4.1.2 - LNIGHT - Night noise level

Version 1.1 by Emily West on 2022/01/06 12:42

4.1.2 - LNIGHT - Night noise level

TopicUrban challengesSub-challenges
Social4 - Public Health and Well-Being4.1 - Acoustics
Description
The LNIGHT is an acoustic indicator for sound environment. LNIGHT is expressed in dB(A) because it is based on a combination of equivalent sound pressure levels Leq,T (energetic summation through logarithmic law), calculated with the A ponderation on night, depending on the sound source emission (i.e. road traffic conditions). The LNIGHT express the average sound pressure level over one night (Night period 22h-6h). This night can be chosen so that it is representative of a longer period — LNIGHT also occurs in the END (Environmental Noise Directive). If used in that context, a yearly average night time level is intended. This is the night time indicator defined in EU-directive 2002/49 and used by WHO (EEA, 2010).
Scale as linked to D2.2 framework
  • National
  • City
  • Neighborhood 
  • Street
  • Household
  • Object
Data source [ link to data framework]
  • Georeferenced data for built-up area: data from OPEN STREET MAP (OSM)
  • Road traffic counts: data from district, city or regional agencies
  • NBS data: qualitative information given by N4C consortium (when different scenarios will be available by other WPs and when additional functionalities will be integrated in numerical software)
Needs
  • Measured LNIGHT (in situ measurements): acoustic acquisition (in dB(A)) on hourly periods (with typically 1 sec sampling rate), gathered on night period
  • Simulated LNIGHT (numerical predictions): acoustic simulation (in dB(A)) on hourly periods (depending on input data, e.g. road traffic characterization, built-up implementation through GIS, etc.), gathered on night period
Expected Outputs
  • Units: Decibels with A ponderation: “dB(A)”
  • Quantitative
Calculation methods
  • Measured LNIGHT (in situ measurements):
  • Simulated LNIGHT (numerical predictions): NMPB2008 or CNOSSOS-EU (see reference pdf document from UN/Ifsttar/LAE/BG)
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  • see additional biblio references in pdf document from UN/Ifsttar/LAE/BG
    • http://noise-planet.org/noisecapture.html
    • http://noise-planet.org/noisemodelling.html