Traffic NO2 formula (Traffic NO2 Overlay) - Revision history

Frank@tygron.nl at 12:31, 1 March 2023

2023-03-01T12:31:39Z

← Older revision		Revision as of 12:31, 1 March 2023
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	where:		where:
	:<math>Cjm[NO_2]</math> = the calculated annual average concentration [μg/m3],		:<math>Cjm[NO_2]</math> = the calculated annual average concentration [μg/m3],
	:<math>Ca,jm[NO_2]</math> = the provided annual average background-concentration (default = 0 [μg/m3]). ''Configured using model attribute [[Base no2 (Traffic Overlay)\|BASE_NO2]].''		:<math>Ca,jm[NO_2]</math> = the provided annual average background-concentration (default = 0 [μg/m3]). ''Configured using model attribute [[Base no2 (Traffic NO2 Overlay)\|BASE_NO2]].''
	:<math>Cb,jm[NO_2]</math> = the calculated annual average traffic contribution to NO2 concentration [μg/m3].		:<math>Cb,jm[NO_2]</math> = the calculated annual average traffic contribution to NO2 concentration [μg/m3].

Frank@tygron.nl at 16:20, 3 March 2022

2022-03-03T16:20:41Z

← Older revision		Revision as of 16:20, 3 March 2022
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	: <math>F_b</math> = Tree factor, value between 1 and 1.5.		: <math>F_b</math> = Tree factor, value between 1 and 1.5.

	Note that this way of calculating the tree factor is more detailed than the suggested calculation of the tree factor: 1, 1.25 or 1.5 and nothing in between.~~<ref>K. van Velze and J. Wesseling, ''Technische beschrijving van~~		Note that this way of calculating the tree factor is more detailed than the suggested calculation of the tree factor: 1, 1.25 or 1.5 and nothing in between.
	~~standaardrekenmethode 1 (SRM-1), paragraph 3.3 Boomfactor'', RIVM Briefrapport 2014-0127, https://www.rivm.nl/bibliotheek/rapporten/2014-0127.pdf</ref>~~

	====Emission numbers====		====Emission numbers====

Frank@tygron.nl: /* Tree Factor */

2022-03-03T09:43:58Z

Tree Factor

← Older revision		Revision as of 09:43, 3 March 2022
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	: <math>F_b</math> = Tree factor, value between 1 and 1.5.		: <math>F_b</math> = Tree factor, value between 1 and 1.5.

	Note that this way of calculating the tree factor is more detailed than the suggested calculation of the tree factor: 1, 1.25 or 1.5 and nothing in between.		Note that this way of calculating the tree factor is more detailed than the suggested calculation of the tree factor: 1, 1.25 or 1.5 and nothing in between.<ref>K. van Velze and J. Wesseling, ''Technische beschrijving van
			standaardrekenmethode 1 (SRM-1), paragraph 3.3 Boomfactor'', RIVM Briefrapport 2014-0127, https://www.rivm.nl/bibliotheek/rapporten/2014-0127.pdf</ref>

	====Emission numbers====		====Emission numbers====

Frank@tygron.nl: /* Contribution NOX */

2022-03-03T09:41:33Z

Contribution NOX

← Older revision		Revision as of 09:41, 3 March 2022
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	The computation of the dilution factor, <math>\theta</math>, is split into two situations. <ref>K. van Velze and J. Wesseling, ''Technische beschrijving van		The computation of the dilution factor, <math>\theta</math>, is split into two situations. <ref>K. van Velze and J. Wesseling, ''Technische beschrijving van
	standaardrekenmethode 1 (SRM-1)'', RIVM Briefrapport 2014-0127, https://www.rivm.nl/bibliotheek/rapporten/2014-0127.pdf</ref>		standaardrekenmethode 1 (SRM-1), paragraph 3.5'', RIVM Briefrapport 2014-0127, https://www.rivm.nl/bibliotheek/rapporten/2014-0127.pdf</ref>

	For surrounding cells within a distance of 30m:		For surrounding cells within a distance of 30m:

Frank@tygron.nl: /* Contribution NOX */

2022-03-03T09:38:10Z

Contribution NOX

← Older revision		Revision as of 09:38, 3 March 2022
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	:<math>F_{meteo}</math> = 5/windspeed. Default value for windspeed is 5 m/s		:<math>F_{meteo}</math> = 5/windspeed. Default value for windspeed is 5 m/s

	The computation of the dilution factor, <math>\theta</math>, is split into two situations.		The computation of the dilution factor, <math>\theta</math>, is split into two situations. <ref>K. van Velze and J. Wesseling, ''Technische beschrijving van
			standaardrekenmethode 1 (SRM-1)'', RIVM Briefrapport 2014-0127, https://www.rivm.nl/bibliotheek/rapporten/2014-0127.pdf</ref>

	For surrounding cells within a distance of 30m:		For surrounding cells within a distance of 30m:

Frank@tygron.nl: /* Tree Factor */

2022-03-03T09:30:59Z

Tree Factor

← Older revision		Revision as of 09:30, 3 March 2022
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	<math>A_t = \pi \cdot \frac{d^2}{A_c}</math>		<math>A_t = \pi \cdot \frac{d^2}{A_c}</math>

	<math>Fb = 1 + \frac{t}{ 2 \cdot A_t}</math>		<math>F_b = 1 + \frac{t}{ 2 \cdot A_t}</math>

	where:		where:
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	: <math>A_t</math> = Search area measured in amount of cells,		: <math>A_t</math> = Search area measured in amount of cells,
	: <math>t</math> = Amount of tree cells within the search distance,		: <math>t</math> = Amount of tree cells within the search distance,
	: <math>Fb</math> = Tree factor, value between 1 and 1.5.		: <math>F_b</math> = Tree factor, value between 1 and 1.5.

	Note that this way of calculating the tree factor is more detailed than the suggested calculation of the tree factor: 1, 1.25 or 1.5 and nothing in between.		Note that this way of calculating the tree factor is more detailed than the suggested calculation of the tree factor: 1, 1.25 or 1.5 and nothing in between.

Frank@tygron.nl: /* Tree Factor */

2022-03-03T09:30:41Z

Tree Factor

← Older revision		Revision as of 09:30, 3 March 2022
Line 71:		Line 71:
	: <math>A_t</math> = Search area measured in amount of cells,		: <math>A_t</math> = Search area measured in amount of cells,
	: <math>t</math> = Amount of tree cells within the search distance,		: <math>t</math> = Amount of tree cells within the search distance,
	: <math>Fb</math> = Tree factor, value between 1 and 1.5,		: <math>Fb</math> = Tree factor, value between 1 and 1.5.

			Note that this way of calculating the tree factor is more detailed than the suggested calculation of the tree factor: 1, 1.25 or 1.5 and nothing in between.

	====Emission numbers====		====Emission numbers====

Frank@tygron.nl: /* Contribution NOX */

2022-03-03T09:29:38Z

Contribution NOX

← Older revision		Revision as of 09:29, 3 March 2022
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	To compute the annual average traffic contribution to NOX, Cb,jm[NOX] [μg/m3], the following formula from SRM1 is applied:		To compute the annual average traffic contribution to NOX, Cb,jm[NOX] [μg/m3], the following formula from SRM1 is applied:

	<math>Cb,jm[NO_x] = Fk \cdot ENO_x \cdot \theta \cdot Fb \cdot ~~Fmeteo~~</math>		<math>Cb,jm[NO_x] = F_k \cdot ENO_x \cdot \theta \cdot F_b \cdot F_{meteo}</math>

	where:		where:
	:<math>Fk</math> = calibration factor [-] (default = 0.62]		:<math>F_k</math> = calibration factor [-] (default = 0.62]
	:<math>ENO_x</math> = emission number NOx [μg/m/s]		:<math>ENO_x</math> = emission number NOx [μg/m/s]
	:<math>\theta</math> = dilution factor [-]		:<math>\theta</math> = dilution factor [-]
	:<math>Fb</math> = tree factor (default = 1)		:<math>F_b</math> = tree factor (default = 1)
	:<math>~~Fmeteo~~</math> = 5/windspeed. Default value for windspeed is 5 m/s		:<math>F_{meteo}</math> = 5/windspeed. Default value for windspeed is 5 m/s

	The computation of the dilution factor, <math>\theta</math>, is split into two situations.		The computation of the dilution factor, <math>\theta</math>, is split into two situations.

Frank@tygron.nl: /* Tree Factor */

2022-03-03T09:00:39Z

Tree Factor

← Older revision		Revision as of 09:00, 3 March 2022
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	====Tree Factor====		====Tree Factor====
	The tree factor is calculated as followed:		The tree factor is calculated as followed:

			<math>A_t = \pi \cdot \frac{d^2}{A_c}</math>

	<math>Fb = 1 + \frac{t}{ 2 \cdot A_t}</math>		<math>Fb = 1 + \frac{t}{ 2 \cdot A_t}</math>

	~~<math>A_t = \pi \cdot \frac{d^2}{A_c}</math>~~

	where:		where:
			: <math>A_c</math> = Grid cell area in square meters.
			: <math>d</math> = Search distance of trees, currently set on 30 meters,
			: <math>A_t</math> = Search area measured in amount of cells,
			: <math>t</math> = Amount of tree cells within the search distance,
	: <math>Fb</math> = Tree factor, value between 1 and 1.5,		: <math>Fb</math> = Tree factor, value between 1 and 1.5,
	~~: <math>t</math> = Amount of tree cells within the search distance,~~
	~~: <math>A_t</math> = Search area measured in amount of cells,~~
	~~: <math>d</math> = Search distance of trees, currently set on 30 meters,~~
	~~: <math>A_c</math> = Grid cell area in square meters.~~

	====Emission numbers====		====Emission numbers====

Frank@tygron.nl: /* Emission numbers */

2022-03-03T08:46:44Z

Emission numbers

← Older revision		Revision as of 08:46, 3 March 2022
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	<math>E_{drive} = (1.0 - j_c) \cdot n_c \cdot E_{c,d} + (1.0 - j_v) \cdot n_v \cdot E_{v,d} + (1.0 - j_t) \cdot n_t \cdot E_{t,d} + (1.0 - j_b ) \cdot n_b \cdot E_{b,d}</math>		<math>E_{drive} = (1.0 - j_c) \cdot n_c \cdot E_{c,d} + (1.0 - j_v) \cdot n_v \cdot E_{v,d} + (1.0 - j_t) \cdot n_t \cdot E_{t,d} + (1.0 - j_b ) \cdot n_b \cdot E_{b,d}</math>

	<math>E_{jam} = (j_c) \cdot n_c \cdot E_{c,j} + j_v \cdot n_v \cdot E_{v,j} + j_t \cdot n_t \cdot E_{t,j} + j_b \cdot b_t \cdot E_{b,j}</math>		<math>E_{jam} = j_c \cdot n_c \cdot E_{c,j} + j_v \cdot n_v \cdot E_{v,j} + j_t \cdot n_t \cdot E_{t,j} + j_b \cdot b_t \cdot E_{b,j}</math>

	<math>E = (E_{drive} + E_{jam} ) \cdot \frac{1000}{(24 \cdot 3600)}</math>		<math>E = (E_{drive} + E_{jam} ) \cdot \frac{1000}{(24 \cdot 3600)}</math>