Project
Efficiency of noise barriers under the influence of wind and temperature gradients (ASTRA2002/012)
Funding origin:
Switzerland
STRIA Roadmaps:
Vehicle design and manufacturing (VDM)
Transport mode:
Multimodal
Transport sectors:
Passenger transport
Freight transport
Project website:
Duration:
Start date: 01/12/2002,
End date: 01/12/2007
Status: Finished
Funding details:
Overview
Background & policy context:
The efficiency of noise barriers depends on wind and temperature stratification. Only little is known about the significance of this weather influence. By means of a long-time measurement of the barrier insertion loss and meteorology in one situation and by theoretical investigations the following questions shall be answered:
- Is there a reduced insertion loss of noise barriers in case of downwind conditions or for positive temperature gradients?
- How relevant are the deviations for a yearly average?
- Can a numerical model estimate the deviations?
- Is it possible to extract sensitive regions in Switzerland for which the possible weather influence is strong?
Objectives:
The research project has the following aims:
- For the time period of one year a long-time measurement station is installed in one situation to monitor the shielding effect of a noise barrier in addition to meteorological parameters as temperature and wind speed.
- A statement will be given on how often temperature inversions and downwind situations occur.
- It will be checked to what extent a numerical model can reproduce the results.
Methodology:
The research findings will be developed based on a literature review, using field tests (long-term monitoring station) and by comparison with theoretical models.
At one immission measuring point an acoustic meteorological and long-term monitoring station will be established.
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