Traffic Noise Overlay: Difference between revisions

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[[File:Traffic_Noise-Overlay.jpg|thumb|left|Optional Traffic Noise overlay]]
[[File:Traffic_Noise-Overlay.jpg|thumb|right|Traffic Noise overlay]]
The Traffic Noise Overlay is an [[Grid overlay|overlay]] which displays the impact of traffic noise in DB(A) for the project area. Based on [[Traffic Flow (Overlay)|traffic flow]], distance and several computation parameters a grid is calculated for the project area. Note, this overlay only shows the impact of traffic noise on top of a background value of 48 dB(A). Influence of other sources (e.g. windmills, air traffic, factories, etc) is excluded.<br>
It becomes available for all stakeholders when added to a project.
<br clear=all>


==Calculations==
The Traffic Noise Overlay is a [[Grid Overlay]] which computes the amount of noise in dB(A) for any given location in the [[project]]. The calculation takes into account traffic intensities and a number of environmental- and computation parameters to compute the noise impact. It also takes into account [[Building]]s and [[Elevation model|terrain features]] which would block the transmission of noise.
The calculations follow the standard rekenmethode 1 (SRM 1), as described on [http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII]:


LAeq = E + Co + Cr - Da - Dl - Db - Dm
The Overlay only computes noise from traffic. Although a background noise level can be configured, other sources of noise (such as windmills, air traffic, or factories) are explicitly excluded.
[[File:Traffic_Noise-Overlay-model.png|thumb|left|Traffic Noise Model]]
{{clear}}


where:
==Configuration==
* LAeq: equivalent noise level (dB(A))
{{main|Model attributes (Traffic Noise Overlay)}}
* E: emission
* Co: acceleration term (default = XXX dB(A))
* Cr: reflection term (omitted)
* Da: distance reduction
* Dl: air reduction (default = XXX dB(A))
* Db: surface reduction (default = XXX dB(A))
* Dm: meteorological reduction (default = XXX dB(A))


Default values are taken from InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
The Traffic Noise Overlay has a number of options which allow it to be configured as desired. A [[Traffic Noise Overlay Wizard|configuration wizard]] is available.


===Emission===
The following aspects can be configured:
Emission is computed as:
* Reference speed per vehicle type
* Noise and noise multipliers per vehicle type
* Background noise
* The hour(s) of the day to perform the calculation for


E = 10 * log(10^(Elv/10)+10^(Emv/10)+10^(Ezv/10)
===Traffic===
Traffic intensities for each type of traffic can be based on one of the following:
* The [[Building attributes (Traffic Noise Overlay)|Attributes of roads]] present in the [[project]].
* [[Prequels (Traffic Noise Overlay)|Prequel Overlay]]s which define respective traffic intensities on a grid.


Per vehicle category, the emission is computed as:
The traffic intensities can be defined as either a single value or as 24 hours, with each value corresponding to each hour of the day. The intensity used for the calculation is then defined by the [[Hours (Traffic Noise Overlay)|HOURS model Attribute]].


Em = am + bm * log(m/v0) + 10 * log(Q/vm)+Cw;m
==Calculation==
{{main|Traffic noise formula (Traffic Noise Overlay)}}
The Traffic Noise Overlay performs its calculations based on the [[Model attributes (Traffic Noise Overlay)|Overlay's Attributes]], and the [[Building attributes (Traffic Noise Overlay)|Attributes of roads]] present in the [[project]]. The calculations follow the standard rekenmethode 1 (SRM 1){{ref|srm1}}.


and 
==Results==
The following result types are available as output from the traffic noise calculations:


Cw;m = σm + τm x log(vm/v0,m)
{{result types|suppresscategory=true|allowselflinks=true|
{{:Noise db            result type (Traffic Noise Overlay)}}
{{:Emission            result type (Traffic Noise Overlay)}}
}}


where:
{{article end
|notes=
* The Overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government.{{ref|srm1}}.
|howtos=
* [[How to add and remove an Overlay]]
* [[How to edit an overlay legend]]
* [[How to add a static traffic model]]
* [[How to add a static grid-based traffic model]]
* [[How to add traffic data unaligned with roads]]
* [[How to add a dynamic traffic model]]
|references=
  <references>
    {{ref|srm1
      |name=SRM1
      |author=
      |page=
      |source=Reken- en meetvoorschrift geluid 2012, Bijlage III
      |link=http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII
      |lastvisit=12-02-2022
    }}
  </references>
}}


* m: vehicle category (light weihgt, medium weight and heavy)
{{TrafficNoiseOverlay nav}}
* a and b: factors to be found at InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
{{Overlay nav}}
 
* Cw = road surface correction
* σ = correction factor at reference traffic speed
* τ = correction factor per 10 km/hour deviation from reference traffic speed
 
===Distance reduction===
Distance reduction is computed as:
 
Da = 10 * log(r)
 
where:
* Da: distance reduction
* r: shortest distance between the source and point of evaluation
 
[[File:Geluidsoverlast.png|600px]]
 
==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 wetten.overheid.nl]
 
==How-to's==
* [[How-to add and remove an overlay|Add and remove an overlay]]
* [[How to edit an overlay legend|Edit an overlay legend]]
 
{{Template:Overlay nav}}

Latest revision as of 16:48, 2 February 2024

Traffic Noise overlay

The Traffic Noise Overlay is a Grid Overlay which computes the amount of noise in dB(A) for any given location in the project. The calculation takes into account traffic intensities and a number of environmental- and computation parameters to compute the noise impact. It also takes into account Buildings and terrain features which would block the transmission of noise.

The Overlay only computes noise from traffic. Although a background noise level can be configured, other sources of noise (such as windmills, air traffic, or factories) are explicitly excluded.

Traffic Noise Model

Configuration

Main article: Model attributes (Traffic Noise Overlay)

The Traffic Noise Overlay has a number of options which allow it to be configured as desired. A configuration wizard is available.

The following aspects can be configured:

  • Reference speed per vehicle type
  • Noise and noise multipliers per vehicle type
  • Background noise
  • The hour(s) of the day to perform the calculation for

Traffic

Traffic intensities for each type of traffic can be based on one of the following:

The traffic intensities can be defined as either a single value or as 24 hours, with each value corresponding to each hour of the day. The intensity used for the calculation is then defined by the HOURS model Attribute.

Calculation

Main article: Traffic noise formula (Traffic Noise Overlay)

The Traffic Noise Overlay performs its calculations based on the Overlay's Attributes, and the Attributes of roads present in the project. The calculations follow the standard rekenmethode 1 (SRM 1)[1].

Results

The following result types are available as output from the traffic noise calculations:

Icon Result type Unit Mode Description
NOISE_DB dB The amount of noise in dB experienced at any given location, based on traffic noise and background noise levels.
EMISSION dB The amount of noise in dB emitted by traffic at any given location.

Notes

  • The Overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government.[1].

How-to's

References

  1. ↑ 1.0 1.1 SRM1 ∙ Reken- en meetvoorschrift geluid 2012, Bijlage III ∙ Found at: http://wetten.overheid.nl/BWBR0031722/2015-07-01#BijlageIII ∙ (last visited: 12-02-2022)
Traffic Noise Overlay
Model attributes
V0 • Emission start • Emission mult • Hours • Background db • Cars active • Vans active • Trucks active • Buses active
Traffic features
Num cars • Num vans • Num trucks • Num buses
Prequels
Cars • Vans • Trucks • Buses
Result types
Noise db • Emission


Overlays
Categorization
Grid • Parent • Result Child • Result Parent • Result type
Default
City
Administrative
Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Vacancy
Environmental
Heat Stress • Traffic Density • Traffic Noise • Traffic NO2 • Livability • Aerius
Water
Rainfall • Flooding • Groundwater • Subsidence • Watershed • Waterwijzer
Raster Calculation
Average • Combo • Distance • Sight Distance • Travel Distance
Geo Data
Area • Attribute • GeoTIFF • WCS • WMS • Image
Topography
Digital Surface Model • Digital Terrain Model • Underground • Function • Source
Network
Network Distance • Network Overview • Network Ownership


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