CN108648127A - A kind of urban air pollution hot spot region locking means - Google Patents
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Abstract
The present invention proposes a kind of urban air pollution hot spot region locking means, belongs to air pollution monitoring field.The method of the present invention includes：Step 1 is established grid to monitoring region and is numbered；Step 2 is diffused fitting, while each grid pollutant concentration value in zoning based on Gauss multiple sources air pollutants diffusion model to the air pollutants in region；Step 3 chooses the highest grid of air pollutant concentration as starting point, locks air pollution hot spot region at one；Step 4 has chosen the highest grid of grid set Air Contamination object concentration value around dot grid；Step 5, grid step 4 chosen plays dot grid as new；Step 6 has judged whether dot grid is boundary mesh, if terminating this method, if not continuing to execute step 4.The present invention can accurately lock air pollution hot spot region, can more efficiently grasp the dynamic process of the pollutant diffusion in region.
Description
Technical field
The invention belongs to air pollution monitoring fields, are a kind of urban air pollution hot spot region locking means.
Background technology
With the raising of the continuous development and people's quality of life of economic level, air pollution problems inherent also gradually protrudes.It is empty
Gas pollution problem seriously endangers health of people, influences society and continues well to develop.To solve this problem, many researchs around
Air quality monitoring, Air Pollution Forecast etc. are unfolded.
Traditional heavy air pollution process analysis is all a kind of not standardized mode by professional's experience, different
Service unit or R＆D institution are all not quite similar for the method that heavy air pollution process is analyzed, and existing technological means stresses to supervise certain
It surveys in region and time or the forecast of intensity of serious pollution occurs.
Due to existing research, lack the data for being obtained using air pollution monitoring come the pollution heat in ' locked ' zone
The technical research in point region, therefore preferably to administer air pollution problems inherent, a kind of urban air pollution hot spot region is needed to lock
Fixed method.
Invention content
The object of the present invention is to provide a kind of urban air pollution hot spot region locking means, dirty to lock air in city
The spatial character of serious pollution occurs in more stressing, in Large-scale areas for the higher region of dye degree.
A kind of urban air pollution hot spot region locking means of the present invention, in the region and air pollution that monitoring is determined
After object, following steps are then executed：
Step 1, gridding processing is carried out to monitoring region, and is numbered for each grid；
In the step 1, monitoring region is divided into the grid of homalographic, then using lower left corner starting point as origin area
Domain, with to the right for positive direction of the x-axis, upwards for positive direction of the y-axis, the volume of each grid is determined with the coordinate value of x-axis and y-axis
Number.
Step 2, the air pollutants in region are diffused based on Gauss multiple sources air pollutants diffusion model quasi-
It closes, the pollutant concentration value of each grid in zoning；
It will if (x, y, z) is the central point of grid pollution to be studied to the grid that number in monitoring region is (a, b)
The contamination value superposition of each point source of pollution at this point, the pollutant concentration value C as the grida,b。
Pollutant concentration value C is calculated according to Gauss multiple sources air pollutants diffusion model shown belowa,b：
Wherein, N is pollution sources number；The soiling value of (x, y, z) is diffused in for k-th of point source of pollution；H
For the sum of pollution source height and degree of leaping high on smoke plume emission；For specific grid, center can be determined according to practical study situation
Point (x, y, z), studies contamination value of each point source of pollution at this, and z is arranged according to actual conditions；
The soiling value for obtaining all grids is calculated according to the Gauss multiple sources air pollutants diffusion model；
Step 3 chooses in monitoring region in non-borderline region the highest grid of air pollutant concentration as starting point；
And dot grid will be played as air pollution hot spot region at one；
Step 4 gathers the air pollutant concentration value for playing the grid around dot grid as one, compares each in set
A grid air pollutant concentration value chooses the highest grid of set Air Contamination object concentration；
Step 5, using the grid selected by step 4 as air pollution hot spot region at one, and it is starting point to update the grid
Grid；
Step 6, judge newly to determine rise dot grid whether be zone boundary grid, it is dirty if it is all air is exported
Hot spot region is contaminated, this method is terminated；If it is not, continuing to go to step 4 execution.Compared with prior art, the present invention with following
Clear superiority：
(1) present invention fits the air pollution situation in region everywhere, more efficiently grasps the pollutant in region
The dynamic process of diffusion；
(2) present invention relies on the support of air pollution diffusion theory, improves the standard locked to air pollution hot spot region
True property；
(3) air pollution hot spot region in the present invention effectively ' locked ' zone.
Description of the drawings
Fig. 1 is the overall flow schematic diagram of the urban air pollution hot spot region locking means of the present invention；
Fig. 2 is the design sketch that Regional Networked processing is monitored in the embodiment of the present invention；
Fig. 3 is the design sketch of grid where the start position of region in the embodiment of the present invention；
Fig. 4 is the design sketch of the concentration value around grid where comparing start position in the embodiment of the present invention；
Fig. 5 is the design sketch that start position is updated in the embodiment of the present invention；
Fig. 6 is the design sketch that air pollution hot spot region is updated in the embodiment of the present invention；
Fig. 7 is a design sketch using the method for the present invention positioning air pollution hot spot region；
Fig. 8 is the design sketch of practical application locking air pollution of the present invention hot spot region.
Specific implementation mode
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and examples to this hair
It is bright to be described in further detail.
It is directed to air pollution monitoring field, a kind of side of urban air pollution hot spot region locking proposed by the present invention
Method, overall flow as shown in Figure 1, illustrate each realization process below.
First have to the region that determination to be studied and the air pollutants to be studied.According to the arrangement area of urban air monitoring point
Domain, determines its regional extent that can be real-time monitored, and according to Gauss diffusion model can reasonable scientifically fit range, determine
The region to be studied.The common air pollutants in city are nitrogen dioxide (NO2), sulfur dioxide (SO2), it is carbon monoxide (CO), smelly
Oxygen (O3)、PM2.5、PM10Deng.
Step 1, networking processing is carried out to monitoring region, and is numbered for each grid.
The grid of several homalographics is divided into according to the features such as size, regional function, natural conditions in monitoring region,
Further to analyze and research.As shown in Fig. 2, using lower left corner starting point as area of origin, with to the right for positive direction of the x-axis, with to
Upper is positive direction of the y-axis, and the coordinate number of each grid is determined with the coordinate value of x-axis and y-axis.As shown in Fig. 2, by area to be monitored
After the grid division of domain, if (a, b) indicates that the coordinate of grid, wherein a, b are integer, and 1≤a≤m, 1≤b≤n, it will wait in this way
Monitoring region can indicate that m × n is grid sum, and m, n are positive integer with a matrix.If using Ca,bExpression grid (a,
B) pollutant concentration value, as shown in Fig. 2, needing to calculate the pollutant concentration value of each grid according to step 2 below.
Step 2, the air pollutants in region are diffused based on Gauss multiple sources air pollutants diffusion model quasi-
It closes, the pollutant concentration value of each grid in zoning.
It is three-dimensional empty to calculate the pollutant after reaching stable state for air pollution source for Gauss plume pattern, abbreviation gaussian model
Between the common model that is distributed.
Air pollution Gauss Diffusion Mode is the dispersal pattern under assuming using the normal distribution that the statistical theory of turbulence obtains.
It is projected as coordinate origin on ground with pollutant point source, it is any with wind direction under point source using the direction of origin direction leeward as x-axis
The pollutant concentration ρ of point (x, y, z)C(x, y, z, H) is to solve object, then Gauss contamination equation is:
Wherein：ρCFor the pollutant concentration at any point (x, y, z), unit is mg/m3；
H is the sum of pollution source height and degree of leaping high on smoke plume emission；
α is the ground reflection coefficent of particle；
qmFor discharge of pollutant sources intensity, i.e. unit interval pollutant discharge amount；
V is mean wind speed, and unit is m/s；
σyAnd σzIt is related with atmospheric stability and horizontal distance x in the diffusion coefficient in the directions y and the directions z, and with x's
Increase and increases；
vtFor the gravity settling velocity of particle, unit is m/s, and calculation formula is：
In formula：dpFor particle diameter；ρpFor grain density；μ is air viscosity；G is acceleration of gravity.
As H=0, pollution sources are referred to as ground point source.As H ≠ 0, pollution sources are referred to as overhead point source.Normal conditions
Under, the value of H includes the height of chimney plus degree of leaping high in smoke evacuation.
In addition, in formula when the grain size of particle is less than 15 μm, then the ground return and gravitational settling speed of particle are not considered
It spends, at this time α=0 and vt=0.When the grain size of particle is more than 15 μm, it is necessary to consider the settlement action of gravity.
When there is multiple pollution sources in region, the pollutant concentration value based on each grid in gaussian model zoning.
Gaussian model basic principle is spread in multiple sources air pollution：
Mainly consider pollution sources and zoning when being diffused in calculating based on gaussian model air pollution.In the effect of wind field
Under, Polluted area usually considers a certain range of solid space of pollution sources leeward.In actual calculating, area will be studied
The multiple air pollution sources in domain are diffused fitting.It is to be directed to contamination of the pollution sources to some grid element center point that pollution, which calculates,
Determine the pollutant concentration value of the point.The result merged according to the pollutant concentration value in each grid being calculated is just
It is the concentration value of the pollutant in final grid.
For some grid (a, b), if (x, y, z) is the central point of its pollution to be studied, then according to height shown below
This multiple sources air pollutants diffusion model calculates：
Wherein, N is pollution sources number；Ca,bFor the superposition value for the pollutant concentration value that multiple point sources in the grid generate, by
The independent diffusion of N number of pollution sources obtainsSuperposition obtains.It is diffused in net for k-th of point source of pollution
The soiling value at lattice center (x, y, z) is calculated according to Gauss contamination equation above.
For specific grid, it can determine central point (x, y, z) according to practical study situation, study each point source of pollution and exist
Contamination value at this, z are arranged according to actual conditions.It is counted according to Gauss multiple sources air pollutants diffusion model above
Calculate the soiling value for obtaining all m × n grids.
Step 3, grid is chosen in monitoring region in non-borderline region at air pollutant concentration highest one as starting point
Position, in fig. 2 Ca,b(1<a<M, 1<b<N) grid where belongs to non-borderline region.
Step 4, grid is as air pollution hot spot region at one where choosing start position.For example, area as shown in Figure 3
The grid that (2,2) determine in domain is start position, then the grid is air pollution hot spot region at one.
Step 5, gather the air pollutant concentration value of the grid around the starting point as one, compare each in set
Grid air pollutant concentration value chooses the highest grid of set Air Contamination object concentration.
For example, start position C as shown in Figure 42,2The grid at place is air pollution hot spot region, in the concentration value of surrounding
Collection is combined into [C1,1,C2,1,C3,1,C1,2,C3,2,C1,3,C2,3,C3,3]；The set Air Contamination object concentration peak is chosen, i.e.,
max[C1,1,C2,1,C3,1,C1,2,C3,2,C1,3,C2,3,C3,3], determine the grid where the air pollutant concentration value.
Step 6, the set highest grid of Air Contamination object concentration determined in above-mentioned steps is dirty as air at one
Contaminate hot spot region, update air pollution hot spot region.
For example, as shown in figure 5, surrounding concentration value set [C1,1,C2,1,C3,1,C1,2,C3,2,C1,3,C2,3,C3,3] in
Air pollutant concentration peak is C3,3, then air pollution concentration value C3,3The grid at place is air pollution hot zone at one
Domain is updated air pollution hot spot region.
Step 7, start position is updated, the highest grid of the air pollutant concentration that step 6 is obtained is as a point
It sets.
For example, as shown in figure 5, by C3,3The grid at place is as start position.
Step 8, judge newly determine rise dot grid whether be zone boundary grid, if the grid is not zone boundary
Grid, then go to step 5 execution, it is new to collect using the concentration value of the grid around the starting point grid position set new as one
Do not include the concentration value for the grid being compared in conjunction, chooses the highest grid of concentration in the set, carry out air pollution
Hot spot region updates.
For example, as shown in fig. 6, by the starting point grid position, that is, C3,3The grid at place, the concentration value conduct of the grid of surrounding
One new set [C4,2, C4,3, C2,4, C3,4, C4,4], do not include the concentration value for the grid being compared, choosing in the set
The highest grid of concentration in the set is taken, air pollution hot spot region update is carried out.
If updated dot grid of step 8 is the grid of zone boundary, final air pollution hot spot region is exported.Example
Such as, as shown in fig. 7, it is zone boundary grid C to play dot grid5,5When the grid at place, stop the update of air pollution hot spot region,
Delivery air pollutes hot spot region.1. 2. 3. 4. 5. the net region at place is the final air pollution exported to figure label
Hot spot region.
The calculating effect that the method for the present invention is presented in practical applications is as shown in Figure 8.It is high using multiple sources air pollution
This dispersal pattern realize in region there are many places pollution sources in the case of, the pollutant concentration match value of region everywhere, and energy
It is enough to be compared by the concentration value size to each point, " one " pollution hot spot region " band " is locked out, so that it is determined that pollution heat
Point region.Air pollution hot spot region can be accurately locked by the method for the invention, can more efficiently be grasped in region
Pollutant diffusion dynamic process.
The above is only the preferred embodiment of the invention, is not intended to restrict the invention, it is noted that for this skill
The technical staff in art field can also make several improvement and deformations without departing from the technical principles of the invention, these
Improvement and deformation also should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of urban air pollution hot spot region locking means, after monitoring region and air pollutants are determined, feature
It is, then executes following steps：
Step 1, gridding processing is carried out to monitoring region, and is numbered for each grid；
Step 2, fitting is diffused to the air pollutants in region based on Gauss multiple sources air pollutants diffusion model, counted
Calculate the pollutant concentration value of each grid in region；
It will be each if (x, y, z) is the central point of grid pollution to be studied to the grid that number in monitoring region is (a, b)
The contamination value superposition of point source of pollution at this point, the pollutant concentration value C as the grida,b；
Pollutant concentration value C is calculated according to Gauss multiple sources air pollutants diffusion model shown belowa,b：
Wherein, N is pollution sources number；The soiling value of (x, y, z) is diffused in for k-th of point source of pollution；H is dirt
Contaminate the sum of source height and degree of leaping high on smoke plume emission；
The soiling value for obtaining all grids is calculated according to the Gauss multiple sources air pollutants diffusion model；
Step 3, choose in monitoring region that the highest grid of air pollutant concentration is used as starting point, and general in non-borderline region
Dot grid is played as air pollution hot spot region at one；
Step 4, the air pollutant concentration value for playing the grid around dot grid is gathered as one, compares each net in set
Lattice air pollutant concentration value chooses the highest grid of set Air Contamination object concentration；
Step 5, using the grid selected by step 4 as air pollution hot spot region at one, and it has been dot grid to update the grid；
Step 6, judge newly to determine rise dot grid whether be zone boundary grid, if it is exporting all air pollution heat
Point region, terminates this method；If it is not, continuing to go to step 4 execution.
2. urban air pollution hot spot region according to claim 1 locking means, which is characterized in that the step 1
In, region will be monitored and be divided into the grid of homalographic, then using lower left corner starting point as area of origin, be to the right positive direction of the x-axis,
Upwards for positive direction of the y-axis, the number of each grid is determined with the coordinate value of x-axis and y-axis.
3. urban air pollution hot spot region according to claim 1 locking means, which is characterized in that the step 2
In, the Gauss contamination of a point source of pollution is：If point source of pollution is directed toward leeward in the coordinate origin that is projected as on ground, origin
Direction be x-axis, then under point source wind direction any point (x, y, z) pollutant concentration ρC(x, y, z, H) is：
Wherein：α is the ground reflection coefficent of particle；qmFor discharge of pollutant sources intensity；V is mean wind speed；σyAnd σzFor in the directions y
With the diffusion coefficient in the directions z；vtFor the gravity settling velocity of particle, calculation formula is：
In formula：dpFor particle diameter；ρpFor grain density；μ is air viscosity；G is acceleration of gravity.
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| CN109543592A (en) * | 2018-11-19 | 2019-03-29 | 北京英视睿达科技有限公司 | The method and device of atmosphere pollution hot spot grid is determined based on remote sensing atural object |
| CN109543990A (en) * | 2018-11-19 | 2019-03-29 | 北京英视睿达科技有限公司 | The method and device of atmosphere pollution hot spot grid is determined based on pollution sources |
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