CN110135056A - Bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river - Google Patents
Bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river Download PDFInfo
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Abstract
It effectively blocks water the fast automatic analysis method of ratio the invention discloses bridge pier in a kind of river, belongs to river dynamics and building hydrodynamic influence of paddling proves technical field.This method mainly comprises the steps that firstly, River Bank-Line terrain pre processing, determines analysis water level and refer to the cross-section of river, calculate the cross-section of river gross area；Secondly, carrying out coordinate conversion by axis of the cross-section of river, bridge pier vertex is projected to the cross-section of river；Then, projected area of the bridge pier on the cross-section of river is calculated, effectively block water than in conjunction with cross-section of river gross area calculating bridge pier and draws the cross-section diagram that blocks water.The invention has the advantages that bridge pier is overcome in river effectively to block water, inefficiency more complicated than calculation method step, accuracy the deficiencies of being influenced by computing staff's skill proficiency, the fast automatic analysis method that bridge pier in a kind of river effectively blocks water ratio is provided, realize river in bridge pier block water ratio automation calculate, improve its efficiency and precision.
Description
Technical field
It effectively blocks water the fast automatic analysis method of ratio the present invention relates to a kind of bridge pier in river, belongs to river dynamics
And building hydrodynamic influence of paddling proves technical field.
Background technique
With the rapid development of transportation, bridge construction project is increasing, these bridge piers in river occupy
The cross-section of river in river generates retardation to water flow, bridge pier occupy cross-section of river effective area and former discharge section area it
Than being that bridge pier effectively blocks water ratio.The choked flow situation effectively to block water than quantitative response bridge pier to water flow, can also qualitatively reflect
Influence of the bridge pier to place streamflow power out preferably and in feasibility study has highly important in bridge construction scheme
Meaning.
Bridge pier effectively block water it is more numerous than influence factor, not only with the close phase such as bridge pier form, span, river width, flow condition
It closes, is also influenced obviously by bridge axle line and the water flow angle of cut, under the influence of these factors, the situation that blocks water of each bridge pier is different, needs
It analyzes one by one.Traditional bridge pier effectively blocks water than calculating, and often uses manual methods: referring to flow section according to main flow direction selection
Afterwards, the area of passage under the water level is calculated in conjunction with river topography and analysis water level；Then bridge pier side is crossed according to bridge pier form one by one
Edge makees flow section vertical line, and binding analysis water level calculates the projected area of bridge pier, finally calculates effective under analysis water level
Block water ratio.Conventional method takes time and effort, and not only computational efficiency is low, but also computational efficiency and accuracy are by computing staff's technical ability
Proficiency is affected, so that calculated result confidence level is extremely unstable.It blocks water analysis demand to meet bridge pier, develops a kind of river
Interior bridge pier effectively blocks water the fast automatic analysis method of ratio, realizes that effectively the block water quick and precisely calculating of ratio of bridge pier is very necessary
's.
Summary of the invention
It is an object of the invention to overcome in river bridge pier effectively to block water, inefficiency, standard more complicated than calculation method step
The deficiencies of exactness is influenced by computing staff's skill proficiency provides bridge pier in a kind of river and effectively blocks water fast automatic point of ratio
Analysis method, realize river in bridge pier block water ratio automation calculate, improve its efficiency and precision.
The purpose of the invention is achieved by the following technical solution:
Bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river, comprising the following steps:
Step S1, the water front to section where bridge pier comprising N number of bridge pier and a certain range (comprising all bridge piers and
The possible analysis section that blocks water) interior underwater topography pre-processed, and generates the landform triangulation network, and setting blocks water score bleed position Z；
Step S2, it determines the section main stream line and blocks water than analysis with reference to flow section, calculate discharge section area SAlways。
Detailed process is as follows:
Step S21, section main stream line can obtain in terms of three, first is that history surveys flow rate of water flow data, second is that model
Test or calculating achievement, third is that directly moving towards rough according to swale pattern by major trough and determining.
Step S22, gap bridge axis and main stream line intersection point make the vertical line of main stream line, by line segment of the vertical line between riverbank
(it is denoted as LAB) to riverbed make section, gained section is to refer to the cross-section of river, LABAs cross-section of river top line section.
Step S23, discharge section area S is calculatedAlways: note LABTwo extreme coordinates are respectively A (a1,b1)、B(a2,b2), it is right
Cross-section of river top line section LABNode encrytion is carried out, using distance DL_jmEncryption amplitude is controlled, D is generally takenL_jm≤ bridge pier is minimum wide
Degree.
Step S24, interpolation is carried out to each node of encryption gained by the landform triangulation network, acquires each node elevation hL_jm(m),
In, the coordinate of each node is denoted as (XL(m),YL(m)), m is node serial number, and node total number is denoted as ML.Binding analysis water level Z is calculated
Obtain each node depth of water HL_jm(m), discharge section area is further calculated out:
HL_jm(m)=Z-hL_jm(m),
Step S3, by bridge pier face profile figure and cross-section of river top line section LABCoordinate conversion is carried out to be whole.
Detailed process is as follows:
Step S31, using terminal A as axis, by bridge pier and cross-section of river top line section LABIt is rotated to be whole, rotates angle:
Step S32, the plane after converting with elementary stream into vertical y-axis, with cross-section of river LABFor horizontal x-axis, the cross-section of river
Top line LABEquation is Y=b1(b1For known constant).
Step S4, after conversion in planar system, the endpoint that blocks water of each bridge pier is projected to the cross-section of river, bridge pier is obtained
The projected segment set in effective region that blocks water.
Detailed process is as follows:
Step S41, after conversion in planar system, to each bridge pier: extracting bridge pier contour line node x-axis coordinate XLK
(n, i), n, i are respectively bridge pier and bridge pier contour line node serial number, indicate i-th of node of n-th of bridge pier, n ∈ 1, N, i are big
In 3 arbitrary integer, being maximized for the sake of easy is 1000；By contour line node x-axis coordinate value XLK(n, i) is sorted by size,
Two nodes of x-axis coordinate value minimum and maximum are searched out, the as endpoint that blocks water of the bridge pier, x-axis coordinate value records respectively
For XnminAnd Xnmax, this two endpoint is projected to the cross-section of river, intersection point is represented by Sn(Xnmin,b1)、En(Xnmax,b1)。
Step S42, each pair of intersection point is pressed into SnIt is worth size sequence, is then blocked water the intersection point S of endpoint according to each bridge piernAnd En
Determine the corresponding Projection Line Segment that blocks water of each bridge pier, as SnAnd EnBetween line segment, N number of bridge pier is total to obtain N number of Projection Line Segment
LS1E1~LSNEN；
Step S43, the endpoint (i.e. N is to intersection point) of N number of Projection Line Segment after sequence is scanned for comparing, after removal projection
Lap obtains bridge pier on the cross-section of river and effectively blocks water top line section (referred to as effectively the block water section) set in region, detailed process
As follows (referring to fig. 2):
Firstly, setting effectively blocks water, section sum NR initial value is N；
Secondly, being differentiated one by one for N to intersection point, with K to intersection point ((SK,EK)K∈1, N) for:
Successively to (J=K+1, N) each pair of intersection point thereafter, judgement: SJWhether between SKAnd EJ-1Between?
If it is not, then [SK,EJ-1] it is that bridge pier effectively blocks water region in the projection of the cross-section of river, as one effectively blocks water section,
K=J is judged into lower a pair of of intersection point；
If so, effectively block water section sum NR-1, data pointer J=J+1, repeat above-mentioned judgement to lower a pair of of intersection point, until J
End when=N.
Step S433, the NR section [X that effectively block water are obtainedS(r),XE(r)], total NR begins, end point coordinate difference to endpoint
For (XS(r),b1)、(XE(r),b1), wherein r ∈ 1, NR.
Step S5, projected area S of the bridge pier on the cross-section of river is calculatedResistance。
Specific implementation procedure is as follows:
Step S51, section start-stop extreme coordinates contravariant that NR effectively blocks water shifts under former coordinate system；
Each section coordinate inverse transformation that effectively blocks water:
Starting endpoint transformation for mula are as follows:
Termination end points transformation for mula are as follows:
S52, node encrytion is carried out to Projection Line Segment each under former coordinate system, every section of node total number is denoted as NVr, using distance
DR_jm(r) encryption amplitude is controlled, D is takenR_jm(r)≤line segment corresponds to bridge pier width/2.0；
S53, for NR Projection Line Segment under former coordinate, interpolation is carried out to each node of encryption gained by the landform triangulation network,
Each node coordinate is denoted as (XR(r,f),YR(r, f), r=1 ..., NR, f=1 ..., NVr), acquire each node elevation hR_jm(r,
F), binding analysis water level Z calculates to obtain each node depth of water HR_jm(r, f), and then the region area that effectively blocks water, formula is calculated
It is as follows:
HR_jm(r, f)=Z-hR_jm(r,f)
Step S6, it calculates the bridge pier under analysis Z water level and effectively blocks water and compare, draw the sectional view that blocks water.
Detailed process is as follows:
Step S61, it is effectively blocked water according to bridge pier than calculation formula: REffectively=SResistance/SAlways× 100%, it calculates under analysis water level Z
Effectively block water ratio.
Step S62, according to cross-section of river top line section LABNode coordinate (XL(m),YL(m), m ∈ 1, ML) calculate each node extremely
The distance DIS (m) of starting endpoint A:
Starting point distance DIS (1)=0；
2~NL nodal distance:
Step S63, according to cross-section of river top line section LABDistance-elevation ((DIS (m), HL_jm(m)), m ∈ 1, ML) information
Draw cross-section of river sectional view；
Step S64, NR each the endpoint ((X of section that effectively block water are determinedS(r),XE(r)), r ∈ 1, NR) distance-elevation letter
Breath, each end-point distances are to convert the x coordinate value of each endpoint under coordinate system, each endpoint elevation h of the section that blocks waterResistanceAs Pier Design top
Elevation can use any constant for being higher than analysis water level.
Step S65, the profile data series that blocks water is drawn according to above-mentioned distance-elevation information, is added to cross-section of river section
Figure generates the section sectional view that blocks water.
The present invention has the following advantages and effects with respect to the prior art:
The present invention overcomes in river effectively block water, inefficiency more complicated than calculation method step, accuracy of bridge pier to be calculated
Personnel's skill proficiency influences the deficiencies of obvious, provides the fast automatic analysis method that bridge pier in a kind of river effectively blocks water ratio,
Realize river in bridge pier block water ratio automation calculate, improve its efficiency and precision.
Detailed description of the invention
Fig. 1 is that bridge pier effectively blocks water figure the step of than fast automatic analysis method in a kind of river disclosed by the invention；
Fig. 2 is to carry out the flow chart that plyability analysis obtains the section that effectively blocks water to each pair of abutment projection line segment in the present invention；
Fig. 3 is present example bridge pier floor plan；
Fig. 4 is practical example waters underwater topography and scatter plot；
Fig. 5 is the underwater topography triangulation network that engineering waters generates in example；
Fig. 6 is flow section L in exampleABThe location drawing；
Fig. 7 is using cross-section of river terminal A as vertex in example, with LABFor the coordinate transition diagram of axis；
Fig. 8 is No. 6 pier contour line nodes and projection intersection point corresponding relationship in example；
Fig. 9 is all abutment projection line segments and detail view in example；
Figure 10 is that flow section figure before engineering is drawn in example；
Figure 11 is to draw bridge pier in example to block water cross-section diagram.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
Embodiment:
Effectively block water than analyzing for the southern tributary waterway Bridge Design scheme of any of several broadleaf plants door, in the master of nearly west bank in this example
Slot two sides are furnished with 2 groups of main piers, and in the Near East, the shoal area of bank is equipped with 3 groups of abutment piers, and all bridge piers are all made of separate type framing cloth up and down
It sets, main pier list pier plane is rectangle, and 9.5 × 14.5m of size, abutment pier list pier plane is round rectangle, and 6 × 10m of size, bridge pier sets
Meter crest level is 13.5m, and bridge pier horizontal layout is as shown in figure 3, set analysis water level as 0m.
As shown in Figure 1, in a kind of river of the present invention bridge pier effectively block water ratio fast automatic analysis method specifically include with
Lower step:
Step S1, (all bridge piers and possibility are included to the water front of any of several broadleaf plants door south branch and a certain range where proposed bridge pier
The analysis section that blocks water, taken range is that the interior underwater topography of bridge upstream 238m to downstream 302m) is pre-processed in this example,
Engineering waters underwater topography and scatterplot are obtained as shown in figure 4, and to generate the landform triangulation network as shown in Figure 5；
Step S2, it determines the main stream line of engineering place section and blocks water than analysis with reference to flow section, calculate the cross-section of river
Area SAlways。
Step S21, the section main stream line, engineering in this example are determined according to history flow velocity data (Primary Reference major trough waters)
Section main stream line direction is about 14.68 ° of positive south by east.
Step S22, the intersection point of gap bridge axis and main stream line makees the vertical line of main stream line, the vertical line and riverbank two sides embankment intersection point
It is denoted as A (a respectively1,b1)、B(a2,b2), cross line segment LABMake section to riverbed, gained section is to refer to the cross-section of river, plan view
In with its top line LABIt indicates, as shown in Figure 6.Line segment LABEach extreme coordinates are known quantity, in this example, a1=38456410.8002；
b1=2512955.3689；a2=38457253.0768；b2=2513175.9547.
Step S23, discharge section area S is calculatedAlways: to cross-section of river top line section LABNode encrytion is carried out, using distance
DL_jmEncryption amplitude is controlled, D is generally takenL_jm≤ bridge pier minimum widith, bridge pier minimum widith is 6m in this example, by line segment LABUniformly
Being encrypted as 201 (NL) a nodes, (coordinate is denoted as (XL(i),YL(i)), i=1,201), encrypt amplitude DL_jmAbout 4.3534m.
Step S24, interpolation is carried out to each node of encryption gained by the landform triangulation network, wherein the coordinate of each node is denoted as (XL
(m),YL(m)), m is node serial number, and node total number is denoted as ML, acquires each node elevation hL_jm(m), depth of water H under 0m can be obtainedL_jm
(m), discharge section area is further calculated out:
HL_jm(m)=0-hL_jm(m),
Calculate to obtain engineered locations discharge section area S in this exampleAlwaysFor 4171.71m2。
Step S3, by bridge pier face profile figure and cross-section of river top line section LABCoordinate conversion is carried out to be whole, such as Fig. 7 institute
Show.
Step S31, using terminal A as axis, by bridge pier and cross-section of river top line section LABIt is rotated to be whole, rotates angle:The angle is equal to the angle of main stream line Yu positive south orientation, is 14.68 °.
Step S32, the plane after converting, into vertical y-axis, is L with the cross-section of river with elementary streamABHorizontal x-axis, the cross-section of river
Top line LABEquation is Y=b1=2512955.3689.
Step S4, after conversion in planar system, the endpoint that blocks water of each bridge pier is projected to the cross-section of river, bridge pier is obtained
The projected segment set in effective region that blocks water.
Step S41, after conversion in planar system, to each bridge pier: extracting bridge pier contour line nodes X axial coordinate (XLK
(n, i), n, i respectively indicate i-th of node of n-th of bridge pier, share 10 bridge piers in this example in river, and n value is up to 10, i
For the arbitrary integer greater than 3, i maximum value is 100 in this example.By contour line node x-axis coordinate value XLK(n, i) is sorted by size,
Two nodes of x-axis coordinate value minimum and maximum are searched out, the as endpoint that blocks water of the bridge pier, x-axis coordinate value records respectively
For XnminAnd Xnmax, this two endpoint is projected to the cross-section of river, intersection point is represented by Sn(Xnmin,b1)、En(Xnmax,b1)。
By taking more complicated No. 6 piers of bridge pier profile as an example, each node coordinate XLK(n, i) is shown in Table 1.
1 No. 6 pier contour line nodes X coordinates of table
Ranked analysis, the smallest X value is the 35th nodes X in No. 6 each nodes of pier contour lineLK(6,35), X value are maximum
For the 13rd nodes XLK(6,13), then have X6min=XLK(6,35)=38457092.24, X6max=XLK(6,13)=
38457098.53 then No. 6 pier projection intersection points are S6(38457092.24,2512955.3689)、E6(38457098.53,
2512955.3689), as shown in Figure 8.
Step S42, this Bridge alternatives shares 10 bridge piers and is located in river (N=10), then has 10 couples of intersection point ((Sn,En),n
=1,10) each pair of intersection point, is pressed into SnIt is worth size sequence, correspondingly, obtains 10 Projection Line Segment LS1E1、LS2E2、LS3E3、LS4E4、
LS5E5、LS6E6、LS7E7、LS8E8、LS9E9、LS10E10(subscript S1, E1 is line segment endpoint, i.e. intersection point is other same), but these line segments can
Can exist overlapped, not all be formed and effectively blocked water section, such as LS1E1And LS2E2Between there are lap line segment (S2,E1),
As shown in Figure 9.
Step S43, the start-stop endpoint (namely all intersection points) of 10 Projection Line Segments is scanned for comparing, removal is thrown
Movie queen's lap obtains top line section (referred to as effectively the block water section) set in the practical region that blocks water of bridge pier on the cross-section of river, specifically
Process is as follows, referring to fig. 2:
Firstly, setting effectively blocks water, section sum NR initial value is NR=10；
Secondly, being differentiated one by one for 10 pairs of intersection points:
For (S1,E1) judgement, S2Between S1And E1Between it is no? it is, then LS1E2For the section that effectively blocks water, the section that effectively blocks water sum
NR=9, data pointer J=3；
For (S3,E3) judgement, S4Between S3And E3Between it is no? it is, then LS3E4For the section that effectively blocks water, the section that effectively blocks water sum
NR=8, data pointer J=5；
For (S5,E5) judgement, S6Between S5And E5Between it is no? it is, then LS5E6For the section that effectively blocks water, the section that effectively blocks water sum
NR=7, data pointer J=7；
For (S7,E7) judgement, S8Between S7And E7Between it is no? it is, then LS7E8For the section that effectively blocks water, the section that effectively blocks water sum
NR=6, data pointer J=9；
For (S9,E9) judgement, S10Between S9And E9Between it is no? it is, then LS9E10For the section that effectively blocks water, the section that effectively blocks water is total
Number NR=5, data pointer J=11, J > N, terminate determining program.
Finally, obtaining 5 sections that effectively block water, LS1E2、LS3E4、LS5E6、LS7E8、LS9E10, NR=5.
Step S5, projected area S of the bridge pier on the cross-section of river is calculatedResistance；
Step S51, section start-stop extreme coordinates contravariant that 5 effectively blocks water shifts under former coordinate system；
Each section coordinate inverse transformation that effectively blocks water:
Starting endpoint transformation for mula are as follows:
Termination end points transformation for mula are as follows:
In this example, NR=5, a1=38456410.8002；b1=2512955.3689；a2=38457253.0768；b2=
2513175.9547 θ=14.68 °.
Step S52, to a Projection Line Segment of r (=5) under former coordinate system progress node encrytion, (every section of node total number is denoted as NVr,
R=1,6)), using distance DR_jm(r) encryption amplitude, D are controlledR_jm(r)≤line segment corresponds to bridge pier width/2.0, every throwing in this example
Shadow section is divided into 5 sections, unified NVr=6, DR_jm(r) value is respectively 3.362m, 3.362m, 1.51m, 1.512m, 1.512m.
Step S53, for 5 Projection Line Segments under former coordinate, by the landform triangulation network, to each node of encryption gained, (coordinate is remembered
For (XR(r,f),YR(r,f)),r∈1,5；F ∈ 1,6) interpolation is carried out, acquiring each node elevation is the water under 0m analysis water level
Deep HR_jm(r, f) further calculates the region area that effectively blocked water:
HR_jm(r, f)=Z-hR_jm(r,f)
SResistance=111.37+60.62+14.71+17.42+10.4=214.52 (m2)
Step S6, it calculates bridge pier and effectively blocks water and compare, draw the sectional view that blocks water.
Step S61, it is effectively blocked water according to bridge pier than calculation formula: REffectively=SResistance/SAlways× 100%, calculate under 0m water level
Bridge pier effectively blocks water ratio are as follows:
REffectively=214.52/4171.71 × 100%=5.14%.
Step S62, according to cross-section of river top line section LABNode coordinate ((XL(m),YL(m)), m ∈ 1,201) calculate each section
It puts to the distance DIS (m) (m ∈ 1,201) of starting endpoint A (west side embankment):
Starting point distance DIS (1)=0；
2nd~201 (NL) nodal distance:
Step S63, according to cross-section of river top line section LABDistance-elevation ((DIS (m), HL_jm(m)), m ∈ 1, NL) information
Cross-section of river sectional view is drawn, as shown in Figure 10；
Step S64,5 section L that effectively block water are determinedS1E2、LS3E4、LS5E6、LS7E8、LS9E10Distance-elevation information, it is each to hold
Point distance is to convert the X value of coordinate system lower extreme point, such as line segment LS5E6Endpoint S5、E6Distance is hanging down using the cross-section of river as X-axis
Sufficient S5、E6X value, all section elevation information (h that block waterResistanceAs Pier Design crest level is 13.5m in this example, can simplify and take one
A constant for being higher than analysis water level, this example take 5m；
Step S65, the profile data series that blocks water is drawn according to above-mentioned distance-elevation information, is added to cross-section of river section
Figure generates the section sectional view that blocks water, as shown in Figure 8.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river, which is characterized in that the fast automatic analysis
Method the following steps are included:
S1, underwater topography in the water front of section where the bridge comprising N number of bridge pier and a certain range is pre-processed, generates ground
The shape triangulation network sets the score bleed position Z that blocks water, wherein described a certain range refers to comprising all bridge piers and the possible analysis that blocks water
The region of section；
It S2, the main stream line for determining section where bridge pier and blocks water than analysis with reference to flow section, calculates discharge section area SAlways；
S3, by bridge pier face profile figure and cross-section of river top line section LABCoordinate conversion is carried out as a whole；
S4, after conversion in planar system, the endpoint that blocks water of each bridge pier is projected to the cross-section of river, bridge pier is obtained and effectively blocks water
The projected segment set in region；
S5, projected area S of the bridge pier on the cross-section of river is calculatedResistance；
S6, it calculates the bridge pier analyzed under Z water level and effectively blocks water and compare REffectively, draw the sectional view that blocks water, wherein the bridge pier effectively hinders
Water is as follows than calculation formula: REffectively=SResistance/SAlways× 100%.
2. bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river according to claim 1, feature
It is, the main stream line of bridge pier place section is determined in the step S2 and blocks water than analysis with reference to flow section, it is disconnected calculated water
Face area SAlwaysProcess it is as follows:
S21, section main stream line is determined, wherein the method for determining section main stream line include the following: (1) water flow is surveyed by history
Flow velocity data, (2) by model test or calculating achievement, then (3) are moved towards to determine according to swale pattern by major trough；
S22, the vertical line that gap bridge axis and main stream line intersection point are made to main stream line, are made from line segment of the vertical line between riverbank to riverbed
Section, gained section are to refer to the cross-section of river, wherein line segment of the vertical line between riverbank is denoted as LAB, the as cross-section of river
Top line section；
S23, discharge section area S is calculatedAlways: note LABTwo extreme coordinates are respectively A (a1,b1)、B(a2,b2), to the cross-section of river
Top line section LABNode encrytion is carried out, using distance DL_jmEncryption amplitude is controlled, D is takenL_jm≤ bridge pier minimum widith；
S24, interpolation is carried out to each node of encryption gained by the landform triangulation network, acquires each node elevation hL_jm(m), wherein each node
Coordinate be denoted as (XL(m),YL(m)), m is node serial number, and node total number is denoted as ML；Binding analysis water level Z calculates to obtain each node
Depth of water HL_jm(m), discharge section area is calculated:
HL_jm(m)=Z-hL_jm(m),
3. bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river according to claim 2, feature
It is, by bridge pier face profile figure and cross-section of river top line section L in the step S3ABThe process of coordinate conversion is carried out as a whole
It is as follows:
S31, using terminal A as axis, by bridge pier and cross-section of river top line section LABIt is rotated to be whole, rotates angle:
S32, convert after plane coordinate system with elementary stream into vertical y-axis, with cross-section of river LABFor horizontal x-axis, cross-section of river top
Line LABEquation is expressed as Y=b1, b1For known constant.
4. bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river according to claim 1, feature
It is, projects the endpoint that blocks water of each bridge pier to the cross-section of river in the step S4, obtains bridge pier and effectively block water region projection
The process of Duan Jihe is as follows:
S41, after conversion in planar system, bridge pier contour line node x-axis coordinate X is extracted to each bridge pierLK(n, i), n, i points
Not Wei bridge pier and bridge pier contour line node serial number, indicate n-th of bridge pier i-th of node, n ∈ 1, N, i be it is any whole greater than 3
Number, being maximized for the sake of easy is 1000；By contour line node x-axis coordinate value XLK(n, i) is sorted by size, and searches out x-axis seat
Two nodes of scale value minimum and maximum, the as endpoint that blocks water of the bridge pier, x-axis coordinate value are recorded as X respectivelynminAnd Xnmax,
This two endpoint is projected to the cross-section of river, intersection point is represented by Sn(Xnmin,b1)、En(Xnmax,b1)；
S42, each pair of intersection point is pressed into SnIt is worth size sequence, is then blocked water the intersection point S of endpoint according to each bridge piernAnd EnIt determines each
The corresponding Projection Line Segment that blocks water of bridge pier, as SnAnd EnBetween line segment, N number of bridge pier is total to obtain N number of Projection Line Segment LS1E1~
LSNEN；
S43, to the endpoint of N number of Projection Line Segment after sequence, i.e. N scans for comparing to intersection point, removal projection after lap,
Bridge pier on the cross-section of river is obtained effectively to block water the top line segment aggregate in region.
5. bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river according to claim 1, feature
It is, the process of the step S43 is as follows:
S431, setting block water section sum NR initial value effectively as N；
S432, N differentiates intersection point one by one, with K to intersection point (SK,EK), for K ∈ 1, N: successively to (J=K thereafter
+ 1, N) each pair of intersection point judgement, judge SJWhether between SKAnd EJ-1Between,
If it is not, then [SK,EJ-1] it is that bridge pier effectively blocks water region in the projection of the cross-section of river, as one effectively blocks water section, enters
Lower a pair of intersection point judges K=J；
If so, effectively block water section sum NR-1, data pointer J=J+1, repeat above-mentioned judgement to lower a pair of of intersection point, until J=N
When end；
S433, the NR section [X that effectively block water are obtainedS(r),XE(r)], total NR begins, end point coordinate is respectively (X to endpointS(r),
b1)、(XE(r),b1), wherein r=1 ..., NR.
6. bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river according to claim 1, feature
It is, projected area S of the bridge pier on the cross-section of river is calculated in the step S5ResistanceProcess it is as follows:
S51, a section start-stop extreme coordinates contravariant that NR effectively block water shift under former coordinate system；
Each section coordinate inverse transformation that effectively blocks water:
Starting endpoint transformation for mula are as follows:
Termination end points transformation for mula are as follows:
S52, node encrytion is carried out to Projection Line Segment each under former coordinate system, every section of node total number is denoted as NVr, using distance DR_jm(r)
Encryption amplitude is controlled, D is takenR_jm(r)≤line segment corresponds to bridge pier width/2.0；
S53, NR Projection Line Segment under former coordinate is respectively saved by the landform triangulation network to each node progress interpolation of encryption gained
Point coordinate is denoted as (XR(r,f),YR(r, f), r=1 ..., NR, f=1 ..., NVr), acquire each node elevation hR_jm(r, f), knot
Analysis water level Z is closed, each node depth of water H is calculated to obtainR_jm(r, f), and then the region area that effectively blocks water is calculated, formula is as follows:
HR_jm(r, f)=Z-hR_jm(r,f)
7. bridge pier effectively blocks water the fast automatic analysis method of ratio in a kind of river according to claim 1, feature
Be, in the step S6 calculate bridge pier effectively block water ratio, draw block water sectional view process it is as follows:
S61, it is effectively blocked water according to bridge pier than calculation formula: REffectively=SResistance/SAlways× 100%, calculate effective resistance under analysis water level Z
Water ratio；
S62, according to cross-section of river top line section LABNode coordinate (XL(m),YL(m), m ∈ 1, ML) each node is calculated to starting endpoint A
Distance DIS (m):
Starting point distance DIS (1)=0；
2~NL nodal distance:
S63, according to cross-section of river top line section LABDistance-elevation (DIS (m), HL_jm(m) information draws cross-section of river sectional view；
S64, NR each the endpoint ((X of section that effectively block water are determinedS(r),XE(r)), r ∈ 1, NR) distance-elevation information, each endpoint
Distance is the x coordinate value of each endpoint under conversion coordinate system, each endpoint elevation h of the section that blocks waterResistanceAs Pier Design crest level can use
Any constant for being higher than analysis water level；
S65, block water profile data series according to above-mentioned distance-elevation information drafting, is added to cross-section of river sectional view, generates resistance
Water section sectional view.
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