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4.2. Results of numerical modelling of distribution of air-gas streams from the gas station and the analysis of influence of emissions on an adjoining residential construction

For the purpose of acknowledgement of theoretical preconditions, establishments steyopeni reliability of results theoretical and experimental issleyodovany in the aerodynamic chamber, and also for influence studying gradoyostroitelnyh and architecturally-planirovochnyh factors on movement vozdushyonogo a stream flowing round the gas station both adjoining territory and influencing distribution of harmful substances in a ground layer of atmosphere from istochniyokov of emissions at the gas station, have been executed numerical researches on the COMPUTER.

Numerical modelling was carried out according to the program issledovayony structures of air-gas streams near to the gas station, according to the experiment plan, and also on the basis of a technique of carrying out numerical issledovayonija on the COMPUTER considered in chapter 3.

Following the program of researches, for the analysis and acknowledgement teoretiyocheskoj models (it is offered in chapter 2), allowing to define kontsentrayotsiju harmful substances in a ground layer of atmosphere on different distances from an atmosphere polluter, the situation rasprostrayonenija harmful substances from a respiratory tube of the tank as odinochno a standing polluter of atmosphere in the absence of any zdayony, barriers or obstacles which can affect change struktuyory an airflow (0th town-planning situation) has been simulated.

The values received during experimental researches kontsenyotratsii harmful substances have been put on the schedule of correlation of concentration of harmful substances and distance from a respiratory tube of the gas station, introduced in point 4.1 (drawing 4). Dependence of concentration of steams of gasoline from rasyostojanija to the respiratory tube, received in the different ways (teoreticheyoski, experiment in the aerodynamic chamber and numerical modelling on the COMPUTER), is introduced in drawings 4.

Drawing 4.6 - the correlation Schedule between concentration of harmful substances and distance from a respiratory tube on an axis of a torch of emission (on an axis)

Drawing 4.7 - the correlation Schedule between concentration of harmful substances and distance from a respiratory tube with a deviation from an axis of a torch of emission (on axis Y)

On all schedules high convergence of results that confirms reliability of the offered theoretical researches, and also high accuracy of carrying out experimental and numerical issleyodovany is observed.

In real conditions of an urban environment near to a source zagrjazneyonija atmospheres (gas station) the residential construction, a green planting and other constructions influencing movement of an airflow and rasprostrayonenie of harmful substances that leads to necessity of consideration protective town-planning and architecturally-planirovochnyh actions ranges. For the purpose of a substantiation of actions for decrease in influence of harmful substances, according to the program of research of air-gas streams, it has been simulated seven town-planning situations of a relative positioning of constructions of the gas station and zhiyologo at home. Results of numerical modelling are introduced in a kind riyosunkov on which movement of air-gas streams directly at the gas station and adjoining territory, and also a zone prevysheyonija maximum concentration limit of steams of gasoline is schematically represented.

Gauging has been made for each event kontsenyotratsii gasoline steams in the points specified on the scheme with co-ordinates of a matrix of planning (drawing 3.14). In connection with the received results chislennoyogo modelling and excess of maximum concentration limit of steams of gasoline with leeward storoyony buildings, in some variants of modelling it has been decided to add doyopolnitelnye gauging points on a leeward part of an apartment house (drawing 4.8).

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Drawing 4.8 - the Scheme of gaugings of concentration of steams of gasoline at numerical modelling on the COMPUTER

In drawings 4 results numerical modeliroyovanija distributions of harmful substances from a respiratory tube of the tank of the gas station at a parallel variant of an arrangement rather are introduced movement vozyodushnogo a stream without barriers (1st town-planning situation).

In drawing 4.9 fields of speeds of airflows are introduced.

Drawing 4.9 - Fields of speeds of airflows at modelling on the COMPUTER

1st town-planning situation: and - a side view; - the top view

1 - an apartment house; 2 - operational; 3 - Broadcasting Company with a canopy; 4 - a respiratory tube

It is obvious, that the current of air at gas station and apartment house constructions has difficult character. At a flow of a building of an apartment house the line is observed uslovyonaja has undressed, which divides a zone of an expendable current and the basic stream of an air-gas mixture (drawing 4.9) [119, 123, 129]. In area below a conditional line the expendable current where current lines osrednennogo movements turn out closed is formed; in other words, movement carries tsiryokuljatsionnyj character. It is known, that return speeds of an expendable current decrease with increase in distance from a wall; in that case it is possible to see area of zero speeds round which there is a circulation of particles. This vortical current arises as consequence of interaction of forces turbuyolentnogo abrasions with forces of pressure. Return speeds in a plane osnovayonija barriers are considerable. [133]

The current in an expendable zone has locally nonresistant character, neyosmotrja on the general established character of movement of a free air. Formed whirlwinds break from a surface and departure with a stream, and on their place the new are born. As it is marked in [87, 147], turbulent pereyomeshivanie masses of air in the field of an expendable circulating current with an external stream it is rather insignificant, that influences an agglomeration of harmful substances in vortical zones.

The area of an expendable current is a zone of an aerodynamic shade. It is important to underline, that, despite presence of pulsations, turbulent obyomen with a hazardous environment in this area it appears insufficient. Therefore within an aerodynamic shade contaminated air emission is inadmissible. [91, 92, 133]

Navetrennyj the domestic building corner is a separation critical point, and behind a building the area of a circulating current of the oval form is formed. In drawing 4.10 it is visible, that the given vortical zone promotes increase in concentration of harmful substances alee buildings, what not proyotivorechit the theoretical researches spent in work [129].

Drawing 4.10 - the Zone of excess of maximum concentration limit of steams of gasoline in air at modelling on the COMPUTER of 1st town-planning situation: a side view; the top view; navetrennaja a building part;

Leeward part of a building

Proceeding from drawing 4.10 it is obvious, that gasoline steams, moving from dyhayotelnoj tubes from the gas station tank, "rest" in navetrennuju a part of the house and accumulate before it at height to 15 m. to This phenomenon also sposobstyovuet small vortical area before a building. Airflows, nabeyogajushchie on a building are closer to its upper edge, according to laws aerodinayomiki [119], increase in speed that promotes dispersion vredyonyh substances of the upper part of the house (excess of maximum concentration limit are not present). According to issledoyovanijam [119], at a flow airflows of rectangular buildings form vortical areas and speed of air motion on a surface of a building and from its leeward part (there is a zone aerodinayomicheskoj shades) that has proved to be true and in our researches (drawing 4.9) decreases. Vortical areas behind a building are connected with return air motion to doyomu, that promotes accumulation of steams of gasoline in a leeward part zdayonija. In a zone of an aerodynamic shade there is an excess of maximum concentration limit of steams benyozina.

In table 4.4 magnitude of concentration of steams of gasoline is introduced at a parallel variant of an arrangement of the gas station (without barriers) in points, according to the scheme of gaugings introduced in drawing 4.8.

Table 4.4 - Values of concentration of steams of gasoline from the gas station at the share

rallelnom an arrangement, without barriers (1st town-planning situation)

№ gauging points Concentration of steams of gasoline, mg/m3 № gauging points Concentration of steams of gasoline, mg/m3
1 0,0309 19 101,6227
2 0,0032 20 47,6266
3 3,89∙10-7 21 20,8743
4 0,3681 22 131,0280
5 1,0584 23 50,8051
6 0,0008 24 2,0411
7 0,0063 25 70,0272
8 0,0254 26 20,6977
9 2,97 ∙∣ 0 5 27 1,2895
10 0,6010 28 22,6818

11 0,7863 29 19,1955
12 0,0014 30 13,2922
13 3,0489 31 10,9492
14 6,3872 32 13,6066
15 0,0113 33 37,1606
16 0,2872 34 11,9669
17 0,8794 35 8,5439
18 0,0044 36 5,3937

At such variant of an arrangement of constructions of the gas station we observe neyoblagoprijatnuju a situation near a residential nine-floor building both with navetyorennoj the building sides, and with leeward, that negatively influences ability to live of tenants. The building most part is in a zone prevyyoshenija maximum concentration limit (in tens times). In this connection there is a necessity preduyosmotret actions of town-planning character for decrease rasproyostranenija harmful substances from the gas station on the residential multistory house, variants with an arrangement between the gas station and an apartment house of an artificial barrier in the form of bushes and trees have been for this purpose simulated.

2nd and 3rd town-planning situation. Following the program issledoyovanija, between the gas station and an apartment house on distance of 25 m from a building were raspoyolozheny densely to each other bushes in height of 1,5 m (in the form of a sphere radiuyosom 0,75) (2nd town-planning situation) (drawing 4.11,) and trees in height of 17 m with radius of a crone 10 m (3rd town-planning situation) (fig. 4.11,). Town-planning situations have been simulated according to a technique of carrying out of numerical modelling on the COMPUTER. At modelirovayonii a green planting they can be considered as the impenetrable body close to spherical and ellipsoidalnoj to the form. Results issledovayony are introduced in drawings 4.

Drawing 4.11 - Model of a relative positioning of an apartment house and gas station constructions:

And - with a bush (2nd town-planning situation);

- with trees (3rd town-planning situation);

1 - an apartment house; 2 - operational; 3 - Broadcasting Company with a canopy;

4 - a respiratory tube; 5 - a barrier

In drawing 4.12 fields of speeds of airflows in territory of the gas station and an adjoining apartment house are introduced at presence between them preyograd. At an arrangement of obstacles character dvizheyonija an airflow considerably varies. According to theoretical bases aerodiyonamiki [119, 130], at a flow of additional obstacles the airflow loses a part of the kinetic energy and is strong turbuliziruetsja, that influences distribution of harmful substances.

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With bushes (2nd town-planning situation) with trees (3rd town-planning situation)

Drawing 4.12 - Fields of speeds of airflows at modelling on the COMPUTER: and - a side view; - the top view;

1 - an apartment house; 2 - operational; 3 - Broadcasting Company with a canopy; 4 - a respiratory tube; 5 - a barrier

Drawing 4.13 - the Zone of excess of maximum concentration limit of steams of gasoline in air at

Modelling on the COMPUTER 2nd town-planning situations: a side view; the top view; navetrennaja a building part;

Leeward part of a building

Drawing 4.14 - the Zone of excess of maximum concentration limit of steams of gasoline in air at modelling on the COMPUTER of 3 town-planning situations: a side view; the top view; navetrennaja a building part;

Leeward part of a building

Green planting (trees and bushes) reduces speed gazoyovozdushnogo a stream in a ground layer of atmosphere since create dopolnitelyonuju a roughness on a land surface and consequently, influence on aeroyodinamicheskie characteristics of nearby buildings. The system zeleyonyh plantings allows to organise the best airing of spaces between buildings, protects buildings and sites of territory from strong vetroyovyh streams and serves as additional isolation from a dust and harmful veyoshchestv [73, 129, 132].

Bushes and trees concern air-penetrable barriers. However the airflow tests braking influence from a green planting on distance approximately 10Нзн (Nzn - height green nasazhdeyony). As approaching a green planting speed of a stream with nayovetrennoj the sides gradually decreases. It continues to decrease at passage through a crone and with zavetrennoj the sides of a green planting to distance 3-5Нзн. Then starts to increase and reaches original value on the distance approximately equal 40Нзн. The thickness of a layer in which influence of a green planting on a profile of speed is observed, is equal 2Нзн [46, 123]. In work [73, 129] wind-shelter properties of a strip of the green planting which has been had before multistory buildings were defined. In [129] it has been established, that at a flow the increase in speed of a wind with navetyorennoj both lateral faces and reduction with zavetrennoj occurs a wind of various designs of groups of a green planting, that does not contradict our results received at numerical modelling.

At housing of bushes between an apartment house and the gas station umenshajutyosja vortical areas round a building, speed of an airflow decreases and on a land surface aspires to zero. Vortical areas before kustarniyokami negligible, speed of air motion at their flow usilivayoetsja. The harmful substances allocated from a respiratory tube of the tank, dvizhutsja in an apartment house direction, overcoming a barrier in a kind kustaryonikov (drawing 4.13). Concentration of steams of gasoline before bushes a bottom
kaja and maximum concentration limit does not exceed, it is connected by that bushes range below area of course of steams of gasoline. Having overcome a barrier, gasoline steams "rest" against a building; in connection with reduction of vortical area on sravneyoniju with 1st town-planning situation, concentration of steams of gasoline on a building surface decreases. Excess of maximum concentration limit of steams of gasoline on navetyorennoj building surfaces is observed at height to 5-6 m. Because speed between a building and bushes on a land surface approaches zero, maximum concentration limit excess on a land surface is observed. In connection with whirlwind reduction alee buildings, gasoline steams in a zone aeyorodinamicheskoj shades do not arrive almost, and concentration aspires to nuyolju.

In the presence of trees between the gas station and an apartment house with leeward stoyorony buildings and barriers speed of an airflow decreases. Between a building and trees we observe vortical movement, it is connected by that an airflow, having increased the speed, at a meeting with a barrier (creating thus depression behind a barrier) "rests" in navetrennuju the part of the house and is partially developed in the opposite direction. Alee buildings speed of a wind aspires to zero (calm), produvaemost in a zone of an aerodynamic shade is absent, it is obvious, that behind a building are formed quiescent area. The airflow with gasoline steams, moving from the gas station, rests against crones of trees, falls and moves between trunks. For deyorevjami gasoline steams are picked up by a whirlwind. It is obvious, that a whirlwind core where speed of an airflow very low, it is displaced from an apartment house in this connection the area of excess of maximum concentration limit is displaced from a building more close to trees. The airflow which is flowing round trees from above with high speed, vyhvayotyvaet harmful substances also disseminates them further, and also sposobstvuyoet to their hit in a leeward part of a building. Alee zdayonija air motion almost is absent, in this connection occurs skopleyonie gasoline steams that involves maximum concentration limit excess. The area prevysheyonija from a leeward part of a building makes maximum concentration limit to 20 m.

In table 4.5 results of numerical research are introduced at a parallel arrangement of the gas station concerning an airflow for three town-planning situations: without barriers, in the presence of bushes, at nayolichii trees.

Table 4. 5 - Values of concentration of steams of gasoline depending on housing of obstacles between the gas station (at a parallel arrangement) and

Apartment house

№ gauging points Concentration of steams of gasoline, mg/m3, depending on housing of obstacles between (a town-planning situation)
Without obstacles

(1)

Bushes

(2)

Trees

(3)

1 0,0309 6,11∙10-7 0,0473
2 0,0032 1,26∙10-5 -
3 3,89∙10-7 3,56∙10-8 -
4 0,3681 0,2175 0,1042
5 1,0584 0,0855 -
6 0,0008 5,42∙10-6 -
7 0,0063 1,76∙10-5 19,9763
8 0,0254 2,11∙10-5 -
9 2,97∙10-5 2,05∙10-7 -
10 0,6010 0,3956 143,2230
11 0,7863 0,0002 2,3427
12 0,0014 8,12∙10-6 3,2732
13 3,0489 69,2051 79,7942
14 6,3872 0,5954 109,8512
15 0,0113 1,07∙10-4 16,0874
16 0,2872 0,7416 40,9332
17 0,8794 1,03∙10-4 2,7535
18 0,0044 1,15∙10-5 37,8288
19 101,6227 13,0636 4,1015
20 47,6266 0,2000 4,2734
21 20,8743 0,0059 3,1919
22 131,0280 31,8544 0,2593
23 50,8051 0,3153 0,2622
24 2,0411 0,0030 0,1048
25 70,0272 4,7416 4,1010
26 20,6977 0,0968 3,7896
27 1,2895 0,0028 4,0560
28 22,6818 6,5818 23,3822

29 19,1955 1,0291 7,1778
30 13,2922 0,4662 3,2027
31 10,9492 0,8376 7,6827
32 13,6066 0,9047 12,2494
33 37,1606 0,9329 8,4198
34 11,9669 1,1872 11,4440
35 8,5439 0,4109 5,2926
36 5,3937 0,2525 3,6437

The note: in points 2,3,5,6,8 and 9 there is no possibility to define magnitude of concentration of steams of gasoline because of their hit in a crone of trees. ZnaYOchenija in the "semiboldface" italics - excess of maximum concentration limit of steams of gasoline (PDKm.r. = 5 mg/m3).

The analysis of the results introduced in table 4.5, allows to draw a conclusion, that different character of aerodynamics of airflows, in zavisimoyosti from presence or absence of barriers between a polluter atmoyosfery and a residential construction, influences distribution of harmful substances in okyoruzhajushchej to mediuim and on values of concentration of steams of gasoline from the gas station in the same points. In the presence of obstacles concentration of steams of gasoline voyokrug at home decreases in different degree depending on a town-planning situation (a barrier kind). It is necessary to notice, that change air potoyoka from the gas station to an apartment house and the control of vortical areas round barriers and designs will allow to lower influences of harmful substances from the gas station on prileyogajushchuju territory.

For the purpose of search rational planirovochnyh decisions of housing of constructions in territory of the gas stations promoting change of a direction of movement of airflows, leading to decrease in influence of emissions of harmful substances from the gas station on nearby buildings, other scheme of an arrangement of the gas station concerning an apartment house and a dominating wind has been considered. Gas station constructions have developed concerning a respiratory tube on 90 degrees (a perpendicular variant of an arrangement (drawing 3.1, and drawing 4.15 see). In this variant of an arrangement of constructions of the gas station running streams of a wind at first met on the way operational and Broadcasting Company with a canopy and only after that reached a respiratory tube, having created the additional
Vortical movements of an airflow to a respiratory tube on territoyorii the gas station. Vortical streams promote movement of harmful substances in stoyoronu the gas station, disseminating them over its territory.

Drawing 4.15 - Model of a relative positioning of constructions of the gas station and an apartment house (4th town-planning situation)

1 - an apartment house; 2 - operational; 3 - Broadcasting Company with a canopy; 4 - a respiratory tube

4th town-planning situation. For a perpendicular variant of an arrangement of the gas station concerning an airflow in the absence of barriers numerical modelling according to a technique described above has been spent, under the same boundary conditions. In drawings 4 results of numerical research of influence of harmful substances from sooruzheyony the gas station on an adjoining apartment house are introduced.

Drawing 4.16 - Fields of speeds of airflows at modelling on the COMPUTER of 4th town-planning situation: and - a side view; - the top view;

1 - an apartment house; 2 - operational; 3 - Broadcasting Company with a canopy; 4 - a respiratory tube

From drawings 4 it is visible, that at change of an arrangement of the gas station concerning an apartment house and a dominating wind gas station influence on prileyogajushchuju territory as varies. There is a decrease in concentration of steams of gasoline, excess of maximum concentration limit about a building is not present. This results from the fact that the vortical area of an airflow from a building around a respiratory tube is imposed on the vortical area created by running streams with
Canopy of Broadcasting Company and operational (drawing 4.18), forming return movement vozduyorisunok 4.17 - the Zone of excess of maximum concentration limit of steams of gasoline in air modelling on the COMPUTER of 4th town-planning situation: a side view; the top view; navetrennaja a building part;

Leeward part of a building


Steams of gasoline allocated from a respiratory tube of the tank, at the expense of vortical air motion at first are tightened in gas station territory, dvizhutsja by Broadcasting Company towards the operational. The whirlwind with steams, resting in operational, rises upwards where gasoline steams are picked up potoyokom a wind, moving above operational, and only after that reach an apartment house. All it promotes dispersion of steams of gasoline over territoyoriej the gas station, and magnitude of concentration of harmful substances near an apartment house not -

The considerable.

Fig. 4.18 - Vortical areas near a building and over gas station territory

In table 4.6 comparison of values of concentration of steams of gasoline is introduced at a parallel arrangement of the gas station concerning air poyotoka (1st town-planning situation) and a perpendicular arrangement of the gas station when the air flow at first passes through gas station territory, and then reaches a respiratory tube (4th town-planning situation) (drawing 4.15).

From table 4.6 it is visible, that, having changed position of the gas station from a parallel variant of housing on perpendicular concerning air potoyoka, we observe reduction of concentration of harmful substances and decrease in influence of the gas station by an adjoining apartment house.

Table 4.6 - the Comparative analysis of concentration of steams of gasoline

№ gauging points Concentration of steams of gasoline, mg/m3, depending on varianyotov gas station housings (a town-planning situation)
Parallel, without barriers

(1)

Perpendicular, without barriers

(4)

1 0,0309 0,1933
2 0,0032 0,3047
3 3,89∙10-7 0,0068
4 0,3681 2,2682
5 1,0584 8,3043
6 0,0008 0,2277
7 0,0063 0,0648
8 0,0254 0,1067
9 2,97∙10-5 0,0255
10 0,6010 1,6040
11 0,7863 0,3844
12 0,0014 0,0715
13 3,0489 3,1301
14 6,3872 3,7937
15 0,0113 1,0617
16 0,2872 2,7679
17 0,8794 0,3160
18 0,0044 0,0659
19 101,6227 0,4128
20 47,6266 0,2515
21 20,8743 0,0835
22 131,0280 0,2117
23 50,8051 0,1105
24 2,0411 0,0652
25 70,0272 0,9528
26 20,6977 0,4544
27 1,2895 0,1055
28 22,6818 0,1073
29 19,1955 0,0828
30 13,2922 0,0494
31 10,9492 0,1181
32 13,6066 0,1190
33 37,1606 0,0588
34 11,9669 1,4161
35 8,5439 0,3097
36 5,3937 0,1149

According to the program of research and by analogy with parallel vayoriantom gas station arrangements, for a perpendicular variant of an arrangement of the gas station have been considered events with housing of obstacles between the gas station and an apartment house: bushes in height of 1,5 m (5th town-planning situayotsija), trees in height of 17 m (6th town-planning situation), and also in common trees and bushes (7th town-planning situation). ReYOzultaty modelling in the form of drawings are introduced in the appendix.

It is necessary to notice, that at housing of additional obstacles between the gas station and an apartment house decrease in speed of movement vozyodushnogo a stream is observed (to zero) alee buildings, in area aerodiyonamicheskoj shades the quiescent area is formed. In this connection alee buildings start to collect gasoline steams, and occurs preyovyshenie maximum concentration limit. Before a building area of excess of maximum concentration limit of steams of gasoline otyosutstvuet, it is connected with the advent of an additional whirlwind between a building and a barrier (displaced to a barrier) which takes away harmful substances from navetrennoj the building sides.

Summary results of magnitudes of concentration of harmful substances in points of gaugings for different town-planning situations of housing of the gas station predstavyoleny in table 4.7.

Results of gaugings confirm, that the joint arrangement deyorevev and bushes promotes decrease in concentration harmful veyoshchestv almost in all points of gaugings, in comparison with a variant, when priyosutstvujut only trees. The increase in quantity of numbers of trees and kustaryonikov on a way of movement of an air-gas stream promotes restraint of harmful substances.

Table 4.7 - Values of concentration of steams of gasoline, mg/m3, for different variants of an arrangement of the gas station (a town-planning situation)

№ gauging points Gas station arrangement
The parallel The perpendicular
Without preyograd (1) With kustarniyokami (2) With derevyojami (3) Without preyograd (4) With kustarniyokami (5) With derevjayomi (6) With trees and bushes

(7)

1 0,0309 6,11∙10-7 0,0473 0,1933 0,4819 214,7088 201,4576
2 0,0032 1,26∙10-5 - 0,3047 8,53∙10-5 - -
3 3,89∙10-7 3,56∙10-8 - 0,0068 1,13∙10-5 - -
4 0,3681 0,2175 0,1042 2,2682 0,0003 1,6149 12,5722
5 1,0584 0,0855 - 8,3043 0,0077 - -
6 0,0008 5,42∙10-6 - 0,2277 0,0005 - -
7 0,0063 1,76∙10-5 19,9763 0,0648 0,1452 347,6210 132,2160
8 0,0254 2,11∙10-5 - 0,1067 0,0006 - -
9 2,97∙10-5 2,05∙10-7 - 0,0255 6,75∙10-5 - -
10 0,6010 0,3956 143,2230 1,6040 0,1034 13,5741 4,2163
11 0,7863 0,0002 2,3427 0,3844 0,0011 105,1584 4,9638
12 0,0014 8,12∙10-6 3,2732 0,0715 0,0006 4,6031 0,1649
13 3,0489 69,2051 79,7942 3,1301 0,0320 3,3817 2,9018
14 6,3872 0,5954 109,8512 3,7937 0,0166 25,5704 4,5956
15 0,0113 1,07∙10-4 16,0874 1,0617 0,0054 2,7383 2,7026
16 0,2872 0,7416 40,9332 2,7679 0,0726 48,8195 4,8101
17 0,8794 1,03∙10-4 2,7535 0,3160 0,0034 54,8584 3,7850
18 0,0044 1,15∙10-5 37,8288 0,0659 0,0011 0,4304 0,1605
19 101,6227 13,0636 4,1015 0,4128 0,0429 2,1052 1,2322
20 47,6266 0,2000 4,2734 0,2515 0,0250 0,7924 1,1660
21 20,8743 0,0059 3,1919 0,0835 0,0012 0,2112 0,8438
22 131,0280 31,8544 0,2593 0,2117 0,0003 0,0152 0,0146
23 50,8051 0,3153 0,2622 0,1105 0,0001 0,0297 0,0154
24 2,0411 0,0030 0,1048 0,0652 5,51∙10-5 0,0277 0,0182
25 70,0272 4,7416 4,1010 0,9528 0,0697 4,5745 2,4670
26 20,6977 0,0968 3,7896 0,4544 0,0311 4,8507 4,1731
27 1,2895 0,0028 4,0560 0,1055 0,0009 1,4530 0,9259
28 22,6818 6,5818 23,3822 0,1073 46,9664 59,2640 32,9400
29 19,1955 1,0291 7,1778 0,0828 37,0365 3,0330 2,3437
30 13,2922 0,4662 3,2027 0,0494 8,0200 4,6670 3,6998
31 10,9492 0,8376 7,6827 0,1181 24,9616 85,1700 71,7200
32 13,6066 0,9047 12,2494 0,1190 46,8005 4,9933 4,6208
33 37,1606 0,9329 8,4198 0,0588 19,8536 3,2966 3,4483
34 11,9669 1,1872 11,4440 1,4161 31,6656 93,6640 56,8300
35 8,5439 0,4109 5,2926 0,3097 25,4441 3,9778 3,0841
36 5,3937 0,2525 3,6437 0,1149 7,6853 4,0304 4,1230

The note: in points 2,3,5,6,8 and 9 there is no possibility to define magnitude of concentration of steams of gasoline because of their hit in a crone of trees. ZnaYOchenija in the "semiboldface" italics - excess of maximum concentration limit of steams of gasoline (PDKm.r. = 5 mg/m3).

The analysis of the received results has shown, that change of a direction of an airflow influences magnitude of distribution of harmful substances from the gas station. Therefore for the existing gas stations in line of city building and again under construction it is necessary to provide the actions promoting poyo
vysheniju environmental safety of the city gas stations which in kompleksyonoj to a measure will consider all factors influencing distribution vredyonyh of substances from the gas station (distance, planirovochnye decisions, presence prepjatyostvy, a direction of a wind, the form of a roof operational and a canopy over Broadcasting Company).

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A source: GARMONOV CYRIL VALEREVICH. the TECHNIQUE of the ESTIMATION of ENVIRONMENTAL SAFETY of CITY GASOLINE STATIONS. The dissertation on competition of a scientific degree of a Cand.Tech.Sci. Voronezh - 2019. 2019

More on topic 4.2. Results of numerical modelling of distribution of air-gas streams from the gas station and the analysis of influence of emissions on an adjoining residential construction:

  1. the Program of research of structure of air-gas streams near to the gas station and their influence on district building
  2. CHAPTER 4 RESULTS OF EXPERIMENTAL AND NUMERICAL RESEARCHES ON DISTRIBUTION OF POLLUTANTS TO THE GROUND LAYER OF ATMOSPHERE FROM SOURCES OF EMISSIONS AT THE GAS STATION
  3. Results of numerical modelling of distribution of harmful substances from a respiratory tube of the gas station for various town-planning situations
  4. Mathematical modelling of distribution of aerosols of a dust in a ground layer of atmosphere from sources of emissions at the gas station
  5. Mathematical modelling of distribution of gaseous pollutants in a ground layer of atmosphere from sources of emissions at the gas station
  6. CHAPTER 3 OF THE TECHNIQUE OF EXPERIMENTAL AND NUMERICAL RESEARCHES OF DISTRIBUTION OF POLLUTANTS IN THE GROUND LAYER OF ATMOSPHERE FROM SOURCES OF EMISSIONS AT THE GAS STATION
  7. CHAPTER 2 THEORETICAL PRECONDITIONS OF MAINTENANCE OF EKOYOLOGICHESKY SAFETY OF THE GAS STATION MODELLING AND THE ESTIMATION OF DISTRIBUTION OF POLLUTANTS IN THE GROUND LAYER OF ATMOSPHERE FROM SOURCES OF EMISSIONS
  8. Theoretical preconditions of distribution of pollutants in a ground layer of atmosphere from sources of emissions at the gas station under adverse meteorological conditions
  9. CHAPTER 5 OF THE RECOMMENDATION ABOUT MAINTENANCE OF ENVIRONMENTAL SAFETY OF THE CITY GAS STATIONS ON THE BASIS OF mnogokriterialnogo THE ANALYSIS OF THE FACTORS INFLUENCING DISTRIBUTION OF HARMFUL SUBSTANCES FROM SOURCES OF EMISSIONS
  10. the Example of an estimation of environmental safety of the gas station on a basis mnogokriterialnogo the analysis of factors (for Voronezh)
  11. Technological features of building and gas station exploitation in urban matrix. The analysis of requirements of the specifications and technical documentation on their housing in line of city building
  12. Methods, techniques and models for definition of allocation of harmful substances in environment while in service the gas station
  13. 3.1. The estimation of the damage, put to environment as a result of gas station work
  14. Specification of release height of pollutants from the car exhaust pipe as source of harmful emission at the gas station
  15. 2.2. Working out of the general model of functioning of a distributive network the Tank farm - the gas station