Traffic noise formula (Traffic Noise Overlay) - Revision history

Rudolf@tygron.nl at 14:19, 17 October 2025

2025-10-17T14:19:01Z

← Older revision		Revision as of 14:19, 17 October 2025
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	The calculations for the [[Traffic Noise Overlay]] follow the standard rekenmethode 1 (SRM 1)~~, as described on http://wetten~~.~~overheid.nl/BWBR0031722/2015-07-01#BijlageIII:~~		The calculations for the [[Traffic Noise Overlay]] follow the standard rekenmethode 1 (SRM 1){{ref\|srm1}}.

	<math>LAeq = E + C_o + C_r - D_a - D_l - D_b - D_m</math>		<math>LAeq = E + C_o + C_r - D_a - D_l - D_b - D_m</math>
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	* [[Traffic Noise Overlay]]		* [[Traffic Noise Overlay]]
	\|references=		\|references=
	* The overlay calculations are based on Standard Calculation Method 1 (SRM1) ~~as defined by the dutch government:~~ http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII		<references>
			{{ref\|srm1
			\|name=Standard Calculation Method 1 (SRM1)
			\|author=
			\|page=
			\|source=
			\|link=http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII
			\|lastvisit=
			}}
			</references>
	}}		}}

Frank@tygron.nl: Undo revision 48422 by Frank@tygron.nl (talk)

2022-10-27T14:49:16Z

Undo revision 48422 by Frank@tygron.nl (talk)

← Older revision		Revision as of 14:49, 27 October 2022
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	: <math>h_s</math> = Building datum height (DTM) of the noise source		: <math>h_s</math> = Building datum height (DTM) of the noise source
	: <math>h_c</math> = Building datum height (DTM) of the noise receiving cell.		: <math>h_c</math> = Building datum height (DTM) of the noise receiving cell.

			Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]

	===Acceleration term on intersections===		===Acceleration term on intersections===

Frank@tygron.nl at 14:47, 27 October 2022

2022-10-27T14:47:51Z

← Older revision		Revision as of 14:47, 27 October 2022
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	: <math>h_s</math> = Building datum height (DTM) of the noise source		: <math>h_s</math> = Building datum height (DTM) of the noise source
	: <math>h_c</math> = Building datum height (DTM) of the noise receiving cell.		: <math>h_c</math> = Building datum height (DTM) of the noise receiving cell.

	~~Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]~~

	===Acceleration term on intersections===		===Acceleration term on intersections===

Frank@tygron.nl at 17:10, 2 March 2022

2022-03-02T17:10:51Z

← Older revision		Revision as of 17:10, 2 March 2022
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	: <math>D_l</math> = air reduction (default = XXX dB(A))		: <math>D_l</math> = air reduction (default = XXX dB(A))
	: <math>D_b</math> = surface reduction. This term is not used, and by default 0 dB.		: <math>D_b</math> = surface reduction. This term is not used, and by default 0 dB.
	: <math>D_m</math> = meteorological reduction ~~(default = XXX dB(A))~~		: <math>D_m</math> = calculated meteorological reduction
	: <math>d</math> = distance from the receiver to the source.		: <math>d</math> = distance from the receiver to the source.
	: <math>e</math> = Euler's number, approximated as 2.7182.		: <math>e</math> = Euler's number, approximated as 2.7182.

Frank@tygron.nl at 17:10, 2 March 2022

2022-03-02T17:10:21Z

← Older revision		Revision as of 17:10, 2 March 2022
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	<math>D_l = 0.01 \cdot d^{0.9}</math>		<math>D_l = 0.01 \cdot d^{0.9}</math>

	<math>D_m = max( 0.0, 3.5 \cdot (1.0 - e^{ \frac{-0.04 \cdot d}{h_s + 0.75 + h_c + 0.75}} )</math>		<math>D_m = max( 0.0, 3.5 \cdot (1.0 - e^{ \frac{-0.04 \cdot d}{h_s + 0.75 + h_c + 0.75}}))</math>

Frank@tygron.nl at 17:09, 2 March 2022

2022-03-02T17:09:27Z

← Older revision		Revision as of 17:09, 2 March 2022
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	: <math>LAeq</math> = equivalent noise level (dB(A))		: <math>LAeq</math> = equivalent noise level (dB(A))
	: <math>E</math> = [[Traffic noise formula (Traffic Noise Overlay)#Emission\|calculated emission]]		: <math>E</math> = [[Traffic noise formula (Traffic Noise Overlay)#Emission\|calculated emission]]
	: <math>C_o</math> = [[Traffic noise formula (Traffic Noise Overlay)#acceleration term on intersections]] (default = 0 dB(A))		: <math>C_o</math> = [[Traffic noise formula (Traffic Noise Overlay)#acceleration term on intersections\|acceleration term on intersections]] (default = 0 dB(A))
	: <math>C_r</math> = reflection term. This term is not used, and by default 0 dB.		: <math>C_r</math> = reflection term. This term is not used, and by default 0 dB.
	: <math>D_a</math> = [[Traffic noise formula (Traffic Noise Overlay)#Distance reduction\|distance reduction]]		: <math>D_a</math> = [[Traffic noise formula (Traffic Noise Overlay)#Distance reduction\|distance reduction]]

Frank@tygron.nl at 17:08, 2 March 2022

2022-03-02T17:08:46Z

← Older revision		Revision as of 17:08, 2 March 2022
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	where:		where:
	: <math>LAeq</math> = equivalent noise level (dB(A))		: <math>LAeq</math> = equivalent noise level (dB(A))
	: <math>E</math> = emission		: <math>E</math> = [[Traffic noise formula (Traffic Noise Overlay)#Emission\|calculated emission]]
	: <math>C_o</math> = [[Traffic noise formula (Traffic Noise Overlay)#acceleration term on intersections]] (default = 0 dB(A))		: <math>C_o</math> = [[Traffic noise formula (Traffic Noise Overlay)#acceleration term on intersections]] (default = 0 dB(A))
	: <math>C_r</math> = reflection term. This term is not used, and by default 0 dB.		: <math>C_r</math> = reflection term. This term is not used, and by default 0 dB.

Frank@tygron.nl: /* Emission */

2022-03-02T17:07:49Z

Emission

← Older revision		Revision as of 17:07, 2 March 2022
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	where:		where:
	:<math>E_{c,start}</math> Emission start value. Configurable with model attribute [[Emission start (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]		:<math>E_{c,start}</math> Emission start value. Configurable with model attribute [[Emission start (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
	:<math>E_{~~c_mult~~}</math> Emission factor. Configurable with model attribute [[Emission mult (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]		:<math>E_{c,mult}</math> Emission factor. Configurable with model attribute [[Emission mult (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
	:<math>V_c</math> = The traffic type's speed, configured in roads with Function Value [[Traffic speed (Traffic Noise Overlay)\|TRAFFIC_SPEED]].		:<math>V_c</math> = The traffic type's speed, configured in roads with Function Value [[Traffic speed (Traffic Noise Overlay)\|TRAFFIC_SPEED]].
	:<math>V0_c</math> = The traffic type's reference speed, configured per traffic type using the model attribute [[V0 (Traffic Noise Overlay)\|V0]].		:<math>V0_c</math> = The traffic type's reference speed, configured per traffic type using the model attribute [[V0 (Traffic Noise Overlay)\|V0]].

Frank@tygron.nl: /* Distance reduction */

2022-03-02T17:07:18Z

Distance reduction

@@ Line 35: / Line 35: @@
 where:
-: <math>D_a = distance reduction
+: <math>D_a</math> = distance reduction
 : <math>r</math> = shortest distance between the source and point of evaluation
 [[File:Geluidsoverlast.png|600px]]

Frank@tygron.nl: /* Emission */

2022-03-02T17:07:02Z

Emission

← Older revision		Revision as of 17:07, 2 March 2022
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	Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]		Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]

	~~===Emission===~~
	~~Emission is computed as:~~

	~~<math>E = 10 \cdot log_{10}(10^{\frac{Ec}{10}} + 10^{\frac{Ev}{10}} + 10^{\frac{Et}{10}} + 10^{\frac{Eb}{10}})</math>~~

	~~where:~~
	~~:<math>E</math> = the combined noise emission~~
	~~:<math>Ec</math> = the calculated noise emission for cars~~
	~~:<math>Ev</math> = the calculated noise emission for vans~~
	~~:<math>Et</math> = the calculated noise emission for trucks~~
	~~:<math>Eb</math> = the calculated noise emission for buses~~

	~~The emission per type of traffic is computed similarly, with values specific to the type of traffic. It is calculated as followed for car traffic:~~

	~~<math>Ec = E_{c,start} + E_{c,mult} \cdot log_{10}(\frac {V_c}{V0_c}) + 10 \cdot log_{10}(\frac{Q_c}{V_c}) + \sigma + \tau \cdot log_{10}(\frac{V_c}{V0_c})</math>~~

	~~where:~~
	:<math>E_{c,start}</math> Emission start value. Configurable with model attribute [[Emission start (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
	:<math>E_{c_mult}</math> Emission factor. Configurable with model attribute [[Emission mult (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
	~~:<math>V_c</math> = The traffic type's speed, configured in roads with Function Value [[Traffic speed (Traffic Noise Overlay)\|TRAFFIC_SPEED]].~~
	~~:<math>V0_c</math> = The traffic type's reference speed, configured per traffic type using the model attribute [[V0 (Traffic Noise Overlay)\|V0]].~~
	~~:<math>\sigma</math> = road surface correction value at reference traffic speed. Configurable in roads with Function Value [[Traffic noise sigma (Traffic Noise Overlay)\|TRAFFIC_NOISE_SIGMA]]~~
	:<math>\tau</math> = road surface correction factor per 10 km/hour deviation from reference traffic speed. Configurable in roads with Function Value [[Traffic noise tau (Traffic Noise Overlay)\|TRAFFIC_NOISE_TAU]]

	===Acceleration term on intersections===		===Acceleration term on intersections===