Presentation on theme: "NOISE MAPPING PROCESS Dr Bernadette McKell Hamilton & McGregor."— Presentation transcript:
NOISE MAPPING PROCESS Dr Bernadette McKell Hamilton & McGregor
What We Have Mapped? Agglomerations over 250,000 inhabitants (including industry and ports) All major roads carrying more than 6 million vehicles a year; Major railways with over 60,000 rail passengers a year Major airports with over 50,000 movements per year.
What Have Mapped Within Agglomerations? Industry and ports All roads within agglomerations with flows of 1000 vehicles or more per day (the lower limit is equivalent to 0.35 million passages per annum). Every railway which is likely to produce noise levels of greater than 55 dB L den or 50 dB L night at 4m above ground level (therefore all railways).
Definitions L den : 24-hr L eq calculated for an annual period, weighted for nightand evening. L evening : The A-weighted long-term average sound level as defined in ISO 1996- 2: 1987, determined over all the evening (19:00 – 23:00) periods of a year L night : The A-weighted long-term average sound level as defined in ISO 1996- 2: 1987, determined over all the night (23:00 – 07:00) periods of a year
The logarithmic of L day L evening and L night including penalties for the night and evening periods
Noise Source Methodology RoadCRTN+TRL backend L A18(hr) to L den correction RailwaysCRN + correction to take account of rail/wheel roughness Airport.csv files (CAA for Glasgow, Edinburgh and Aberdeen and Bickerdike Allen for Prestwick) Industrial & Ports European Commission Working Group Assessment of Exposure to Noise (WG-AEN) GPG for Strategic Noise Mapping and the Production of Associated Data on Noise Exposure