course turning can not be overstocked, must not gross distortion growth rectangle, length-width ratio no more than 1.5, to prevent tying down sequential operation speed；The branch grid splicing of step 2-3. tributaries：By river course drastically broadening place be considered as tributary branch enter to converge mouth, choose into the similar grid of density degree at remittance mouth, Line is drawn along the boundary line of the well-graded grid in this, regenerates grid, the grid number of generation will be with the grid number phase of selection Together, realized and spliced by paste tool after adjusting the grid of generation and being completely superposed with the grid chosen.
- 4. the grid processing method of basin complicated landform according to claim 1, it is characterised in that：Wherein, (3) Pear-Shaped river course grid processing method comprises the following steps：Step 3-1. is according to terrain generation grid：, it is necessary to draw the place that single line most shrinks in river course, 2 pieces of both sides are just when line regeneration grid is originally drawn The line of friendship is distributed in fan-shaped, then generates grid, adjusts the position of line to adjust grid so that by paracentral grid is long ratio The wide rectangle for being no more than 1.5 and attention and the transition and linkage of upper and lower grid；Thinization of step 3-2. contraction places grid：The center section in Pear-Shaped river course and the grid at river course turning can not be overstocked, need to carry out local thinization processing, click on Operation → thinization grid is by local thinization of grid so that length-width ratio is no more than 1.5 after grid partial enlargement；Step 3-3. is segmented the splicing of grid：On the basis of a coincidence line of two segment mesh, choose into the roughly equal grid of sizing grid at remittance mouth, along this portion Line regeneration grid is drawn in the boundary line of well-graded grid, and the grid number of generation is identical with the grid number of selection, adjustment life Into grid with choose grid be completely superposed after by paste tool realize splice.
- 5. the grid processing method of basin complicated landform according to claim 4, it is characterised in that：Wherein, in step 3-2, the center section in Pear-Shaped river course and the single grid area at river course turning should not be less than The 25% of major trunk roads.
- 6. the grid processing method of basin complicated landform according to claim 1, it is characterised in that：Wherein, band branch in (4) right angle the ears of an ox or cow lake enters grid processing method at remittance and comprised the following steps：Step 4-1. tributaries generate grid respectively with branch：Grid is generated using T-shaped phase connection respectively, i.e., draws two groups of lines along main stem direction and the ears of an ox or cow lake right angle Ru Hui directions, Make its mutually orthogonal, actual landform situation is generalized as a T-shaped, then unified generation grid；Thinization of step 4-2. Local grids：Grid can not be excessively intensive at momentum model, and clicking operation → thinization grid is by local thinization of grid so that grid part Length-width ratio is no more than 1.5 after amplification；Step 4-3. is segmented the splicing of grid：On the basis of a coincidence line of two segment mesh, choose into the similar grid of density degree at remittance mouth, selected along this part Line is drawn in the boundary line of good grid, regenerates grid, the grid number of generation is identical with the grid number of selection, adjusts generation Grid is realized after being completely superposed with the grid chosen by paste tool to be spliced.
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