The European commission has recently published the Draft Directive on the Assessment and Management of Environmental Noise. The commission announces, e.g. in article 1 that intelligent, common, harmonised computation methods with ensured accuracy need to be developed. None of the many existing methods in the Member States satisfies these requirements. The HARMONOISE project intends to develop and validate such methods for the Assessment and Management of Noise from Road and Rail Traffic. The project will build on the most recent scientific achievements in all Member States and will also provide consensus amongst future users throughout the EC. For this purpose the Consortium has a wide international and scientific background. The methods to be provided will be implemented as obligatory under the Directive and will thus find a wide use for purposes of noise planning, mapping, zoning, noise abatement measures and strategies and for compliance checks.
1. To develop methods by which the sound power output and the directivity of sources of road and rail traffic can be described and assessed as an accurate physical quantity which is independent of short distance sound propagation;
2. To establish a better correlation with future legislation on limiting the noise generation;
3. To define the format of databases by which source dependent data and location dependent data can be collected and stored;
4. To define the minimum set of meteorological conditions which are to be distinguished in order to derive the long term average noise indicator Lden for 3 different periods of the day (day, evening, night) with sufficient accuracy;
5. To apply advanced scientific tools to model and describe the sound propagation under these conditions;6. To validate the models against empirical data of the highest level of definition;
7. To integrate the above steps into one system of methods to be applied by users anywhere in the EC.
Prediction methods for environmental noise from road and rail traffic and from industrial sources are available in various EU member states. These methods show many lacunae: some of them cannot produce the harmonised noise indicator Lden; others show insufficiencies in e.g. the separation of source power output and propagation (usually leading to different propagation models for different sources, which can not be justified from a scientific point of view). Complicated propagation conditions (e.g. multiple reflections in built up areas) show low accuracy. The Harmonoise project will collect the empirical data on which the existing methods were based as well as the models themselves and use these as a starting point for improvement and harmonisation. The source description will be based on true physical quantities (sound power level, directivity), independent of the propagation conditions. The range of different operation conditions included in the source data (e.g. driving in urban areas, in hilly areas, on wet road surface) will be expanded and statistics will be included with respect to the occurrence of these conditions. A database structure will be developed which is to contain source related information and geographical information. The sound propagation under a range of meteorological conditions will be modelled for various geographical situations including a range of ground absorption properties. Scientific tools will be applied for this modelling and the data generated will be fed into a propagation database. The models for source and propagation will be integrated and expanded so that multiple paths and multiple reflections can be treated. Empirical data will be collected for long term average noise levels under a range of conditions and for various sources and the results will be used as the reference for validation of the integrated model. Finally, the method will be provided to the member states as a set of definitions and standards.
-Specification of methods to be developed;
Measurement methods for the sound power output of different sources;
Database for source related data;
Meteorological conditions to be distinguished;
Selection of tools for propagation modelling;
Database containing propagation information-Integration of source and propagation data;
Validation of developed models against empirical data;
-Finalised methodology, suitable for implementation in harmonised EU environmental noise policy.
Funding SchemeCSC - Cost-sharing contracts
2508 EE Den Haag
1430 AH Aalsmeer
2628 VK Delft
501 15 Boras
581 95 Linkoeping
RG40 3GA Wokingham, Berkshire